| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Hyun Kwon | 5663 | 55.47% | 2 | 3.57% |
| Sean Anderson | 3162 | 30.97% | 12 | 21.43% |
| Laurent Pinchart | 933 | 9.14% | 16 | 28.57% |
| Anatoliy Klymenko | 236 | 2.31% | 6 | 10.71% |
| Tomi Valkeinen | 106 | 1.04% | 1 | 1.79% |
| Maxime Ripard | 21 | 0.21% | 2 | 3.57% |
| Quanyang Wang | 19 | 0.19% | 1 | 1.79% |
| Stephen Chandler Paul | 19 | 0.19% | 3 | 5.36% |
| Dan Carpenter | 13 | 0.13% | 3 | 5.36% |
| Rohit Visavalia | 7 | 0.07% | 1 | 1.79% |
| Jani Nikula | 6 | 0.06% | 1 | 1.79% |
| Zhang Enpei | 5 | 0.05% | 1 | 1.79% |
| Paul Cercueil | 5 | 0.05% | 1 | 1.79% |
| Thomas Zimmermann | 4 | 0.04% | 1 | 1.79% |
| ruanjinjie | 3 | 0.03% | 1 | 1.79% |
| Randy Dunlap | 3 | 0.03% | 1 | 1.79% |
| Nathan Huckleberry | 2 | 0.02% | 1 | 1.79% |
| Wei Yongjun | 1 | 0.01% | 1 | 1.79% |
| Karol Przybylski | 1 | 0.01% | 1 | 1.79% |
| Total | 10209 | 56 |
// SPDX-License-Identifier: GPL-2.0 /* * ZynqMP DisplayPort Driver * * Copyright (C) 2017 - 2020 Xilinx, Inc. * * Authors: * - Hyun Woo Kwon <hyun.kwon@xilinx.com> * - Laurent Pinchart <laurent.pinchart@ideasonboard.com> */ #include <drm/display/drm_dp_helper.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc.h> #include <drm/drm_device.h> #include <drm/drm_edid.h> #include <drm/drm_fourcc.h> #include <drm/drm_modes.h> #include <drm/drm_of.h> #include <linux/bitfield.h> #include <linux/clk.h> #include <linux/debugfs.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/io.h> #include <linux/media-bus-format.h> #include <linux/module.h> #include <linux/platform_device.h> #include <linux/pm_runtime.h> #include <linux/phy/phy.h> #include <linux/reset.h> #include <linux/slab.h> #include "zynqmp_disp.h" #include "zynqmp_dp.h" #include "zynqmp_dpsub.h" #include "zynqmp_kms.h" static uint zynqmp_dp_aux_timeout_ms = 50; module_param_named(aux_timeout_ms, zynqmp_dp_aux_timeout_ms, uint, 0444); MODULE_PARM_DESC(aux_timeout_ms, "DP aux timeout value in msec (default: 50)"); /* * Some sink requires a delay after power on request */ static uint zynqmp_dp_power_on_delay_ms = 4; module_param_named(power_on_delay_ms, zynqmp_dp_power_on_delay_ms, uint, 0444); MODULE_PARM_DESC(power_on_delay_ms, "DP power on delay in msec (default: 4)"); /* Link configuration registers */ #define ZYNQMP_DP_LINK_BW_SET 0x0 #define ZYNQMP_DP_LANE_COUNT_SET 0x4 #define ZYNQMP_DP_ENHANCED_FRAME_EN 0x8 #define ZYNQMP_DP_TRAINING_PATTERN_SET 0xc #define ZYNQMP_DP_LINK_QUAL_PATTERN_SET 0x10 #define ZYNQMP_DP_SCRAMBLING_DISABLE 0x14 #define ZYNQMP_DP_DOWNSPREAD_CTL 0x18 #define ZYNQMP_DP_SOFTWARE_RESET 0x1c #define ZYNQMP_DP_SOFTWARE_RESET_STREAM1 BIT(0) #define ZYNQMP_DP_SOFTWARE_RESET_STREAM2 BIT(1) #define ZYNQMP_DP_SOFTWARE_RESET_STREAM3 BIT(2) #define ZYNQMP_DP_SOFTWARE_RESET_STREAM4 BIT(3) #define ZYNQMP_DP_SOFTWARE_RESET_AUX BIT(7) #define ZYNQMP_DP_SOFTWARE_RESET_ALL (ZYNQMP_DP_SOFTWARE_RESET_STREAM1 | \ ZYNQMP_DP_SOFTWARE_RESET_STREAM2 | \ ZYNQMP_DP_SOFTWARE_RESET_STREAM3 | \ ZYNQMP_DP_SOFTWARE_RESET_STREAM4 | \ ZYNQMP_DP_SOFTWARE_RESET_AUX) #define ZYNQMP_DP_COMP_PATTERN_80BIT_1 0x20 #define ZYNQMP_DP_COMP_PATTERN_80BIT_2 0x24 #define ZYNQMP_DP_COMP_PATTERN_80BIT_3 0x28 /* Core enable registers */ #define ZYNQMP_DP_TRANSMITTER_ENABLE 0x80 #define ZYNQMP_DP_MAIN_STREAM_ENABLE 0x84 #define ZYNQMP_DP_FORCE_SCRAMBLER_RESET 0xc0 #define ZYNQMP_DP_VERSION 0xf8 #define ZYNQMP_DP_VERSION_MAJOR_MASK GENMASK(31, 24) #define ZYNQMP_DP_VERSION_MAJOR_SHIFT 24 #define ZYNQMP_DP_VERSION_MINOR_MASK GENMASK(23, 16) #define ZYNQMP_DP_VERSION_MINOR_SHIFT 16 #define ZYNQMP_DP_VERSION_REVISION_MASK GENMASK(15, 12) #define ZYNQMP_DP_VERSION_REVISION_SHIFT 12 #define ZYNQMP_DP_VERSION_PATCH_MASK GENMASK(11, 8) #define ZYNQMP_DP_VERSION_PATCH_SHIFT 8 #define ZYNQMP_DP_VERSION_INTERNAL_MASK GENMASK(7, 0) #define ZYNQMP_DP_VERSION_INTERNAL_SHIFT 0 /* Core ID registers */ #define ZYNQMP_DP_CORE_ID 0xfc #define ZYNQMP_DP_CORE_ID_MAJOR_MASK GENMASK(31, 24) #define ZYNQMP_DP_CORE_ID_MAJOR_SHIFT 24 #define ZYNQMP_DP_CORE_ID_MINOR_MASK GENMASK(23, 16) #define ZYNQMP_DP_CORE_ID_MINOR_SHIFT 16 #define ZYNQMP_DP_CORE_ID_REVISION_MASK GENMASK(15, 8) #define ZYNQMP_DP_CORE_ID_REVISION_SHIFT 8 #define ZYNQMP_DP_CORE_ID_DIRECTION GENMASK(1) /* AUX channel interface registers */ #define ZYNQMP_DP_AUX_COMMAND 0x100 #define ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT 8 #define ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY BIT(12) #define ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT 0 #define ZYNQMP_DP_AUX_WRITE_FIFO 0x104 #define ZYNQMP_DP_AUX_ADDRESS 0x108 #define ZYNQMP_DP_AUX_CLK_DIVIDER 0x10c #define ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT 8 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE 0x130 #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD BIT(0) #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST BIT(1) #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY BIT(2) #define ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT BIT(3) #define ZYNQMP_DP_AUX_REPLY_DATA 0x134 #define ZYNQMP_DP_AUX_REPLY_CODE 0x138 #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK (0) #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_NACK BIT(0) #define ZYNQMP_DP_AUX_REPLY_CODE_AUX_DEFER BIT(1) #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK (0) #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_NACK BIT(2) #define ZYNQMP_DP_AUX_REPLY_CODE_I2C_DEFER BIT(3) #define ZYNQMP_DP_AUX_REPLY_COUNT 0x13c #define ZYNQMP_DP_REPLY_DATA_COUNT 0x148 #define ZYNQMP_DP_REPLY_DATA_COUNT_MASK 0xff #define ZYNQMP_DP_INT_STATUS 0x3a0 #define ZYNQMP_DP_INT_MASK 0x3a4 #define ZYNQMP_DP_INT_EN 0x3a8 #define ZYNQMP_DP_INT_DS 0x3ac #define ZYNQMP_DP_INT_HPD_IRQ BIT(0) #define ZYNQMP_DP_INT_HPD_EVENT BIT(1) #define ZYNQMP_DP_INT_REPLY_RECEIVED BIT(2) #define ZYNQMP_DP_INT_REPLY_TIMEOUT BIT(3) #define ZYNQMP_DP_INT_HPD_PULSE_DET BIT(4) #define ZYNQMP_DP_INT_EXT_PKT_TXD BIT(5) #define ZYNQMP_DP_INT_LIV_ABUF_UNDRFLW BIT(12) #define ZYNQMP_DP_INT_VBLANK_START BIT(13) #define ZYNQMP_DP_INT_PIXEL1_MATCH BIT(14) #define ZYNQMP_DP_INT_PIXEL0_MATCH BIT(15) #define ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK 0x3f0000 #define ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK 0xfc00000 #define ZYNQMP_DP_INT_CUST_TS_2 BIT(28) #define ZYNQMP_DP_INT_CUST_TS BIT(29) #define ZYNQMP_DP_INT_EXT_VSYNC_TS BIT(30) #define ZYNQMP_DP_INT_VSYNC_TS BIT(31) #define ZYNQMP_DP_INT_ALL (ZYNQMP_DP_INT_HPD_IRQ | \ ZYNQMP_DP_INT_HPD_EVENT | \ ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK | \ ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) /* Main stream attribute registers */ #define ZYNQMP_DP_MAIN_STREAM_HTOTAL 0x180 #define ZYNQMP_DP_MAIN_STREAM_VTOTAL 0x184 #define ZYNQMP_DP_MAIN_STREAM_POLARITY 0x188 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT 0 #define ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT 1 #define ZYNQMP_DP_MAIN_STREAM_HSWIDTH 0x18c #define ZYNQMP_DP_MAIN_STREAM_VSWIDTH 0x190 #define ZYNQMP_DP_MAIN_STREAM_HRES 0x194 #define ZYNQMP_DP_MAIN_STREAM_VRES 0x198 #define ZYNQMP_DP_MAIN_STREAM_HSTART 0x19c #define ZYNQMP_DP_MAIN_STREAM_VSTART 0x1a0 #define ZYNQMP_DP_MAIN_STREAM_MISC0 0x1a4 #define ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK BIT(0) #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB (0 << 1) #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422 (5 << 1) #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444 (6 << 1) #define ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK (7 << 1) #define ZYNQMP_DP_MAIN_STREAM_MISC0_DYNAMIC_RANGE BIT(3) #define ZYNQMP_DP_MAIN_STREAM_MISC0_YCBCR_COLR BIT(4) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6 (0 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8 (1 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10 (2 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12 (3 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16 (4 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK (7 << 5) #define ZYNQMP_DP_MAIN_STREAM_MISC1 0x1a8 #define ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN BIT(7) #define ZYNQMP_DP_MAIN_STREAM_M_VID 0x1ac #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE 0x1b0 #define ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF 64 #define ZYNQMP_DP_MAIN_STREAM_N_VID 0x1b4 #define ZYNQMP_DP_USER_PIX_WIDTH 0x1b8 #define ZYNQMP_DP_USER_DATA_COUNT_PER_LANE 0x1bc #define ZYNQMP_DP_MIN_BYTES_PER_TU 0x1c4 #define ZYNQMP_DP_FRAC_BYTES_PER_TU 0x1c8 #define ZYNQMP_DP_INIT_WAIT 0x1cc /* PHY configuration and status registers */ #define ZYNQMP_DP_PHY_RESET 0x200 #define ZYNQMP_DP_PHY_RESET_PHY_RESET BIT(0) #define ZYNQMP_DP_PHY_RESET_GTTX_RESET BIT(1) #define ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET BIT(8) #define ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET BIT(9) #define ZYNQMP_DP_PHY_RESET_ALL_RESET (ZYNQMP_DP_PHY_RESET_PHY_RESET | \ ZYNQMP_DP_PHY_RESET_GTTX_RESET | \ ZYNQMP_DP_PHY_RESET_PHY_PMA_RESET | \ ZYNQMP_DP_PHY_RESET_PHY_PCS_RESET) #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_0 0x210 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_1 0x214 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_2 0x218 #define ZYNQMP_DP_PHY_PREEMPHASIS_LANE_3 0x21c #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_0 0x220 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_1 0x224 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_2 0x228 #define ZYNQMP_DP_PHY_VOLTAGE_DIFF_LANE_3 0x22c #define ZYNQMP_DP_PHY_CLOCK_SELECT 0x234 #define ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G 0x1 #define ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G 0x3 #define ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G 0x5 #define ZYNQMP_DP_TX_PHY_POWER_DOWN 0x238 #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_0 BIT(0) #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_1 BIT(1) #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_2 BIT(2) #define ZYNQMP_DP_TX_PHY_POWER_DOWN_LANE_3 BIT(3) #define ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL 0xf #define ZYNQMP_DP_TRANSMIT_PRBS7 0x230 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_0 0x23c #define ZYNQMP_DP_PHY_PRECURSOR_LANE_1 0x240 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_2 0x244 #define ZYNQMP_DP_PHY_PRECURSOR_LANE_3 0x248 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_0 0x24c #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_1 0x250 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_2 0x254 #define ZYNQMP_DP_PHY_POSTCURSOR_LANE_3 0x258 #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 0x24c #define ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_1 0x250 #define ZYNQMP_DP_PHY_STATUS 0x280 #define ZYNQMP_DP_PHY_STATUS_PLL_LOCKED_SHIFT 4 #define ZYNQMP_DP_PHY_STATUS_FPGA_PLL_LOCKED BIT(6) /* Audio registers */ #define ZYNQMP_DP_TX_AUDIO_CONTROL 0x300 #define ZYNQMP_DP_TX_AUDIO_CHANNELS 0x304 #define ZYNQMP_DP_TX_AUDIO_INFO_DATA 0x308 #define ZYNQMP_DP_TX_M_AUD 0x328 #define ZYNQMP_DP_TX_N_AUD 0x32c #define ZYNQMP_DP_TX_AUDIO_EXT_DATA 0x330 #define ZYNQMP_DP_MAX_LANES 2 #define ZYNQMP_MAX_FREQ 3000000 #define DP_REDUCED_BIT_RATE 162000 #define DP_HIGH_BIT_RATE 270000 #define DP_HIGH_BIT_RATE2 540000 #define DP_MAX_TRAINING_TRIES 5 #define DP_V1_2 0x12 /** * struct zynqmp_dp_link_config - Common link config between source and sink * @max_rate: maximum link rate * @max_lanes: maximum number of lanes */ struct zynqmp_dp_link_config { int max_rate; u8 max_lanes; }; /** * struct zynqmp_dp_mode - Configured mode of DisplayPort * @bw_code: code for bandwidth(link rate) * @lane_cnt: number of lanes * @pclock: pixel clock frequency of current mode * @fmt: format identifier string */ struct zynqmp_dp_mode { const char *fmt; int pclock; u8 bw_code; u8 lane_cnt; }; /** * struct zynqmp_dp_config - Configuration of DisplayPort from DTS * @misc0: misc0 configuration (per DP v1.2 spec) * @misc1: misc1 configuration (per DP v1.2 spec) * @bpp: bits per pixel */ struct zynqmp_dp_config { u8 misc0; u8 misc1; u8 bpp; }; /** * enum test_pattern - Test patterns for test testing * @TEST_VIDEO: Use regular video input * @TEST_SYMBOL_ERROR: Symbol error measurement pattern * @TEST_PRBS7: Output of the PRBS7 (x^7 + x^6 + 1) polynomial * @TEST_80BIT_CUSTOM: A custom 80-bit pattern * @TEST_CP2520: HBR2 compliance eye pattern * @TEST_TPS1: Link training symbol pattern TPS1 (/D10.2/) * @TEST_TPS2: Link training symbol pattern TPS2 * @TEST_TPS3: Link training symbol pattern TPS3 (for HBR2) */ enum test_pattern { TEST_VIDEO, TEST_TPS1, TEST_TPS2, TEST_TPS3, TEST_SYMBOL_ERROR, TEST_PRBS7, TEST_80BIT_CUSTOM, TEST_CP2520, }; static const char *const test_pattern_str[] = { [TEST_VIDEO] = "video", [TEST_TPS1] = "tps1", [TEST_TPS2] = "tps2", [TEST_TPS3] = "tps3", [TEST_SYMBOL_ERROR] = "symbol-error", [TEST_PRBS7] = "prbs7", [TEST_80BIT_CUSTOM] = "80bit-custom", [TEST_CP2520] = "cp2520", }; /** * struct zynqmp_dp_test - Configuration for test mode * @pattern: The test pattern * @enhanced: Use enhanced framing * @downspread: Use SSC * @active: Whether test mode is active * @custom: Custom pattern for %TEST_80BIT_CUSTOM * @train_set: Voltage/preemphasis settings * @bw_code: Bandwidth code for the link * @link_cnt: Number of lanes */ struct zynqmp_dp_test { enum test_pattern pattern; bool enhanced, downspread, active; u8 custom[10]; u8 train_set[ZYNQMP_DP_MAX_LANES]; u8 bw_code; u8 link_cnt; }; /** * struct zynqmp_dp_train_set_priv - Private data for train_set debugfs files * @dp: DisplayPort IP core structure * @lane: The lane for this file */ struct zynqmp_dp_train_set_priv { struct zynqmp_dp *dp; int lane; }; /** * struct zynqmp_dp - Xilinx DisplayPort core * @dev: device structure * @dpsub: Display subsystem * @iomem: device I/O memory for register access * @reset: reset controller * @lock: Mutex protecting this struct and register access (but not AUX) * @irq: irq * @bridge: DRM bridge for the DP encoder * @next_bridge: The downstream bridge * @test: Configuration for test mode * @config: IP core configuration from DTS * @aux: aux channel * @aux_done: Completed when we get an AUX reply or timeout * @ignore_aux_errors: If set, AUX errors are suppressed * @phy: PHY handles for DP lanes * @num_lanes: number of enabled phy lanes * @hpd_work: hot plug detection worker * @hpd_irq_work: hot plug detection IRQ worker * @ignore_hpd: If set, HPD events and IRQs are ignored * @status: connection status * @enabled: flag to indicate if the device is enabled * @dpcd: DP configuration data from currently connected sink device * @link_config: common link configuration between IP core and sink device * @mode: current mode between IP core and sink device * @train_set: set of training data * @debugfs_train_set: Debugfs private data for @train_set * * @lock covers the link configuration in this struct and the device's * registers. It does not cover @aux or @ignore_aux_errors. It is not strictly * required for any of the members which are only modified at probe/remove time * (e.g. @dev). */ struct zynqmp_dp { struct drm_dp_aux aux; struct drm_bridge bridge; struct work_struct hpd_work; struct work_struct hpd_irq_work; struct completion aux_done; struct mutex lock; struct drm_bridge *next_bridge; struct device *dev; struct zynqmp_dpsub *dpsub; void __iomem *iomem; struct reset_control *reset; struct phy *phy[ZYNQMP_DP_MAX_LANES]; enum drm_connector_status status; int irq; bool enabled; bool ignore_aux_errors; bool ignore_hpd; struct zynqmp_dp_train_set_priv debugfs_train_set[ZYNQMP_DP_MAX_LANES]; struct zynqmp_dp_mode mode; struct zynqmp_dp_link_config link_config; struct zynqmp_dp_test test; struct zynqmp_dp_config config; u8 dpcd[DP_RECEIVER_CAP_SIZE]; u8 train_set[ZYNQMP_DP_MAX_LANES]; u8 num_lanes; }; static inline struct zynqmp_dp *bridge_to_dp(struct drm_bridge *bridge) { return container_of(bridge, struct zynqmp_dp, bridge); } static void zynqmp_dp_write(struct zynqmp_dp *dp, int offset, u32 val) { writel(val, dp->iomem + offset); } static u32 zynqmp_dp_read(struct zynqmp_dp *dp, int offset) { return readl(dp->iomem + offset); } static void zynqmp_dp_clr(struct zynqmp_dp *dp, int offset, u32 clr) { zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) & ~clr); } static void zynqmp_dp_set(struct zynqmp_dp *dp, int offset, u32 set) { zynqmp_dp_write(dp, offset, zynqmp_dp_read(dp, offset) | set); } /* ----------------------------------------------------------------------------- * PHY Handling */ #define RST_TIMEOUT_MS 1000 static int zynqmp_dp_reset(struct zynqmp_dp *dp, bool assert) { unsigned long timeout; if (assert) reset_control_assert(dp->reset); else reset_control_deassert(dp->reset); /* Wait for the (de)assert to complete. */ timeout = jiffies + msecs_to_jiffies(RST_TIMEOUT_MS); while (!time_after_eq(jiffies, timeout)) { bool status = !!reset_control_status(dp->reset); if (assert == status) return 0; cpu_relax(); } dev_err(dp->dev, "reset %s timeout\n", assert ? "assert" : "deassert"); return -ETIMEDOUT; } /** * zynqmp_dp_phy_init - Initialize the phy * @dp: DisplayPort IP core structure * * Initialize the phy. * * Return: 0 if the phy instances are initialized correctly, or the error code * returned from the callee functions. */ static int zynqmp_dp_phy_init(struct zynqmp_dp *dp) { int ret; int i; for (i = 0; i < dp->num_lanes; i++) { ret = phy_init(dp->phy[i]); if (ret) { dev_err(dp->dev, "failed to init phy lane %d\n", i); return ret; } } zynqmp_dp_clr(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); /* * Power on lanes in reverse order as only lane 0 waits for the PLL to * lock. */ for (i = dp->num_lanes - 1; i >= 0; i--) { ret = phy_power_on(dp->phy[i]); if (ret) { dev_err(dp->dev, "failed to power on phy lane %d\n", i); return ret; } } return 0; } /** * zynqmp_dp_phy_exit - Exit the phy * @dp: DisplayPort IP core structure * * Exit the phy. */ static void zynqmp_dp_phy_exit(struct zynqmp_dp *dp) { unsigned int i; int ret; for (i = 0; i < dp->num_lanes; i++) { ret = phy_power_off(dp->phy[i]); if (ret) dev_err(dp->dev, "failed to power off phy(%d) %d\n", i, ret); } for (i = 0; i < dp->num_lanes; i++) { ret = phy_exit(dp->phy[i]); if (ret) dev_err(dp->dev, "failed to exit phy(%d) %d\n", i, ret); } } /** * zynqmp_dp_phy_probe - Probe the PHYs * @dp: DisplayPort IP core structure * * Probe PHYs for all lanes. Less PHYs may be available than the number of * lanes, which is not considered an error as long as at least one PHY is * found. The caller can check dp->num_lanes to check how many PHYs were found. * * Return: * * 0 - Success * * -ENXIO - No PHY found * * -EPROBE_DEFER - Probe deferral requested * * Other negative value - PHY retrieval failure */ static int zynqmp_dp_phy_probe(struct zynqmp_dp *dp) { unsigned int i; for (i = 0; i < ZYNQMP_DP_MAX_LANES; i++) { char phy_name[16]; struct phy *phy; snprintf(phy_name, sizeof(phy_name), "dp-phy%d", i); phy = devm_phy_get(dp->dev, phy_name); if (IS_ERR(phy)) { switch (PTR_ERR(phy)) { case -ENODEV: if (dp->num_lanes) return 0; dev_err(dp->dev, "no PHY found\n"); return -ENXIO; case -EPROBE_DEFER: return -EPROBE_DEFER; default: dev_err(dp->dev, "failed to get PHY lane %u\n", i); return PTR_ERR(phy); } } dp->phy[i] = phy; dp->num_lanes++; } return 0; } /** * zynqmp_dp_phy_ready - Check if PHY is ready * @dp: DisplayPort IP core structure * * Check if PHY is ready. If PHY is not ready, wait 1ms to check for 100 times. * This amount of delay was suggested by IP designer. * * Return: 0 if PHY is ready, or -ENODEV if PHY is not ready. */ static int zynqmp_dp_phy_ready(struct zynqmp_dp *dp) { u32 i, reg, ready; ready = (1 << dp->num_lanes) - 1; /* Wait for 100 * 1ms. This should be enough time for PHY to be ready */ for (i = 0; ; i++) { reg = zynqmp_dp_read(dp, ZYNQMP_DP_PHY_STATUS); if ((reg & ready) == ready) return 0; if (i == 100) { dev_err(dp->dev, "PHY isn't ready\n"); return -ENODEV; } usleep_range(1000, 1100); } return 0; } /* ----------------------------------------------------------------------------- * DisplayPort Link Training */ /** * zynqmp_dp_max_rate - Calculate and return available max pixel clock * @link_rate: link rate (Kilo-bytes / sec) * @lane_num: number of lanes * @bpp: bits per pixel * * Return: max pixel clock (KHz) supported by current link config. */ static inline int zynqmp_dp_max_rate(int link_rate, u8 lane_num, u8 bpp) { return link_rate * lane_num * 8 / bpp; } /** * zynqmp_dp_mode_configure - Configure the link values * @dp: DisplayPort IP core structure * @pclock: pixel clock for requested display mode * @current_bw: current link rate * * Find the link configuration values, rate and lane count for requested pixel * clock @pclock. The @pclock is stored in the mode to be used in other * functions later. The returned rate is downshifted from the current rate * @current_bw. * * Return: Current link rate code, or -EINVAL. */ static int zynqmp_dp_mode_configure(struct zynqmp_dp *dp, int pclock, u8 current_bw) { int max_rate = dp->link_config.max_rate; u8 bw_code; u8 max_lanes = dp->link_config.max_lanes; u8 max_link_rate_code = drm_dp_link_rate_to_bw_code(max_rate); u8 bpp = dp->config.bpp; u8 lane_cnt; /* Downshift from current bandwidth */ switch (current_bw) { case DP_LINK_BW_5_4: bw_code = DP_LINK_BW_2_7; break; case DP_LINK_BW_2_7: bw_code = DP_LINK_BW_1_62; break; case DP_LINK_BW_1_62: dev_err(dp->dev, "can't downshift. already lowest link rate\n"); return -EINVAL; default: /* If not given, start with max supported */ bw_code = max_link_rate_code; break; } for (lane_cnt = 1; lane_cnt <= max_lanes; lane_cnt <<= 1) { int bw; u32 rate; bw = drm_dp_bw_code_to_link_rate(bw_code); rate = zynqmp_dp_max_rate(bw, lane_cnt, bpp); if (pclock <= rate) { dp->mode.bw_code = bw_code; dp->mode.lane_cnt = lane_cnt; dp->mode.pclock = pclock; return dp->mode.bw_code; } } dev_err(dp->dev, "failed to configure link values\n"); return -EINVAL; } /** * zynqmp_dp_adjust_train - Adjust train values * @dp: DisplayPort IP core structure * @link_status: link status from sink which contains requested training values */ static void zynqmp_dp_adjust_train(struct zynqmp_dp *dp, u8 link_status[DP_LINK_STATUS_SIZE]) { u8 *train_set = dp->train_set; u8 i; for (i = 0; i < dp->mode.lane_cnt; i++) { u8 voltage = drm_dp_get_adjust_request_voltage(link_status, i); u8 preemphasis = drm_dp_get_adjust_request_pre_emphasis(link_status, i); if (voltage >= DP_TRAIN_VOLTAGE_SWING_LEVEL_3) voltage |= DP_TRAIN_MAX_SWING_REACHED; if (preemphasis >= DP_TRAIN_PRE_EMPH_LEVEL_2) preemphasis |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; train_set[i] = voltage | preemphasis; } } /** * zynqmp_dp_update_vs_emph - Update the training values * @dp: DisplayPort IP core structure * @train_set: A set of training values * * Update the training values based on the request from sink. The mapped values * are predefined, and values(vs, pe, pc) are from the device manual. * * Return: 0 if vs and emph are updated successfully, or the error code returned * by drm_dp_dpcd_write(). */ static int zynqmp_dp_update_vs_emph(struct zynqmp_dp *dp, u8 *train_set) { unsigned int i; int ret; ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, train_set, dp->mode.lane_cnt); if (ret < 0) return ret; for (i = 0; i < dp->mode.lane_cnt; i++) { u32 reg = ZYNQMP_DP_SUB_TX_PHY_PRECURSOR_LANE_0 + i * 4; union phy_configure_opts opts = { 0 }; u8 train = train_set[i]; opts.dp.voltage[0] = (train & DP_TRAIN_VOLTAGE_SWING_MASK) >> DP_TRAIN_VOLTAGE_SWING_SHIFT; opts.dp.pre[0] = (train & DP_TRAIN_PRE_EMPHASIS_MASK) >> DP_TRAIN_PRE_EMPHASIS_SHIFT; phy_configure(dp->phy[i], &opts); zynqmp_dp_write(dp, reg, 0x2); } return 0; } /** * zynqmp_dp_link_train_cr - Train clock recovery * @dp: DisplayPort IP core structure * * Return: 0 if clock recovery train is done successfully, or corresponding * error code. */ static int zynqmp_dp_link_train_cr(struct zynqmp_dp *dp) { u8 link_status[DP_LINK_STATUS_SIZE]; u8 lane_cnt = dp->mode.lane_cnt; u8 vs = 0, tries = 0; u16 max_tries, i; bool cr_done; int ret; zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_1); ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); if (ret < 0) return ret; /* * 256 loops should be maximum iterations for 4 lanes and 4 values. * So, This loop should exit before 512 iterations */ for (max_tries = 0; max_tries < 512; max_tries++) { ret = zynqmp_dp_update_vs_emph(dp, dp->train_set); if (ret) return ret; drm_dp_link_train_clock_recovery_delay(&dp->aux, dp->dpcd); ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); if (ret < 0) return ret; cr_done = drm_dp_clock_recovery_ok(link_status, lane_cnt); if (cr_done) break; for (i = 0; i < lane_cnt; i++) if (!(dp->train_set[i] & DP_TRAIN_MAX_SWING_REACHED)) break; if (i == lane_cnt) break; if ((dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == vs) tries++; else tries = 0; if (tries == DP_MAX_TRAINING_TRIES) break; vs = dp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; zynqmp_dp_adjust_train(dp, link_status); } if (!cr_done) return -EIO; return 0; } /** * zynqmp_dp_link_train_ce - Train channel equalization * @dp: DisplayPort IP core structure * * Return: 0 if channel equalization train is done successfully, or * corresponding error code. */ static int zynqmp_dp_link_train_ce(struct zynqmp_dp *dp) { u8 link_status[DP_LINK_STATUS_SIZE]; u8 lane_cnt = dp->mode.lane_cnt; u32 pat, tries; int ret; bool ce_done; if (dp->dpcd[DP_DPCD_REV] >= DP_V1_2 && dp->dpcd[DP_MAX_LANE_COUNT] & DP_TPS3_SUPPORTED) pat = DP_TRAINING_PATTERN_3; else pat = DP_TRAINING_PATTERN_2; zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, pat); ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, pat | DP_LINK_SCRAMBLING_DISABLE); if (ret < 0) return ret; for (tries = 0; tries < DP_MAX_TRAINING_TRIES; tries++) { ret = zynqmp_dp_update_vs_emph(dp, dp->train_set); if (ret) return ret; drm_dp_link_train_channel_eq_delay(&dp->aux, dp->dpcd); ret = drm_dp_dpcd_read_link_status(&dp->aux, link_status); if (ret < 0) return ret; ce_done = drm_dp_channel_eq_ok(link_status, lane_cnt); if (ce_done) break; zynqmp_dp_adjust_train(dp, link_status); } if (!ce_done) return -EIO; return 0; } /** * zynqmp_dp_setup() - Set up major link parameters * @dp: DisplayPort IP core structure * @bw_code: The link bandwidth as a multiple of 270 MHz * @lane_cnt: The number of lanes to use * @enhanced: Use enhanced framing * @downspread: Enable spread-spectrum clocking * * Return: 0 on success, or -errno on failure */ static int zynqmp_dp_setup(struct zynqmp_dp *dp, u8 bw_code, u8 lane_cnt, bool enhanced, bool downspread) { u32 reg; u8 aux_lane_cnt = lane_cnt; int ret; zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt); if (enhanced) { zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1); aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; } if (downspread) { zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 1); drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, DP_SPREAD_AMP_0_5); } else { zynqmp_dp_write(dp, ZYNQMP_DP_DOWNSPREAD_CTL, 0); drm_dp_dpcd_writeb(&dp->aux, DP_DOWNSPREAD_CTRL, 0); } ret = drm_dp_dpcd_writeb(&dp->aux, DP_LANE_COUNT_SET, aux_lane_cnt); if (ret < 0) { dev_err(dp->dev, "failed to set lane count\n"); return ret; } ret = drm_dp_dpcd_writeb(&dp->aux, DP_MAIN_LINK_CHANNEL_CODING_SET, DP_SET_ANSI_8B10B); if (ret < 0) { dev_err(dp->dev, "failed to set ANSI 8B/10B encoding\n"); return ret; } ret = drm_dp_dpcd_writeb(&dp->aux, DP_LINK_BW_SET, bw_code); if (ret < 0) { dev_err(dp->dev, "failed to set DP bandwidth\n"); return ret; } zynqmp_dp_write(dp, ZYNQMP_DP_LINK_BW_SET, bw_code); switch (bw_code) { case DP_LINK_BW_1_62: reg = ZYNQMP_DP_PHY_CLOCK_SELECT_1_62G; break; case DP_LINK_BW_2_7: reg = ZYNQMP_DP_PHY_CLOCK_SELECT_2_70G; break; case DP_LINK_BW_5_4: default: reg = ZYNQMP_DP_PHY_CLOCK_SELECT_5_40G; break; } zynqmp_dp_write(dp, ZYNQMP_DP_PHY_CLOCK_SELECT, reg); return zynqmp_dp_phy_ready(dp); } /** * zynqmp_dp_train - Train the link * @dp: DisplayPort IP core structure * * Return: 0 if all trains are done successfully, or corresponding error code. */ static int zynqmp_dp_train(struct zynqmp_dp *dp) { int ret; ret = zynqmp_dp_setup(dp, dp->mode.bw_code, dp->mode.lane_cnt, drm_dp_enhanced_frame_cap(dp->dpcd), dp->dpcd[DP_MAX_DOWNSPREAD] & DP_MAX_DOWNSPREAD_0_5); if (ret) return ret; zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 1); memset(dp->train_set, 0, sizeof(dp->train_set)); ret = zynqmp_dp_link_train_cr(dp); if (ret) return ret; ret = zynqmp_dp_link_train_ce(dp); if (ret) return ret; ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_DISABLE); if (ret < 0) { dev_err(dp->dev, "failed to disable training pattern\n"); return ret; } zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, DP_TRAINING_PATTERN_DISABLE); zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, 0); return 0; } /** * zynqmp_dp_train_loop - Downshift the link rate during training * @dp: DisplayPort IP core structure * * Train the link by downshifting the link rate if training is not successful. */ static void zynqmp_dp_train_loop(struct zynqmp_dp *dp) { struct zynqmp_dp_mode *mode = &dp->mode; u8 bw = mode->bw_code; int ret; do { if (dp->status == connector_status_disconnected || !dp->enabled) return; ret = zynqmp_dp_train(dp); if (!ret) return; ret = zynqmp_dp_mode_configure(dp, mode->pclock, bw); if (ret < 0) goto err_out; bw = ret; } while (bw >= DP_LINK_BW_1_62); err_out: dev_err(dp->dev, "failed to train the DP link\n"); } /* ----------------------------------------------------------------------------- * DisplayPort AUX */ #define AUX_READ_BIT 0x1 /** * zynqmp_dp_aux_cmd_submit - Submit aux command * @dp: DisplayPort IP core structure * @cmd: aux command * @addr: aux address * @buf: buffer for command data * @bytes: number of bytes for @buf * @reply: reply code to be returned * * Submit an aux command. All aux related commands, native or i2c aux * read/write, are submitted through this function. The function is mapped to * the transfer function of struct drm_dp_aux. This function involves in * multiple register reads/writes, thus synchronization is needed, and it is * done by drm_dp_helper using @hw_mutex. The calling thread goes into sleep * if there's no immediate reply to the command submission. The reply code is * returned at @reply if @reply != NULL. * * Return: 0 if the command is submitted properly, or corresponding error code: * -EBUSY when there is any request already being processed * -ETIMEDOUT when receiving reply is timed out * -EIO when received bytes are less than requested */ static int zynqmp_dp_aux_cmd_submit(struct zynqmp_dp *dp, u32 cmd, u16 addr, u8 *buf, u8 bytes, u8 *reply) { bool is_read = (cmd & AUX_READ_BIT) ? true : false; unsigned long time_left; u32 reg, i; reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) return -EBUSY; reinit_completion(&dp->aux_done); zynqmp_dp_write(dp, ZYNQMP_DP_AUX_ADDRESS, addr); if (!is_read) for (i = 0; i < bytes; i++) zynqmp_dp_write(dp, ZYNQMP_DP_AUX_WRITE_FIFO, buf[i]); reg = cmd << ZYNQMP_DP_AUX_COMMAND_CMD_SHIFT; if (!buf || !bytes) reg |= ZYNQMP_DP_AUX_COMMAND_ADDRESS_ONLY; else reg |= (bytes - 1) << ZYNQMP_DP_AUX_COMMAND_BYTES_SHIFT; zynqmp_dp_write(dp, ZYNQMP_DP_AUX_COMMAND, reg); /* Wait for reply to be delivered upto 2ms */ time_left = wait_for_completion_timeout(&dp->aux_done, msecs_to_jiffies(2)); if (!time_left) return -ETIMEDOUT; reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT) return -ETIMEDOUT; reg = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_CODE); if (reply) *reply = reg; if (is_read && (reg == ZYNQMP_DP_AUX_REPLY_CODE_AUX_ACK || reg == ZYNQMP_DP_AUX_REPLY_CODE_I2C_ACK)) { reg = zynqmp_dp_read(dp, ZYNQMP_DP_REPLY_DATA_COUNT); if ((reg & ZYNQMP_DP_REPLY_DATA_COUNT_MASK) != bytes) return -EIO; for (i = 0; i < bytes; i++) buf[i] = zynqmp_dp_read(dp, ZYNQMP_DP_AUX_REPLY_DATA); } return 0; } static ssize_t zynqmp_dp_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { struct zynqmp_dp *dp = container_of(aux, struct zynqmp_dp, aux); int ret; unsigned int i, iter; /* Number of loops = timeout in msec / aux delay (400 usec) */ iter = zynqmp_dp_aux_timeout_ms * 1000 / 400; iter = iter ? iter : 1; for (i = 0; i < iter; i++) { ret = zynqmp_dp_aux_cmd_submit(dp, msg->request, msg->address, msg->buffer, msg->size, &msg->reply); if (!ret) { dev_vdbg(dp->dev, "aux %d retries\n", i); return msg->size; } if (dp->status == connector_status_disconnected) { dev_dbg(dp->dev, "no connected aux device\n"); if (dp->ignore_aux_errors) goto fake_response; return -ENODEV; } usleep_range(400, 500); } dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret); if (!dp->ignore_aux_errors) return ret; fake_response: msg->reply = DP_AUX_NATIVE_REPLY_ACK; memset(msg->buffer, 0, msg->size); return msg->size; } /** * zynqmp_dp_aux_init - Initialize and register the DP AUX * @dp: DisplayPort IP core structure * * Program the AUX clock divider and filter and register the DP AUX adapter. * * Return: 0 on success, error value otherwise */ static int zynqmp_dp_aux_init(struct zynqmp_dp *dp) { unsigned long rate; unsigned int w; /* * The AUX_SIGNAL_WIDTH_FILTER is the number of APB clock cycles * corresponding to the AUX pulse. Allowable values are 8, 16, 24, 32, * 40 and 48. The AUX pulse width must be between 0.4µs and 0.6µs, * compute the w / 8 value corresponding to 0.4µs rounded up, and make * sure it stays below 0.6µs and within the allowable values. */ rate = clk_get_rate(dp->dpsub->apb_clk); w = DIV_ROUND_UP(4 * rate, 1000 * 1000 * 10 * 8) * 8; if (w > 6 * rate / (1000 * 1000 * 10) || w > 48) { dev_err(dp->dev, "aclk frequency too high\n"); return -EINVAL; } zynqmp_dp_write(dp, ZYNQMP_DP_AUX_CLK_DIVIDER, (w << ZYNQMP_DP_AUX_CLK_DIVIDER_AUX_FILTER_SHIFT) | (rate / (1000 * 1000))); zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_REPLY_RECEIVED | ZYNQMP_DP_INT_REPLY_TIMEOUT); dp->aux.name = "ZynqMP DP AUX"; dp->aux.dev = dp->dev; dp->aux.drm_dev = dp->bridge.dev; dp->aux.transfer = zynqmp_dp_aux_transfer; return drm_dp_aux_register(&dp->aux); } /** * zynqmp_dp_aux_cleanup - Cleanup the DP AUX * @dp: DisplayPort IP core structure * * Unregister the DP AUX adapter. */ static void zynqmp_dp_aux_cleanup(struct zynqmp_dp *dp) { drm_dp_aux_unregister(&dp->aux); zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_REPLY_RECEIVED | ZYNQMP_DP_INT_REPLY_TIMEOUT); } /* ----------------------------------------------------------------------------- * DisplayPort Generic Support */ /** * zynqmp_dp_update_misc - Write the misc registers * @dp: DisplayPort IP core structure * * The misc register values are stored in the structure, and this * function applies the values into the registers. */ static void zynqmp_dp_update_misc(struct zynqmp_dp *dp) { zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC0, dp->config.misc0); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_MISC1, dp->config.misc1); } /** * zynqmp_dp_set_format - Set the input format * @dp: DisplayPort IP core structure * @info: Display info * @format: input format * @bpc: bits per component * * Update misc register values based on input @format and @bpc. * * Return: 0 on success, or -EINVAL. */ static int zynqmp_dp_set_format(struct zynqmp_dp *dp, const struct drm_display_info *info, enum zynqmp_dpsub_format format, unsigned int bpc) { struct zynqmp_dp_config *config = &dp->config; unsigned int num_colors; config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_MASK; config->misc1 &= ~ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; switch (format) { case ZYNQMP_DPSUB_FORMAT_RGB: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_RGB; num_colors = 3; break; case ZYNQMP_DPSUB_FORMAT_YCRCB444: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_444; num_colors = 3; break; case ZYNQMP_DPSUB_FORMAT_YCRCB422: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_COMP_FORMAT_YCRCB_422; num_colors = 2; break; case ZYNQMP_DPSUB_FORMAT_YONLY: config->misc1 |= ZYNQMP_DP_MAIN_STREAM_MISC1_Y_ONLY_EN; num_colors = 1; break; default: dev_err(dp->dev, "Invalid colormetry in DT\n"); return -EINVAL; } if (info && info->bpc && bpc > info->bpc) { dev_warn(dp->dev, "downgrading requested %ubpc to display limit %ubpc\n", bpc, info->bpc); bpc = info->bpc; } config->misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_MASK; switch (bpc) { case 6: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_6; break; case 8: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; break; case 10: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_10; break; case 12: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_12; break; case 16: config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_16; break; default: dev_warn(dp->dev, "Not supported bpc (%u). fall back to 8bpc\n", bpc); config->misc0 |= ZYNQMP_DP_MAIN_STREAM_MISC0_BPC_8; bpc = 8; break; } /* Update the current bpp based on the format. */ config->bpp = bpc * num_colors; return 0; } /** * zynqmp_dp_encoder_mode_set_transfer_unit - Set the transfer unit values * @dp: DisplayPort IP core structure * @mode: requested display mode * * Set the transfer unit, and calculate all transfer unit size related values. * Calculation is based on DP and IP core specification. */ static void zynqmp_dp_encoder_mode_set_transfer_unit(struct zynqmp_dp *dp, const struct drm_display_mode *mode) { u32 tu = ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE_TU_SIZE_DEF; u32 bw, vid_kbytes, avg_bytes_per_tu, init_wait; /* Use the max transfer unit size (default) */ zynqmp_dp_write(dp, ZYNQMP_DP_MSA_TRANSFER_UNIT_SIZE, tu); vid_kbytes = mode->clock * (dp->config.bpp / 8); bw = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); avg_bytes_per_tu = vid_kbytes * tu / (dp->mode.lane_cnt * bw / 1000); zynqmp_dp_write(dp, ZYNQMP_DP_MIN_BYTES_PER_TU, avg_bytes_per_tu / 1000); zynqmp_dp_write(dp, ZYNQMP_DP_FRAC_BYTES_PER_TU, avg_bytes_per_tu % 1000); /* Configure the initial wait cycle based on transfer unit size */ if (tu < (avg_bytes_per_tu / 1000)) init_wait = 0; else if ((avg_bytes_per_tu / 1000) <= 4) init_wait = tu; else init_wait = tu - avg_bytes_per_tu / 1000; zynqmp_dp_write(dp, ZYNQMP_DP_INIT_WAIT, init_wait); } /** * zynqmp_dp_encoder_mode_set_stream - Configure the main stream * @dp: DisplayPort IP core structure * @mode: requested display mode * * Configure the main stream based on the requested mode @mode. Calculation is * based on IP core specification. */ static void zynqmp_dp_encoder_mode_set_stream(struct zynqmp_dp *dp, const struct drm_display_mode *mode) { u8 lane_cnt = dp->mode.lane_cnt; u32 reg, wpl; zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HTOTAL, mode->htotal); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VTOTAL, mode->vtotal); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_POLARITY, (!!(mode->flags & DRM_MODE_FLAG_PVSYNC) << ZYNQMP_DP_MAIN_STREAM_POLARITY_VSYNC_SHIFT) | (!!(mode->flags & DRM_MODE_FLAG_PHSYNC) << ZYNQMP_DP_MAIN_STREAM_POLARITY_HSYNC_SHIFT)); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSWIDTH, mode->hsync_end - mode->hsync_start); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSWIDTH, mode->vsync_end - mode->vsync_start); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HRES, mode->hdisplay); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VRES, mode->vdisplay); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_HSTART, mode->htotal - mode->hsync_start); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_VSTART, mode->vtotal - mode->vsync_start); /* In synchronous mode, set the dividers */ if (dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK) { reg = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_N_VID, reg); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_M_VID, mode->clock); } zynqmp_dp_write(dp, ZYNQMP_DP_USER_PIX_WIDTH, 1); /* Translate to the native 16 bit datapath based on IP core spec */ wpl = (mode->hdisplay * dp->config.bpp + 15) / 16; reg = wpl + wpl % lane_cnt - lane_cnt; zynqmp_dp_write(dp, ZYNQMP_DP_USER_DATA_COUNT_PER_LANE, reg); } /* ----------------------------------------------------------------------------- * Audio */ void zynqmp_dp_audio_set_channels(struct zynqmp_dp *dp, unsigned int num_channels) { zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, num_channels - 1); } void zynqmp_dp_audio_enable(struct zynqmp_dp *dp) { zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); } void zynqmp_dp_audio_disable(struct zynqmp_dp *dp) { zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); } void zynqmp_dp_audio_write_n_m(struct zynqmp_dp *dp) { unsigned int rate; u32 link_rate; if (!(dp->config.misc0 & ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK)) return; link_rate = drm_dp_bw_code_to_link_rate(dp->mode.bw_code); rate = clk_get_rate(dp->dpsub->aud_clk); dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, link_rate); zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000); } /* ----------------------------------------------------------------------------- * DISP Configuration */ /** * zynqmp_dp_disp_connected_live_layer - Return the first connected live layer * @dp: DisplayPort IP core structure * * Return: The first connected live display layer or NULL if none of the live * layers are connected. */ static struct zynqmp_disp_layer * zynqmp_dp_disp_connected_live_layer(struct zynqmp_dp *dp) { if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_VIDEO)) return dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_VID]; else if (dp->dpsub->connected_ports & BIT(ZYNQMP_DPSUB_PORT_LIVE_GFX)) return dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX]; else return NULL; } static void zynqmp_dp_disp_enable(struct zynqmp_dp *dp, struct drm_atomic_state *state) { struct zynqmp_disp_layer *layer; struct drm_bridge_state *bridge_state; u32 bus_fmt; layer = zynqmp_dp_disp_connected_live_layer(dp); if (!layer) return; bridge_state = drm_atomic_get_new_bridge_state(state, &dp->bridge); if (WARN_ON(!bridge_state)) return; bus_fmt = bridge_state->input_bus_cfg.format; zynqmp_disp_layer_set_live_format(layer, bus_fmt); zynqmp_disp_layer_enable(layer); if (layer == dp->dpsub->layers[ZYNQMP_DPSUB_LAYER_GFX]) zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, true, 255); else zynqmp_disp_blend_set_global_alpha(dp->dpsub->disp, false, 0); zynqmp_disp_enable(dp->dpsub->disp); } static void zynqmp_dp_disp_disable(struct zynqmp_dp *dp, struct drm_bridge_state *old_bridge_state) { struct zynqmp_disp_layer *layer; layer = zynqmp_dp_disp_connected_live_layer(dp); if (!layer) return; zynqmp_disp_disable(dp->dpsub->disp); zynqmp_disp_layer_disable(layer); } /* ----------------------------------------------------------------------------- * DRM Bridge */ static int zynqmp_dp_bridge_attach(struct drm_bridge *bridge, struct drm_encoder *encoder, enum drm_bridge_attach_flags flags) { struct zynqmp_dp *dp = bridge_to_dp(bridge); int ret; /* Initialize and register the AUX adapter. */ ret = zynqmp_dp_aux_init(dp); if (ret) { dev_err(dp->dev, "failed to initialize DP aux\n"); return ret; } if (dp->next_bridge) { ret = drm_bridge_attach(encoder, dp->next_bridge, bridge, flags); if (ret < 0) goto error; } /* Now that initialisation is complete, enable interrupts. */ zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL); return 0; error: zynqmp_dp_aux_cleanup(dp); return ret; } static void zynqmp_dp_bridge_detach(struct drm_bridge *bridge) { struct zynqmp_dp *dp = bridge_to_dp(bridge); zynqmp_dp_aux_cleanup(dp); } static enum drm_mode_status zynqmp_dp_bridge_mode_valid(struct drm_bridge *bridge, const struct drm_display_info *info, const struct drm_display_mode *mode) { struct zynqmp_dp *dp = bridge_to_dp(bridge); int rate; if (mode->clock > ZYNQMP_MAX_FREQ) { dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n", mode->name); drm_mode_debug_printmodeline(mode); return MODE_CLOCK_HIGH; } /* Check with link rate and lane count */ scoped_guard(mutex, &dp->lock) rate = zynqmp_dp_max_rate(dp->link_config.max_rate, dp->link_config.max_lanes, dp->config.bpp); if (mode->clock > rate) { dev_dbg(dp->dev, "filtered mode %s for high pixel rate\n", mode->name); drm_mode_debug_printmodeline(mode); return MODE_CLOCK_HIGH; } return MODE_OK; } static void zynqmp_dp_bridge_atomic_enable(struct drm_bridge *bridge, struct drm_atomic_state *state) { struct zynqmp_dp *dp = bridge_to_dp(bridge); const struct drm_crtc_state *crtc_state; const struct drm_display_mode *adjusted_mode; const struct drm_display_mode *mode; struct drm_connector *connector; struct drm_crtc *crtc; unsigned int i; int rate; int ret; pm_runtime_get_sync(dp->dev); guard(mutex)(&dp->lock); zynqmp_dp_disp_enable(dp, state); /* * Retrieve the CRTC mode and adjusted mode. This requires a little * dance to go from the bridge to the encoder, to the connector and to * the CRTC. */ connector = drm_atomic_get_new_connector_for_encoder(state, bridge->encoder); crtc = drm_atomic_get_new_connector_state(state, connector)->crtc; crtc_state = drm_atomic_get_new_crtc_state(state, crtc); adjusted_mode = &crtc_state->adjusted_mode; mode = &crtc_state->mode; zynqmp_dp_set_format(dp, &connector->display_info, ZYNQMP_DPSUB_FORMAT_RGB, 8); /* Check again as bpp or format might have been changed */ rate = zynqmp_dp_max_rate(dp->link_config.max_rate, dp->link_config.max_lanes, dp->config.bpp); if (mode->clock > rate) { dev_err(dp->dev, "mode %s has too high pixel rate\n", mode->name); drm_mode_debug_printmodeline(mode); } /* Configure the mode */ ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0); if (ret < 0) { pm_runtime_put_sync(dp->dev); return; } zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode); zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode); /* Enable the encoder */ dp->enabled = true; zynqmp_dp_update_misc(dp); zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, 0); if (dp->status == connector_status_connected) { for (i = 0; i < 3; i++) { ret = drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D0); if (ret == 1) break; usleep_range(300, 500); } /* Some monitors take time to wake up properly */ msleep(zynqmp_dp_power_on_delay_ms); } if (ret != 1) dev_dbg(dp->dev, "DP aux failed\n"); else zynqmp_dp_train_loop(dp); zynqmp_dp_write(dp, ZYNQMP_DP_SOFTWARE_RESET, ZYNQMP_DP_SOFTWARE_RESET_ALL); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 1); } static void zynqmp_dp_bridge_atomic_disable(struct drm_bridge *bridge, struct drm_atomic_state *state) { struct drm_bridge_state *old_bridge_state = drm_atomic_get_old_bridge_state(state, bridge); struct zynqmp_dp *dp = bridge_to_dp(bridge); mutex_lock(&dp->lock); dp->enabled = false; cancel_work(&dp->hpd_work); zynqmp_dp_write(dp, ZYNQMP_DP_MAIN_STREAM_ENABLE, 0); drm_dp_dpcd_writeb(&dp->aux, DP_SET_POWER, DP_SET_POWER_D3); zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); zynqmp_dp_disp_disable(dp, old_bridge_state); mutex_unlock(&dp->lock); pm_runtime_put_sync(dp->dev); } #define ZYNQMP_DP_MIN_H_BACKPORCH 20 static int zynqmp_dp_bridge_atomic_check(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state) { struct zynqmp_dp *dp = bridge_to_dp(bridge); struct drm_display_mode *mode = &crtc_state->mode; struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; int diff = mode->htotal - mode->hsync_end; /* * ZynqMP DP requires horizontal backporch to be greater than 12. * This limitation may not be compatible with the sink device. */ if (diff < ZYNQMP_DP_MIN_H_BACKPORCH) { int vrefresh = (adjusted_mode->clock * 1000) / (adjusted_mode->vtotal * adjusted_mode->htotal); dev_dbg(dp->dev, "hbackporch adjusted: %d to %d", diff, ZYNQMP_DP_MIN_H_BACKPORCH - diff); diff = ZYNQMP_DP_MIN_H_BACKPORCH - diff; adjusted_mode->htotal += diff; adjusted_mode->clock = adjusted_mode->vtotal * adjusted_mode->htotal * vrefresh / 1000; } return 0; } static enum drm_connector_status __zynqmp_dp_bridge_detect(struct zynqmp_dp *dp) { struct zynqmp_dp_link_config *link_config = &dp->link_config; u32 state, i; int ret; lockdep_assert_held(&dp->lock); /* * This is from heuristic. It takes some delay (ex, 100 ~ 500 msec) to * get the HPD signal with some monitors. */ for (i = 0; i < 10; i++) { state = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) break; msleep(100); } if (state & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_HPD) { ret = drm_dp_dpcd_read(&dp->aux, 0x0, dp->dpcd, sizeof(dp->dpcd)); if (ret < 0) { dev_dbg(dp->dev, "DPCD read failed"); goto disconnected; } link_config->max_rate = min_t(int, drm_dp_max_link_rate(dp->dpcd), DP_HIGH_BIT_RATE2); link_config->max_lanes = min_t(u8, drm_dp_max_lane_count(dp->dpcd), dp->num_lanes); dp->status = connector_status_connected; return connector_status_connected; } disconnected: dp->status = connector_status_disconnected; return connector_status_disconnected; } static enum drm_connector_status zynqmp_dp_bridge_detect(struct drm_bridge *bridge) { struct zynqmp_dp *dp = bridge_to_dp(bridge); guard(mutex)(&dp->lock); return __zynqmp_dp_bridge_detect(dp); } static const struct drm_edid *zynqmp_dp_bridge_edid_read(struct drm_bridge *bridge, struct drm_connector *connector) { struct zynqmp_dp *dp = bridge_to_dp(bridge); return drm_edid_read_ddc(connector, &dp->aux.ddc); } static u32 *zynqmp_dp_bridge_default_bus_fmts(unsigned int *num_input_fmts) { u32 *formats = kzalloc(sizeof(*formats), GFP_KERNEL); if (formats) *formats = MEDIA_BUS_FMT_FIXED; *num_input_fmts = !!formats; return formats; } static u32 * zynqmp_dp_bridge_get_input_bus_fmts(struct drm_bridge *bridge, struct drm_bridge_state *bridge_state, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state, u32 output_fmt, unsigned int *num_input_fmts) { struct zynqmp_dp *dp = bridge_to_dp(bridge); struct zynqmp_disp_layer *layer; layer = zynqmp_dp_disp_connected_live_layer(dp); if (layer) return zynqmp_disp_live_layer_formats(layer, num_input_fmts); else return zynqmp_dp_bridge_default_bus_fmts(num_input_fmts); } /* ----------------------------------------------------------------------------- * debugfs */ /** * zynqmp_dp_set_test_pattern() - Configure the link for a test pattern * @dp: DisplayPort IP core structure * @pattern: The test pattern to configure * @custom: The custom pattern to use if @pattern is %TEST_80BIT_CUSTOM * * Return: 0 on success, or negative errno on (DPCD) failure */ static int zynqmp_dp_set_test_pattern(struct zynqmp_dp *dp, enum test_pattern pattern, u8 *const custom) { bool scramble = false; u32 train_pattern = 0; u32 link_pattern = 0; u8 dpcd_train = 0; u8 dpcd_link = 0; int ret; switch (pattern) { case TEST_TPS1: train_pattern = 1; break; case TEST_TPS2: train_pattern = 2; break; case TEST_TPS3: train_pattern = 3; break; case TEST_SYMBOL_ERROR: scramble = true; link_pattern = DP_PHY_TEST_PATTERN_ERROR_COUNT; break; case TEST_PRBS7: /* We use a dedicated register to enable PRBS7 */ dpcd_link = DP_LINK_QUAL_PATTERN_ERROR_RATE; break; case TEST_80BIT_CUSTOM: { const u8 *p = custom; link_pattern = DP_LINK_QUAL_PATTERN_80BIT_CUSTOM; zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_1, (p[3] << 24) | (p[2] << 16) | (p[1] << 8) | p[0]); zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_2, (p[7] << 24) | (p[6] << 16) | (p[5] << 8) | p[4]); zynqmp_dp_write(dp, ZYNQMP_DP_COMP_PATTERN_80BIT_3, (p[9] << 8) | p[8]); break; } case TEST_CP2520: link_pattern = DP_LINK_QUAL_PATTERN_CP2520_PAT_1; break; default: WARN_ON_ONCE(1); fallthrough; case TEST_VIDEO: scramble = true; } zynqmp_dp_write(dp, ZYNQMP_DP_SCRAMBLING_DISABLE, !scramble); zynqmp_dp_write(dp, ZYNQMP_DP_TRAINING_PATTERN_SET, train_pattern); zynqmp_dp_write(dp, ZYNQMP_DP_LINK_QUAL_PATTERN_SET, link_pattern); zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMIT_PRBS7, pattern == TEST_PRBS7); dpcd_link = dpcd_link ?: link_pattern; dpcd_train = train_pattern; if (!scramble) dpcd_train |= DP_LINK_SCRAMBLING_DISABLE; if (dp->dpcd[DP_DPCD_REV] < 0x12) { if (pattern == TEST_CP2520) dev_warn(dp->dev, "can't set sink link quality pattern to CP2520 for DPCD < r1.2; error counters will be invalid\n"); else dpcd_train |= FIELD_PREP(DP_LINK_QUAL_PATTERN_11_MASK, dpcd_link); } else { u8 dpcd_link_lane[ZYNQMP_DP_MAX_LANES]; memset(dpcd_link_lane, dpcd_link, ZYNQMP_DP_MAX_LANES); ret = drm_dp_dpcd_write(&dp->aux, DP_LINK_QUAL_LANE0_SET, dpcd_link_lane, ZYNQMP_DP_MAX_LANES); if (ret < 0) return ret; } ret = drm_dp_dpcd_writeb(&dp->aux, DP_TRAINING_PATTERN_SET, dpcd_train); return ret < 0 ? ret : 0; } static int zynqmp_dp_test_setup(struct zynqmp_dp *dp) { return zynqmp_dp_setup(dp, dp->test.bw_code, dp->test.link_cnt, dp->test.enhanced, dp->test.downspread); } static ssize_t zynqmp_dp_pattern_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { struct dentry *dentry = file->f_path.dentry; struct zynqmp_dp *dp = file->private_data; char buf[16]; ssize_t ret; ret = debugfs_file_get(dentry); if (unlikely(ret)) return ret; scoped_guard(mutex, &dp->lock) ret = snprintf(buf, sizeof(buf), "%s\n", test_pattern_str[dp->test.pattern]); debugfs_file_put(dentry); return simple_read_from_buffer(user_buf, count, ppos, buf, ret); } static ssize_t zynqmp_dp_pattern_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { struct dentry *dentry = file->f_path.dentry; struct zynqmp_dp *dp = file->private_data; char buf[16]; ssize_t ret; int pattern; ret = debugfs_file_get(dentry); if (unlikely(ret)) return ret; ret = simple_write_to_buffer(buf, sizeof(buf) - 1, ppos, user_buf, count); if (ret < 0) goto out; buf[ret] = '\0'; pattern = sysfs_match_string(test_pattern_str, buf); if (pattern < 0) { ret = -EINVAL; goto out; } mutex_lock(&dp->lock); dp->test.pattern = pattern; if (dp->test.active) ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern, dp->test.custom) ?: ret; mutex_unlock(&dp->lock); out: debugfs_file_put(dentry); return ret; } static const struct file_operations fops_zynqmp_dp_pattern = { .read = zynqmp_dp_pattern_read, .write = zynqmp_dp_pattern_write, .open = simple_open, .llseek = noop_llseek, }; static int zynqmp_dp_enhanced_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->test.enhanced; return 0; } static int zynqmp_dp_enhanced_set(void *data, u64 val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); dp->test.enhanced = val; return dp->test.active ? zynqmp_dp_test_setup(dp) : 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_enhanced, zynqmp_dp_enhanced_get, zynqmp_dp_enhanced_set, "%llu\n"); static int zynqmp_dp_downspread_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->test.downspread; return 0; } static int zynqmp_dp_downspread_set(void *data, u64 val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); dp->test.downspread = val; return dp->test.active ? zynqmp_dp_test_setup(dp) : 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_downspread, zynqmp_dp_downspread_get, zynqmp_dp_downspread_set, "%llu\n"); static int zynqmp_dp_active_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->test.active; return 0; } static int zynqmp_dp_active_set(void *data, u64 val) { struct zynqmp_dp *dp = data; int ret; guard(mutex)(&dp->lock); if (val) { if (val < 2) { ret = zynqmp_dp_test_setup(dp); if (ret) return ret; } ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern, dp->test.custom); if (ret) return ret; ret = zynqmp_dp_update_vs_emph(dp, dp->test.train_set); if (ret) return ret; dp->test.active = true; } else { int err; dp->test.active = false; err = zynqmp_dp_set_test_pattern(dp, TEST_VIDEO, NULL); if (err) dev_warn(dp->dev, "could not clear test pattern: %d\n", err); zynqmp_dp_train_loop(dp); } return 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_active, zynqmp_dp_active_get, zynqmp_dp_active_set, "%llu\n"); static ssize_t zynqmp_dp_custom_read(struct file *file, char __user *user_buf, size_t count, loff_t *ppos) { struct dentry *dentry = file->f_path.dentry; struct zynqmp_dp *dp = file->private_data; ssize_t ret; ret = debugfs_file_get(dentry); if (unlikely(ret)) return ret; mutex_lock(&dp->lock); ret = simple_read_from_buffer(user_buf, count, ppos, &dp->test.custom, sizeof(dp->test.custom)); mutex_unlock(&dp->lock); debugfs_file_put(dentry); return ret; } static ssize_t zynqmp_dp_custom_write(struct file *file, const char __user *user_buf, size_t count, loff_t *ppos) { struct dentry *dentry = file->f_path.dentry; struct zynqmp_dp *dp = file->private_data; ssize_t ret; char buf[sizeof(dp->test.custom)]; ret = debugfs_file_get(dentry); if (unlikely(ret)) return ret; ret = simple_write_to_buffer(buf, sizeof(buf), ppos, user_buf, count); if (ret < 0) goto out; mutex_lock(&dp->lock); memcpy(dp->test.custom, buf, ret); if (dp->test.active) ret = zynqmp_dp_set_test_pattern(dp, dp->test.pattern, dp->test.custom) ?: ret; mutex_unlock(&dp->lock); out: debugfs_file_put(dentry); return ret; } static const struct file_operations fops_zynqmp_dp_custom = { .read = zynqmp_dp_custom_read, .write = zynqmp_dp_custom_write, .open = simple_open, .llseek = noop_llseek, }; static int zynqmp_dp_swing_get(void *data, u64 *val) { struct zynqmp_dp_train_set_priv *priv = data; struct zynqmp_dp *dp = priv->dp; guard(mutex)(&dp->lock); *val = dp->test.train_set[priv->lane] & DP_TRAIN_VOLTAGE_SWING_MASK; return 0; } static int zynqmp_dp_swing_set(void *data, u64 val) { struct zynqmp_dp_train_set_priv *priv = data; struct zynqmp_dp *dp = priv->dp; u8 *train_set = &dp->test.train_set[priv->lane]; if (val > 3) return -EINVAL; guard(mutex)(&dp->lock); *train_set &= ~(DP_TRAIN_MAX_SWING_REACHED | DP_TRAIN_VOLTAGE_SWING_MASK); *train_set |= val; if (val == 3) *train_set |= DP_TRAIN_MAX_SWING_REACHED; if (dp->test.active) return zynqmp_dp_update_vs_emph(dp, dp->test.train_set); return 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_swing, zynqmp_dp_swing_get, zynqmp_dp_swing_set, "%llu\n"); static int zynqmp_dp_preemphasis_get(void *data, u64 *val) { struct zynqmp_dp_train_set_priv *priv = data; struct zynqmp_dp *dp = priv->dp; guard(mutex)(&dp->lock); *val = FIELD_GET(DP_TRAIN_PRE_EMPHASIS_MASK, dp->test.train_set[priv->lane]); return 0; } static int zynqmp_dp_preemphasis_set(void *data, u64 val) { struct zynqmp_dp_train_set_priv *priv = data; struct zynqmp_dp *dp = priv->dp; u8 *train_set = &dp->test.train_set[priv->lane]; if (val > 2) return -EINVAL; guard(mutex)(&dp->lock); *train_set &= ~(DP_TRAIN_MAX_PRE_EMPHASIS_REACHED | DP_TRAIN_PRE_EMPHASIS_MASK); *train_set |= val; if (val == 2) *train_set |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; if (dp->test.active) return zynqmp_dp_update_vs_emph(dp, dp->test.train_set); return 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_preemphasis, zynqmp_dp_preemphasis_get, zynqmp_dp_preemphasis_set, "%llu\n"); static int zynqmp_dp_lanes_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->test.link_cnt; return 0; } static int zynqmp_dp_lanes_set(void *data, u64 val) { struct zynqmp_dp *dp = data; if (val > ZYNQMP_DP_MAX_LANES) return -EINVAL; guard(mutex)(&dp->lock); if (val > dp->num_lanes) return -EINVAL; dp->test.link_cnt = val; return dp->test.active ? zynqmp_dp_test_setup(dp) : 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_lanes, zynqmp_dp_lanes_get, zynqmp_dp_lanes_set, "%llu\n"); static int zynqmp_dp_rate_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = drm_dp_bw_code_to_link_rate(dp->test.bw_code) * 10000ULL; return 0; } static int zynqmp_dp_rate_set(void *data, u64 val) { struct zynqmp_dp *dp = data; int link_rate; u8 bw_code; if (do_div(val, 10000)) return -EINVAL; bw_code = drm_dp_link_rate_to_bw_code(val); link_rate = drm_dp_bw_code_to_link_rate(bw_code); if (val != link_rate) return -EINVAL; if (bw_code != DP_LINK_BW_1_62 && bw_code != DP_LINK_BW_2_7 && bw_code != DP_LINK_BW_5_4) return -EINVAL; guard(mutex)(&dp->lock); dp->test.bw_code = bw_code; return dp->test.active ? zynqmp_dp_test_setup(dp) : 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_rate, zynqmp_dp_rate_get, zynqmp_dp_rate_set, "%llu\n"); static int zynqmp_dp_ignore_aux_errors_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->ignore_aux_errors; return 0; } static int zynqmp_dp_ignore_aux_errors_set(void *data, u64 val) { struct zynqmp_dp *dp = data; if (val != !!val) return -EINVAL; guard(mutex)(&dp->lock); dp->ignore_aux_errors = val; return 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_aux_errors, zynqmp_dp_ignore_aux_errors_get, zynqmp_dp_ignore_aux_errors_set, "%llu\n"); static int zynqmp_dp_ignore_hpd_get(void *data, u64 *val) { struct zynqmp_dp *dp = data; guard(mutex)(&dp->lock); *val = dp->ignore_hpd; return 0; } static int zynqmp_dp_ignore_hpd_set(void *data, u64 val) { struct zynqmp_dp *dp = data; if (val != !!val) return -EINVAL; guard(mutex)(&dp->lock); dp->ignore_hpd = val; return 0; } DEFINE_DEBUGFS_ATTRIBUTE(fops_zynqmp_dp_ignore_hpd, zynqmp_dp_ignore_hpd_get, zynqmp_dp_ignore_hpd_set, "%llu\n"); static void zynqmp_dp_bridge_debugfs_init(struct drm_bridge *bridge, struct dentry *root) { struct zynqmp_dp *dp = bridge_to_dp(bridge); struct dentry *test; int i; dp->test.bw_code = DP_LINK_BW_5_4; dp->test.link_cnt = dp->num_lanes; test = debugfs_create_dir("test", root); #define CREATE_FILE(name) \ debugfs_create_file(#name, 0600, test, dp, &fops_zynqmp_dp_##name) CREATE_FILE(pattern); CREATE_FILE(enhanced); CREATE_FILE(downspread); CREATE_FILE(active); CREATE_FILE(custom); CREATE_FILE(rate); CREATE_FILE(lanes); CREATE_FILE(ignore_aux_errors); CREATE_FILE(ignore_hpd); for (i = 0; i < dp->num_lanes; i++) { static const char fmt[] = "lane%d_preemphasis"; char name[sizeof(fmt)]; dp->debugfs_train_set[i].dp = dp; dp->debugfs_train_set[i].lane = i; snprintf(name, sizeof(name), fmt, i); debugfs_create_file(name, 0600, test, &dp->debugfs_train_set[i], &fops_zynqmp_dp_preemphasis); snprintf(name, sizeof(name), "lane%d_swing", i); debugfs_create_file(name, 0600, test, &dp->debugfs_train_set[i], &fops_zynqmp_dp_swing); } } static const struct drm_bridge_funcs zynqmp_dp_bridge_funcs = { .attach = zynqmp_dp_bridge_attach, .detach = zynqmp_dp_bridge_detach, .mode_valid = zynqmp_dp_bridge_mode_valid, .atomic_enable = zynqmp_dp_bridge_atomic_enable, .atomic_disable = zynqmp_dp_bridge_atomic_disable, .atomic_duplicate_state = drm_atomic_helper_bridge_duplicate_state, .atomic_destroy_state = drm_atomic_helper_bridge_destroy_state, .atomic_reset = drm_atomic_helper_bridge_reset, .atomic_check = zynqmp_dp_bridge_atomic_check, .detect = zynqmp_dp_bridge_detect, .edid_read = zynqmp_dp_bridge_edid_read, .atomic_get_input_bus_fmts = zynqmp_dp_bridge_get_input_bus_fmts, .debugfs_init = zynqmp_dp_bridge_debugfs_init, }; /* ----------------------------------------------------------------------------- * Interrupt Handling */ /** * zynqmp_dp_enable_vblank - Enable vblank * @dp: DisplayPort IP core structure * * Enable vblank interrupt */ void zynqmp_dp_enable_vblank(struct zynqmp_dp *dp) { zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_VBLANK_START); } /** * zynqmp_dp_disable_vblank - Disable vblank * @dp: DisplayPort IP core structure * * Disable vblank interrupt */ void zynqmp_dp_disable_vblank(struct zynqmp_dp *dp) { zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_VBLANK_START); } static void zynqmp_dp_hpd_work_func(struct work_struct *work) { struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp, hpd_work); enum drm_connector_status status; scoped_guard(mutex, &dp->lock) { if (dp->ignore_hpd) return; status = __zynqmp_dp_bridge_detect(dp); } drm_bridge_hpd_notify(&dp->bridge, status); } static void zynqmp_dp_hpd_irq_work_func(struct work_struct *work) { struct zynqmp_dp *dp = container_of(work, struct zynqmp_dp, hpd_irq_work); u8 status[DP_LINK_STATUS_SIZE + 2]; int err; guard(mutex)(&dp->lock); if (dp->ignore_hpd) return; err = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, DP_LINK_STATUS_SIZE + 2); if (err < 0) { dev_dbg_ratelimited(dp->dev, "could not read sink status: %d\n", err); } else { if (status[4] & DP_LINK_STATUS_UPDATED || !drm_dp_clock_recovery_ok(&status[2], dp->mode.lane_cnt) || !drm_dp_channel_eq_ok(&status[2], dp->mode.lane_cnt)) { zynqmp_dp_train_loop(dp); } } } static irqreturn_t zynqmp_dp_irq_handler(int irq, void *data) { struct zynqmp_dp *dp = (struct zynqmp_dp *)data; u32 status, mask; status = zynqmp_dp_read(dp, ZYNQMP_DP_INT_STATUS); /* clear status register as soon as we read it */ zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); /* * Status register may report some events, which corresponding interrupts * have been disabled. Filter out those events against interrupts' mask. */ status &= ~mask; if (!status) return IRQ_NONE; /* dbg for diagnostic, but not much that the driver can do */ if (status & ZYNQMP_DP_INT_CHBUF_UNDERFLW_MASK) dev_dbg_ratelimited(dp->dev, "underflow interrupt\n"); if (status & ZYNQMP_DP_INT_CHBUF_OVERFLW_MASK) dev_dbg_ratelimited(dp->dev, "overflow interrupt\n"); if (status & ZYNQMP_DP_INT_VBLANK_START) zynqmp_dpsub_drm_handle_vblank(dp->dpsub); if (status & ZYNQMP_DP_INT_HPD_EVENT) schedule_work(&dp->hpd_work); if (status & ZYNQMP_DP_INT_HPD_IRQ) schedule_work(&dp->hpd_irq_work); if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) complete(&dp->aux_done); if (status & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT) complete(&dp->aux_done); return IRQ_HANDLED; } /* ----------------------------------------------------------------------------- * Initialization & Cleanup */ int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub) { struct platform_device *pdev = to_platform_device(dpsub->dev); struct drm_bridge *bridge; struct zynqmp_dp *dp; int ret; dp = kzalloc(sizeof(*dp), GFP_KERNEL); if (!dp) return -ENOMEM; dp->dev = &pdev->dev; dp->dpsub = dpsub; dp->status = connector_status_disconnected; mutex_init(&dp->lock); init_completion(&dp->aux_done); INIT_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); INIT_WORK(&dp->hpd_irq_work, zynqmp_dp_hpd_irq_work_func); /* Acquire all resources (IOMEM, IRQ and PHYs). */ dp->iomem = devm_platform_ioremap_resource_byname(pdev, "dp"); if (IS_ERR(dp->iomem)) { ret = PTR_ERR(dp->iomem); goto err_free; } dp->irq = platform_get_irq(pdev, 0); if (dp->irq < 0) { ret = dp->irq; goto err_free; } dp->reset = devm_reset_control_get(dp->dev, NULL); if (IS_ERR(dp->reset)) { ret = dev_err_probe(dp->dev, PTR_ERR(dp->reset), "failed to get reset\n"); goto err_free; } ret = zynqmp_dp_reset(dp, true); if (ret < 0) goto err_free; ret = zynqmp_dp_reset(dp, false); if (ret < 0) goto err_free; ret = zynqmp_dp_phy_probe(dp); if (ret) goto err_reset; /* Initialize the bridge. */ bridge = &dp->bridge; bridge->funcs = &zynqmp_dp_bridge_funcs; bridge->ops = DRM_BRIDGE_OP_DETECT | DRM_BRIDGE_OP_EDID | DRM_BRIDGE_OP_HPD; bridge->type = DRM_MODE_CONNECTOR_DisplayPort; bridge->of_node = dp->dev->of_node; dpsub->bridge = bridge; /* * Acquire the next bridge in the chain. Ignore errors caused by port@5 * not being connected for backward-compatibility with older DTs. */ ret = drm_of_find_panel_or_bridge(dp->dev->of_node, 5, 0, NULL, &dp->next_bridge); if (ret < 0 && ret != -ENODEV) goto err_reset; /* Initialize the hardware. */ dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK; zynqmp_dp_set_format(dp, NULL, ZYNQMP_DPSUB_FORMAT_RGB, 8); zynqmp_dp_write(dp, ZYNQMP_DP_TX_PHY_POWER_DOWN, ZYNQMP_DP_TX_PHY_POWER_DOWN_ALL); zynqmp_dp_set(dp, ZYNQMP_DP_PHY_RESET, ZYNQMP_DP_PHY_RESET_ALL_RESET); zynqmp_dp_write(dp, ZYNQMP_DP_FORCE_SCRAMBLER_RESET, 1); zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); ret = zynqmp_dp_phy_init(dp); if (ret) goto err_reset; zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 1); /* * Now that the hardware is initialized and won't generate spurious * interrupts, request the IRQ. */ ret = devm_request_irq(dp->dev, dp->irq, zynqmp_dp_irq_handler, IRQF_SHARED, dev_name(dp->dev), dp); if (ret < 0) goto err_phy_exit; dpsub->dp = dp; dev_dbg(dp->dev, "ZynqMP DisplayPort Tx probed with %u lanes\n", dp->num_lanes); return 0; err_phy_exit: zynqmp_dp_phy_exit(dp); err_reset: zynqmp_dp_reset(dp, true); err_free: kfree(dp); return ret; } void zynqmp_dp_remove(struct zynqmp_dpsub *dpsub) { struct zynqmp_dp *dp = dpsub->dp; zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, ZYNQMP_DP_INT_ALL); devm_free_irq(dp->dev, dp->irq, dp); cancel_work_sync(&dp->hpd_irq_work); cancel_work_sync(&dp->hpd_work); zynqmp_dp_write(dp, ZYNQMP_DP_TRANSMITTER_ENABLE, 0); zynqmp_dp_write(dp, ZYNQMP_DP_INT_DS, 0xffffffff); zynqmp_dp_phy_exit(dp); zynqmp_dp_reset(dp, true); mutex_destroy(&dp->lock); }
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