| Author | Tokens | Token Proportion | Commits | Commit Proportion |
|---|---|---|---|---|
| Andrey Gusakov | 6056 | 96.51% | 8 | 36.36% |
| Tomi Valkeinen | 200 | 3.19% | 7 | 31.82% |
| Rob Herring | 8 | 0.13% | 1 | 4.55% |
| Lucas Stach | 6 | 0.10% | 2 | 9.09% |
| Daniel Vetter | 2 | 0.03% | 2 | 9.09% |
| Luc Van Oostenryck | 2 | 0.03% | 1 | 4.55% |
| Marek Vašut | 1 | 0.02% | 1 | 4.55% |
| Total | 6275 | 22 |
/* * tc358767 eDP bridge driver * * Copyright (C) 2016 CogentEmbedded Inc * Author: Andrey Gusakov <andrey.gusakov@cogentembedded.com> * * Copyright (C) 2016 Pengutronix, Philipp Zabel <p.zabel@pengutronix.de> * * Copyright (C) 2016 Zodiac Inflight Innovations * * Initially based on: drivers/gpu/drm/i2c/tda998x_drv.c * * Copyright (C) 2012 Texas Instruments * Author: Rob Clark <robdclark@gmail.com> * * This program is free software; you can redistribute it and/or modify * it under the terms of the GNU General Public License as published by * the Free Software Foundation; either version 2 of the License, or * (at your option) any later version. * * This program is distributed in the hope that it will be useful, * but WITHOUT ANY WARRANTY; without even the implied warranty of * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the * GNU General Public License for more details. */ #include <linux/clk.h> #include <linux/device.h> #include <linux/gpio/consumer.h> #include <linux/i2c.h> #include <linux/kernel.h> #include <linux/module.h> #include <linux/regmap.h> #include <linux/slab.h> #include <drm/drm_atomic_helper.h> #include <drm/drm_crtc_helper.h> #include <drm/drm_dp_helper.h> #include <drm/drm_edid.h> #include <drm/drm_of.h> #include <drm/drm_panel.h> /* Registers */ /* Display Parallel Interface */ #define DPIPXLFMT 0x0440 #define VS_POL_ACTIVE_LOW (1 << 10) #define HS_POL_ACTIVE_LOW (1 << 9) #define DE_POL_ACTIVE_HIGH (0 << 8) #define SUB_CFG_TYPE_CONFIG1 (0 << 2) /* LSB aligned */ #define SUB_CFG_TYPE_CONFIG2 (1 << 2) /* Loosely Packed */ #define SUB_CFG_TYPE_CONFIG3 (2 << 2) /* LSB aligned 8-bit */ #define DPI_BPP_RGB888 (0 << 0) #define DPI_BPP_RGB666 (1 << 0) #define DPI_BPP_RGB565 (2 << 0) /* Video Path */ #define VPCTRL0 0x0450 #define OPXLFMT_RGB666 (0 << 8) #define OPXLFMT_RGB888 (1 << 8) #define FRMSYNC_DISABLED (0 << 4) /* Video Timing Gen Disabled */ #define FRMSYNC_ENABLED (1 << 4) /* Video Timing Gen Enabled */ #define MSF_DISABLED (0 << 0) /* Magic Square FRC disabled */ #define MSF_ENABLED (1 << 0) /* Magic Square FRC enabled */ #define HTIM01 0x0454 #define HTIM02 0x0458 #define VTIM01 0x045c #define VTIM02 0x0460 #define VFUEN0 0x0464 #define VFUEN BIT(0) /* Video Frame Timing Upload */ /* System */ #define TC_IDREG 0x0500 #define SYSCTRL 0x0510 #define DP0_AUDSRC_NO_INPUT (0 << 3) #define DP0_AUDSRC_I2S_RX (1 << 3) #define DP0_VIDSRC_NO_INPUT (0 << 0) #define DP0_VIDSRC_DSI_RX (1 << 0) #define DP0_VIDSRC_DPI_RX (2 << 0) #define DP0_VIDSRC_COLOR_BAR (3 << 0) /* Control */ #define DP0CTL 0x0600 #define VID_MN_GEN BIT(6) /* Auto-generate M/N values */ #define EF_EN BIT(5) /* Enable Enhanced Framing */ #define VID_EN BIT(1) /* Video transmission enable */ #define DP_EN BIT(0) /* Enable DPTX function */ /* Clocks */ #define DP0_VIDMNGEN0 0x0610 #define DP0_VIDMNGEN1 0x0614 #define DP0_VMNGENSTATUS 0x0618 /* Main Channel */ #define DP0_SECSAMPLE 0x0640 #define DP0_VIDSYNCDELAY 0x0644 #define DP0_TOTALVAL 0x0648 #define DP0_STARTVAL 0x064c #define DP0_ACTIVEVAL 0x0650 #define DP0_SYNCVAL 0x0654 #define SYNCVAL_HS_POL_ACTIVE_LOW (1 << 15) #define SYNCVAL_VS_POL_ACTIVE_LOW (1 << 31) #define DP0_MISC 0x0658 #define TU_SIZE_RECOMMENDED (63) /* LSCLK cycles per TU */ #define BPC_6 (0 << 5) #define BPC_8 (1 << 5) /* AUX channel */ #define DP0_AUXCFG0 0x0660 #define DP0_AUXCFG1 0x0664 #define AUX_RX_FILTER_EN BIT(16) #define DP0_AUXADDR 0x0668 #define DP0_AUXWDATA(i) (0x066c + (i) * 4) #define DP0_AUXRDATA(i) (0x067c + (i) * 4) #define DP0_AUXSTATUS 0x068c #define AUX_STATUS_MASK 0xf0 #define AUX_STATUS_SHIFT 4 #define AUX_TIMEOUT BIT(1) #define AUX_BUSY BIT(0) #define DP0_AUXI2CADR 0x0698 /* Link Training */ #define DP0_SRCCTRL 0x06a0 #define DP0_SRCCTRL_SCRMBLDIS BIT(13) #define DP0_SRCCTRL_EN810B BIT(12) #define DP0_SRCCTRL_NOTP (0 << 8) #define DP0_SRCCTRL_TP1 (1 << 8) #define DP0_SRCCTRL_TP2 (2 << 8) #define DP0_SRCCTRL_LANESKEW BIT(7) #define DP0_SRCCTRL_SSCG BIT(3) #define DP0_SRCCTRL_LANES_1 (0 << 2) #define DP0_SRCCTRL_LANES_2 (1 << 2) #define DP0_SRCCTRL_BW27 (1 << 1) #define DP0_SRCCTRL_BW162 (0 << 1) #define DP0_SRCCTRL_AUTOCORRECT BIT(0) #define DP0_LTSTAT 0x06d0 #define LT_LOOPDONE BIT(13) #define LT_STATUS_MASK (0x1f << 8) #define LT_CHANNEL1_EQ_BITS (DP_CHANNEL_EQ_BITS << 4) #define LT_INTERLANE_ALIGN_DONE BIT(3) #define LT_CHANNEL0_EQ_BITS (DP_CHANNEL_EQ_BITS) #define DP0_SNKLTCHGREQ 0x06d4 #define DP0_LTLOOPCTRL 0x06d8 #define DP0_SNKLTCTRL 0x06e4 #define DP1_SRCCTRL 0x07a0 /* PHY */ #define DP_PHY_CTRL 0x0800 #define DP_PHY_RST BIT(28) /* DP PHY Global Soft Reset */ #define BGREN BIT(25) /* AUX PHY BGR Enable */ #define PWR_SW_EN BIT(24) /* PHY Power Switch Enable */ #define PHY_M1_RST BIT(12) /* Reset PHY1 Main Channel */ #define PHY_RDY BIT(16) /* PHY Main Channels Ready */ #define PHY_M0_RST BIT(8) /* Reset PHY0 Main Channel */ #define PHY_2LANE BIT(2) /* PHY Enable 2 lanes */ #define PHY_A0_EN BIT(1) /* PHY Aux Channel0 Enable */ #define PHY_M0_EN BIT(0) /* PHY Main Channel0 Enable */ /* PLL */ #define DP0_PLLCTRL 0x0900 #define DP1_PLLCTRL 0x0904 /* not defined in DS */ #define PXL_PLLCTRL 0x0908 #define PLLUPDATE BIT(2) #define PLLBYP BIT(1) #define PLLEN BIT(0) #define PXL_PLLPARAM 0x0914 #define IN_SEL_REFCLK (0 << 14) #define SYS_PLLPARAM 0x0918 #define REF_FREQ_38M4 (0 << 8) /* 38.4 MHz */ #define REF_FREQ_19M2 (1 << 8) /* 19.2 MHz */ #define REF_FREQ_26M (2 << 8) /* 26 MHz */ #define REF_FREQ_13M (3 << 8) /* 13 MHz */ #define SYSCLK_SEL_LSCLK (0 << 4) #define LSCLK_DIV_1 (0 << 0) #define LSCLK_DIV_2 (1 << 0) /* Test & Debug */ #define TSTCTL 0x0a00 #define PLL_DBG 0x0a04 static bool tc_test_pattern; module_param_named(test, tc_test_pattern, bool, 0644); struct tc_edp_link { struct drm_dp_link base; u8 assr; int scrambler_dis; int spread; int coding8b10b; u8 swing; u8 preemp; }; struct tc_data { struct device *dev; struct regmap *regmap; struct drm_dp_aux aux; struct drm_bridge bridge; struct drm_connector connector; struct drm_panel *panel; /* link settings */ struct tc_edp_link link; /* display edid */ struct edid *edid; /* current mode */ struct drm_display_mode *mode; u32 rev; u8 assr; struct gpio_desc *sd_gpio; struct gpio_desc *reset_gpio; struct clk *refclk; }; static inline struct tc_data *aux_to_tc(struct drm_dp_aux *a) { return container_of(a, struct tc_data, aux); } static inline struct tc_data *bridge_to_tc(struct drm_bridge *b) { return container_of(b, struct tc_data, bridge); } static inline struct tc_data *connector_to_tc(struct drm_connector *c) { return container_of(c, struct tc_data, connector); } /* Simple macros to avoid repeated error checks */ #define tc_write(reg, var) \ do { \ ret = regmap_write(tc->regmap, reg, var); \ if (ret) \ goto err; \ } while (0) #define tc_read(reg, var) \ do { \ ret = regmap_read(tc->regmap, reg, var); \ if (ret) \ goto err; \ } while (0) static inline int tc_poll_timeout(struct regmap *map, unsigned int addr, unsigned int cond_mask, unsigned int cond_value, unsigned long sleep_us, u64 timeout_us) { ktime_t timeout = ktime_add_us(ktime_get(), timeout_us); unsigned int val; int ret; for (;;) { ret = regmap_read(map, addr, &val); if (ret) break; if ((val & cond_mask) == cond_value) break; if (timeout_us && ktime_compare(ktime_get(), timeout) > 0) { ret = regmap_read(map, addr, &val); break; } if (sleep_us) usleep_range((sleep_us >> 2) + 1, sleep_us); } return ret ?: (((val & cond_mask) == cond_value) ? 0 : -ETIMEDOUT); } static int tc_aux_wait_busy(struct tc_data *tc, unsigned int timeout_ms) { return tc_poll_timeout(tc->regmap, DP0_AUXSTATUS, AUX_BUSY, 0, 1000, 1000 * timeout_ms); } static int tc_aux_get_status(struct tc_data *tc, u8 *reply) { int ret; u32 value; ret = regmap_read(tc->regmap, DP0_AUXSTATUS, &value); if (ret < 0) return ret; if (value & AUX_BUSY) { if (value & AUX_TIMEOUT) { dev_err(tc->dev, "i2c access timeout!\n"); return -ETIMEDOUT; } return -EBUSY; } *reply = (value & AUX_STATUS_MASK) >> AUX_STATUS_SHIFT; return 0; } static ssize_t tc_aux_transfer(struct drm_dp_aux *aux, struct drm_dp_aux_msg *msg) { struct tc_data *tc = aux_to_tc(aux); size_t size = min_t(size_t, 8, msg->size); u8 request = msg->request & ~DP_AUX_I2C_MOT; u8 *buf = msg->buffer; u32 tmp = 0; int i = 0; int ret; if (size == 0) return 0; ret = tc_aux_wait_busy(tc, 100); if (ret) goto err; if (request == DP_AUX_I2C_WRITE || request == DP_AUX_NATIVE_WRITE) { /* Store data */ while (i < size) { if (request == DP_AUX_NATIVE_WRITE) tmp = tmp | (buf[i] << (8 * (i & 0x3))); else tmp = (tmp << 8) | buf[i]; i++; if (((i % 4) == 0) || (i == size)) { tc_write(DP0_AUXWDATA((i - 1) >> 2), tmp); tmp = 0; } } } else if (request != DP_AUX_I2C_READ && request != DP_AUX_NATIVE_READ) { return -EINVAL; } /* Store address */ tc_write(DP0_AUXADDR, msg->address); /* Start transfer */ tc_write(DP0_AUXCFG0, ((size - 1) << 8) | request); ret = tc_aux_wait_busy(tc, 100); if (ret) goto err; ret = tc_aux_get_status(tc, &msg->reply); if (ret) goto err; if (request == DP_AUX_I2C_READ || request == DP_AUX_NATIVE_READ) { /* Read data */ while (i < size) { if ((i % 4) == 0) tc_read(DP0_AUXRDATA(i >> 2), &tmp); buf[i] = tmp & 0xff; tmp = tmp >> 8; i++; } } return size; err: return ret; } static const char * const training_pattern1_errors[] = { "No errors", "Aux write error", "Aux read error", "Max voltage reached error", "Loop counter expired error", "res", "res", "res" }; static const char * const training_pattern2_errors[] = { "No errors", "Aux write error", "Aux read error", "Clock recovery failed error", "Loop counter expired error", "res", "res", "res" }; static u32 tc_srcctrl(struct tc_data *tc) { /* * No training pattern, skew lane 1 data by two LSCLK cycles with * respect to lane 0 data, AutoCorrect Mode = 0 */ u32 reg = DP0_SRCCTRL_NOTP | DP0_SRCCTRL_LANESKEW; if (tc->link.scrambler_dis) reg |= DP0_SRCCTRL_SCRMBLDIS; /* Scrambler Disabled */ if (tc->link.coding8b10b) /* Enable 8/10B Encoder (TxData[19:16] not used) */ reg |= DP0_SRCCTRL_EN810B; if (tc->link.spread) reg |= DP0_SRCCTRL_SSCG; /* Spread Spectrum Enable */ if (tc->link.base.num_lanes == 2) reg |= DP0_SRCCTRL_LANES_2; /* Two Main Channel Lanes */ if (tc->link.base.rate != 162000) reg |= DP0_SRCCTRL_BW27; /* 2.7 Gbps link */ return reg; } static void tc_wait_pll_lock(struct tc_data *tc) { /* Wait for PLL to lock: up to 2.09 ms, depending on refclk */ usleep_range(3000, 6000); } static int tc_pxl_pll_en(struct tc_data *tc, u32 refclk, u32 pixelclock) { int ret; int i_pre, best_pre = 1; int i_post, best_post = 1; int div, best_div = 1; int mul, best_mul = 1; int delta, best_delta; int ext_div[] = {1, 2, 3, 5, 7}; int best_pixelclock = 0; int vco_hi = 0; dev_dbg(tc->dev, "PLL: requested %d pixelclock, ref %d\n", pixelclock, refclk); best_delta = pixelclock; /* Loop over all possible ext_divs, skipping invalid configurations */ for (i_pre = 0; i_pre < ARRAY_SIZE(ext_div); i_pre++) { /* * refclk / ext_pre_div should be in the 1 to 200 MHz range. * We don't allow any refclk > 200 MHz, only check lower bounds. */ if (refclk / ext_div[i_pre] < 1000000) continue; for (i_post = 0; i_post < ARRAY_SIZE(ext_div); i_post++) { for (div = 1; div <= 16; div++) { u32 clk; u64 tmp; tmp = pixelclock * ext_div[i_pre] * ext_div[i_post] * div; do_div(tmp, refclk); mul = tmp; /* Check limits */ if ((mul < 1) || (mul > 128)) continue; clk = (refclk / ext_div[i_pre] / div) * mul; /* * refclk * mul / (ext_pre_div * pre_div) * should be in the 150 to 650 MHz range */ if ((clk > 650000000) || (clk < 150000000)) continue; clk = clk / ext_div[i_post]; delta = clk - pixelclock; if (abs(delta) < abs(best_delta)) { best_pre = i_pre; best_post = i_post; best_div = div; best_mul = mul; best_delta = delta; best_pixelclock = clk; } } } } if (best_pixelclock == 0) { dev_err(tc->dev, "Failed to calc clock for %d pixelclock\n", pixelclock); return -EINVAL; } dev_dbg(tc->dev, "PLL: got %d, delta %d\n", best_pixelclock, best_delta); dev_dbg(tc->dev, "PLL: %d / %d / %d * %d / %d\n", refclk, ext_div[best_pre], best_div, best_mul, ext_div[best_post]); /* if VCO >= 300 MHz */ if (refclk / ext_div[best_pre] / best_div * best_mul >= 300000000) vco_hi = 1; /* see DS */ if (best_div == 16) best_div = 0; if (best_mul == 128) best_mul = 0; /* Power up PLL and switch to bypass */ tc_write(PXL_PLLCTRL, PLLBYP | PLLEN); tc_write(PXL_PLLPARAM, (vco_hi << 24) | /* For PLL VCO >= 300 MHz = 1 */ (ext_div[best_pre] << 20) | /* External Pre-divider */ (ext_div[best_post] << 16) | /* External Post-divider */ IN_SEL_REFCLK | /* Use RefClk as PLL input */ (best_div << 8) | /* Divider for PLL RefClk */ (best_mul << 0)); /* Multiplier for PLL */ /* Force PLL parameter update and disable bypass */ tc_write(PXL_PLLCTRL, PLLUPDATE | PLLEN); tc_wait_pll_lock(tc); return 0; err: return ret; } static int tc_pxl_pll_dis(struct tc_data *tc) { /* Enable PLL bypass, power down PLL */ return regmap_write(tc->regmap, PXL_PLLCTRL, PLLBYP); } static int tc_stream_clock_calc(struct tc_data *tc) { int ret; /* * If the Stream clock and Link Symbol clock are * asynchronous with each other, the value of M changes over * time. This way of generating link clock and stream * clock is called Asynchronous Clock mode. The value M * must change while the value N stays constant. The * value of N in this Asynchronous Clock mode must be set * to 2^15 or 32,768. * * LSCLK = 1/10 of high speed link clock * * f_STRMCLK = M/N * f_LSCLK * M/N = f_STRMCLK / f_LSCLK * */ tc_write(DP0_VIDMNGEN1, 32768); return 0; err: return ret; } static int tc_aux_link_setup(struct tc_data *tc) { unsigned long rate; u32 value; int ret; u32 dp_phy_ctrl; rate = clk_get_rate(tc->refclk); switch (rate) { case 38400000: value = REF_FREQ_38M4; break; case 26000000: value = REF_FREQ_26M; break; case 19200000: value = REF_FREQ_19M2; break; case 13000000: value = REF_FREQ_13M; break; default: dev_err(tc->dev, "Invalid refclk rate: %lu Hz\n", rate); return -EINVAL; } /* Setup DP-PHY / PLL */ value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2; tc_write(SYS_PLLPARAM, value); dp_phy_ctrl = BGREN | PWR_SW_EN | PHY_A0_EN; if (tc->link.base.num_lanes == 2) dp_phy_ctrl |= PHY_2LANE; tc_write(DP_PHY_CTRL, dp_phy_ctrl); /* * Initially PLLs are in bypass. Force PLL parameter update, * disable PLL bypass, enable PLL */ tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN); tc_wait_pll_lock(tc); tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN); tc_wait_pll_lock(tc); ret = tc_poll_timeout(tc->regmap, DP_PHY_CTRL, PHY_RDY, PHY_RDY, 1, 1000); if (ret == -ETIMEDOUT) { dev_err(tc->dev, "Timeout waiting for PHY to become ready"); return ret; } else if (ret) goto err; /* Setup AUX link */ tc_write(DP0_AUXCFG1, AUX_RX_FILTER_EN | (0x06 << 8) | /* Aux Bit Period Calculator Threshold */ (0x3f << 0)); /* Aux Response Timeout Timer */ return 0; err: dev_err(tc->dev, "tc_aux_link_setup failed: %d\n", ret); return ret; } static int tc_get_display_props(struct tc_data *tc) { int ret; /* temp buffer */ u8 tmp[8]; /* Read DP Rx Link Capability */ ret = drm_dp_link_probe(&tc->aux, &tc->link.base); if (ret < 0) goto err_dpcd_read; if (tc->link.base.rate != 162000 && tc->link.base.rate != 270000) { dev_dbg(tc->dev, "Falling to 2.7 Gbps rate\n"); tc->link.base.rate = 270000; } if (tc->link.base.num_lanes > 2) { dev_dbg(tc->dev, "Falling to 2 lanes\n"); tc->link.base.num_lanes = 2; } ret = drm_dp_dpcd_readb(&tc->aux, DP_MAX_DOWNSPREAD, tmp); if (ret < 0) goto err_dpcd_read; tc->link.spread = tmp[0] & BIT(0); /* 0.5% down spread */ ret = drm_dp_dpcd_readb(&tc->aux, DP_MAIN_LINK_CHANNEL_CODING, tmp); if (ret < 0) goto err_dpcd_read; tc->link.coding8b10b = tmp[0] & BIT(0); tc->link.scrambler_dis = 0; /* read assr */ ret = drm_dp_dpcd_readb(&tc->aux, DP_EDP_CONFIGURATION_SET, tmp); if (ret < 0) goto err_dpcd_read; tc->link.assr = tmp[0] & DP_ALTERNATE_SCRAMBLER_RESET_ENABLE; dev_dbg(tc->dev, "DPCD rev: %d.%d, rate: %s, lanes: %d, framing: %s\n", tc->link.base.revision >> 4, tc->link.base.revision & 0x0f, (tc->link.base.rate == 162000) ? "1.62Gbps" : "2.7Gbps", tc->link.base.num_lanes, (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) ? "enhanced" : "non-enhanced"); dev_dbg(tc->dev, "ANSI 8B/10B: %d\n", tc->link.coding8b10b); dev_dbg(tc->dev, "Display ASSR: %d, TC358767 ASSR: %d\n", tc->link.assr, tc->assr); return 0; err_dpcd_read: dev_err(tc->dev, "failed to read DPCD: %d\n", ret); return ret; } static int tc_set_video_mode(struct tc_data *tc, struct drm_display_mode *mode) { int ret; int vid_sync_dly; int max_tu_symbol; int left_margin = mode->htotal - mode->hsync_end; int right_margin = mode->hsync_start - mode->hdisplay; int hsync_len = mode->hsync_end - mode->hsync_start; int upper_margin = mode->vtotal - mode->vsync_end; int lower_margin = mode->vsync_start - mode->vdisplay; int vsync_len = mode->vsync_end - mode->vsync_start; /* * Recommended maximum number of symbols transferred in a transfer unit: * DIV_ROUND_UP((input active video bandwidth in bytes) * tu_size, * (output active video bandwidth in bytes)) * Must be less than tu_size. */ max_tu_symbol = TU_SIZE_RECOMMENDED - 1; dev_dbg(tc->dev, "set mode %dx%d\n", mode->hdisplay, mode->vdisplay); dev_dbg(tc->dev, "H margin %d,%d sync %d\n", left_margin, right_margin, hsync_len); dev_dbg(tc->dev, "V margin %d,%d sync %d\n", upper_margin, lower_margin, vsync_len); dev_dbg(tc->dev, "total: %dx%d\n", mode->htotal, mode->vtotal); /* * LCD Ctl Frame Size * datasheet is not clear of vsdelay in case of DPI * assume we do not need any delay when DPI is a source of * sync signals */ tc_write(VPCTRL0, (0 << 20) /* VSDELAY */ | OPXLFMT_RGB888 | FRMSYNC_DISABLED | MSF_DISABLED); tc_write(HTIM01, (ALIGN(left_margin, 2) << 16) | /* H back porch */ (ALIGN(hsync_len, 2) << 0)); /* Hsync */ tc_write(HTIM02, (ALIGN(right_margin, 2) << 16) | /* H front porch */ (ALIGN(mode->hdisplay, 2) << 0)); /* width */ tc_write(VTIM01, (upper_margin << 16) | /* V back porch */ (vsync_len << 0)); /* Vsync */ tc_write(VTIM02, (lower_margin << 16) | /* V front porch */ (mode->vdisplay << 0)); /* height */ tc_write(VFUEN0, VFUEN); /* update settings */ /* Test pattern settings */ tc_write(TSTCTL, (120 << 24) | /* Red Color component value */ (20 << 16) | /* Green Color component value */ (99 << 8) | /* Blue Color component value */ (1 << 4) | /* Enable I2C Filter */ (2 << 0) | /* Color bar Mode */ 0); /* DP Main Stream Attributes */ vid_sync_dly = hsync_len + left_margin + mode->hdisplay; tc_write(DP0_VIDSYNCDELAY, (max_tu_symbol << 16) | /* thresh_dly */ (vid_sync_dly << 0)); tc_write(DP0_TOTALVAL, (mode->vtotal << 16) | (mode->htotal)); tc_write(DP0_STARTVAL, ((upper_margin + vsync_len) << 16) | ((left_margin + hsync_len) << 0)); tc_write(DP0_ACTIVEVAL, (mode->vdisplay << 16) | (mode->hdisplay)); tc_write(DP0_SYNCVAL, (vsync_len << 16) | (hsync_len << 0) | ((mode->flags & DRM_MODE_FLAG_NHSYNC) ? SYNCVAL_HS_POL_ACTIVE_LOW : 0) | ((mode->flags & DRM_MODE_FLAG_NVSYNC) ? SYNCVAL_VS_POL_ACTIVE_LOW : 0)); tc_write(DPIPXLFMT, VS_POL_ACTIVE_LOW | HS_POL_ACTIVE_LOW | DE_POL_ACTIVE_HIGH | SUB_CFG_TYPE_CONFIG1 | DPI_BPP_RGB888); tc_write(DP0_MISC, (max_tu_symbol << 23) | (TU_SIZE_RECOMMENDED << 16) | BPC_8); return 0; err: return ret; } static int tc_link_training(struct tc_data *tc, int pattern) { const char * const *errors; u32 srcctrl = tc_srcctrl(tc) | DP0_SRCCTRL_SCRMBLDIS | DP0_SRCCTRL_AUTOCORRECT; int timeout; int retry; u32 value; int ret; if (pattern == DP_TRAINING_PATTERN_1) { srcctrl |= DP0_SRCCTRL_TP1; errors = training_pattern1_errors; } else { srcctrl |= DP0_SRCCTRL_TP2; errors = training_pattern2_errors; } /* Set DPCD 0x102 for Training Part 1 or 2 */ tc_write(DP0_SNKLTCTRL, DP_LINK_SCRAMBLING_DISABLE | pattern); tc_write(DP0_LTLOOPCTRL, (0x0f << 28) | /* Defer Iteration Count */ (0x0f << 24) | /* Loop Iteration Count */ (0x0d << 0)); /* Loop Timer Delay */ retry = 5; do { /* Set DP0 Training Pattern */ tc_write(DP0_SRCCTRL, srcctrl); /* Enable DP0 to start Link Training */ tc_write(DP0CTL, DP_EN); /* wait */ timeout = 1000; do { tc_read(DP0_LTSTAT, &value); udelay(1); } while ((!(value & LT_LOOPDONE)) && (--timeout)); if (timeout == 0) { dev_err(tc->dev, "Link training timeout!\n"); } else { int pattern = (value >> 11) & 0x3; int error = (value >> 8) & 0x7; dev_dbg(tc->dev, "Link training phase %d done after %d uS: %s\n", pattern, 1000 - timeout, errors[error]); if (pattern == DP_TRAINING_PATTERN_1 && error == 0) break; if (pattern == DP_TRAINING_PATTERN_2) { value &= LT_CHANNEL1_EQ_BITS | LT_INTERLANE_ALIGN_DONE | LT_CHANNEL0_EQ_BITS; /* in case of two lanes */ if ((tc->link.base.num_lanes == 2) && (value == (LT_CHANNEL1_EQ_BITS | LT_INTERLANE_ALIGN_DONE | LT_CHANNEL0_EQ_BITS))) break; /* in case of one line */ if ((tc->link.base.num_lanes == 1) && (value == (LT_INTERLANE_ALIGN_DONE | LT_CHANNEL0_EQ_BITS))) break; } } /* restart */ tc_write(DP0CTL, 0); usleep_range(10, 20); } while (--retry); if (retry == 0) { dev_err(tc->dev, "Failed to finish training phase %d\n", pattern); } return 0; err: return ret; } static int tc_main_link_setup(struct tc_data *tc) { struct drm_dp_aux *aux = &tc->aux; struct device *dev = tc->dev; unsigned int rate; u32 dp_phy_ctrl; int timeout; u32 value; int ret; u8 tmp[8]; /* display mode should be set at this point */ if (!tc->mode) return -EINVAL; tc_write(DP0_SRCCTRL, tc_srcctrl(tc)); /* SSCG and BW27 on DP1 must be set to the same as on DP0 */ tc_write(DP1_SRCCTRL, (tc->link.spread ? DP0_SRCCTRL_SSCG : 0) | ((tc->link.base.rate != 162000) ? DP0_SRCCTRL_BW27 : 0)); rate = clk_get_rate(tc->refclk); switch (rate) { case 38400000: value = REF_FREQ_38M4; break; case 26000000: value = REF_FREQ_26M; break; case 19200000: value = REF_FREQ_19M2; break; case 13000000: value = REF_FREQ_13M; break; default: return -EINVAL; } value |= SYSCLK_SEL_LSCLK | LSCLK_DIV_2; tc_write(SYS_PLLPARAM, value); /* Setup Main Link */ dp_phy_ctrl = BGREN | PWR_SW_EN | PHY_A0_EN | PHY_M0_EN; if (tc->link.base.num_lanes == 2) dp_phy_ctrl |= PHY_2LANE; tc_write(DP_PHY_CTRL, dp_phy_ctrl); msleep(100); /* PLL setup */ tc_write(DP0_PLLCTRL, PLLUPDATE | PLLEN); tc_wait_pll_lock(tc); tc_write(DP1_PLLCTRL, PLLUPDATE | PLLEN); tc_wait_pll_lock(tc); /* PXL PLL setup */ if (tc_test_pattern) { ret = tc_pxl_pll_en(tc, clk_get_rate(tc->refclk), 1000 * tc->mode->clock); if (ret) goto err; } /* Reset/Enable Main Links */ dp_phy_ctrl |= DP_PHY_RST | PHY_M1_RST | PHY_M0_RST; tc_write(DP_PHY_CTRL, dp_phy_ctrl); usleep_range(100, 200); dp_phy_ctrl &= ~(DP_PHY_RST | PHY_M1_RST | PHY_M0_RST); tc_write(DP_PHY_CTRL, dp_phy_ctrl); timeout = 1000; do { tc_read(DP_PHY_CTRL, &value); udelay(1); } while ((!(value & PHY_RDY)) && (--timeout)); if (timeout == 0) { dev_err(dev, "timeout waiting for phy become ready"); return -ETIMEDOUT; } /* Set misc: 8 bits per color */ ret = regmap_update_bits(tc->regmap, DP0_MISC, BPC_8, BPC_8); if (ret) goto err; /* * ASSR mode * on TC358767 side ASSR configured through strap pin * seems there is no way to change this setting from SW * * check is tc configured for same mode */ if (tc->assr != tc->link.assr) { dev_dbg(dev, "Trying to set display to ASSR: %d\n", tc->assr); /* try to set ASSR on display side */ tmp[0] = tc->assr; ret = drm_dp_dpcd_writeb(aux, DP_EDP_CONFIGURATION_SET, tmp[0]); if (ret < 0) goto err_dpcd_read; /* read back */ ret = drm_dp_dpcd_readb(aux, DP_EDP_CONFIGURATION_SET, tmp); if (ret < 0) goto err_dpcd_read; if (tmp[0] != tc->assr) { dev_dbg(dev, "Failed to switch display ASSR to %d, falling back to unscrambled mode\n", tc->assr); /* trying with disabled scrambler */ tc->link.scrambler_dis = 1; } } /* Setup Link & DPRx Config for Training */ ret = drm_dp_link_configure(aux, &tc->link.base); if (ret < 0) goto err_dpcd_write; /* DOWNSPREAD_CTRL */ tmp[0] = tc->link.spread ? DP_SPREAD_AMP_0_5 : 0x00; /* MAIN_LINK_CHANNEL_CODING_SET */ tmp[1] = tc->link.coding8b10b ? DP_SET_ANSI_8B10B : 0x00; ret = drm_dp_dpcd_write(aux, DP_DOWNSPREAD_CTRL, tmp, 2); if (ret < 0) goto err_dpcd_write; ret = tc_link_training(tc, DP_TRAINING_PATTERN_1); if (ret) goto err; ret = tc_link_training(tc, DP_TRAINING_PATTERN_2); if (ret) goto err; /* Clear DPCD 0x102 */ /* Note: Can Not use DP0_SNKLTCTRL (0x06E4) short cut */ tmp[0] = tc->link.scrambler_dis ? DP_LINK_SCRAMBLING_DISABLE : 0x00; ret = drm_dp_dpcd_writeb(aux, DP_TRAINING_PATTERN_SET, tmp[0]); if (ret < 0) goto err_dpcd_write; /* Clear Training Pattern, set AutoCorrect Mode = 1 */ tc_write(DP0_SRCCTRL, tc_srcctrl(tc) | DP0_SRCCTRL_AUTOCORRECT); /* Wait */ timeout = 100; do { udelay(1); /* Read DPCD 0x202-0x207 */ ret = drm_dp_dpcd_read_link_status(aux, tmp + 2); if (ret < 0) goto err_dpcd_read; } while ((--timeout) && !(drm_dp_channel_eq_ok(tmp + 2, tc->link.base.num_lanes))); if (timeout == 0) { /* Read DPCD 0x200-0x201 */ ret = drm_dp_dpcd_read(aux, DP_SINK_COUNT, tmp, 2); if (ret < 0) goto err_dpcd_read; dev_err(dev, "channel(s) EQ not ok\n"); dev_info(dev, "0x0200 SINK_COUNT: 0x%02x\n", tmp[0]); dev_info(dev, "0x0201 DEVICE_SERVICE_IRQ_VECTOR: 0x%02x\n", tmp[1]); dev_info(dev, "0x0202 LANE0_1_STATUS: 0x%02x\n", tmp[2]); dev_info(dev, "0x0204 LANE_ALIGN_STATUS_UPDATED: 0x%02x\n", tmp[4]); dev_info(dev, "0x0205 SINK_STATUS: 0x%02x\n", tmp[5]); dev_info(dev, "0x0206 ADJUST_REQUEST_LANE0_1: 0x%02x\n", tmp[6]); return -EAGAIN; } ret = tc_set_video_mode(tc, tc->mode); if (ret) goto err; /* Set M/N */ ret = tc_stream_clock_calc(tc); if (ret) goto err; return 0; err_dpcd_read: dev_err(tc->dev, "Failed to read DPCD: %d\n", ret); return ret; err_dpcd_write: dev_err(tc->dev, "Failed to write DPCD: %d\n", ret); err: return ret; } static int tc_main_link_stream(struct tc_data *tc, int state) { int ret; u32 value; dev_dbg(tc->dev, "stream: %d\n", state); if (state) { value = VID_MN_GEN | DP_EN; if (tc->link.base.capabilities & DP_LINK_CAP_ENHANCED_FRAMING) value |= EF_EN; tc_write(DP0CTL, value); /* * VID_EN assertion should be delayed by at least N * LSCLK * cycles from the time VID_MN_GEN is enabled in order to * generate stable values for VID_M. LSCLK is 270 MHz or * 162 MHz, VID_N is set to 32768 in tc_stream_clock_calc(), * so a delay of at least 203 us should suffice. */ usleep_range(500, 1000); value |= VID_EN; tc_write(DP0CTL, value); /* Set input interface */ value = DP0_AUDSRC_NO_INPUT; if (tc_test_pattern) value |= DP0_VIDSRC_COLOR_BAR; else value |= DP0_VIDSRC_DPI_RX; tc_write(SYSCTRL, value); } else { tc_write(DP0CTL, 0); } return 0; err: return ret; } static void tc_bridge_pre_enable(struct drm_bridge *bridge) { struct tc_data *tc = bridge_to_tc(bridge); drm_panel_prepare(tc->panel); } static void tc_bridge_enable(struct drm_bridge *bridge) { struct tc_data *tc = bridge_to_tc(bridge); int ret; ret = tc_main_link_setup(tc); if (ret < 0) { dev_err(tc->dev, "main link setup error: %d\n", ret); return; } ret = tc_main_link_stream(tc, 1); if (ret < 0) { dev_err(tc->dev, "main link stream start error: %d\n", ret); return; } drm_panel_enable(tc->panel); } static void tc_bridge_disable(struct drm_bridge *bridge) { struct tc_data *tc = bridge_to_tc(bridge); int ret; drm_panel_disable(tc->panel); ret = tc_main_link_stream(tc, 0); if (ret < 0) dev_err(tc->dev, "main link stream stop error: %d\n", ret); } static void tc_bridge_post_disable(struct drm_bridge *bridge) { struct tc_data *tc = bridge_to_tc(bridge); drm_panel_unprepare(tc->panel); } static bool tc_bridge_mode_fixup(struct drm_bridge *bridge, const struct drm_display_mode *mode, struct drm_display_mode *adj) { /* Fixup sync polarities, both hsync and vsync are active low */ adj->flags = mode->flags; adj->flags |= (DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_NVSYNC); adj->flags &= ~(DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_PVSYNC); return true; } static enum drm_mode_status tc_connector_mode_valid(struct drm_connector *connector, struct drm_display_mode *mode) { struct tc_data *tc = connector_to_tc(connector); u32 req, avail; u32 bits_per_pixel = 24; /* DPI interface clock limitation: upto 154 MHz */ if (mode->clock > 154000) return MODE_CLOCK_HIGH; req = mode->clock * bits_per_pixel / 8; avail = tc->link.base.num_lanes * tc->link.base.rate; if (req > avail) return MODE_BAD; return MODE_OK; } static void tc_bridge_mode_set(struct drm_bridge *bridge, struct drm_display_mode *mode, struct drm_display_mode *adj) { struct tc_data *tc = bridge_to_tc(bridge); tc->mode = mode; } static int tc_connector_get_modes(struct drm_connector *connector) { struct tc_data *tc = connector_to_tc(connector); struct edid *edid; unsigned int count; if (tc->panel && tc->panel->funcs && tc->panel->funcs->get_modes) { count = tc->panel->funcs->get_modes(tc->panel); if (count > 0) return count; } edid = drm_get_edid(connector, &tc->aux.ddc); kfree(tc->edid); tc->edid = edid; if (!edid) return 0; drm_connector_update_edid_property(connector, edid); count = drm_add_edid_modes(connector, edid); return count; } static void tc_connector_set_polling(struct tc_data *tc, struct drm_connector *connector) { /* TODO: add support for HPD */ connector->polled = DRM_CONNECTOR_POLL_CONNECT | DRM_CONNECTOR_POLL_DISCONNECT; } static struct drm_encoder * tc_connector_best_encoder(struct drm_connector *connector) { struct tc_data *tc = connector_to_tc(connector); return tc->bridge.encoder; } static const struct drm_connector_helper_funcs tc_connector_helper_funcs = { .get_modes = tc_connector_get_modes, .mode_valid = tc_connector_mode_valid, .best_encoder = tc_connector_best_encoder, }; static const struct drm_connector_funcs tc_connector_funcs = { .fill_modes = drm_helper_probe_single_connector_modes, .destroy = drm_connector_cleanup, .reset = drm_atomic_helper_connector_reset, .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, }; static int tc_bridge_attach(struct drm_bridge *bridge) { u32 bus_format = MEDIA_BUS_FMT_RGB888_1X24; struct tc_data *tc = bridge_to_tc(bridge); struct drm_device *drm = bridge->dev; int ret; /* Create eDP connector */ drm_connector_helper_add(&tc->connector, &tc_connector_helper_funcs); ret = drm_connector_init(drm, &tc->connector, &tc_connector_funcs, tc->panel ? DRM_MODE_CONNECTOR_eDP : DRM_MODE_CONNECTOR_DisplayPort); if (ret) return ret; if (tc->panel) drm_panel_attach(tc->panel, &tc->connector); drm_display_info_set_bus_formats(&tc->connector.display_info, &bus_format, 1); tc->connector.display_info.bus_flags = DRM_BUS_FLAG_DE_HIGH | DRM_BUS_FLAG_PIXDATA_NEGEDGE | DRM_BUS_FLAG_SYNC_NEGEDGE; drm_connector_attach_encoder(&tc->connector, tc->bridge.encoder); return 0; } static const struct drm_bridge_funcs tc_bridge_funcs = { .attach = tc_bridge_attach, .mode_set = tc_bridge_mode_set, .pre_enable = tc_bridge_pre_enable, .enable = tc_bridge_enable, .disable = tc_bridge_disable, .post_disable = tc_bridge_post_disable, .mode_fixup = tc_bridge_mode_fixup, }; static bool tc_readable_reg(struct device *dev, unsigned int reg) { return reg != SYSCTRL; } static const struct regmap_range tc_volatile_ranges[] = { regmap_reg_range(DP0_AUXWDATA(0), DP0_AUXSTATUS), regmap_reg_range(DP0_LTSTAT, DP0_SNKLTCHGREQ), regmap_reg_range(DP_PHY_CTRL, DP_PHY_CTRL), regmap_reg_range(DP0_PLLCTRL, PXL_PLLCTRL), regmap_reg_range(VFUEN0, VFUEN0), }; static const struct regmap_access_table tc_volatile_table = { .yes_ranges = tc_volatile_ranges, .n_yes_ranges = ARRAY_SIZE(tc_volatile_ranges), }; static bool tc_writeable_reg(struct device *dev, unsigned int reg) { return (reg != TC_IDREG) && (reg != DP0_LTSTAT) && (reg != DP0_SNKLTCHGREQ); } static const struct regmap_config tc_regmap_config = { .name = "tc358767", .reg_bits = 16, .val_bits = 32, .reg_stride = 4, .max_register = PLL_DBG, .cache_type = REGCACHE_RBTREE, .readable_reg = tc_readable_reg, .volatile_table = &tc_volatile_table, .writeable_reg = tc_writeable_reg, .reg_format_endian = REGMAP_ENDIAN_BIG, .val_format_endian = REGMAP_ENDIAN_LITTLE, }; static int tc_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct device *dev = &client->dev; struct tc_data *tc; int ret; tc = devm_kzalloc(dev, sizeof(*tc), GFP_KERNEL); if (!tc) return -ENOMEM; tc->dev = dev; /* port@2 is the output port */ ret = drm_of_find_panel_or_bridge(dev->of_node, 2, 0, &tc->panel, NULL); if (ret && ret != -ENODEV) return ret; /* Shut down GPIO is optional */ tc->sd_gpio = devm_gpiod_get_optional(dev, "shutdown", GPIOD_OUT_HIGH); if (IS_ERR(tc->sd_gpio)) return PTR_ERR(tc->sd_gpio); if (tc->sd_gpio) { gpiod_set_value_cansleep(tc->sd_gpio, 0); usleep_range(5000, 10000); } /* Reset GPIO is optional */ tc->reset_gpio = devm_gpiod_get_optional(dev, "reset", GPIOD_OUT_LOW); if (IS_ERR(tc->reset_gpio)) return PTR_ERR(tc->reset_gpio); if (tc->reset_gpio) { gpiod_set_value_cansleep(tc->reset_gpio, 1); usleep_range(5000, 10000); } tc->refclk = devm_clk_get(dev, "ref"); if (IS_ERR(tc->refclk)) { ret = PTR_ERR(tc->refclk); dev_err(dev, "Failed to get refclk: %d\n", ret); return ret; } tc->regmap = devm_regmap_init_i2c(client, &tc_regmap_config); if (IS_ERR(tc->regmap)) { ret = PTR_ERR(tc->regmap); dev_err(dev, "Failed to initialize regmap: %d\n", ret); return ret; } ret = regmap_read(tc->regmap, TC_IDREG, &tc->rev); if (ret) { dev_err(tc->dev, "can not read device ID: %d\n", ret); return ret; } if ((tc->rev != 0x6601) && (tc->rev != 0x6603)) { dev_err(tc->dev, "invalid device ID: 0x%08x\n", tc->rev); return -EINVAL; } tc->assr = (tc->rev == 0x6601); /* Enable ASSR for eDP panels */ ret = tc_aux_link_setup(tc); if (ret) return ret; /* Register DP AUX channel */ tc->aux.name = "TC358767 AUX i2c adapter"; tc->aux.dev = tc->dev; tc->aux.transfer = tc_aux_transfer; ret = drm_dp_aux_register(&tc->aux); if (ret) return ret; ret = tc_get_display_props(tc); if (ret) goto err_unregister_aux; tc_connector_set_polling(tc, &tc->connector); tc->bridge.funcs = &tc_bridge_funcs; tc->bridge.of_node = dev->of_node; drm_bridge_add(&tc->bridge); i2c_set_clientdata(client, tc); return 0; err_unregister_aux: drm_dp_aux_unregister(&tc->aux); return ret; } static int tc_remove(struct i2c_client *client) { struct tc_data *tc = i2c_get_clientdata(client); drm_bridge_remove(&tc->bridge); drm_dp_aux_unregister(&tc->aux); tc_pxl_pll_dis(tc); return 0; } static const struct i2c_device_id tc358767_i2c_ids[] = { { "tc358767", 0 }, { } }; MODULE_DEVICE_TABLE(i2c, tc358767_i2c_ids); static const struct of_device_id tc358767_of_ids[] = { { .compatible = "toshiba,tc358767", }, { } }; MODULE_DEVICE_TABLE(of, tc358767_of_ids); static struct i2c_driver tc358767_driver = { .driver = { .name = "tc358767", .of_match_table = tc358767_of_ids, }, .id_table = tc358767_i2c_ids, .probe = tc_probe, .remove = tc_remove, }; module_i2c_driver(tc358767_driver); MODULE_AUTHOR("Andrey Gusakov <andrey.gusakov@cogentembedded.com>"); MODULE_DESCRIPTION("tc358767 eDP encoder driver"); MODULE_LICENSE("GPL");
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