| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Hyun Kwon | 6620 | 98.86% | 2 | 18.18% |
| Quanyang Wang | 40 | 0.60% | 1 | 9.09% |
| Stephen Chandler Paul | 20 | 0.30% | 3 | 27.27% |
| Dan Carpenter | 6 | 0.09% | 1 | 9.09% |
| Thomas Zimmermann | 5 | 0.07% | 1 | 9.09% |
| Randy Dunlap | 3 | 0.04% | 1 | 9.09% |
| Colin Ian King | 1 | 0.01% | 1 | 9.09% |
| Wei Yongjun | 1 | 0.01% | 1 | 9.09% |
| Total | 6696 | 11 |
// 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_connector.h> #include <drm/drm_crtc.h> #include <drm/drm_device.h> #include <drm/drm_edid.h> #include <drm/drm_encoder.h> #include <drm/drm_managed.h> #include <drm/drm_modes.h> #include <drm/drm_of.h> #include <drm/drm_probe_helper.h> #include <drm/drm_simple_kms_helper.h> #include <linux/clk.h> #include <linux/delay.h> #include <linux/device.h> #include <linux/io.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 "zynqmp_disp.h" #include "zynqmp_dp.h" #include "zynqmp_dpsub.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_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) /* 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_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 { u8 bw_code; u8 lane_cnt; int pclock; const char *fmt; }; /** * 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; }; /** * struct zynqmp_dp - Xilinx DisplayPort core * @encoder: the drm encoder structure * @connector: the drm connector structure * @dev: device structure * @dpsub: Display subsystem * @drm: DRM core * @iomem: device I/O memory for register access * @reset: reset controller * @irq: irq * @config: IP core configuration from DTS * @aux: aux channel * @phy: PHY handles for DP lanes * @num_lanes: number of enabled phy lanes * @hpd_work: hot plug detection worker * @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 */ struct zynqmp_dp { struct drm_encoder encoder; struct drm_connector connector; struct device *dev; struct zynqmp_dpsub *dpsub; struct drm_device *drm; void __iomem *iomem; struct reset_control *reset; int irq; struct zynqmp_dp_config config; struct drm_dp_aux aux; struct phy *phy[ZYNQMP_DP_MAX_LANES]; u8 num_lanes; struct delayed_work hpd_work; enum drm_connector_status status; bool enabled; u8 dpcd[DP_RECEIVER_CAP_SIZE]; struct zynqmp_dp_link_config link_config; struct zynqmp_dp_mode mode; u8 train_set[ZYNQMP_DP_MAX_LANES]; }; static inline struct zynqmp_dp *encoder_to_dp(struct drm_encoder *encoder) { return container_of(encoder, struct zynqmp_dp, encoder); } static inline struct zynqmp_dp *connector_to_dp(struct drm_connector *connector) { return container_of(connector, struct zynqmp_dp, connector); } 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 voltage = 0, preemphasis = 0; u8 i; for (i = 0; i < dp->mode.lane_cnt; i++) { u8 v = drm_dp_get_adjust_request_voltage(link_status, i); u8 p = drm_dp_get_adjust_request_pre_emphasis(link_status, i); if (v > voltage) voltage = v; if (p > preemphasis) preemphasis = p; } 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; for (i = 0; i < dp->mode.lane_cnt; i++) train_set[i] = voltage | preemphasis; } /** * zynqmp_dp_update_vs_emph - Update the training values * @dp: DisplayPort IP core structure * * 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) { unsigned int i; int ret; ret = drm_dp_dpcd_write(&dp->aux, DP_TRAINING_LANE0_SET, dp->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 = dp->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); 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); 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_link_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) { u32 reg; u8 bw_code = dp->mode.bw_code; u8 lane_cnt = dp->mode.lane_cnt; u8 aux_lane_cnt = lane_cnt; bool enhanced; int ret; zynqmp_dp_write(dp, ZYNQMP_DP_LANE_COUNT_SET, lane_cnt); enhanced = drm_dp_enhanced_frame_cap(dp->dpcd); if (enhanced) { zynqmp_dp_write(dp, ZYNQMP_DP_ENHANCED_FRAME_EN, 1); aux_lane_cnt |= DP_LANE_COUNT_ENHANCED_FRAME_EN; } if (dp->dpcd[3] & 0x1) { 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); ret = zynqmp_dp_phy_ready(dp); if (ret < 0) 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; u32 reg, i; reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REQUEST) return -EBUSY; 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 */ for (i = 0; ; i++) { reg = zynqmp_dp_read(dp, ZYNQMP_DP_INTERRUPT_SIGNAL_STATE); if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY) break; if (reg & ZYNQMP_DP_INTERRUPT_SIGNAL_STATE_REPLY_TIMEOUT || i == 2) return -ETIMEDOUT; usleep_range(1000, 1100); } 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_dbg(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"); return -ENODEV; } usleep_range(400, 500); } dev_dbg(dp->dev, "failed to do aux transfer (%d)\n", ret); return ret; } /** * 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))); dp->aux.name = "ZynqMP DP AUX"; dp->aux.dev = dp->dev; dp->aux.drm_dev = dp->drm; 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); } /* ----------------------------------------------------------------------------- * 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 * @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, enum zynqmp_dpsub_format format, unsigned int bpc) { static const struct drm_display_info *display; 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; } display = &dp->connector.display_info; if (display->bpc && bpc > display->bpc) { dev_warn(dp->dev, "downgrading requested %ubpc to display limit %ubpc\n", bpc, display->bpc); bpc = display->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, 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; unsigned int rate; 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 diviers */ 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); rate = zynqmp_disp_get_audio_clk_rate(dp->dpsub->disp); if (rate) { dev_dbg(dp->dev, "Audio rate: %d\n", rate / 512); zynqmp_dp_write(dp, ZYNQMP_DP_TX_N_AUD, reg); zynqmp_dp_write(dp, ZYNQMP_DP_TX_M_AUD, rate / 1000); } } /* Only 2 channel audio is supported now */ if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CHANNELS, 1); 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); } /* ----------------------------------------------------------------------------- * DRM Connector */ static enum drm_connector_status zynqmp_dp_connector_detect(struct drm_connector *connector, bool force) { struct zynqmp_dp *dp = connector_to_dp(connector); struct zynqmp_dp_link_config *link_config = &dp->link_config; u32 state, i; int ret; /* * 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 int zynqmp_dp_connector_get_modes(struct drm_connector *connector) { struct zynqmp_dp *dp = connector_to_dp(connector); struct edid *edid; int ret; edid = drm_get_edid(connector, &dp->aux.ddc); if (!edid) return 0; drm_connector_update_edid_property(connector, edid); ret = drm_add_edid_modes(connector, edid); kfree(edid); return ret; } static struct drm_encoder * zynqmp_dp_connector_best_encoder(struct drm_connector *connector) { struct zynqmp_dp *dp = connector_to_dp(connector); return &dp->encoder; } static int zynqmp_dp_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { struct zynqmp_dp *dp = connector_to_dp(connector); u8 max_lanes = dp->link_config.max_lanes; u8 bpp = dp->config.bpp; int max_rate = dp->link_config.max_rate; int rate; if (mode->clock > ZYNQMP_MAX_FREQ) { dev_dbg(dp->dev, "filtered the 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 */ rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); if (mode->clock > rate) { dev_dbg(dp->dev, "filtered the mode, %s,for high pixel rate\n", mode->name); drm_mode_debug_printmodeline(mode); return MODE_CLOCK_HIGH; } return MODE_OK; } static const struct drm_connector_funcs zynqmp_dp_connector_funcs = { .detect = zynqmp_dp_connector_detect, .fill_modes = drm_helper_probe_single_connector_modes, .destroy = drm_connector_cleanup, .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, .reset = drm_atomic_helper_connector_reset, }; static const struct drm_connector_helper_funcs zynqmp_dp_connector_helper_funcs = { .get_modes = zynqmp_dp_connector_get_modes, .best_encoder = zynqmp_dp_connector_best_encoder, .mode_valid = zynqmp_dp_connector_mode_valid, }; /* ----------------------------------------------------------------------------- * DRM Encoder */ static void zynqmp_dp_encoder_enable(struct drm_encoder *encoder) { struct zynqmp_dp *dp = encoder_to_dp(encoder); unsigned int i; int ret = 0; pm_runtime_get_sync(dp->dev); dp->enabled = true; zynqmp_dp_update_misc(dp); if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 1); 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_encoder_disable(struct drm_encoder *encoder) { struct zynqmp_dp *dp = encoder_to_dp(encoder); dp->enabled = false; cancel_delayed_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); if (zynqmp_disp_audio_enabled(dp->dpsub->disp)) zynqmp_dp_write(dp, ZYNQMP_DP_TX_AUDIO_CONTROL, 0); pm_runtime_put_sync(dp->dev); } static void zynqmp_dp_encoder_atomic_mode_set(struct drm_encoder *encoder, struct drm_crtc_state *crtc_state, struct drm_connector_state *connector_state) { struct zynqmp_dp *dp = encoder_to_dp(encoder); struct drm_display_mode *mode = &crtc_state->mode; struct drm_display_mode *adjusted_mode = &crtc_state->adjusted_mode; u8 max_lanes = dp->link_config.max_lanes; u8 bpp = dp->config.bpp; int rate, max_rate = dp->link_config.max_rate; int ret; zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); /* Check again as bpp or format might have been chagned */ rate = zynqmp_dp_max_rate(max_rate, max_lanes, bpp); if (mode->clock > rate) { dev_err(dp->dev, "the mode, %s,has too high pixel rate\n", mode->name); drm_mode_debug_printmodeline(mode); } ret = zynqmp_dp_mode_configure(dp, adjusted_mode->clock, 0); if (ret < 0) return; zynqmp_dp_encoder_mode_set_transfer_unit(dp, adjusted_mode); zynqmp_dp_encoder_mode_set_stream(dp, adjusted_mode); } #define ZYNQMP_DP_MIN_H_BACKPORCH 20 static int zynqmp_dp_encoder_atomic_check(struct drm_encoder *encoder, struct drm_crtc_state *crtc_state, struct drm_connector_state *conn_state) { 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(encoder->dev->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 const struct drm_encoder_helper_funcs zynqmp_dp_encoder_helper_funcs = { .enable = zynqmp_dp_encoder_enable, .disable = zynqmp_dp_encoder_disable, .atomic_mode_set = zynqmp_dp_encoder_atomic_mode_set, .atomic_check = zynqmp_dp_encoder_atomic_check, }; /* ----------------------------------------------------------------------------- * 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; dp = container_of(work, struct zynqmp_dp, hpd_work.work); if (dp->drm) drm_helper_hpd_irq_event(dp->drm); } 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); mask = zynqmp_dp_read(dp, ZYNQMP_DP_INT_MASK); if (!(status & ~mask)) 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"); zynqmp_dp_write(dp, ZYNQMP_DP_INT_STATUS, status); if (status & ZYNQMP_DP_INT_VBLANK_START) zynqmp_disp_handle_vblank(dp->dpsub->disp); if (status & ZYNQMP_DP_INT_HPD_EVENT) schedule_delayed_work(&dp->hpd_work, 0); if (status & ZYNQMP_DP_INT_HPD_IRQ) { int ret; u8 status[DP_LINK_STATUS_SIZE + 2]; ret = drm_dp_dpcd_read(&dp->aux, DP_SINK_COUNT, status, DP_LINK_STATUS_SIZE + 2); if (ret < 0) goto handled; 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); } } handled: return IRQ_HANDLED; } /* ----------------------------------------------------------------------------- * Initialization & Cleanup */ int zynqmp_dp_drm_init(struct zynqmp_dpsub *dpsub) { struct zynqmp_dp *dp = dpsub->dp; struct drm_encoder *encoder = &dp->encoder; struct drm_connector *connector = &dp->connector; int ret; dp->config.misc0 &= ~ZYNQMP_DP_MAIN_STREAM_MISC0_SYNC_LOCK; zynqmp_dp_set_format(dp, ZYNQMP_DPSUB_FORMAT_RGB, 8); /* Create the DRM encoder and connector. */ encoder->possible_crtcs |= zynqmp_disp_get_crtc_mask(dpsub->disp); drm_simple_encoder_init(dp->drm, encoder, DRM_MODE_ENCODER_TMDS); drm_encoder_helper_add(encoder, &zynqmp_dp_encoder_helper_funcs); connector->polled = DRM_CONNECTOR_POLL_HPD; ret = drm_connector_init(encoder->dev, connector, &zynqmp_dp_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort); if (ret) { dev_err(dp->dev, "failed to create the DRM connector\n"); return ret; } drm_connector_helper_add(connector, &zynqmp_dp_connector_helper_funcs); drm_connector_register(connector); drm_connector_attach_encoder(connector, encoder); /* 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; } /* Now that initialisation is complete, enable interrupts. */ zynqmp_dp_write(dp, ZYNQMP_DP_INT_EN, ZYNQMP_DP_INT_ALL); return 0; } int zynqmp_dp_probe(struct zynqmp_dpsub *dpsub, struct drm_device *drm) { struct platform_device *pdev = to_platform_device(dpsub->dev); struct zynqmp_dp *dp; struct resource *res; int ret; dp = drmm_kzalloc(drm, sizeof(*dp), GFP_KERNEL); if (!dp) return -ENOMEM; dp->dev = &pdev->dev; dp->dpsub = dpsub; dp->status = connector_status_disconnected; dp->drm = drm; INIT_DELAYED_WORK(&dp->hpd_work, zynqmp_dp_hpd_work_func); dpsub->dp = dp; /* Acquire all resources (IOMEM, IRQ and PHYs). */ res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dp"); dp->iomem = devm_ioremap_resource(dp->dev, res); if (IS_ERR(dp->iomem)) return PTR_ERR(dp->iomem); dp->irq = platform_get_irq(pdev, 0); if (dp->irq < 0) return dp->irq; dp->reset = devm_reset_control_get(dp->dev, NULL); if (IS_ERR(dp->reset)) { if (PTR_ERR(dp->reset) != -EPROBE_DEFER) dev_err(dp->dev, "failed to get reset: %ld\n", PTR_ERR(dp->reset)); return PTR_ERR(dp->reset); } ret = zynqmp_dp_reset(dp, false); if (ret < 0) return ret; ret = zynqmp_dp_phy_probe(dp); if (ret) goto err_reset; /* Initialize the hardware. */ 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_threaded_irq(dp->dev, dp->irq, NULL, zynqmp_dp_irq_handler, IRQF_ONESHOT, dev_name(dp->dev), dp); if (ret < 0) goto err_phy_exit; 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); 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); disable_irq(dp->irq); cancel_delayed_work_sync(&dp->hpd_work); zynqmp_dp_aux_cleanup(dp); 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); }
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