diff options
Diffstat (limited to 'drivers/video/rockchip/rk_edp.c')
-rw-r--r-- | drivers/video/rockchip/rk_edp.c | 1085 |
1 files changed, 1085 insertions, 0 deletions
diff --git a/drivers/video/rockchip/rk_edp.c b/drivers/video/rockchip/rk_edp.c new file mode 100644 index 0000000..124ddf6 --- /dev/null +++ b/drivers/video/rockchip/rk_edp.c @@ -0,0 +1,1085 @@ +/* + * Copyright (c) 2015 Google, Inc + * Copyright 2014 Rockchip Inc. + * + * SPDX-License-Identifier: GPL-2.0+ + */ + +#include <common.h> +#include <clk.h> +#include <display.h> +#include <dm.h> +#include <edid.h> +#include <panel.h> +#include <regmap.h> +#include <syscon.h> +#include <asm/gpio.h> +#include <asm/io.h> +#include <asm/arch/clock.h> +#include <asm/arch/edp_rk3288.h> +#include <asm/arch/grf_rk3288.h> +#include <dt-bindings/clock/rk3288-cru.h> + +DECLARE_GLOBAL_DATA_PTR; + +#define MAX_CR_LOOP 5 +#define MAX_EQ_LOOP 5 +#define DP_LINK_STATUS_SIZE 6 + +static const char * const voltage_names[] = { + "0.4V", "0.6V", "0.8V", "1.2V" +}; +static const char * const pre_emph_names[] = { + "0dB", "3.5dB", "6dB", "9.5dB" +}; + +#define DP_VOLTAGE_MAX DP_TRAIN_VOLTAGE_SWING_1200 +#define DP_PRE_EMPHASIS_MAX DP_TRAIN_PRE_EMPHASIS_9_5 + +struct rk_edp_priv { + struct rk3288_edp *regs; + struct rk3288_grf *grf; + struct udevice *panel; + struct link_train link_train; + u8 train_set[4]; +}; + +static void rk_edp_init_refclk(struct rk3288_edp *regs) +{ + writel(SEL_24M, ®s->analog_ctl_2); + writel(REF_CLK_24M, ®s->pll_reg_1); + + writel(LDO_OUTPUT_V_SEL_145 | KVCO_DEFALUT | CHG_PUMP_CUR_SEL_5US | + V2L_CUR_SEL_1MA, ®s->pll_reg_2); + + writel(LOCK_DET_CNT_SEL_256 | LOOP_FILTER_RESET | PALL_SSC_RESET | + LOCK_DET_BYPASS | PLL_LOCK_DET_MODE | PLL_LOCK_DET_FORCE, + ®s->pll_reg_3); + + writel(REGULATOR_V_SEL_950MV | STANDBY_CUR_SEL | + CHG_PUMP_INOUT_CTRL_1200MV | CHG_PUMP_INPUT_CTRL_OP, + ®s->pll_reg_5); + + writel(SSC_OFFSET | SSC_MODE | SSC_DEPTH, ®s->ssc_reg); + + writel(TX_SWING_PRE_EMP_MODE | PRE_DRIVER_PW_CTRL1 | + LP_MODE_CLK_REGULATOR | RESISTOR_MSB_CTRL | RESISTOR_CTRL, + ®s->tx_common); + + writel(DP_AUX_COMMON_MODE | DP_AUX_EN | AUX_TERM_50OHM, + ®s->dp_aux); + + writel(DP_BG_OUT_SEL | DP_DB_CUR_CTRL | DP_BG_SEL | DP_RESISTOR_TUNE_BG, + ®s->dp_bias); + + writel(CH1_CH3_SWING_EMP_CTRL | CH0_CH2_SWING_EMP_CTRL, + ®s->dp_reserv2); +} + +static void rk_edp_init_interrupt(struct rk3288_edp *regs) +{ + /* Set interrupt pin assertion polarity as high */ + writel(INT_POL, ®s->int_ctl); + + /* Clear pending registers */ + writel(0xff, ®s->common_int_sta_1); + writel(0x4f, ®s->common_int_sta_2); + writel(0xff, ®s->common_int_sta_3); + writel(0x27, ®s->common_int_sta_4); + writel(0x7f, ®s->dp_int_sta); + + /* 0:mask,1: unmask */ + writel(0x00, ®s->common_int_mask_1); + writel(0x00, ®s->common_int_mask_2); + writel(0x00, ®s->common_int_mask_3); + writel(0x00, ®s->common_int_mask_4); + writel(0x00, ®s->int_sta_mask); +} + +static void rk_edp_enable_sw_function(struct rk3288_edp *regs) +{ + clrbits_le32(®s->func_en_1, SW_FUNC_EN_N); +} + +static bool rk_edp_get_pll_locked(struct rk3288_edp *regs) +{ + u32 val; + + val = readl(®s->dp_debug_ctl); + + return val & PLL_LOCK; +} + +static int rk_edp_init_analog_func(struct rk3288_edp *regs) +{ + ulong start; + + writel(0x00, ®s->dp_pd); + writel(PLL_LOCK_CHG, ®s->common_int_sta_1); + + clrbits_le32(®s->dp_debug_ctl, F_PLL_LOCK | PLL_LOCK_CTRL); + + start = get_timer(0); + while (!rk_edp_get_pll_locked(regs)) { + if (get_timer(start) > PLL_LOCK_TIMEOUT) { + printf("%s: PLL is not locked\n", __func__); + return -ETIMEDOUT; + } + } + + /* Enable Serdes FIFO function and Link symbol clock domain module */ + clrbits_le32(®s->func_en_2, SERDES_FIFO_FUNC_EN_N | + LS_CLK_DOMAIN_FUNC_EN_N | AUX_FUNC_EN_N | + SSC_FUNC_EN_N); + + return 0; +} + +static void rk_edp_init_aux(struct rk3288_edp *regs) +{ + /* Clear inerrupts related to AUX channel */ + writel(AUX_FUNC_EN_N, ®s->dp_int_sta); + + /* Disable AUX channel module */ + setbits_le32(®s->func_en_2, AUX_FUNC_EN_N); + + /* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */ + writel(DEFER_CTRL_EN | DEFER_COUNT(1), ®s->aux_ch_defer_dtl); + + /* Enable AUX channel module */ + clrbits_le32(®s->func_en_2, AUX_FUNC_EN_N); +} + +static int rk_edp_aux_enable(struct rk3288_edp *regs) +{ + ulong start; + + setbits_le32(®s->aux_ch_ctl_2, AUX_EN); + start = get_timer(0); + do { + if (!(readl(®s->aux_ch_ctl_2) & AUX_EN)) + return 0; + } while (get_timer(start) < 20); + + return -ETIMEDOUT; +} + +static int rk_edp_is_aux_reply(struct rk3288_edp *regs) +{ + ulong start; + + start = get_timer(0); + while (!(readl(®s->dp_int_sta) & RPLY_RECEIV)) { + if (get_timer(start) > 10) + return -ETIMEDOUT; + } + + writel(RPLY_RECEIV, ®s->dp_int_sta); + + return 0; +} + +static int rk_edp_start_aux_transaction(struct rk3288_edp *regs) +{ + int val, ret; + + /* Enable AUX CH operation */ + ret = rk_edp_aux_enable(regs); + if (ret) { + debug("AUX CH enable timeout!\n"); + return ret; + } + + /* Is AUX CH command reply received? */ + if (rk_edp_is_aux_reply(regs)) { + debug("AUX CH command reply failed!\n"); + return ret; + } + + /* Clear interrupt source for AUX CH access error */ + val = readl(®s->dp_int_sta); + if (val & AUX_ERR) { + writel(AUX_ERR, ®s->dp_int_sta); + return -EIO; + } + + /* Check AUX CH error access status */ + val = readl(®s->dp_int_sta); + if (val & AUX_STATUS_MASK) { + debug("AUX CH error happens: %d\n\n", val & AUX_STATUS_MASK); + return -EIO; + } + + return 0; +} + +static int rk_edp_dpcd_transfer(struct rk3288_edp *regs, + unsigned int val_addr, u8 *in_data, + unsigned int length, + enum dpcd_request request) +{ + int val; + int i, try_times; + u8 *data; + int ret = 0; + u32 len = 0; + + while (length) { + len = min(length, 16U); + for (try_times = 0; try_times < 10; try_times++) { + data = in_data; + /* Clear AUX CH data buffer */ + writel(BUF_CLR, ®s->buf_data_ctl); + + /* Select DPCD device address */ + writel(AUX_ADDR_7_0(val_addr), ®s->aux_addr_7_0); + writel(AUX_ADDR_15_8(val_addr), ®s->aux_addr_15_8); + writel(AUX_ADDR_19_16(val_addr), ®s->aux_addr_19_16); + + /* + * Set DisplayPort transaction and read 1 byte + * If bit 3 is 1, DisplayPort transaction. + * If Bit 3 is 0, I2C transaction. + */ + if (request == DPCD_WRITE) { + val = AUX_LENGTH(len) | + AUX_TX_COMM_DP_TRANSACTION | + AUX_TX_COMM_WRITE; + for (i = 0; i < len; i++) + writel(*data++, ®s->buf_data[i]); + } else + val = AUX_LENGTH(len) | + AUX_TX_COMM_DP_TRANSACTION | + AUX_TX_COMM_READ; + + writel(val, ®s->aux_ch_ctl_1); + + /* Start AUX transaction */ + ret = rk_edp_start_aux_transaction(regs); + if (ret == 0) + break; + else + printf("read dpcd Aux Transaction fail!\n"); + } + + if (ret) + return ret; + + if (request == DPCD_READ) { + for (i = 0; i < len; i++) + *data++ = (u8)readl(®s->buf_data[i]); + } + + length -= len; + val_addr += len; + in_data += len; + } + + return 0; +} + +static int rk_edp_dpcd_read(struct rk3288_edp *regs, u32 addr, u8 *values, + size_t size) +{ + return rk_edp_dpcd_transfer(regs, addr, values, size, DPCD_READ); +} + +static int rk_edp_dpcd_write(struct rk3288_edp *regs, u32 addr, u8 *values, + size_t size) +{ + return rk_edp_dpcd_transfer(regs, addr, values, size, DPCD_WRITE); +} + + +static int rk_edp_link_power_up(struct rk_edp_priv *edp) +{ + u8 value; + int ret; + + /* DP_SET_POWER register is only available on DPCD v1.1 and later */ + if (edp->link_train.revision < 0x11) + return 0; + + ret = rk_edp_dpcd_read(edp->regs, DPCD_LINK_POWER_STATE, &value, 1); + if (ret) + return ret; + + value &= ~DP_SET_POWER_MASK; + value |= DP_SET_POWER_D0; + + ret = rk_edp_dpcd_write(edp->regs, DPCD_LINK_POWER_STATE, &value, 1); + if (ret) + return ret; + + /* + * 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). + */ + mdelay(1); + + return 0; +} + +static int rk_edp_link_configure(struct rk_edp_priv *edp) +{ + u8 values[2]; + + values[0] = edp->link_train.link_rate; + values[1] = edp->link_train.lane_count; + + return rk_edp_dpcd_write(edp->regs, DPCD_LINK_BW_SET, values, + sizeof(values)); +} + +static void rk_edp_set_link_training(struct rk_edp_priv *edp, + const u8 *training_values) +{ + int i; + + for (i = 0; i < edp->link_train.lane_count; i++) + writel(training_values[i], &edp->regs->ln_link_trn_ctl[i]); +} + +static u8 edp_link_status(const u8 *link_status, int r) +{ + return link_status[r - DPCD_LANE0_1_STATUS]; +} + +static int rk_edp_dpcd_read_link_status(struct rk_edp_priv *edp, + u8 *link_status) +{ + return rk_edp_dpcd_read(edp->regs, DPCD_LANE0_1_STATUS, link_status, + DP_LINK_STATUS_SIZE); +} + +static u8 edp_get_lane_status(const u8 *link_status, int lane) +{ + int i = DPCD_LANE0_1_STATUS + (lane >> 1); + int s = (lane & 1) * 4; + u8 l = edp_link_status(link_status, i); + + return (l >> s) & 0xf; +} + +static int rk_edp_clock_recovery(const u8 *link_status, int lane_count) +{ + int lane; + u8 lane_status; + + for (lane = 0; lane < lane_count; lane++) { + lane_status = edp_get_lane_status(link_status, lane); + if ((lane_status & DP_LANE_CR_DONE) == 0) + return -EIO; + } + + return 0; +} + +static int rk_edp_channel_eq(const u8 *link_status, int lane_count) +{ + u8 lane_align; + u8 lane_status; + int lane; + + lane_align = edp_link_status(link_status, + DPCD_LANE_ALIGN_STATUS_UPDATED); + if (!(lane_align & DP_INTERLANE_ALIGN_DONE)) + return -EIO; + for (lane = 0; lane < lane_count; lane++) { + lane_status = edp_get_lane_status(link_status, lane); + if ((lane_status & DP_CHANNEL_EQ_BITS) != DP_CHANNEL_EQ_BITS) + return -EIO; + } + + return 0; +} + +static uint rk_edp_get_adjust_request_voltage(const u8 *link_status, int lane) +{ + int i = DPCD_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_VOLTAGE_SWING_LANE1_SHIFT : + DP_ADJUST_VOLTAGE_SWING_LANE0_SHIFT); + u8 l = edp_link_status(link_status, i); + + return ((l >> s) & 0x3) << DP_TRAIN_VOLTAGE_SWING_SHIFT; +} + +static uint rk_edp_get_adjust_request_pre_emphasis(const u8 *link_status, + int lane) +{ + int i = DPCD_ADJUST_REQUEST_LANE0_1 + (lane >> 1); + int s = ((lane & 1) ? + DP_ADJUST_PRE_EMPHASIS_LANE1_SHIFT : + DP_ADJUST_PRE_EMPHASIS_LANE0_SHIFT); + u8 l = edp_link_status(link_status, i); + + return ((l >> s) & 0x3) << DP_TRAIN_PRE_EMPHASIS_SHIFT; +} + +static void edp_get_adjust_train(const u8 *link_status, int lane_count, + u8 train_set[]) +{ + uint v = 0; + uint p = 0; + int lane; + + for (lane = 0; lane < lane_count; lane++) { + uint this_v, this_p; + + this_v = rk_edp_get_adjust_request_voltage(link_status, lane); + this_p = rk_edp_get_adjust_request_pre_emphasis(link_status, + lane); + + debug("requested signal parameters: lane %d voltage %s pre_emph %s\n", + lane, + voltage_names[this_v >> DP_TRAIN_VOLTAGE_SWING_SHIFT], + pre_emph_names[this_p >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); + + if (this_v > v) + v = this_v; + if (this_p > p) + p = this_p; + } + + if (v >= DP_VOLTAGE_MAX) + v |= DP_TRAIN_MAX_SWING_REACHED; + + if (p >= DP_PRE_EMPHASIS_MAX) + p |= DP_TRAIN_MAX_PRE_EMPHASIS_REACHED; + + debug("using signal parameters: voltage %s pre_emph %s\n", + voltage_names[(v & DP_TRAIN_VOLTAGE_SWING_MASK) + >> DP_TRAIN_VOLTAGE_SWING_SHIFT], + pre_emph_names[(p & DP_TRAIN_PRE_EMPHASIS_MASK) + >> DP_TRAIN_PRE_EMPHASIS_SHIFT]); + + for (lane = 0; lane < 4; lane++) + train_set[lane] = v | p; +} + +static int rk_edp_link_train_cr(struct rk_edp_priv *edp) +{ + struct rk3288_edp *regs = edp->regs; + int clock_recovery; + uint voltage, tries = 0; + u8 status[DP_LINK_STATUS_SIZE]; + int i, ret; + u8 value; + + value = DP_TRAINING_PATTERN_1; + writel(value, ®s->dp_training_ptn_set); + ret = rk_edp_dpcd_write(regs, DPCD_TRAINING_PATTERN_SET, &value, 1); + if (ret) + return ret; + memset(edp->train_set, '\0', sizeof(edp->train_set)); + + /* clock recovery loop */ + clock_recovery = 0; + tries = 0; + voltage = 0xff; + + while (1) { + rk_edp_set_link_training(edp, edp->train_set); + ret = rk_edp_dpcd_write(regs, DPCD_TRAINING_LANE0_SET, + edp->train_set, + edp->link_train.lane_count); + if (ret) + return ret; + + mdelay(1); + + ret = rk_edp_dpcd_read_link_status(edp, status); + if (ret) { + printf("displayport link status failed, ret=%d\n", ret); + break; + } + + clock_recovery = rk_edp_clock_recovery(status, + edp->link_train.lane_count); + if (!clock_recovery) + break; + + for (i = 0; i < edp->link_train.lane_count; i++) { + if ((edp->train_set[i] & + DP_TRAIN_MAX_SWING_REACHED) == 0) + break; + } + if (i == edp->link_train.lane_count) { + printf("clock recovery reached max voltage\n"); + break; + } + + if ((edp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK) == + voltage) { + if (++tries == MAX_CR_LOOP) { + printf("clock recovery tried 5 times\n"); + break; + } + } else { + tries = 0; + } + + voltage = edp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK; + + /* Compute new train_set as requested by sink */ + edp_get_adjust_train(status, edp->link_train.lane_count, + edp->train_set); + } + if (clock_recovery) { + printf("clock recovery failed: %d\n", clock_recovery); + return clock_recovery; + } else { + debug("clock recovery at voltage %d pre-emphasis %d\n", + edp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, + (edp->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) >> + DP_TRAIN_PRE_EMPHASIS_SHIFT); + return 0; + } +} + +static int rk_edp_link_train_ce(struct rk_edp_priv *edp) +{ + struct rk3288_edp *regs = edp->regs; + int channel_eq; + u8 value; + int tries; + u8 status[DP_LINK_STATUS_SIZE]; + int ret; + + value = DP_TRAINING_PATTERN_2; + writel(value, ®s->dp_training_ptn_set); + ret = rk_edp_dpcd_write(regs, DPCD_TRAINING_PATTERN_SET, &value, 1); + if (ret) + return ret; + + /* channel equalization loop */ + channel_eq = 0; + for (tries = 0; tries < 5; tries++) { + rk_edp_set_link_training(edp, edp->train_set); + udelay(400); + + if (rk_edp_dpcd_read_link_status(edp, status) < 0) { + printf("displayport link status failed\n"); + return -1; + } + + channel_eq = rk_edp_channel_eq(status, + edp->link_train.lane_count); + if (!channel_eq) + break; + edp_get_adjust_train(status, edp->link_train.lane_count, + edp->train_set); + } + + if (channel_eq) { + printf("channel eq failed, ret=%d\n", channel_eq); + return channel_eq; + } + + debug("channel eq at voltage %d pre-emphasis %d\n", + edp->train_set[0] & DP_TRAIN_VOLTAGE_SWING_MASK, + (edp->train_set[0] & DP_TRAIN_PRE_EMPHASIS_MASK) + >> DP_TRAIN_PRE_EMPHASIS_SHIFT); + + return 0; +} + +static int rk_edp_init_training(struct rk_edp_priv *edp) +{ + u8 values[3]; + int ret; + + ret = rk_edp_dpcd_read(edp->regs, DPCD_DPCD_REV, values, + sizeof(values)); + if (ret < 0) + return ret; + + edp->link_train.revision = values[0]; + edp->link_train.link_rate = values[1]; + edp->link_train.lane_count = values[2] & DP_MAX_LANE_COUNT_MASK; + + debug("max link rate:%d.%dGps max number of lanes:%d\n", + edp->link_train.link_rate * 27 / 100, + edp->link_train.link_rate * 27 % 100, + edp->link_train.lane_count); + + if ((edp->link_train.link_rate != LINK_RATE_1_62GBPS) && + (edp->link_train.link_rate != LINK_RATE_2_70GBPS)) { + debug("Rx Max Link Rate is abnormal :%x\n", + edp->link_train.link_rate); + return -EPERM; + } + + if (edp->link_train.lane_count == 0) { + debug("Rx Max Lane count is abnormal :%x\n", + edp->link_train.lane_count); + return -EPERM; + } + + ret = rk_edp_link_power_up(edp); + if (ret) + return ret; + + return rk_edp_link_configure(edp); +} + +static int rk_edp_hw_link_training(struct rk_edp_priv *edp) +{ + ulong start; + u32 val; + int ret; + + /* Set link rate and count as you want to establish */ + writel(edp->link_train.link_rate, &edp->regs->link_bw_set); + writel(edp->link_train.lane_count, &edp->regs->lane_count_set); + + ret = rk_edp_link_train_cr(edp); + if (ret) + return ret; + ret = rk_edp_link_train_ce(edp); + if (ret) + return ret; + + writel(HW_LT_EN, &edp->regs->dp_hw_link_training); + start = get_timer(0); + do { + val = readl(&edp->regs->dp_hw_link_training); + if (!(val & HW_LT_EN)) + break; + } while (get_timer(start) < 10); + + if (val & HW_LT_ERR_CODE_MASK) { + printf("edp hw link training error: %d\n", + val >> HW_LT_ERR_CODE_SHIFT); + return -EIO; + } + + return 0; +} + +static int rk_edp_select_i2c_device(struct rk3288_edp *regs, + unsigned int device_addr, + unsigned int val_addr) +{ + int ret; + + /* Set EDID device address */ + writel(device_addr, ®s->aux_addr_7_0); + writel(0x0, ®s->aux_addr_15_8); + writel(0x0, ®s->aux_addr_19_16); + + /* Set offset from base address of EDID device */ + writel(val_addr, ®s->buf_data[0]); + + /* + * Set I2C transaction and write address + * If bit 3 is 1, DisplayPort transaction. + * If Bit 3 is 0, I2C transaction. + */ + writel(AUX_TX_COMM_I2C_TRANSACTION | AUX_TX_COMM_MOT | + AUX_TX_COMM_WRITE, ®s->aux_ch_ctl_1); + + /* Start AUX transaction */ + ret = rk_edp_start_aux_transaction(regs); + if (ret != 0) { + debug("select_i2c_device Aux Transaction fail!\n"); + return ret; + } + + return 0; +} + +static int rk_edp_i2c_read(struct rk3288_edp *regs, unsigned int device_addr, + unsigned int val_addr, unsigned int count, u8 edid[]) +{ + u32 val; + unsigned int i, j; + unsigned int cur_data_idx; + unsigned int defer = 0; + int ret = 0; + + for (i = 0; i < count; i += 16) { + for (j = 0; j < 10; j++) { /* try 10 times */ + /* Clear AUX CH data buffer */ + writel(BUF_CLR, ®s->buf_data_ctl); + + /* Set normal AUX CH command */ + clrbits_le32(®s->aux_ch_ctl_2, ADDR_ONLY); + + /* + * If Rx sends defer, Tx sends only reads + * request without sending addres + */ + if (!defer) { + ret = rk_edp_select_i2c_device(regs, + device_addr, + val_addr + i); + } else { + defer = 0; + } + + /* + * Set I2C transaction and write data + * If bit 3 is 1, DisplayPort transaction. + * If Bit 3 is 0, I2C transaction. + */ + writel(AUX_LENGTH(16) | AUX_TX_COMM_I2C_TRANSACTION | + AUX_TX_COMM_READ, ®s->aux_ch_ctl_1); + + /* Start AUX transaction */ + ret = rk_edp_start_aux_transaction(regs); + if (ret == 0) { + break; + } else { + debug("Aux Transaction fail!\n"); + continue; + } + + /* Check if Rx sends defer */ + val = readl(®s->aux_rx_comm); + if (val == AUX_RX_COMM_AUX_DEFER || + val == AUX_RX_COMM_I2C_DEFER) { + debug("Defer: %d\n\n", val); + defer = 1; + } + } + + if (ret) + return ret; + + for (cur_data_idx = 0; cur_data_idx < 16; cur_data_idx++) { + val = readl(®s->buf_data[cur_data_idx]); + edid[i + cur_data_idx] = (u8)val; + } + } + + return 0; +} + +static int rk_edp_set_link_train(struct rk_edp_priv *edp) +{ + int ret; + + ret = rk_edp_init_training(edp); + if (ret) { + printf("DP LT init failed!\n"); + return ret; + } + + ret = rk_edp_hw_link_training(edp); + if (ret) + return ret; + + return 0; +} + +static void rk_edp_init_video(struct rk3288_edp *regs) +{ + writel(VSYNC_DET | VID_FORMAT_CHG | VID_CLK_CHG, + ®s->common_int_sta_1); + writel(CHA_CRI(4) | CHA_CTRL, ®s->sys_ctl_2); + writel(VID_HRES_TH(2) | VID_VRES_TH(0), ®s->video_ctl_8); +} + +static void rk_edp_config_video_slave_mode(struct rk3288_edp *regs) +{ + clrbits_le32(®s->func_en_1, VID_FIFO_FUNC_EN_N | VID_CAP_FUNC_EN_N); +} + +static void rk_edp_set_video_cr_mn(struct rk3288_edp *regs, + enum clock_recovery_m_value_type type, + u32 m_value, + u32 n_value) +{ + if (type == REGISTER_M) { + setbits_le32(®s->sys_ctl_4, FIX_M_VID); + writel(m_value & 0xff, ®s->m_vid_0); + writel((m_value >> 8) & 0xff, ®s->m_vid_1); + writel((m_value >> 16) & 0xff, ®s->m_vid_2); + + writel(n_value & 0xf, ®s->n_vid_0); + writel((n_value >> 8) & 0xff, ®s->n_vid_1); + writel((n_value >> 16) & 0xff, ®s->n_vid_2); + } else { + clrbits_le32(®s->sys_ctl_4, FIX_M_VID); + + writel(0x00, ®s->n_vid_0); + writel(0x80, ®s->n_vid_1); + writel(0x00, ®s->n_vid_2); + } +} + +static int rk_edp_is_video_stream_clock_on(struct rk3288_edp *regs) +{ + ulong start; + u32 val; + + start = get_timer(0); + do { + val = readl(®s->sys_ctl_1); + + /* must write value to update DET_STA bit status */ + writel(val, ®s->sys_ctl_1); + val = readl(®s->sys_ctl_1); + if (!(val & DET_STA)) + continue; + + val = readl(®s->sys_ctl_2); + + /* must write value to update CHA_STA bit status */ + writel(val, ®s->sys_ctl_2); + val = readl(®s->sys_ctl_2); + if (!(val & CHA_STA)) + return 0; + + } while (get_timer(start) < 100); + + return -ETIMEDOUT; +} + +static int rk_edp_is_video_stream_on(struct rk_edp_priv *edp) +{ + ulong start; + u32 val; + + start = get_timer(0); + do { + val = readl(&edp->regs->sys_ctl_3); + + /* must write value to update STRM_VALID bit status */ + writel(val, &edp->regs->sys_ctl_3); + + val = readl(&edp->regs->sys_ctl_3); + if (!(val & STRM_VALID)) + return 0; + } while (get_timer(start) < 100); + + return -ETIMEDOUT; +} + +static int rk_edp_config_video(struct rk_edp_priv *edp) +{ + int ret; + + rk_edp_config_video_slave_mode(edp->regs); + + if (!rk_edp_get_pll_locked(edp->regs)) { + debug("PLL is not locked yet.\n"); + return -ETIMEDOUT; + } + + ret = rk_edp_is_video_stream_clock_on(edp->regs); + if (ret) + return ret; + + /* Set to use the register calculated M/N video */ + rk_edp_set_video_cr_mn(edp->regs, CALCULATED_M, 0, 0); + + /* For video bist, Video timing must be generated by register */ + clrbits_le32(&edp->regs->video_ctl_10, F_SEL); + + /* Disable video mute */ + clrbits_le32(&edp->regs->video_ctl_1, VIDEO_MUTE); + + /* Enable video at next frame */ + setbits_le32(&edp->regs->video_ctl_1, VIDEO_EN); + + return rk_edp_is_video_stream_on(edp); +} + +static void rockchip_edp_force_hpd(struct rk_edp_priv *edp) +{ + setbits_le32(&edp->regs->sys_ctl_3, F_HPD | HPD_CTRL); +} + +static int rockchip_edp_get_plug_in_status(struct rk_edp_priv *edp) +{ + u32 val; + + val = readl(&edp->regs->sys_ctl_3); + if (val & HPD_STATUS) + return 1; + + return 0; +} + +/* + * support edp HPD function + * some hardware version do not support edp hdp, + * we use 200ms to try to get the hpd single now, + * if we can not get edp hpd single, it will delay 200ms, + * also meet the edp power timing request, to compatible + * all of the hardware version + */ +static void rockchip_edp_wait_hpd(struct rk_edp_priv *edp) +{ + ulong start; + + start = get_timer(0); + do { + if (rockchip_edp_get_plug_in_status(edp)) + return; + udelay(100); + } while (get_timer(start) < 200); + + debug("do not get hpd single, force hpd\n"); + rockchip_edp_force_hpd(edp); +} + +static int rk_edp_enable(struct udevice *dev, int panel_bpp, + const struct display_timing *edid) +{ + struct rk_edp_priv *priv = dev_get_priv(dev); + int ret = 0; + + ret = rk_edp_set_link_train(priv); + if (ret) { + printf("link train failed!\n"); + return ret; + } + + rk_edp_init_video(priv->regs); + ret = rk_edp_config_video(priv); + if (ret) { + printf("config video failed\n"); + return ret; + } + ret = panel_enable_backlight(priv->panel); + if (ret) { + debug("%s: backlight error: %d\n", __func__, ret); + return ret; + } + + return 0; +} + +static int rk_edp_read_edid(struct udevice *dev, u8 *buf, int buf_size) +{ + struct rk_edp_priv *priv = dev_get_priv(dev); + u32 edid_size = EDID_LENGTH; + int ret; + int i; + + for (i = 0; i < 3; i++) { + ret = rk_edp_i2c_read(priv->regs, EDID_ADDR, EDID_HEADER, + EDID_LENGTH, &buf[EDID_HEADER]); + if (ret) { + debug("EDID read failed\n"); + continue; + } + + /* + * check if the EDID has an extension flag, and read additional + * EDID data if needed + */ + if (buf[EDID_EXTENSION_FLAG]) { + edid_size += EDID_LENGTH; + ret = rk_edp_i2c_read(priv->regs, EDID_ADDR, + EDID_LENGTH, EDID_LENGTH, + &buf[EDID_LENGTH]); + if (ret) { + debug("EDID Read failed!\n"); + continue; + } + } + goto done; + } + + /* After 3 attempts, give up */ + return ret; + +done: + return edid_size; +} + +static int rk_edp_ofdata_to_platdata(struct udevice *dev) +{ + struct rk_edp_priv *priv = dev_get_priv(dev); + + priv->regs = (struct rk3288_edp *)dev_get_addr(dev); + priv->grf = syscon_get_first_range(ROCKCHIP_SYSCON_GRF); + + return 0; +} + +int rk_edp_probe(struct udevice *dev) +{ + struct display_plat *uc_plat = dev_get_uclass_platdata(dev); + struct rk_edp_priv *priv = dev_get_priv(dev); + struct rk3288_edp *regs = priv->regs; + struct udevice *clk; + int periph; + int ret; + + ret = uclass_get_device_by_phandle(UCLASS_PANEL, dev, "rockchip,panel", + &priv->panel); + if (ret) { + debug("%s: Cannot find panel for '%s' (ret=%d)\n", __func__, + dev->name, ret); + return ret; + } + + int vop_id = uc_plat->source_id; + debug("%s, uc_plat=%p, vop_id=%u\n", __func__, uc_plat, vop_id); + + ret = clk_get_by_index(dev, 1, &clk); + if (ret >= 0) { + periph = ret; + ret = clk_set_periph_rate(clk, periph, 0); + } + if (ret) { + debug("%s: Failed to set EDP clock: ret=%d\n", __func__, ret); + return ret; + } + + ret = clk_get_by_index(uc_plat->src_dev, 0, &clk); + if (ret >= 0) { + periph = ret; + ret = clk_set_periph_rate(clk, periph, 192000000); + } + if (ret < 0) { + debug("%s: Failed to set clock in source device '%s': ret=%d\n", + __func__, uc_plat->src_dev->name, ret); + return ret; + } + + /* grf_edp_ref_clk_sel: from internal 24MHz or 27MHz clock */ + rk_setreg(&priv->grf->soc_con12, 1 << 4); + + /* select epd signal from vop0 or vop1 */ + rk_setreg(&priv->grf->soc_con6, (vop_id == 1) ? (1 << 5) : (1 << 5)); + + rockchip_edp_wait_hpd(priv); + + rk_edp_init_refclk(regs); + rk_edp_init_interrupt(regs); + rk_edp_enable_sw_function(regs); + ret = rk_edp_init_analog_func(regs); + if (ret) + return ret; + rk_edp_init_aux(regs); + + return 0; +} + +static const struct dm_display_ops dp_rockchip_ops = { + .read_edid = rk_edp_read_edid, + .enable = rk_edp_enable, +}; + +static const struct udevice_id rockchip_dp_ids[] = { + { .compatible = "rockchip,rk3288-edp" }, + { } +}; + +U_BOOT_DRIVER(dp_rockchip) = { + .name = "edp_rockchip", + .id = UCLASS_DISPLAY, + .of_match = rockchip_dp_ids, + .ops = &dp_rockchip_ops, + .ofdata_to_platdata = rk_edp_ofdata_to_platdata, + .probe = rk_edp_probe, + .priv_auto_alloc_size = sizeof(struct rk_edp_priv), +}; |