--- /dev/null
+/*
+ * Copyright (C) 2012 Samsung Electronics
+ *
+ * Author: Donghwa Lee <dh09.lee@samsung.com>
+ *
+ * SPDX-License-Identifier: GPL-2.0+
+ */
+
+#include <config.h>
+#include <common.h>
+#include <malloc.h>
+#include <linux/err.h>
+#include <asm/arch/clk.h>
+#include <asm/arch/cpu.h>
+#include <asm/arch/dp_info.h>
+#include <asm/arch/dp.h>
+#include <fdtdec.h>
+#include <libfdt.h>
+
+#include "exynos_dp_lowlevel.h"
+
+DECLARE_GLOBAL_DATA_PTR;
+
+static struct exynos_dp_platform_data *dp_pd;
+
+void __exynos_set_dp_phy(unsigned int onoff)
+{
+}
+void exynos_set_dp_phy(unsigned int onoff)
+ __attribute__((weak, alias("__exynos_set_dp_phy")));
+
+static void exynos_dp_disp_info(struct edp_disp_info *disp_info)
+{
+ disp_info->h_total = disp_info->h_res + disp_info->h_sync_width +
+ disp_info->h_back_porch + disp_info->h_front_porch;
+ disp_info->v_total = disp_info->v_res + disp_info->v_sync_width +
+ disp_info->v_back_porch + disp_info->v_front_porch;
+
+ return;
+}
+
+static int exynos_dp_init_dp(void)
+{
+ int ret;
+ exynos_dp_reset();
+
+ /* SW defined function Normal operation */
+ exynos_dp_enable_sw_func(DP_ENABLE);
+
+ ret = exynos_dp_init_analog_func();
+ if (ret != EXYNOS_DP_SUCCESS)
+ return ret;
+
+ exynos_dp_init_hpd();
+ exynos_dp_init_aux();
+
+ return ret;
+}
+
+static unsigned char exynos_dp_calc_edid_check_sum(unsigned char *edid_data)
+{
+ int i;
+ unsigned char sum = 0;
+
+ for (i = 0; i < EDID_BLOCK_LENGTH; i++)
+ sum = sum + edid_data[i];
+
+ return sum;
+}
+
+static unsigned int exynos_dp_read_edid(void)
+{
+ unsigned char edid[EDID_BLOCK_LENGTH * 2];
+ unsigned int extend_block = 0;
+ unsigned char sum;
+ unsigned char test_vector;
+ int retval;
+
+ /*
+ * EDID device address is 0x50.
+ * However, if necessary, you must have set upper address
+ * into E-EDID in I2C device, 0x30.
+ */
+
+ /* Read Extension Flag, Number of 128-byte EDID extension blocks */
+ exynos_dp_read_byte_from_i2c(I2C_EDID_DEVICE_ADDR, EDID_EXTENSION_FLAG,
+ &extend_block);
+
+ if (extend_block > 0) {
+ printf("DP EDID data includes a single extension!\n");
+
+ /* Read EDID data */
+ retval = exynos_dp_read_bytes_from_i2c(I2C_EDID_DEVICE_ADDR,
+ EDID_HEADER_PATTERN,
+ EDID_BLOCK_LENGTH,
+ &edid[EDID_HEADER_PATTERN]);
+ if (retval != 0) {
+ printf("DP EDID Read failed!\n");
+ return -1;
+ }
+ sum = exynos_dp_calc_edid_check_sum(edid);
+ if (sum != 0) {
+ printf("DP EDID bad checksum!\n");
+ return -1;
+ }
+
+ /* Read additional EDID data */
+ retval = exynos_dp_read_bytes_from_i2c(I2C_EDID_DEVICE_ADDR,
+ EDID_BLOCK_LENGTH,
+ EDID_BLOCK_LENGTH,
+ &edid[EDID_BLOCK_LENGTH]);
+ if (retval != 0) {
+ printf("DP EDID Read failed!\n");
+ return -1;
+ }
+ sum = exynos_dp_calc_edid_check_sum(&edid[EDID_BLOCK_LENGTH]);
+ if (sum != 0) {
+ printf("DP EDID bad checksum!\n");
+ return -1;
+ }
+
+ exynos_dp_read_byte_from_dpcd(DPCD_TEST_REQUEST,
+ &test_vector);
+ if (test_vector & DPCD_TEST_EDID_READ) {
+ exynos_dp_write_byte_to_dpcd(DPCD_TEST_EDID_CHECKSUM,
+ edid[EDID_BLOCK_LENGTH + EDID_CHECKSUM]);
+ exynos_dp_write_byte_to_dpcd(DPCD_TEST_RESPONSE,
+ DPCD_TEST_EDID_CHECKSUM_WRITE);
+ }
+ } else {
+ debug("DP EDID data does not include any extensions.\n");
+
+ /* Read EDID data */
+ retval = exynos_dp_read_bytes_from_i2c(I2C_EDID_DEVICE_ADDR,
+ EDID_HEADER_PATTERN,
+ EDID_BLOCK_LENGTH,
+ &edid[EDID_HEADER_PATTERN]);
+
+ if (retval != 0) {
+ printf("DP EDID Read failed!\n");
+ return -1;
+ }
+ sum = exynos_dp_calc_edid_check_sum(edid);
+ if (sum != 0) {
+ printf("DP EDID bad checksum!\n");
+ return -1;
+ }
+
+ exynos_dp_read_byte_from_dpcd(DPCD_TEST_REQUEST,
+ &test_vector);
+ if (test_vector & DPCD_TEST_EDID_READ) {
+ exynos_dp_write_byte_to_dpcd(DPCD_TEST_EDID_CHECKSUM,
+ edid[EDID_CHECKSUM]);
+ exynos_dp_write_byte_to_dpcd(DPCD_TEST_RESPONSE,
+ DPCD_TEST_EDID_CHECKSUM_WRITE);
+ }
+ }
+
+ debug("DP EDID Read success!\n");
+
+ return 0;
+}
+
+static unsigned int exynos_dp_handle_edid(struct edp_device_info *edp_info)
+{
+ unsigned char buf[12];
+ unsigned int ret;
+ unsigned char temp;
+ unsigned char retry_cnt;
+ unsigned char dpcd_rev[16];
+ unsigned char lane_bw[16];
+ unsigned char lane_cnt[16];
+
+ memset(dpcd_rev, 0, 16);
+ memset(lane_bw, 0, 16);
+ memset(lane_cnt, 0, 16);
+ memset(buf, 0, 12);
+
+ retry_cnt = 5;
+ while (retry_cnt) {
+ /* Read DPCD 0x0000-0x000b */
+ ret = exynos_dp_read_bytes_from_dpcd(DPCD_DPCD_REV, 12,
+ buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ if (retry_cnt == 0) {
+ printf("DP read_byte_from_dpcd() failed\n");
+ return ret;
+ }
+ retry_cnt--;
+ } else
+ break;
+ }
+
+ /* */
+ temp = buf[DPCD_DPCD_REV];
+ if (temp == DP_DPCD_REV_10 || temp == DP_DPCD_REV_11)
+ edp_info->dpcd_rev = temp;
+ else {
+ printf("DP Wrong DPCD Rev : %x\n", temp);
+ return -ENODEV;
+ }
+
+ temp = buf[DPCD_MAX_LINK_RATE];
+ if (temp == DP_LANE_BW_1_62 || temp == DP_LANE_BW_2_70)
+ edp_info->lane_bw = temp;
+ else {
+ printf("DP Wrong MAX LINK RATE : %x\n", temp);
+ return -EINVAL;
+ }
+
+ /*Refer VESA Display Port Stnadard Ver1.1a Page 120 */
+ if (edp_info->dpcd_rev == DP_DPCD_REV_11) {
+ temp = buf[DPCD_MAX_LANE_COUNT] & 0x1f;
+ if (buf[DPCD_MAX_LANE_COUNT] & 0x80)
+ edp_info->dpcd_efc = 1;
+ else
+ edp_info->dpcd_efc = 0;
+ } else {
+ temp = buf[DPCD_MAX_LANE_COUNT];
+ edp_info->dpcd_efc = 0;
+ }
+
+ if (temp == DP_LANE_CNT_1 || temp == DP_LANE_CNT_2 ||
+ temp == DP_LANE_CNT_4) {
+ edp_info->lane_cnt = temp;
+ } else {
+ printf("DP Wrong MAX LANE COUNT : %x\n", temp);
+ return -EINVAL;
+ }
+
+ ret = exynos_dp_read_edid();
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP exynos_dp_read_edid() failed\n");
+ return -EINVAL;
+ }
+
+ return ret;
+}
+
+static void exynos_dp_init_training(void)
+{
+ /*
+ * MACRO_RST must be applied after the PLL_LOCK to avoid
+ * the DP inter pair skew issue for at least 10 us
+ */
+ exynos_dp_reset_macro();
+
+ /* All DP analog module power up */
+ exynos_dp_set_analog_power_down(POWER_ALL, 0);
+}
+
+static unsigned int exynos_dp_link_start(struct edp_device_info *edp_info)
+{
+ unsigned char buf[5];
+ unsigned int ret = 0;
+
+ debug("DP: %s was called\n", __func__);
+
+ edp_info->lt_info.lt_status = DP_LT_CR;
+ edp_info->lt_info.ep_loop = 0;
+ edp_info->lt_info.cr_loop[0] = 0;
+ edp_info->lt_info.cr_loop[1] = 0;
+ edp_info->lt_info.cr_loop[2] = 0;
+ edp_info->lt_info.cr_loop[3] = 0;
+
+ /* Set sink to D0 (Sink Not Ready) mode. */
+ ret = exynos_dp_write_byte_to_dpcd(DPCD_SINK_POWER_STATE,
+ DPCD_SET_POWER_STATE_D0);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write_dpcd_byte failed\n");
+ return ret;
+ }
+
+ /* Set link rate and count as you want to establish*/
+ exynos_dp_set_link_bandwidth(edp_info->lane_bw);
+ exynos_dp_set_lane_count(edp_info->lane_cnt);
+
+ /* Setup RX configuration */
+ buf[0] = edp_info->lane_bw;
+ buf[1] = edp_info->lane_cnt;
+
+ ret = exynos_dp_write_bytes_to_dpcd(DPCD_LINK_BW_SET, 2,
+ buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write_dpcd_byte failed\n");
+ return ret;
+ }
+
+ exynos_dp_set_lane_pre_emphasis(PRE_EMPHASIS_LEVEL_0,
+ edp_info->lane_cnt);
+
+ /* Set training pattern 1 */
+ exynos_dp_set_training_pattern(TRAINING_PTN1);
+
+ /* Set RX training pattern */
+ buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_1;
+
+ buf[1] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
+ DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
+ buf[2] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
+ DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
+ buf[3] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
+ DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
+ buf[4] = DPCD_PRE_EMPHASIS_SET_PATTERN_2_LEVEL_0 |
+ DPCD_VOLTAGE_SWING_SET_PATTERN_1_LEVEL_0;
+
+ ret = exynos_dp_write_bytes_to_dpcd(DPCD_TRAINING_PATTERN_SET,
+ 5, buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write_dpcd_byte failed\n");
+ return ret;
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_training_pattern_dis(void)
+{
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+
+ exynos_dp_set_training_pattern(DP_NONE);
+
+ ret = exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
+ DPCD_TRAINING_PATTERN_DISABLED);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP requst_link_traninig_req failed\n");
+ return -EAGAIN;
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_enable_rx_to_enhanced_mode(unsigned char enable)
+{
+ unsigned char data;
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+
+ ret = exynos_dp_read_byte_from_dpcd(DPCD_LANE_COUNT_SET,
+ &data);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read_from_dpcd failed\n");
+ return -EAGAIN;
+ }
+
+ if (enable)
+ data = DPCD_ENHANCED_FRAME_EN | DPCD_LN_COUNT_SET(data);
+ else
+ data = DPCD_LN_COUNT_SET(data);
+
+ ret = exynos_dp_write_byte_to_dpcd(DPCD_LANE_COUNT_SET,
+ data);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write_to_dpcd failed\n");
+ return -EAGAIN;
+
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_set_enhanced_mode(unsigned char enhance_mode)
+{
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+
+ ret = exynos_dp_enable_rx_to_enhanced_mode(enhance_mode);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP rx_enhance_mode failed\n");
+ return -EAGAIN;
+ }
+
+ exynos_dp_enable_enhanced_mode(enhance_mode);
+
+ return ret;
+}
+
+static int exynos_dp_read_dpcd_lane_stat(struct edp_device_info *edp_info,
+ unsigned char *status)
+{
+ unsigned int ret, i;
+ unsigned char buf[2];
+ unsigned char lane_stat[DP_LANE_CNT_4] = {0,};
+ unsigned char shift_val[DP_LANE_CNT_4] = {0,};
+
+ shift_val[0] = 0;
+ shift_val[1] = 4;
+ shift_val[2] = 0;
+ shift_val[3] = 4;
+
+ ret = exynos_dp_read_bytes_from_dpcd(DPCD_LANE0_1_STATUS, 2, buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read lane status failed\n");
+ return ret;
+ }
+
+ for (i = 0; i < edp_info->lane_cnt; i++) {
+ lane_stat[i] = (buf[(i / 2)] >> shift_val[i]) & 0x0f;
+ if (lane_stat[0] != lane_stat[i]) {
+ printf("Wrong lane status\n");
+ return -EINVAL;
+ }
+ }
+
+ *status = lane_stat[0];
+
+ return ret;
+}
+
+static unsigned int exynos_dp_read_dpcd_adj_req(unsigned char lane_num,
+ unsigned char *sw, unsigned char *em)
+{
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+ unsigned char buf;
+ unsigned int dpcd_addr;
+ unsigned char shift_val[DP_LANE_CNT_4] = {0, 4, 0, 4};
+
+ /*lane_num value is used as arry index, so this range 0 ~ 3 */
+ dpcd_addr = DPCD_ADJUST_REQUEST_LANE0_1 + (lane_num / 2);
+
+ ret = exynos_dp_read_byte_from_dpcd(dpcd_addr, &buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read adjust request failed\n");
+ return -EAGAIN;
+ }
+
+ *sw = ((buf >> shift_val[lane_num]) & 0x03);
+ *em = ((buf >> shift_val[lane_num]) & 0x0c) >> 2;
+
+ return ret;
+}
+
+static int exynos_dp_equalizer_err_link(struct edp_device_info *edp_info)
+{
+ int ret;
+
+ ret = exynos_dp_training_pattern_dis();
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP training_patter_disable() failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ }
+
+ ret = exynos_dp_set_enhanced_mode(edp_info->dpcd_efc);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP set_enhanced_mode() failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ }
+
+ return ret;
+}
+
+static int exynos_dp_reduce_link_rate(struct edp_device_info *edp_info)
+{
+ int ret;
+
+ if (edp_info->lane_bw == DP_LANE_BW_2_70) {
+ edp_info->lane_bw = DP_LANE_BW_1_62;
+ printf("DP Change lane bw to 1.62Gbps\n");
+ edp_info->lt_info.lt_status = DP_LT_START;
+ ret = EXYNOS_DP_SUCCESS;
+ } else {
+ ret = exynos_dp_training_pattern_dis();
+ if (ret != EXYNOS_DP_SUCCESS)
+ printf("DP training_patter_disable() failed\n");
+
+ ret = exynos_dp_set_enhanced_mode(edp_info->dpcd_efc);
+ if (ret != EXYNOS_DP_SUCCESS)
+ printf("DP set_enhanced_mode() failed\n");
+
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_process_clock_recovery(struct edp_device_info
+ *edp_info)
+{
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+ unsigned char lane_stat;
+ unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0, };
+ unsigned int i;
+ unsigned char adj_req_sw;
+ unsigned char adj_req_em;
+ unsigned char buf[5];
+
+ debug("DP: %s was called\n", __func__);
+ mdelay(1);
+
+ ret = exynos_dp_read_dpcd_lane_stat(edp_info, &lane_stat);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read lane status failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ }
+
+ if (lane_stat & DP_LANE_STAT_CR_DONE) {
+ debug("DP clock Recovery training succeed\n");
+ exynos_dp_set_training_pattern(TRAINING_PTN2);
+
+ for (i = 0; i < edp_info->lane_cnt; i++) {
+ ret = exynos_dp_read_dpcd_adj_req(i, &adj_req_sw,
+ &adj_req_em);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ }
+
+ lt_ctl_val[i] = 0;
+ lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
+
+ if ((adj_req_sw == VOLTAGE_LEVEL_3)
+ || (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
+ lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
+ MAX_PRE_EMPHASIS_REACH_3;
+ }
+ exynos_dp_set_lanex_pre_emphasis(lt_ctl_val[i], i);
+ }
+
+ buf[0] = DPCD_SCRAMBLING_DISABLED | DPCD_TRAINING_PATTERN_2;
+ buf[1] = lt_ctl_val[0];
+ buf[2] = lt_ctl_val[1];
+ buf[3] = lt_ctl_val[2];
+ buf[4] = lt_ctl_val[3];
+
+ ret = exynos_dp_write_bytes_to_dpcd(
+ DPCD_TRAINING_PATTERN_SET, 5, buf);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write traning pattern1 failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ } else
+ edp_info->lt_info.lt_status = DP_LT_ET;
+ } else {
+ for (i = 0; i < edp_info->lane_cnt; i++) {
+ lt_ctl_val[i] = exynos_dp_get_lanex_pre_emphasis(i);
+ ret = exynos_dp_read_dpcd_adj_req(i,
+ &adj_req_sw, &adj_req_em);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read adj req failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ }
+
+ if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
+ (adj_req_em == PRE_EMPHASIS_LEVEL_3))
+ ret = exynos_dp_reduce_link_rate(edp_info);
+
+ if ((DRIVE_CURRENT_SET_0_GET(lt_ctl_val[i]) ==
+ adj_req_sw) &&
+ (PRE_EMPHASIS_SET_0_GET(lt_ctl_val[i]) ==
+ adj_req_em)) {
+ edp_info->lt_info.cr_loop[i]++;
+ if (edp_info->lt_info.cr_loop[i] == MAX_CR_LOOP)
+ ret = exynos_dp_reduce_link_rate(
+ edp_info);
+ }
+
+ lt_ctl_val[i] = 0;
+ lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
+
+ if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
+ (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
+ lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3 |
+ MAX_PRE_EMPHASIS_REACH_3;
+ }
+ exynos_dp_set_lanex_pre_emphasis(lt_ctl_val[i], i);
+ }
+
+ ret = exynos_dp_write_bytes_to_dpcd(
+ DPCD_TRAINING_LANE0_SET, 4, lt_ctl_val);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP write traning pattern2 failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ }
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_process_equalizer_training(struct edp_device_info
+ *edp_info)
+{
+ unsigned int ret = EXYNOS_DP_SUCCESS;
+ unsigned char lane_stat, adj_req_sw, adj_req_em, i;
+ unsigned char lt_ctl_val[DP_LANE_CNT_4] = {0,};
+ unsigned char interlane_aligned = 0;
+ unsigned char f_bw;
+ unsigned char f_lane_cnt;
+ unsigned char sink_stat;
+
+ mdelay(1);
+
+ ret = exynos_dp_read_dpcd_lane_stat(edp_info, &lane_stat);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read lane status failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ return ret;
+ }
+
+ debug("DP lane stat : %x\n", lane_stat);
+
+ if (lane_stat & DP_LANE_STAT_CR_DONE) {
+ ret = exynos_dp_read_byte_from_dpcd(DPCD_LN_ALIGN_UPDATED,
+ &sink_stat);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+
+ return ret;
+ }
+
+ interlane_aligned = (sink_stat & DPCD_INTERLANE_ALIGN_DONE);
+
+ for (i = 0; i < edp_info->lane_cnt; i++) {
+ ret = exynos_dp_read_dpcd_adj_req(i,
+ &adj_req_sw, &adj_req_em);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP read adj req 1 failed\n");
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+
+ return ret;
+ }
+
+ lt_ctl_val[i] = 0;
+ lt_ctl_val[i] = adj_req_em << 3 | adj_req_sw;
+
+ if ((adj_req_sw == VOLTAGE_LEVEL_3) ||
+ (adj_req_em == PRE_EMPHASIS_LEVEL_3)) {
+ lt_ctl_val[i] |= MAX_DRIVE_CURRENT_REACH_3;
+ lt_ctl_val[i] |= MAX_PRE_EMPHASIS_REACH_3;
+ }
+ }
+
+ if (((lane_stat&DP_LANE_STAT_CE_DONE) &&
+ (lane_stat&DP_LANE_STAT_SYM_LOCK))
+ && (interlane_aligned == DPCD_INTERLANE_ALIGN_DONE)) {
+ debug("DP Equalizer training succeed\n");
+
+ f_bw = exynos_dp_get_link_bandwidth();
+ f_lane_cnt = exynos_dp_get_lane_count();
+
+ debug("DP final BandWidth : %x\n", f_bw);
+ debug("DP final Lane Count : %x\n", f_lane_cnt);
+
+ edp_info->lt_info.lt_status = DP_LT_FINISHED;
+
+ exynos_dp_equalizer_err_link(edp_info);
+
+ } else {
+ edp_info->lt_info.ep_loop++;
+
+ if (edp_info->lt_info.ep_loop > MAX_EQ_LOOP) {
+ if (edp_info->lane_bw == DP_LANE_BW_2_70) {
+ ret = exynos_dp_reduce_link_rate(
+ edp_info);
+ } else {
+ edp_info->lt_info.lt_status =
+ DP_LT_FAIL;
+ exynos_dp_equalizer_err_link(edp_info);
+ }
+ } else {
+ for (i = 0; i < edp_info->lane_cnt; i++)
+ exynos_dp_set_lanex_pre_emphasis(
+ lt_ctl_val[i], i);
+
+ ret = exynos_dp_write_bytes_to_dpcd(
+ DPCD_TRAINING_LANE0_SET,
+ 4, lt_ctl_val);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP set lt pattern failed\n");
+ edp_info->lt_info.lt_status =
+ DP_LT_FAIL;
+ exynos_dp_equalizer_err_link(edp_info);
+ }
+ }
+ }
+ } else if (edp_info->lane_bw == DP_LANE_BW_2_70) {
+ ret = exynos_dp_reduce_link_rate(edp_info);
+ } else {
+ edp_info->lt_info.lt_status = DP_LT_FAIL;
+ exynos_dp_equalizer_err_link(edp_info);
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_sw_link_training(struct edp_device_info *edp_info)
+{
+ unsigned int ret = 0;
+ int training_finished;
+
+ /* Turn off unnecessary lane */
+ if (edp_info->lane_cnt == 1)
+ exynos_dp_set_analog_power_down(CH1_BLOCK, 1);
+
+ training_finished = 0;
+
+ edp_info->lt_info.lt_status = DP_LT_START;
+
+ /* Process here */
+ while (!training_finished) {
+ switch (edp_info->lt_info.lt_status) {
+ case DP_LT_START:
+ ret = exynos_dp_link_start(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP LT:link start failed\n");
+ return ret;
+ }
+ break;
+ case DP_LT_CR:
+ ret = exynos_dp_process_clock_recovery(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP LT:clock recovery failed\n");
+ return ret;
+ }
+ break;
+ case DP_LT_ET:
+ ret = exynos_dp_process_equalizer_training(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP LT:equalizer training failed\n");
+ return ret;
+ }
+ break;
+ case DP_LT_FINISHED:
+ training_finished = 1;
+ break;
+ case DP_LT_FAIL:
+ return -1;
+ }
+ }
+
+ return ret;
+}
+
+static unsigned int exynos_dp_set_link_train(struct edp_device_info *edp_info)
+{
+ unsigned int ret;
+
+ exynos_dp_init_training();
+
+ ret = exynos_dp_sw_link_training(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS)
+ printf("DP dp_sw_link_traning() failed\n");
+
+ return ret;
+}
+
+static void exynos_dp_enable_scramble(unsigned int enable)
+{
+ unsigned char data;
+
+ if (enable) {
+ exynos_dp_enable_scrambling(DP_ENABLE);
+
+ exynos_dp_read_byte_from_dpcd(DPCD_TRAINING_PATTERN_SET,
+ &data);
+ exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
+ (u8)(data & ~DPCD_SCRAMBLING_DISABLED));
+ } else {
+ exynos_dp_enable_scrambling(DP_DISABLE);
+ exynos_dp_read_byte_from_dpcd(DPCD_TRAINING_PATTERN_SET,
+ &data);
+ exynos_dp_write_byte_to_dpcd(DPCD_TRAINING_PATTERN_SET,
+ (u8)(data | DPCD_SCRAMBLING_DISABLED));
+ }
+}
+
+static unsigned int exynos_dp_config_video(struct edp_device_info *edp_info)
+{
+ unsigned int ret = 0;
+ unsigned int retry_cnt;
+
+ mdelay(1);
+
+ if (edp_info->video_info.master_mode) {
+ printf("DP does not support master mode\n");
+ return -ENODEV;
+ } else {
+ /* debug slave */
+ exynos_dp_config_video_slave_mode(&edp_info->video_info);
+ }
+
+ exynos_dp_set_video_color_format(&edp_info->video_info);
+
+ if (edp_info->video_info.bist_mode) {
+ if (exynos_dp_config_video_bist(edp_info) != 0)
+ return -1;
+ }
+
+ ret = exynos_dp_get_pll_lock_status();
+ if (ret != PLL_LOCKED) {
+ printf("DP PLL is not locked yet\n");
+ return -EIO;
+ }
+
+ if (edp_info->video_info.master_mode == 0) {
+ retry_cnt = 10;
+ while (retry_cnt) {
+ ret = exynos_dp_is_slave_video_stream_clock_on();
+ if (ret != EXYNOS_DP_SUCCESS) {
+ if (retry_cnt == 0) {
+ printf("DP stream_clock_on failed\n");
+ return ret;
+ }
+ retry_cnt--;
+ mdelay(1);
+ } else
+ break;
+ }
+ }
+
+ /* Set to use the register calculated M/N video */
+ exynos_dp_set_video_cr_mn(CALCULATED_M, 0, 0);
+
+ /* For video bist, Video timing must be generated by register */
+ exynos_dp_set_video_timing_mode(VIDEO_TIMING_FROM_CAPTURE);
+
+ /* Enable video bist */
+ if (edp_info->video_info.bist_pattern != COLOR_RAMP &&
+ edp_info->video_info.bist_pattern != BALCK_WHITE_V_LINES &&
+ edp_info->video_info.bist_pattern != COLOR_SQUARE)
+ exynos_dp_enable_video_bist(edp_info->video_info.bist_mode);
+ else
+ exynos_dp_enable_video_bist(DP_DISABLE);
+
+ /* Disable video mute */
+ exynos_dp_enable_video_mute(DP_DISABLE);
+
+ /* Configure video Master or Slave mode */
+ exynos_dp_enable_video_master(edp_info->video_info.master_mode);
+
+ /* Enable video */
+ exynos_dp_start_video();
+
+ if (edp_info->video_info.master_mode == 0) {
+ retry_cnt = 100;
+ while (retry_cnt) {
+ ret = exynos_dp_is_video_stream_on();
+ if (ret != EXYNOS_DP_SUCCESS) {
+ if (retry_cnt == 0) {
+ printf("DP Timeout of video stream\n");
+ return ret;
+ }
+ retry_cnt--;
+ mdelay(5);
+ } else
+ break;
+ }
+ }
+
+ return ret;
+}
+
+#ifdef CONFIG_OF_CONTROL
+int exynos_dp_parse_dt(const void *blob, struct edp_device_info *edp_info)
+{
+ unsigned int node = fdtdec_next_compatible(blob, 0,
+ COMPAT_SAMSUNG_EXYNOS5_DP);
+ if (node <= 0) {
+ debug("exynos_dp: Can't get device node for dp\n");
+ return -ENODEV;
+ }
+
+ edp_info->disp_info.h_res = fdtdec_get_int(blob, node,
+ "samsung,h-res", 0);
+ edp_info->disp_info.h_sync_width = fdtdec_get_int(blob, node,
+ "samsung,h-sync-width", 0);
+ edp_info->disp_info.h_back_porch = fdtdec_get_int(blob, node,
+ "samsung,h-back-porch", 0);
+ edp_info->disp_info.h_front_porch = fdtdec_get_int(blob, node,
+ "samsung,h-front-porch", 0);
+ edp_info->disp_info.v_res = fdtdec_get_int(blob, node,
+ "samsung,v-res", 0);
+ edp_info->disp_info.v_sync_width = fdtdec_get_int(blob, node,
+ "samsung,v-sync-width", 0);
+ edp_info->disp_info.v_back_porch = fdtdec_get_int(blob, node,
+ "samsung,v-back-porch", 0);
+ edp_info->disp_info.v_front_porch = fdtdec_get_int(blob, node,
+ "samsung,v-front-porch", 0);
+ edp_info->disp_info.v_sync_rate = fdtdec_get_int(blob, node,
+ "samsung,v-sync-rate", 0);
+
+ edp_info->lt_info.lt_status = fdtdec_get_int(blob, node,
+ "samsung,lt-status", 0);
+
+ edp_info->video_info.master_mode = fdtdec_get_int(blob, node,
+ "samsung,master-mode", 0);
+ edp_info->video_info.bist_mode = fdtdec_get_int(blob, node,
+ "samsung,bist-mode", 0);
+ edp_info->video_info.bist_pattern = fdtdec_get_int(blob, node,
+ "samsung,bist-pattern", 0);
+ edp_info->video_info.h_sync_polarity = fdtdec_get_int(blob, node,
+ "samsung,h-sync-polarity", 0);
+ edp_info->video_info.v_sync_polarity = fdtdec_get_int(blob, node,
+ "samsung,v-sync-polarity", 0);
+ edp_info->video_info.interlaced = fdtdec_get_int(blob, node,
+ "samsung,interlaced", 0);
+ edp_info->video_info.color_space = fdtdec_get_int(blob, node,
+ "samsung,color-space", 0);
+ edp_info->video_info.dynamic_range = fdtdec_get_int(blob, node,
+ "samsung,dynamic-range", 0);
+ edp_info->video_info.ycbcr_coeff = fdtdec_get_int(blob, node,
+ "samsung,ycbcr-coeff", 0);
+ edp_info->video_info.color_depth = fdtdec_get_int(blob, node,
+ "samsung,color-depth", 0);
+ return 0;
+}
+#endif
+
+unsigned int exynos_init_dp(void)
+{
+ unsigned int ret;
+ struct edp_device_info *edp_info;
+
+ edp_info = kzalloc(sizeof(struct edp_device_info), GFP_KERNEL);
+ if (!edp_info) {
+ debug("failed to allocate edp device object.\n");
+ return -EFAULT;
+ }
+
+#ifdef CONFIG_OF_CONTROL
+ if (exynos_dp_parse_dt(gd->fdt_blob, edp_info))
+ debug("unable to parse DP DT node\n");
+#else
+ edp_info = dp_pd->edp_dev_info;
+ if (edp_info == NULL) {
+ debug("failed to get edp_info data.\n");
+ return -EFAULT;
+ }
+#endif
+
+ exynos_dp_set_base_addr();
+
+ exynos_dp_disp_info(&edp_info->disp_info);
+
+ exynos_set_dp_phy(1);
+
+ ret = exynos_dp_init_dp();
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP exynos_dp_init_dp() failed\n");
+ return ret;
+ }
+
+ ret = exynos_dp_handle_edid(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("EDP handle_edid fail\n");
+ return ret;
+ }
+
+ ret = exynos_dp_set_link_train(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("DP link training fail\n");
+ return ret;
+ }
+
+ exynos_dp_enable_scramble(DP_ENABLE);
+ exynos_dp_enable_rx_to_enhanced_mode(DP_ENABLE);
+ exynos_dp_enable_enhanced_mode(DP_ENABLE);
+
+ exynos_dp_set_link_bandwidth(edp_info->lane_bw);
+ exynos_dp_set_lane_count(edp_info->lane_cnt);
+
+ exynos_dp_init_video();
+ ret = exynos_dp_config_video(edp_info);
+ if (ret != EXYNOS_DP_SUCCESS) {
+ printf("Exynos DP init failed\n");
+ return ret;
+ }
+
+ printf("Exynos DP init done\n");
+
+ return ret;
+}
+
+void exynos_set_dp_platform_data(struct exynos_dp_platform_data *pd)
+{
+ if (pd == NULL) {
+ debug("pd is NULL\n");
+ return;
+ }
+
+ dp_pd = pd;
+}
Code Review / kvmfornfv.git / blobdiff