// SPDX-License-Identifier: GPL-2.0-only #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define DPCD_LINK_VOLTAGE_MAX 4 #define DPCD_LINK_PRE_EMPHASIS_MAX 4 #define MAX_LINK_TRAINING_LOOP 5 /* DP_TX Registers */ #define MAX_16BITS_VALUE ((1 << 16) - 1) /* 16 bits value */ #define EDP_INTR_AUX_I2C_DONE BIT(3) #define EDP_INTR_WRONG_ADDR BIT(6) #define EDP_INTR_TIMEOUT BIT(9) #define EDP_INTR_NACK_DEFER BIT(12) #define EDP_INTR_WRONG_DATA_CNT BIT(15) #define EDP_INTR_I2C_NACK BIT(18) #define EDP_INTR_I2C_DEFER BIT(21) #define EDP_INTR_PLL_UNLOCKED BIT(24) #define EDP_INTR_AUX_ERROR BIT(27) #define EDP_INTR_READY_FOR_VIDEO BIT(0) #define EDP_INTR_IDLE_PATTERN_SENT BIT(3) #define EDP_INTR_FRAME_END BIT(6) #define EDP_INTR_CRC_UPDATED BIT(9) #define EDP_INTR_SST_FIFO_UNDERFLOW BIT(28) #define REG_EDP_DP_HPD_CTRL (0x00000000) #define EDP_DP_HPD_CTRL_HPD_EN (0x00000001) #define EDP_DP_HPD_PLUG_INT_ACK (0x00000001) #define EDP_DP_IRQ_HPD_INT_ACK (0x00000002) #define EDP_DP_HPD_REPLUG_INT_ACK (0x00000004) #define EDP_DP_HPD_UNPLUG_INT_ACK (0x00000008) #define EDP_DP_HPD_STATE_STATUS_BITS_MASK (0x0000000F) #define EDP_DP_HPD_STATE_STATUS_BITS_SHIFT (0x1C) #define EDP_DP_HPD_PLUG_INT_MASK (0x00000001) #define EDP_DP_IRQ_HPD_INT_MASK (0x00000002) #define EDP_DP_HPD_REPLUG_INT_MASK (0x00000004) #define EDP_DP_HPD_UNPLUG_INT_MASK (0x00000008) #define EDP_DP_HPD_INT_MASK (EDP_DP_HPD_PLUG_INT_MASK | \ EDP_DP_IRQ_HPD_INT_MASK | \ EDP_DP_HPD_REPLUG_INT_MASK | \ EDP_DP_HPD_UNPLUG_INT_MASK) #define EDP_DP_HPD_STATE_STATUS_CONNECTED (0x40000000) #define EDP_DP_HPD_STATE_STATUS_PENDING (0x20000000) #define EDP_DP_HPD_STATE_STATUS_DISCONNECTED (0x00000000) #define EDP_DP_HPD_STATE_STATUS_MASK (0xE0000000) #define EDP_DP_HPD_REFTIMER_ENABLE (1 << 16) #define EDP_DP_HPD_EVENT_TIME_0_VAL (0x3E800FA) #define EDP_DP_HPD_EVENT_TIME_1_VAL (0x1F407D0) #define EDP_INTERRUPT_TRANS_NUM (0x000000A0) #define EDP_MAINLINK_CTRL_ENABLE (0x00000001) #define EDP_MAINLINK_CTRL_RESET (0x00000002) #define EDP_MAINLINK_CTRL_SW_BYPASS_SCRAMBLER (0x00000010) #define EDP_MAINLINK_FB_BOUNDARY_SEL (0x02000000) #define EDP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK (0x00000001) #define EDP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN (0x00000002) #define EDP_CONFIGURATION_CTRL_P_INTERLACED (0x00000004) #define EDP_CONFIGURATION_CTRL_INTERLACED_BTF (0x00000008) #define EDP_CONFIGURATION_CTRL_NUM_OF_LANES (0x00000010) #define EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING (0x00000040) #define EDP_CONFIGURATION_CTRL_SEND_VSC (0x00000080) #define EDP_CONFIGURATION_CTRL_BPC (0x00000100) #define EDP_CONFIGURATION_CTRL_ASSR (0x00000400) #define EDP_CONFIGURATION_CTRL_RGB_YUV (0x00000800) #define EDP_CONFIGURATION_CTRL_LSCLK_DIV (0x00002000) #define EDP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT (0x04) #define EDP_CONFIGURATION_CTRL_BPC_SHIFT (0x08) #define EDP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT (0x0D) #define EDP_TOTAL_HOR_VER_HORIZ__MASK (0x0000FFFF) #define EDP_TOTAL_HOR_VER_HORIZ__SHIFT (0) #define DP_EDP_CONFIGURATION_CAP 0x00d /* XXX 1.2? */ #define DP_ALTERNATE_SCRAMBLER_RESET_CAP (1 << 0) #define DP_FRAMING_CHANGE_CAP (1 << 1) #define DP_DPCD_DISPLAY_CONTROL_CAPABLE (1 << 3) /* edp v1.2 or higher */ #define EDP_MISC0_SYNCHRONOUS_CLK (0x00000001) #define EDP_MISC0_COLORIMETRY_CFG_SHIFT (0x00000001) #define EDP_MISC0_TEST_BITS_DEPTH_SHIFT (0x00000005) #define LANE0_MAPPING_SHIFT (0x00000000) #define LANE1_MAPPING_SHIFT (0x00000002) #define LANE2_MAPPING_SHIFT (0x00000004) #define LANE3_MAPPING_SHIFT (0x00000006) #define EDP_MAINLINK_READY_FOR_VIDEO (0x00000001) #define EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY (0x00000008) #define EDP_MAINLINK_SAFE_TO_EXIT_LEVEL_2 (0x00000002) #define EDP_LINK_BW_MAX DP_LINK_BW_5_4 #define DP_RECEIVER_CAP_SIZE 0xf #define DP_LINK_STATUS_SIZE 6 #define DP_TRAINING_AUX_RD_MASK 0x7F /* DP 1.3 */ /* AUX CH addresses */ /* DPCD */ #define DP_DPCD_REV 0x000 #define DP_DPCD_REV_10 0x10 #define DP_DPCD_REV_11 0x11 #define DP_DPCD_REV_12 0x12 #define DP_DPCD_REV_13 0x13 #define DP_DPCD_REV_14 0x14 #define DP_SET_POWER 0x600 #define DP_SET_POWER_D0 0x1 #define DP_SET_POWER_D3 0x2 #define DP_SET_POWER_MASK 0x3 #define DP_MAX_LINK_RATE 0x001 #define DP_MAX_LANE_COUNT 0x002 #define DP_MAX_LANE_COUNT_MASK 0x1f #define DP_TPS3_SUPPORTED (1 << 6) #define DP_ENHANCED_FRAME_CAP (1 << 7) #define DP_MAX_DOWNSPREAD 0x003 #define DP_NO_AUX_HANDSHAKE_LINK_TRAINING (1 << 6) #define DP_NORP 0x004 #define DP_DOWNSTREAMPORT_PRESENT 0x005 #define DP_DWN_STRM_PORT_PRESENT (1 << 0) #define DP_DWN_STRM_PORT_TYPE_MASK 0x06 #define DP_FORMAT_CONVERSION (1 << 3) #define DP_MAIN_LINK_CHANNEL_CODING 0x006 #define DP_EDP_CONFIGURATION_CAP 0x00d #define DP_TRAINING_AUX_RD_INTERVAL 0x00e /* link configuration */ #define DP_LINK_BW_SET 0x100 #define DP_LINK_RATE_TABLE 0x00 /* eDP 1.4 */ #define DP_LINK_BW_1_62 0x06 #define DP_LINK_BW_2_7 0x0a #define DP_LINK_BW_5_4 0x14 /* 1.2 */ #define DP_LINK_BW_8_1 0x1e /* 1.4 */ #define DP_LANE_COUNT_SET 0x101 #define DP_LANE_COUNT_MASK 0x0f #define DP_LANE_COUNT_ENHANCED_FRAME_EN (1 << 7) #define DP_TRAINING_PATTERN_SET 0x102 #define DP_TRAINING_PATTERN_DISABLE 0 #define DP_TRAINING_PATTERN_1 1 #define DP_TRAINING_PATTERN_2 2 #define DP_TRAINING_PATTERN_3 3 #define DP_TRAINING_PATTERN_MASK 0x3 #define DP_LINK_QUAL_PATTERN_DISABLE (0 << 2) #define DP_LINK_QUAL_PATTERN_D10_2 (1 << 2) #define DP_LINK_QUAL_PATTERN_ERROR_RATE (2 << 2) #define DP_LINK_QUAL_PATTERN_PRBS7 (3 << 2) #define DP_LINK_QUAL_PATTERN_MASK (3 << 2) #define DP_RECOVERED_CLOCK_OUT_EN (1 << 4) #define DP_LINK_SCRAMBLING_DISABLE (1 << 5) #define DP_EDP_CONFIGURATION_SET 0x10a #define DP_ALTERNATE_SCRAMBLER_RESET_ENABLE (1 << 0) #define DP_FRAMING_CHANGE_ENABLE (1 << 1) #define DP_PANEL_SELF_TEST_ENABLE (1 << 7) #define DP_SYMBOL_ERROR_COUNT_BOTH (0 << 6) #define DP_SYMBOL_ERROR_COUNT_DISPARITY (1 << 6) #define DP_SYMBOL_ERROR_COUNT_SYMBOL (2 << 6) #define DP_SYMBOL_ERROR_COUNT_MASK (3 << 6) #define DP_TRAINING_LANE0_SET 0x103 #define DP_TRAINING_LANE1_SET 0x104 #define DP_TRAINING_LANE2_SET 0x105 #define DP_TRAINING_LANE3_SET 0x106 #define DP_TRAIN_VOLTAGE_SWING_MASK 0x3 #define DP_TRAIN_VOLTAGE_SWING_SHIFT 0 #define DP_TRAIN_MAX_SWING_REACHED (1 << 2) #define DP_TRAIN_VOLTAGE_SWING_400 (0 << 0) #define DP_TRAIN_VOLTAGE_SWING_600 (1 << 0) #define DP_TRAIN_VOLTAGE_SWING_800 (2 << 0) #define DP_TRAIN_VOLTAGE_SWING_1200 (3 << 0) #define DP_TRAIN_PRE_EMPHASIS_MASK (3 << 3) #define DP_TRAIN_PRE_EMPHASIS_0 (0 << 3) #define DP_TRAIN_PRE_EMPHASIS_3_5 (1 << 3) #define DP_TRAIN_PRE_EMPHASIS_6 (2 << 3) #define DP_TRAIN_PRE_EMPHASIS_9_5 (3 << 3) #define DP_TRAIN_PRE_EMPHASIS_SHIFT 3 #define DP_TRAIN_MAX_PRE_EMPHASIS_REACHED (1 << 5) #define DP_DOWNSPREAD_CTRL 0x107 #define DP_SPREAD_AMP_0_5 (1 << 4) #define DP_MAIN_LINK_CHANNEL_CODING_SET 0x108 #define DP_SET_ANSI_8B10B (1 << 0) #define DP_LANE0_1_STATUS 0x202 #define DP_LANE2_3_STATUS 0x203 #define DP_LANE_CR_DONE (1 << 0) #define DP_LANE_CHANNEL_EQ_DONE (1 << 1) #define DP_LANE_SYMBOL_LOCKED (1 << 2) #define DP_CHANNEL_EQ_BITS (DP_LANE_CR_DONE | \ DP_LANE_CHANNEL_EQ_DONE | \ DP_LANE_SYMBOL_LOCKED) #define DP_LANE_ALIGN_STATUS_UPDATED 0x204 #define DP_INTERLANE_ALIGN_DONE (1 << 0) #define DP_DOWNSTREAM_PORT_STATUS_CHANGED (1 << 6) #define DP_LINK_STATUS_UPDATED (1 << 7) #define DP_ADJUST_REQUEST_LANE0_1 0x206 #define DP_ADJUST_REQUEST_LANE2_3 0x207 #define DP_ADJUST_VOLTAGE_SWING_LANE0_MASK 0x03 #define DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT 0 #define DP_ADJUST_PRE_EMPHASIS_LANE0_MASK 0x0c #define DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT 2 #define DP_ADJUST_VOLTAGE_SWING_LANE1_MASK 0x30 #define DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT 4 #define DP_ADJUST_PRE_EMPHASIS_LANE1_MASK 0xc0 #define DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT 6 #define DP_TEST_REQUEST 0x218 #define DP_TEST_LINK_TRAINING (1 << 0) #define DP_TEST_LINK_PATTERN (1 << 1) #define DP_TEST_LINK_EDID_READ (1 << 2) #define DP_TEST_LINK_PHY_TEST_PATTERN (1 << 3) /* DPCD >= 1.1 */ #define DP_TEST_LINK_RATE 0x219 #define DP_LINK_RATE_162 (0x6) #define DP_LINK_RATE_27 (0xa) #define DP_TEST_LANE_COUNT 0x220 #define DP_TEST_PATTERN 0x221 #define DP_TEST_RESPONSE 0x260 #define DP_TEST_ACK (1 << 0) #define DP_TEST_NAK (1 << 1) #define DP_TEST_EDID_CHECKSUM_WRITE (1 << 2) #define DP_SET_POWER 0x600 #define DP_SET_POWER_D0 0x1 #define DP_SET_POWER_D3 0x2 /* Link training return value */ #define EDP_TRAIN_FAIL -1 #define EDP_TRAIN_SUCCESS 0 #define EDP_TRAIN_RECONFIG 1 #define EDP_INTERRUPT_STATUS_ACK_SHIFT 1 #define EDP_INTERRUPT_STATUS_MASK_SHIFT 2 #define EDP_INTERRUPT_STATUS1 \ (EDP_INTR_AUX_I2C_DONE| \ EDP_INTR_WRONG_ADDR | EDP_INTR_TIMEOUT | \ EDP_INTR_NACK_DEFER | EDP_INTR_WRONG_DATA_CNT | \ EDP_INTR_I2C_NACK | EDP_INTR_I2C_DEFER | \ EDP_INTR_PLL_UNLOCKED | EDP_INTR_AUX_ERROR) #define EDP_INTERRUPT_STATUS1_ACK \ (EDP_INTERRUPT_STATUS1 << EDP_INTERRUPT_STATUS_ACK_SHIFT) #define EDP_INTERRUPT_STATUS1_MASK \ (EDP_INTERRUPT_STATUS1 << EDP_INTERRUPT_STATUS_MASK_SHIFT) #define EDP_INTERRUPT_STATUS2 \ (EDP_INTR_READY_FOR_VIDEO | EDP_INTR_IDLE_PATTERN_SENT | \ EDP_INTR_FRAME_END | EDP_INTR_CRC_UPDATED | EDP_INTR_SST_FIFO_UNDERFLOW) #define EDP_INTERRUPT_STATUS2_ACK \ (EDP_INTERRUPT_STATUS2 << EDP_INTERRUPT_STATUS_ACK_SHIFT) #define EDP_INTERRUPT_STATUS2_MASK \ (EDP_INTERRUPT_STATUS2 << EDP_INTERRUPT_STATUS_MASK_SHIFT) enum edp_color_depth { EDP_6BIT = 0, EDP_8BIT = 1, EDP_10BIT = 2, EDP_12BIT = 3, EDP_16BIT = 4, }; struct tu_algo_data { int64_t lclk_fp; int64_t lclk; int64_t pclk; int64_t pclk_fp; int64_t lwidth; int64_t lwidth_fp; int64_t hbp_relative_to_pclk; int64_t hbp_relative_to_pclk_fp; int nlanes; int bpp; int async_en; int bpc; int delay_start_link_extra_pclk; int extra_buffer_margin; int64_t ratio_fp; int64_t original_ratio_fp; int64_t err_fp; int64_t old_err_fp; int64_t new_err_fp; int tu_size; int tu_size_desired; int tu_size_minus1; int valid_boundary_link; int64_t resulting_valid_fp; int64_t total_valid_fp; int64_t effective_valid_fp; int64_t effective_valid_recorded_fp; int num_tus; int num_tus_per_lane; int paired_tus; int remainder_tus; int remainder_tus_upper; int remainder_tus_lower; int extra_bytes; int filler_size; int delay_start_link; int extra_pclk_cycles; int extra_pclk_cycles_in_link_clk; int64_t ratio_by_tu_fp; int64_t average_valid2_fp; int new_valid_boundary_link; int remainder_symbols_exist; int n_symbols; int64_t n_remainder_symbols_per_lane_fp; int64_t last_partial_tu_fp; int64_t TU_ratio_err_fp; int n_tus_incl_last_incomplete_tu; int extra_pclk_cycles_tmp; int extra_pclk_cycles_in_link_clk_tmp; int extra_required_bytes_new_tmp; int filler_size_tmp; int lower_filler_size_tmp; int delay_start_link_tmp; bool boundary_moderation_en; int boundary_mod_lower_err; int upper_boundary_count; int lower_boundary_count; int i_upper_boundary_count; int i_lower_boundary_count; int valid_lower_boundary_link; int even_distribution_BF; int even_distribution_legacy; int even_distribution; int min_hblank_violated; int64_t delay_start_time_fp; int64_t hbp_time_fp; int64_t hactive_time_fp; int64_t diff_abs_fp; int64_t ratio; }; struct edp_ctrl { /* Link status */ uint32_t link_rate_khz; uint8_t link_rate; uint32_t lane_cnt; uint8_t v_level; uint8_t p_level; /* Timing status */ uint32_t pixel_rate; /* in kHz */ uint32_t color_depth; }; struct edp_ctrl_tu { uint32_t tu_size_minus1; /* Desired TU Size */ uint32_t valid_boundary_link; /* Upper valid boundary */ uint32_t delay_start_link; /* # of clock cycles to delay */ bool boundary_moderation_en; /* Enable boundary Moderation? */ uint32_t valid_lower_boundary_link; /* Valid lower boundary link */ uint32_t upper_boundary_count; /* Upper boundary Count */ uint32_t lower_boundary_count; /* Lower boundary Count */ }; static uint8_t dp_get_lane_status(const uint8_t link_status[DP_LINK_STATUS_SIZE], int lane) { int i = DP_LANE0_1_STATUS + (lane >> 1); int s = (lane & 1) * 4; uint8_t l = link_status[i - DP_LANE0_1_STATUS]; return (l >> s) & 0xf; } static uint8_t edp_get_adjust_request_voltage( const uint8_t link_status[DP_LINK_STATUS_SIZE], int lane) { int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); int s = ((lane & 1) ? DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); uint8_t l = link_status[i - DP_LANE0_1_STATUS]; return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT; } static uint8_t edp_get_adjust_request_pre_emphasis( const uint8_t link_status[DP_LINK_STATUS_SIZE], int lane) { int i = DP_ADJUST_REQUEST_LANE0_1 + (lane >> 1); int s = ((lane & 1) ? DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); uint8_t l = link_status[i - DP_LANE0_1_STATUS]; return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT; } static void edp_link_train_clock_recovery_delay(const uint8_t dpcd[DP_RECEIVER_CAP_SIZE]) { int rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK; if (rd_interval > 4) printk(BIOS_ERR, "AUX interval %d, out of range (max 4)\n", rd_interval); /* * The DPCD stores the AUX read interval in units of 4 ms. * for DP v1.4 and above, clock recovery should use 100 us for AUX read intervals. */ if (rd_interval == 0 || dpcd[DP_DPCD_REV] >= DP_DPCD_REV_14) udelay(100); else mdelay(rd_interval * 4); } static bool edp_clock_recovery_ok(const uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count) { int lane; uint8_t lane_status; for (lane = 0; lane < lane_count; lane++) { lane_status = dp_get_lane_status(link_status, lane); if ((lane_status & DP_LANE_CR_DONE) == 0) { printk(BIOS_ERR, "clock recovery ok failed : %x\n", lane_status); return false; } } return true; } static void edp_link_train_channel_eq_delay(const uint8_t dpcd[DP_RECEIVER_CAP_SIZE]) { int rd_interval = dpcd[DP_TRAINING_AUX_RD_INTERVAL] & DP_TRAINING_AUX_RD_MASK; if (rd_interval > 4) printk(BIOS_INFO, "AUX interval %d, out of range (max 4)\n", rd_interval); /* * The DPCD stores the AUX read interval in units of 4 ms. * if the TRAINING_AUX_RD_INTERVAL field is 0, the channel equalization * should use 400 us AUX read intervals. */ if (rd_interval == 0) udelay(400); else mdelay(rd_interval * 4); } static bool edp_channel_eq_ok(const uint8_t link_status[DP_LINK_STATUS_SIZE], int lane_count) { uint8_t lane_align; uint8_t lane_status; int lane; lane_align = link_status[DP_LANE_ALIGN_STATUS_UPDATED - DP_LANE0_1_STATUS]; if ((lane_align & DP_INTERLANE_ALIGN_DONE) == 0) return false; for (lane = 0; lane < lane_count; lane++) { lane_status = dp_get_lane_status(link_status, lane); if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS) return false; } return true; } static void edp_ctrl_irq_enable(int enable) { if (enable) { write32(&edp_ahbclk->interrupt_status, EDP_INTERRUPT_STATUS1_MASK); write32(&edp_ahbclk->interrupt_status2, EDP_INTERRUPT_STATUS2_MASK); } else { write32(&edp_ahbclk->interrupt_status, EDP_INTERRUPT_STATUS1_ACK); write32(&edp_ahbclk->interrupt_status2, EDP_INTERRUPT_STATUS2_ACK); } } static void edp_config_ctrl(struct edp_ctrl *ctrl, uint8_t *dpcd) { uint32_t config = 0, depth = 0; /* Default-> LSCLK DIV: 1/4 LCLK */ config |= (2 << EDP_CONFIGURATION_CTRL_LSCLK_DIV_SHIFT); /* Scrambler reset enable */ if (dpcd[DP_EDP_CONFIGURATION_CAP] & DP_ALTERNATE_SCRAMBLER_RESET_CAP) config |= EDP_CONFIGURATION_CTRL_ASSR; if (ctrl->color_depth == 8) depth = EDP_8BIT; else if (ctrl->color_depth == 10) depth = EDP_10BIT; else if (ctrl->color_depth == 12) depth = EDP_12BIT; else if (ctrl->color_depth == 16) depth = EDP_16BIT; else depth = EDP_6BIT; config |= depth << EDP_CONFIGURATION_CTRL_BPC_SHIFT; /* Num of Lanes */ config |= ((ctrl->lane_cnt - 1) << EDP_CONFIGURATION_CTRL_NUM_OF_LANES_SHIFT); if (dpcd[DP_DPCD_REV] >= 0x11 && (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) config |= EDP_CONFIGURATION_CTRL_ENHANCED_FRAMING; config |= EDP_CONFIGURATION_CTRL_P_INTERLACED; /* progressive video */ /* sync clock & static Mvid */ config |= EDP_CONFIGURATION_CTRL_STATIC_DYNAMIC_CN; config |= EDP_CONFIGURATION_CTRL_SYNC_ASYNC_CLK; write32(&edp_lclk->configuration_ctrl, config); } static void edp_state_ctrl(uint32_t state) { write32(&edp_lclk->state_ctrl, state); } static int edp_lane_set_write(uint8_t voltage_level, uint8_t pre_emphasis_level) { int i; uint8_t buf[4]; if (voltage_level >= DPCD_LINK_VOLTAGE_MAX) voltage_level |= 0x04; if (pre_emphasis_level >= DPCD_LINK_PRE_EMPHASIS_MAX) pre_emphasis_level |= 0x20; for (i = 0; i < 4; i++) buf[i] = voltage_level | pre_emphasis_level; if (edp_aux_transfer(DP_TRAINING_LANE0_SET, DP_AUX_NATIVE_WRITE, buf, 2) < 2) { printk(BIOS_ERR, "%s: Set sw/pe to panel failed\n", __func__); return -1; } return 0; } static int edp_train_pattern_set_write(uint8_t pattern) { uint8_t p = pattern; printk(BIOS_INFO, "pattern=%x\n", p); if (edp_aux_transfer(DP_TRAINING_PATTERN_SET, DP_AUX_NATIVE_WRITE, &p, 1) < 1) { printk(BIOS_ERR, "%s: Set training pattern to panel failed\n", __func__); return -1; } return 0; } static void edp_sink_train_set_adjust(struct edp_ctrl *ctrl, const uint8_t *link_status) { int i; uint8_t max = 0; uint8_t data; /* use the max level across lanes */ for (i = 0; i < ctrl->lane_cnt; i++) { data = edp_get_adjust_request_voltage(link_status, i); printk(BIOS_INFO, "lane=%d req_voltage_swing=0x%x\n", i, data); if (max < data) max = data; } ctrl->v_level = max >> DP_TRAIN_VOLTAGE_SWING_SHIFT; /* use the max level across lanes */ max = 0; for (i = 0; i < ctrl->lane_cnt; i++) { data = edp_get_adjust_request_pre_emphasis(link_status, i); printk(BIOS_INFO, "lane=%d req_pre_emphasis=0x%x\n", i, data); if (max < data) max = data; } ctrl->p_level = max >> DP_TRAIN_PRE_EMPHASIS_SHIFT; printk(BIOS_INFO, "v_level=%d, p_level=%d\n", ctrl->v_level, ctrl->p_level); } static void edp_host_train_set(uint32_t train) { int cnt = 10; uint32_t data = 0; uint32_t shift = train - 1; printk(BIOS_INFO, "train=%d\n", train); edp_state_ctrl(SW_LINK_TRAINING_PATTERN1 << shift); while (--cnt) { data = read32(&edp_lclk->mainlink_ready); if (data & (EDP_MAINLINK_READY_TRAIN_PATTERN_1_READY << shift)) break; } if (cnt == 0) printk(BIOS_INFO, "%s: set link_train=%u failed\n", __func__, data); } static int edp_voltage_pre_emphasis_set(struct edp_ctrl *ctrl) { printk(BIOS_INFO, "v=%d p=%d\n", ctrl->v_level, ctrl->p_level); edp_phy_config(ctrl->v_level, ctrl->p_level); return edp_lane_set_write(ctrl->v_level, ctrl->p_level); } static int edp_start_link_train_1(struct edp_ctrl *ctrl, uint8_t *dpcd) { uint8_t link_status[DP_LINK_STATUS_SIZE]; uint8_t old_v_level; int tries; int ret, rlen; edp_state_ctrl(0); edp_host_train_set(DP_TRAINING_PATTERN_1); ret = edp_train_pattern_set_write(DP_TRAINING_PATTERN_1 | DP_LINK_SCRAMBLING_DISABLE); if (ret) return ret; ret = edp_voltage_pre_emphasis_set(ctrl); if (ret) return ret; tries = 0; old_v_level = ctrl->v_level; while (1) { edp_link_train_clock_recovery_delay(dpcd); rlen = edp_aux_transfer(DP_LANE0_1_STATUS, DP_AUX_NATIVE_READ, &link_status, DP_LINK_STATUS_SIZE); if (rlen < DP_LINK_STATUS_SIZE) { printk(BIOS_ERR, "%s: read link status failed\n", __func__); return -1; } if (edp_clock_recovery_ok(link_status, ctrl->lane_cnt)) { ret = 0; break; } if (ctrl->v_level == DPCD_LINK_VOLTAGE_MAX) { ret = -1; break; } if (old_v_level != ctrl->v_level) { tries++; if (tries >= 5) { ret = -1; break; } } else { tries = 0; old_v_level = ctrl->v_level; } edp_sink_train_set_adjust(ctrl, link_status); ret = edp_voltage_pre_emphasis_set(ctrl); if (ret) return ret; } return 0; } static int edp_start_link_train_2(struct edp_ctrl *ctrl, uint8_t *dpcd) { uint8_t link_status[DP_LINK_STATUS_SIZE]; int tries = 0; int ret, rlen; edp_host_train_set(DP_TRAINING_PATTERN_2); ret = edp_voltage_pre_emphasis_set(ctrl); if (ret) return ret; ret = edp_train_pattern_set_write(DP_TRAINING_PATTERN_2 | DP_RECOVERED_CLOCK_OUT_EN); if (ret) return ret; while (1) { edp_link_train_channel_eq_delay(dpcd); rlen = edp_aux_transfer(DP_LANE0_1_STATUS, DP_AUX_NATIVE_READ, &link_status, DP_LINK_STATUS_SIZE); if (rlen < DP_LINK_STATUS_SIZE) { printk(BIOS_ERR, "%s: read link status failed\n", __func__); return -1; } if (edp_channel_eq_ok(link_status, ctrl->lane_cnt)) { ret = 0; break; } tries++; if (tries > 10) { ret = -1; break; } edp_sink_train_set_adjust(ctrl, link_status); ret = edp_voltage_pre_emphasis_set(ctrl); if (ret) return ret; } return ret; } static int edp_link_rate_down_shift(struct edp_ctrl *ctrl, uint8_t *dpcd) { int ret = 0; int link_rate = ctrl->link_rate_khz; switch (link_rate) { case 810000: link_rate = 540000; break; case 540000: link_rate = 270000; break; case 270000: link_rate = 162000; break; case 162000: default: ret = -1; break; } if (!ret) { ctrl->link_rate_khz = link_rate; ctrl->link_rate = link_rate / 27000; printk(BIOS_INFO, "new rate=0x%x\n", ctrl->link_rate_khz); } return ret; } static bool edp_clock_recovery_reduced_lanes( const uint8_t link_status[DP_LINK_STATUS_SIZE], uint32_t lane_cnt) { int reduced_lanes = 0; if (lane_cnt <= 1) return -1; reduced_lanes = lane_cnt >> 1; return edp_clock_recovery_ok(link_status, reduced_lanes); } static int edp_link_lane_down_shift(struct edp_ctrl *ctrl, uint8_t *dpcd) { if (ctrl->lane_cnt <= 1) return -1; ctrl->lane_cnt = ctrl->lane_cnt >> 1; ctrl->link_rate_khz = dpcd[DP_MAX_LINK_RATE] * 27000; ctrl->link_rate = dpcd[DP_MAX_LINK_RATE]; ctrl->p_level = 0; ctrl->v_level = 0; return 0; } static int edp_clear_training_pattern(uint8_t *dpcd) { int ret; ret = edp_train_pattern_set_write(0); edp_link_train_channel_eq_delay(dpcd); return ret; } static int edp_do_link_train(struct edp_ctrl *ctrl, uint8_t *dpcd) { uint8_t values[2], edp_config = 0; int ret; int rlen; uint8_t link_status[DP_LINK_STATUS_SIZE]; /* * Set the current link rate and lane cnt to panel. They may have been * adjusted and the values are different from them in DPCD CAP */ values[0] = ctrl->link_rate; values[1] = ctrl->lane_cnt; if (dpcd[DP_DPCD_REV] >= 0x11 && (dpcd[DP_MAX_LANE_COUNT] & DP_ENHANCED_FRAME_CAP)) values[1] |= DP_LANE_COUNT_ENHANCED_FRAME_EN; if (edp_aux_transfer(DP_LINK_BW_SET, DP_AUX_NATIVE_WRITE, &values[0], 1) < 0) return EDP_TRAIN_FAIL; edp_aux_transfer(DP_LANE_COUNT_SET, DP_AUX_NATIVE_WRITE, &values[1], 1); ctrl->v_level = 0; /* start from default level */ ctrl->p_level = 0; values[0] = 0x10; if (dpcd[DP_MAX_DOWNSPREAD] & 1) values[0] = DP_SPREAD_AMP_0_5; values[1] = 1; edp_aux_transfer(DP_DOWNSPREAD_CTRL, DP_AUX_NATIVE_WRITE, &values[0], 1); edp_aux_transfer(DP_MAIN_LINK_CHANNEL_CODING_SET, DP_AUX_NATIVE_WRITE, &values[1], 1); ret = edp_start_link_train_1(ctrl, dpcd); if (ret < 0) { rlen = edp_aux_transfer(DP_LANE0_1_STATUS, DP_AUX_NATIVE_READ, &link_status, DP_LINK_STATUS_SIZE); if (rlen < DP_LINK_STATUS_SIZE) { printk(BIOS_ERR, "%s: read link status failed\n", __func__); return -1; } ret = edp_link_rate_down_shift(ctrl, dpcd); if (!ret) { printk(BIOS_ERR, "link reconfig\n"); ret = EDP_TRAIN_RECONFIG; } else if (ret < 0) { if (edp_clock_recovery_reduced_lanes(link_status, ctrl->lane_cnt) == 0) { if (edp_link_lane_down_shift(ctrl, dpcd) < 0) { printk(BIOS_ERR, "%s: Training 1 failed\n", __func__); ret = EDP_TRAIN_FAIL; } else { printk(BIOS_ERR, "link reconfig\n"); ret = EDP_TRAIN_RECONFIG; } } else { printk(BIOS_ERR, "%s: Training 1 failed\n", __func__); ret = EDP_TRAIN_FAIL; } } edp_clear_training_pattern(dpcd); return ret; } printk(BIOS_INFO, "Training 1 completed successfully\n"); edp_state_ctrl(0); if (edp_clear_training_pattern(dpcd)) return EDP_TRAIN_FAIL; ret = edp_start_link_train_2(ctrl, dpcd); if (ret < 0) { rlen = edp_aux_transfer(DP_LANE0_1_STATUS, DP_AUX_NATIVE_READ, &link_status, DP_LINK_STATUS_SIZE); if (rlen < DP_LINK_STATUS_SIZE) { printk(BIOS_ERR, "%s: read link status failed\n", __func__); return -1; } if (edp_clock_recovery_ok(link_status, ctrl->lane_cnt)) { if (edp_link_rate_down_shift(ctrl, dpcd) == 0) { printk(BIOS_ERR, "link reconfig\n"); ret = EDP_TRAIN_RECONFIG; } else { printk(BIOS_ERR, "%s: Training 2 failed\n", __func__); ret = EDP_TRAIN_FAIL; } } else { if (edp_link_lane_down_shift(ctrl, dpcd) < 0) { printk(BIOS_ERR, "%s: Training 1 failed\n", __func__); ret = EDP_TRAIN_FAIL; } else { printk(BIOS_ERR, "link reconfig\n"); ret = EDP_TRAIN_RECONFIG; } } edp_clear_training_pattern(dpcd); return ret; } printk(BIOS_INFO, "Training 2 completed successfully\n"); edp_config = DP_ALTERNATE_SCRAMBLER_RESET_ENABLE; edp_aux_transfer(DP_EDP_CONFIGURATION_SET, DP_AUX_NATIVE_WRITE, &edp_config, 1); return ret; } static void edp_ctrl_config_misc(struct edp_ctrl *ctrl) { uint32_t misc_val; enum edp_color_depth depth = EDP_6BIT; misc_val = read32(&edp_lclk->misc1_misc0); if (ctrl->color_depth == 8) depth = EDP_8BIT; else if (ctrl->color_depth == 10) depth = EDP_10BIT; else if (ctrl->color_depth == 12) depth = EDP_12BIT; else if (ctrl->color_depth == 16) depth = EDP_16BIT; /* clear bpp bits */ misc_val &= ~(0x07 << EDP_MISC0_TEST_BITS_DEPTH_SHIFT); misc_val |= depth << EDP_MISC0_TEST_BITS_DEPTH_SHIFT; /* Configure clock to synchronous mode */ misc_val |= EDP_MISC0_SYNCHRONOUS_CLK; write32(&edp_lclk->misc1_misc0, misc_val); } static int edp_ctrl_pixel_clock_dividers(struct edp_ctrl *ctrl, uint32_t *pixel_m, uint32_t *pixel_n) { uint32_t pixel_div = 0, dispcc_input_rate; unsigned long den, num; uint8_t rate = ctrl->link_rate; uint32_t stream_rate_khz = ctrl->pixel_rate; if (rate == DP_LINK_BW_8_1) { pixel_div = 6; } else if (rate == DP_LINK_BW_1_62 || rate == DP_LINK_BW_2_7) { pixel_div = 2; } else if (rate == DP_LINK_BW_5_4) { pixel_div = 4; } else { printk(BIOS_ERR, "Invalid pixel mux divider\n"); return -1; } dispcc_input_rate = (ctrl->link_rate_khz * 10) / pixel_div; rational_best_approximation(dispcc_input_rate, stream_rate_khz, (unsigned long)(1 << 16) - 1, (unsigned long)(1 << 16) - 1, &den, &num); *pixel_m = num; *pixel_n = den; return 0; } static int edp_ctrl_config_msa(struct edp_ctrl *ctrl) { uint32_t pixel_m, pixel_n; uint32_t mvid, nvid; u32 const nvid_fixed = 0x8000; uint8_t rate = ctrl->link_rate; if (edp_ctrl_pixel_clock_dividers(ctrl, &pixel_m, &pixel_n) < 0) return -1; pixel_n = ~(pixel_n - pixel_m); pixel_n = pixel_n & 0xFFFF; mvid = (pixel_m & 0xFFFF) * 5; nvid = (0xFFFF & (~pixel_n)) + (pixel_m & 0xFFFF); if (nvid < nvid_fixed) { u32 temp; temp = (nvid_fixed / nvid) * nvid; mvid = (nvid_fixed / nvid) * mvid; nvid = temp; } if (rate == DP_LINK_BW_5_4) nvid *= 2; if (rate == DP_LINK_BW_8_1) nvid *= 3; printk(BIOS_INFO, "mvid=0x%x, nvid=0x%x\n", mvid, nvid); write32(&edp_lclk->software_mvid, mvid); write32(&edp_lclk->software_nvid, nvid); write32(&edp_p0clk->dsc_dto, 0x0); return 0; } static void tu_valid_boundary_calc(struct tu_algo_data *tu) { int64_t f = 100000; tu->new_valid_boundary_link = DIV_ROUND_UP(tu->tu_size * tu->ratio_fp, f); tu->average_valid2_fp = ((tu->i_upper_boundary_count * tu->new_valid_boundary_link + tu->i_lower_boundary_count * (tu->new_valid_boundary_link - 1)) * f) / (tu->i_upper_boundary_count + tu->i_lower_boundary_count); tu->num_tus = ((tu->bpp * tu->lwidth_fp) / 8) / tu->average_valid2_fp; tu->n_remainder_symbols_per_lane_fp = ((tu->n_symbols * f) - (tu->num_tus * tu->average_valid2_fp)) / tu->nlanes; tu->last_partial_tu_fp = (tu->n_remainder_symbols_per_lane_fp / tu->tu_size); if (tu->n_remainder_symbols_per_lane_fp != 0) tu->remainder_symbols_exist = 1; else tu->remainder_symbols_exist = 0; tu->num_tus_per_lane = tu->num_tus / tu->nlanes; tu->paired_tus = (int)((tu->num_tus_per_lane) / (tu->i_upper_boundary_count + tu->i_lower_boundary_count)); tu->remainder_tus = tu->num_tus_per_lane - tu->paired_tus * (tu->i_upper_boundary_count + tu->i_lower_boundary_count); if ((tu->remainder_tus - tu->i_upper_boundary_count) > 0) { tu->remainder_tus_upper = tu->i_upper_boundary_count; tu->remainder_tus_lower = tu->remainder_tus - tu->i_upper_boundary_count; } else { tu->remainder_tus_upper = tu->remainder_tus; tu->remainder_tus_lower = 0; } tu->total_valid_fp = (tu->paired_tus * (tu->i_upper_boundary_count * tu->new_valid_boundary_link + tu->i_lower_boundary_count * (tu->new_valid_boundary_link - 1)) + (tu->remainder_tus_upper * tu->new_valid_boundary_link) + (tu->remainder_tus_lower * (tu->new_valid_boundary_link - 1))) * f; if (tu->remainder_symbols_exist) { tu->effective_valid_fp = (((tu->total_valid_fp + tu->n_remainder_symbols_per_lane_fp) * f) / (tu->num_tus_per_lane * f + tu->last_partial_tu_fp)); } else { tu->effective_valid_fp = (tu->total_valid_fp / tu->num_tus_per_lane); } tu->new_err_fp = tu->effective_valid_fp - (tu->ratio_fp * tu->tu_size); tu->old_err_fp = tu->average_valid2_fp - (tu->ratio_fp * tu->tu_size); tu->even_distribution = tu->num_tus % tu->nlanes == 0 ? 1 : 0; tu->n_tus_incl_last_incomplete_tu = DIV_ROUND_UP((tu->bpp * tu->lwidth_fp / 8), tu->average_valid2_fp); tu->extra_required_bytes_new_tmp = DIV_ROUND_UP((tu->average_valid2_fp - (tu->tu_size * tu->original_ratio_fp)) * tu->n_tus_incl_last_incomplete_tu, f); tu->extra_required_bytes_new_tmp += DIV_ROUND_UP(((tu->i_upper_boundary_count * tu->nlanes) * (tu->new_valid_boundary_link * f - tu->tu_size * tu->original_ratio_fp)), f); tu->extra_pclk_cycles_tmp = DIV_ROUND_UP(8 * tu->extra_required_bytes_new_tmp, tu->bpp); tu->extra_pclk_cycles_in_link_clk_tmp = DIV_ROUND_UP(tu->extra_pclk_cycles_tmp * tu->lclk_fp, tu->pclk_fp); tu->filler_size_tmp = tu->tu_size - tu->new_valid_boundary_link; tu->lower_filler_size_tmp = tu->filler_size_tmp + 1; tu->delay_start_link_tmp = tu->extra_pclk_cycles_in_link_clk_tmp + tu->lower_filler_size_tmp + tu->extra_buffer_margin; tu->delay_start_time_fp = tu->delay_start_link_tmp * f / tu->lclk; if (((tu->even_distribution == 1) || ((tu->even_distribution_BF == 0) && (tu->even_distribution_legacy == 0))) && tu->old_err_fp >= 0 && tu->new_err_fp >= 0 && (tu->new_err_fp < tu->err_fp) && ((tu->new_err_fp < tu->diff_abs_fp) || (tu->min_hblank_violated == 1)) && (tu->new_valid_boundary_link - 1) > 0 && (tu->hbp_time_fp > tu->delay_start_time_fp) && (tu->delay_start_link_tmp <= 1023)) { tu->upper_boundary_count = tu->i_upper_boundary_count; tu->lower_boundary_count = tu->i_lower_boundary_count; tu->err_fp = tu->new_err_fp; tu->boundary_moderation_en = true; tu->tu_size_desired = tu->tu_size; tu->valid_boundary_link = tu->new_valid_boundary_link; tu->effective_valid_recorded_fp = tu->effective_valid_fp; tu->even_distribution_BF = 1; tu->delay_start_link = tu->delay_start_link_tmp; } else if (tu->boundary_mod_lower_err == 0) { if (tu->new_err_fp < tu->diff_abs_fp) tu->boundary_mod_lower_err = 1; } } static void edp_ctrl_calc_tu(struct edp_ctrl *ctrl, struct edid *edid, struct edp_ctrl_tu *tu_table) { struct tu_algo_data tu = {0}; int64_t f = 100000; int64_t LCLK_FAST_SKEW_fp = (6 * f) / 1000; /* 0.0006 */ uint8_t DP_BRUTE_FORCE = 1; int64_t BRUTE_FORCE_THRESHOLD_fp = (1 * f) / 10; /* 0.1 */ int RATIO_SCALE_NUM = 1001; int RATIO_SCALE_DEN = 1000; int HBLANK_MARGIN = 4; int EXTRA_PIXCLK_CYCLE_DELAY = 4; int64_t temp = 0; int64_t temp_fp = 0; tu.lclk_fp = ctrl->link_rate_khz * f; tu.lclk = ctrl->link_rate_khz; tu.pclk = edid->mode.pixel_clock; tu.pclk_fp = edid->mode.pixel_clock * f; tu.nlanes = ctrl->lane_cnt; tu.bpp = edid->panel_bits_per_pixel; tu.lwidth = edid->mode.ha; tu.lwidth_fp = tu.lwidth * f; tu.hbp_relative_to_pclk = edid->mode.hbl; tu.hbp_relative_to_pclk_fp = tu.hbp_relative_to_pclk * f; tu.err_fp = 1000 * f; tu.extra_buffer_margin = DIV_ROUND_UP(tu.lclk * 4, tu.pclk); tu.ratio_fp = ((int64_t)(tu.pclk_fp * tu.bpp) / 8) / (tu.nlanes * tu.lclk); tu.original_ratio_fp = tu.ratio_fp; if (((tu.lwidth % tu.nlanes) != 0) && (tu.ratio_fp < f)) { tu.ratio_fp = (tu.ratio_fp * RATIO_SCALE_NUM) / RATIO_SCALE_DEN; tu.ratio_fp = tu.ratio_fp < f ? tu.ratio_fp : f; } if (tu.ratio_fp > f) tu.ratio_fp = f; for (tu.tu_size = 32; tu.tu_size <= 64; tu.tu_size++) { tu.new_err_fp = (tu.ratio_fp * tu.tu_size) - (((tu.ratio_fp * tu.tu_size) / f) * f); if (tu.new_err_fp > 0) tu.new_err_fp = f - tu.new_err_fp; if (tu.new_err_fp < tu.err_fp) { tu.err_fp = tu.new_err_fp; tu.tu_size_desired = tu.tu_size; } } tu.tu_size_minus1 = tu.tu_size_desired - 1; tu.valid_boundary_link = DIV_ROUND_UP(tu.tu_size_desired * tu.ratio_fp, f); tu.num_tus = ((tu.bpp * tu.lwidth) / 8) / tu.valid_boundary_link; tu.even_distribution_legacy = tu.num_tus % tu.nlanes == 0 ? 1 : 0; tu.extra_bytes = DIV_ROUND_UP(((tu.num_tus + 1) * (tu.valid_boundary_link * f - tu.original_ratio_fp * tu.tu_size_desired)), f); tu.extra_pclk_cycles = DIV_ROUND_UP(tu.extra_bytes * 8, tu.bpp); tu.extra_pclk_cycles_in_link_clk = DIV_ROUND_UP(tu.extra_pclk_cycles * tu.lclk, tu.pclk); tu.filler_size = tu.tu_size_desired - tu.valid_boundary_link; tu.ratio_by_tu_fp = tu.ratio_fp * tu.tu_size_desired; tu.delay_start_link = tu.extra_pclk_cycles_in_link_clk + tu.filler_size + tu.extra_buffer_margin; tu.resulting_valid_fp = tu.valid_boundary_link * f; tu.TU_ratio_err_fp = (tu.resulting_valid_fp / tu.tu_size_desired) - tu.original_ratio_fp; tu.hbp_time_fp = (tu.hbp_relative_to_pclk_fp - HBLANK_MARGIN * f) / tu.pclk; tu.delay_start_time_fp = (tu.delay_start_link * f) / tu.lclk; if (tu.hbp_time_fp < tu.delay_start_time_fp) tu.min_hblank_violated = 1; tu.hactive_time_fp = (tu.lwidth * f) / tu.pclk; if (tu.hactive_time_fp < tu.delay_start_time_fp) tu.min_hblank_violated = 1; tu.delay_start_time_fp = 0; /* brute force */ tu.delay_start_link_extra_pclk = EXTRA_PIXCLK_CYCLE_DELAY; tu.diff_abs_fp = tu.resulting_valid_fp - tu.ratio_by_tu_fp; if (tu.diff_abs_fp < 0) tu.diff_abs_fp = tu.diff_abs_fp * -1; tu.boundary_mod_lower_err = 0; if ((tu.diff_abs_fp != 0 && ((tu.diff_abs_fp > BRUTE_FORCE_THRESHOLD_fp) || (tu.even_distribution_legacy == 0) || (DP_BRUTE_FORCE == 1))) || (tu.min_hblank_violated == 1)) { do { tu.err_fp = 1000 * f; tu.extra_buffer_margin = DIV_ROUND_UP(tu.lclk_fp * tu.delay_start_link_extra_pclk, tu.pclk_fp); tu.n_symbols = DIV_ROUND_UP(tu.bpp * tu.lwidth, 8); for (tu.tu_size = 32; tu.tu_size <= 64; tu.tu_size++) { for (tu.i_upper_boundary_count = 1; tu.i_upper_boundary_count <= 15; tu.i_upper_boundary_count++) { for (tu.i_lower_boundary_count = 1; tu.i_lower_boundary_count <= 15; tu.i_lower_boundary_count++) { tu_valid_boundary_calc(&tu); } } } tu.delay_start_link_extra_pclk--; } while (tu.boundary_moderation_en != true && tu.boundary_mod_lower_err == 1 && tu.delay_start_link_extra_pclk != 0); if (tu.boundary_moderation_en == true) { tu.resulting_valid_fp = f * (tu.upper_boundary_count * tu.valid_boundary_link + tu.lower_boundary_count * (tu.valid_boundary_link - 1)); tu.resulting_valid_fp /= (tu.upper_boundary_count + tu.lower_boundary_count); tu.ratio_by_tu_fp = tu.original_ratio_fp * tu.tu_size_desired; tu.valid_lower_boundary_link = tu.valid_boundary_link - 1; tu.num_tus = ((tu.bpp / 8) * tu.lwidth_fp) / tu.resulting_valid_fp; tu.tu_size_minus1 = tu.tu_size_desired - 1; tu.even_distribution_BF = 1; tu.TU_ratio_err_fp = ((tu.tu_size_desired * f / tu.resulting_valid_fp) * f); tu.TU_ratio_err_fp -= tu.original_ratio_fp; } } temp_fp = LCLK_FAST_SKEW_fp * tu.lwidth; temp = DIV_ROUND_UP(temp_fp, f); temp_fp = ((tu.bpp * f / 8) / (tu.nlanes * tu.original_ratio_fp)) * f * temp; temp = temp_fp / f; tu.delay_start_time_fp = (tu.delay_start_link * f) / tu.lclk; /* OUTPUTS */ tu_table->valid_boundary_link = tu.valid_boundary_link; tu_table->delay_start_link = tu.delay_start_link; tu_table->boundary_moderation_en = tu.boundary_moderation_en; tu_table->valid_lower_boundary_link = tu.valid_lower_boundary_link; tu_table->upper_boundary_count = tu.upper_boundary_count; tu_table->lower_boundary_count = tu.lower_boundary_count; tu_table->tu_size_minus1 = tu.tu_size_minus1; printk(BIOS_INFO, "TU: valid_boundary_link: %d\n", tu_table->valid_boundary_link); printk(BIOS_INFO, "TU: delay_start_link: %d\n", tu_table->delay_start_link); printk(BIOS_INFO, "TU: boundary_moderation_en: %d\n", tu_table->boundary_moderation_en); printk(BIOS_INFO, "TU: valid_lower_boundary_link: %d\n", tu_table->valid_lower_boundary_link); printk(BIOS_INFO, "TU: upper_boundary_count: %d\n", tu_table->upper_boundary_count); printk(BIOS_INFO, "TU: lower_boundary_count: %d\n", tu_table->lower_boundary_count); printk(BIOS_INFO, "TU: tu_size_minus1: %d\n", tu_table->tu_size_minus1); } static void edp_ctrl_config_TU(struct edp_ctrl *ctrl, struct edid *edid) { struct edp_ctrl_tu tu_config; edp_ctrl_calc_tu(ctrl, edid, &tu_config); write32(&edp_lclk->valid_boundary, tu_config.delay_start_link << 16 | tu_config.valid_boundary_link); write32(&edp_lclk->tu, tu_config.tu_size_minus1); write32(&edp_lclk->valid_boundary2, tu_config.boundary_moderation_en | tu_config.valid_lower_boundary_link << 1| tu_config.upper_boundary_count << 16 | tu_config.lower_boundary_count << 20); } static void edp_ctrl_timing_cfg(struct edid *edid) { uint32_t hpolarity; uint32_t vpolarity; hpolarity = (edid->mode.phsync == '+'); vpolarity = (edid->mode.pvsync == '+'); /* Configure eDP timing to HW */ write32(&edp_lclk->total_hor_ver, (edid->mode.ha + edid->mode.hbl) | (((edid->mode.va + edid->mode.vbl) << 16) & 0xffff0000)); write32(&edp_lclk->start_hor_ver_from_sync, (edid->mode.hbl - edid->mode.hso) | (((edid->mode.vbl - edid->mode.vso) << 16) & 0xffff0000)); write32(&edp_lclk->hysnc_vsync_width_polarity, edid->mode.hspw | ((hpolarity << 15) & 0x8000) | ((edid->mode.vspw << 16) & 0x7fff0000) | ((vpolarity << 31) & 0x80000000)); write32(&edp_lclk->active_hor_ver, (edid->mode.ha) | ((edid->mode.va << 16) & 0xffff0000)); } static void edp_mainlink_ctrl(int enable) { uint32_t data = 0; write32(&edp_lclk->mainlink_ctrl, 0x2); if (enable) data |= (0x1); write32(&edp_lclk->mainlink_ctrl, data); } static void edp_ctrl_phy_enable(int enable) { if (enable) { write32(&edp_ahbclk->phy_ctrl, 0x4 | 0x1); write32(&edp_ahbclk->phy_ctrl, 0x0); edp_phy_enable(); } } static void edp_ctrl_phy_aux_enable(int enable) { if (enable) { /* regulators are enabled in QCLIB */ edp_ctrl_phy_enable(1); edp_aux_ctrl(1); } else { edp_aux_ctrl(0); } } static void edp_ctrl_link_enable(struct edp_ctrl *ctrl, struct edid *edid, uint8_t *dpcd, int enable) { int ret = 0; uint32_t m = 0, n = 0; if (enable) { edp_phy_power_on(ctrl->link_rate_khz); edp_phy_vm_pe_init(); mdss_clock_configure(MDSS_CLK_EDP_LINK, 0, 1, 0, 0, 0, 0); ret = mdss_clock_enable(MDSS_CLK_EDP_LINK); if (ret != 0) printk(BIOS_ERR, "failed to enable link clk\n"); mdss_clock_configure(MDSS_CLK_EDP_LINK_INTF, 0, 1, 0, 0, 0, 0); ret = mdss_clock_enable(MDSS_CLK_EDP_LINK_INTF); if (ret != 0) printk(BIOS_ERR, "failed to enable link intf clk\n"); edp_ctrl_pixel_clock_dividers(ctrl, &m, &n); mdss_clock_configure(MDSS_CLK_EDP_PIXEL, 0, 2, 0, m, n, n); ret = mdss_clock_enable(MDSS_CLK_EDP_PIXEL); if (ret != 0) printk(BIOS_ERR, "failed to enable pixel clk\n"); edp_mainlink_ctrl(1); } else { edp_mainlink_ctrl(0); } } static int edp_ctrl_training(struct edp_ctrl *ctrl, struct edid *edid, uint8_t *dpcd) { int ret; /* Do link training only when power is on */ ret = edp_do_link_train(ctrl, dpcd); while (ret == EDP_TRAIN_RECONFIG) { /* Re-configure main link */ edp_ctrl_irq_enable(0); edp_ctrl_link_enable(ctrl, edid, dpcd, 0); edp_ctrl_phy_enable(1); edp_ctrl_irq_enable(1); edp_ctrl_link_enable(ctrl, edid, dpcd, 1); ret = edp_do_link_train(ctrl, dpcd); } return ret; } static int edp_ctrl_on(struct edp_ctrl *ctrl, struct edid *edid, uint8_t *dpcd) { uint8_t value; int ret; /* * By default, use the maximum link rate and minimum lane count, * so that we can do rate down shift during link training. */ ctrl->link_rate_khz = dpcd[DP_MAX_LINK_RATE] * 27000; ctrl->link_rate = dpcd[DP_MAX_LINK_RATE]; ctrl->lane_cnt = dpcd[DP_MAX_LANE_COUNT] & DP_MAX_LANE_COUNT_MASK; ctrl->color_depth = edid->panel_bits_per_color; ctrl->pixel_rate = edid->mode.pixel_clock; /* DP_SET_POWER register is only available on DPCD v1.1 and later */ if (dpcd[DP_DPCD_REV] >= 0x11) { ret = edp_aux_transfer(DP_SET_POWER, DP_AUX_NATIVE_READ, &value, 1); if (ret < 0) { printk(BIOS_ERR, "edp native read failure\n"); return -1; } value &= ~DP_SET_POWER_MASK; value |= DP_SET_POWER_D0; ret = edp_aux_transfer(DP_SET_POWER, DP_AUX_NATIVE_WRITE, &value, 1); if (ret < 0) { printk(BIOS_ERR, "edp native read failure\n"); return -1; } /* * According to the DP 1.1 specification, a "Sink Device must * exit the power saving state within 1 ms" (Section 2.5.3.1, * Table 5-52, "Sink Control Field" (register 0x600). */ udelay(1000); } edp_ctrl_irq_enable(1); edp_ctrl_link_enable(ctrl, edid, dpcd, 1); /* Start link training */ ret = edp_ctrl_training(ctrl, edid, dpcd); if (ret != EDP_TRAIN_SUCCESS) { printk(BIOS_ERR, "edp training failure\n"); return -1; } edp_train_pattern_set_write(0); write32(&edp_lclk->mainlink_ctrl, 0x2000000); write32(&edp_lclk->mainlink_ctrl, 0x2000002); write32(&edp_lclk->mainlink_ctrl, 0x2000000); write32(&edp_lclk->mainlink_ctrl, 0x2000001); edp_config_ctrl(ctrl, dpcd); edp_ctrl_config_misc(ctrl); edp_ctrl_timing_cfg(edid); if (edp_ctrl_config_msa(ctrl) < 0) return -1; edp_ctrl_config_TU(ctrl, edid); edp_state_ctrl(SW_SEND_VIDEO); edp_ctrl_irq_enable(0); return 0; } static bool edp_ctrl_panel_connected(uint8_t *dpcd) { /* enable aux clk */ mdss_clock_configure(MDSS_CLK_EDP_AUX, 0, 0, 0, 0, 0, 0); mdss_clock_enable(MDSS_CLK_EDP_AUX); edp_ctrl_phy_aux_enable(1); edp_ctrl_irq_enable(1); if (edp_aux_transfer(DP_DPCD_REV, DP_AUX_NATIVE_READ, dpcd, DP_RECEIVER_CAP_SIZE) < DP_RECEIVER_CAP_SIZE) { printk(BIOS_ERR, "%s: AUX channel is NOT ready\n", __func__); } else { return true; } return false; } enum cb_err edp_ctrl_init(struct edid *edid) { uint8_t dpcd[DP_RECEIVER_CAP_SIZE]; struct edp_ctrl ctrl; memset(&ctrl, 0, sizeof(struct edp_ctrl)); mdss_clock_enable(GCC_EDP_CLKREF_EN); if (edp_ctrl_panel_connected(dpcd) && edp_read_edid(edid) == 0) { if (edp_ctrl_on(&ctrl, edid, dpcd) < 0) return CB_ERR; return CB_SUCCESS; } edp_ctrl_irq_enable(0); return CB_ERR; }