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authorLin Huang <hl@rock-chips.com>2016-04-25 18:50:55 +0800
committerPatrick Georgi <pgeorgi@google.com>2016-05-09 08:48:35 +0200
commitb9a7877568cf7441cef7879c9948c8c3a8895a60 (patch)
tree89e4b35fce0fd7c1e8129e751a577facaad82c80 /src/soc/rockchip/common/edp.c
parentf9cbe353193a506fb687f137ddd7b082b0da5a49 (diff)
downloadcoreboot-b9a7877568cf7441cef7879c9948c8c3a8895a60.tar.xz
rockchip/*: refactor edp driver
rk3288 and rk3399 use same edp IP, move soc specific setting to soc/display, and move edp driver to common, so rk3399 can reuse this driver. BUG=chrome-os-partner:52460 BRANCH=none TEST= test on jerry and mighty, edp panel can work Change-Id: Ie3f3e8468b2323994af8a002413bf93b3edc8026 Signed-off-by: Patrick Georgi <pgeorgi@chromium.org> Original-Commit-Id: 64bb4b2c7ed373d9730c9aa0b0896a32164fc7ee Original-Change-Id: Ie5c15a81849a02d1c0457e36ed00fbe2d47961fb Original-Signed-off-by: Lin Huang <hl@rock-chips.com> Original-Reviewed-on: https://chromium-review.googlesource.com/340504 Original-Commit-Ready: Vadim Bendebury <vbendeb@chromium.org> Original-Tested-by: Vadim Bendebury <vbendeb@chromium.org> Original-Reviewed-by: Julius Werner <jwerner@chromium.org> Reviewed-on: https://review.coreboot.org/14725 Tested-by: build bot (Jenkins) Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/soc/rockchip/common/edp.c')
-rw-r--r--src/soc/rockchip/common/edp.c1016
1 files changed, 1016 insertions, 0 deletions
diff --git a/src/soc/rockchip/common/edp.c b/src/soc/rockchip/common/edp.c
new file mode 100644
index 0000000000..90bc6e7a33
--- /dev/null
+++ b/src/soc/rockchip/common/edp.c
@@ -0,0 +1,1016 @@
+/*
+ * This file is part of the coreboot project.
+ *
+ * Copyright 2014 Rockchip Inc.
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; version 2 of the License.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ */
+
+#include <arch/io.h>
+#include <assert.h>
+#include <console/console.h>
+#include <delay.h>
+#include <device/device.h>
+#include <edid.h>
+#include <stdlib.h>
+#include <stdint.h>
+#include <string.h>
+#include <soc/addressmap.h>
+#include <soc/display.h>
+#include <soc/edp.h>
+#include <timer.h>
+
+#define edp_debug(x...) do {if (0) printk(BIOS_DEBUG, x); } while (0)
+
+static struct rk_edp rk_edp;
+
+#define MAX_CR_LOOP 5
+#define MAX_EQ_LOOP 5
+#define DP_LINK_STATUS_SIZE 6
+
+static const char *voltage_names[] = {
+ "0.4V", "0.6V", "0.8V", "1.2V"
+};
+static const char *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
+
+static void rk_edp_init_refclk(struct rk_edp *edp)
+{
+ write32(&edp->regs->analog_ctl_2, SEL_24M);
+ write32(&edp->regs->pll_reg_1, REF_CLK_24M);
+
+ /*initial value*/
+ write32(&edp->regs->pll_reg_2, LDO_OUTPUT_V_SEL_145 | KVCO_DEFALUT |
+ CHG_PUMP_CUR_SEL_5US | V2L_CUR_SEL_1MA);
+
+ write32(&edp->regs->pll_reg_3, LOCK_DET_CNT_SEL_256 |
+ LOOP_FILTER_RESET | PALL_SSC_RESET | LOCK_DET_BYPASS |
+ PLL_LOCK_DET_MODE | PLL_LOCK_DET_FORCE);
+
+ write32(&edp->regs->pll_reg_5, REGULATOR_V_SEL_950MV | STANDBY_CUR_SEL |
+ CHG_PUMP_INOUT_CTRL_1200MV | CHG_PUMP_INPUT_CTRL_OP);
+
+ write32(&edp->regs->ssc_reg, SSC_OFFSET | SSC_MODE | SSC_DEPTH);
+
+ write32(&edp->regs->tx_common, TX_SWING_PRE_EMP_MODE |
+ PRE_DRIVER_PW_CTRL1 | LP_MODE_CLK_REGULATOR |
+ RESISTOR_MSB_CTRL | RESISTOR_CTRL);
+
+ write32(&edp->regs->dp_aux, DP_AUX_COMMON_MODE |
+ DP_AUX_EN | AUX_TERM_50OHM);
+
+ write32(&edp->regs->dp_bias, DP_BG_OUT_SEL | DP_DB_CUR_CTRL |
+ DP_BG_SEL | DP_RESISTOR_TUNE_BG);
+
+ write32(&edp->regs->dp_reserv2,
+ CH1_CH3_SWING_EMP_CTRL | CH0_CH2_SWING_EMP_CTRL);
+}
+
+static void rk_edp_init_interrupt(struct rk_edp *edp)
+{
+ /* Set interrupt pin assertion polarity as high */
+ write32(&edp->regs->int_ctl, INT_POL);
+
+ /* Clear pending registers */
+ write32(&edp->regs->common_int_sta_1, 0xff);
+ write32(&edp->regs->common_int_sta_2, 0x4f);
+ write32(&edp->regs->common_int_sta_3, 0xff);
+ write32(&edp->regs->common_int_sta_4, 0x27);
+ write32(&edp->regs->dp_int_sta, 0x7f);
+
+ /* 0:mask,1: unmask */
+ write32(&edp->regs->common_int_mask_1, 0x00);
+ write32(&edp->regs->common_int_mask_2, 0x00);
+ write32(&edp->regs->common_int_mask_3, 0x00);
+ write32(&edp->regs->common_int_mask_4, 0x00);
+ write32(&edp->regs->int_sta_mask, 0x00);
+}
+
+static void rk_edp_enable_sw_function(struct rk_edp *edp)
+{
+ clrbits_le32(&edp->regs->func_en_1, SW_FUNC_EN_N);
+}
+
+static int rk_edp_get_pll_lock_status(struct rk_edp *edp)
+{
+ u32 val;
+
+ val = read32(&edp->regs->dp_debug_ctl);
+ return (val & PLL_LOCK) ? DP_PLL_LOCKED : DP_PLL_UNLOCKED;
+}
+
+static void rk_edp_init_analog_func(struct rk_edp *edp)
+{
+ struct stopwatch sw;
+
+ write32(&edp->regs->dp_pd, 0x00);
+
+ write32(&edp->regs->common_int_sta_1, PLL_LOCK_CHG);
+
+ clrbits_le32(&edp->regs->dp_debug_ctl, F_PLL_LOCK | PLL_LOCK_CTRL);
+
+ stopwatch_init_msecs_expire(&sw, PLL_LOCK_TIMEOUT);
+
+ while (rk_edp_get_pll_lock_status(edp) == DP_PLL_UNLOCKED) {
+ if (stopwatch_expired(&sw)) {
+ printk(BIOS_ERR, "%s: PLL is not locked\n", __func__);
+ return;
+ }
+ }
+
+ /* Enable Serdes FIFO function and Link symbol clock domain module */
+ clrbits_le32(&edp->regs->func_en_2, SERDES_FIFO_FUNC_EN_N |
+ LS_CLK_DOMAIN_FUNC_EN_N | AUX_FUNC_EN_N |
+ SSC_FUNC_EN_N);
+}
+
+static void rk_edp_init_aux(struct rk_edp *edp)
+{
+ /* Clear inerrupts related to AUX channel */
+ write32(&edp->regs->dp_int_sta, AUX_FUNC_EN_N);
+
+ /* Disable AUX channel module */
+ setbits_le32(&edp->regs->func_en_2, AUX_FUNC_EN_N);
+
+ /* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */
+ write32(&edp->regs->aux_ch_defer_dtl, DEFER_CTRL_EN | DEFER_COUNT(1));
+
+ /* Enable AUX channel module */
+ clrbits_le32(&edp->regs->func_en_2, AUX_FUNC_EN_N);
+}
+
+static int rk_edp_aux_enable(struct rk_edp *edp)
+{
+ struct stopwatch sw;
+
+ setbits_le32(&edp->regs->aux_ch_ctl_2, AUX_EN);
+ stopwatch_init_msecs_expire(&sw, 20);
+ do {
+ if (!(read32(&edp->regs->aux_ch_ctl_2) & AUX_EN))
+ return 0;
+ } while (!stopwatch_expired(&sw));
+
+ return -1;
+
+}
+
+static int rk_edp_is_aux_reply(struct rk_edp *edp)
+{
+ struct stopwatch sw;
+
+ stopwatch_init_msecs_expire(&sw, 10);
+
+ while (!(read32(&edp->regs->dp_int_sta) & RPLY_RECEIV)) {
+ if (stopwatch_expired(&sw))
+ return -1;
+ }
+
+ write32(&edp->regs->dp_int_sta, RPLY_RECEIV);
+
+ return 0;
+}
+
+static int rk_edp_start_aux_transaction(struct rk_edp *edp)
+{
+ int val;
+
+ /* Enable AUX CH operation */
+ if (rk_edp_aux_enable(edp)) {
+ edp_debug("AUX CH enable timeout!\n");
+ return -1;
+ }
+
+ /* Is AUX CH command reply received? */
+ if (rk_edp_is_aux_reply(edp)) {
+ edp_debug("AUX CH command reply failed!\n");
+ return -1;
+ }
+
+ /* Clear interrupt source for AUX CH access error */
+ val = read32(&edp->regs->dp_int_sta);
+ if (val & AUX_ERR) {
+ write32(&edp->regs->dp_int_sta, AUX_ERR);
+ return -1;
+ }
+
+ /* Check AUX CH error access status */
+ val = read32(&edp->regs->dp_int_sta);
+ if ((val & AUX_STATUS_MASK) != 0) {
+ edp_debug("AUX CH error happens: %d\n\n",
+ val & AUX_STATUS_MASK);
+ return -1;
+ }
+
+ return 0;
+}
+
+static int rk_edp_dpcd_transfer(struct rk_edp *edp,
+ unsigned int val_addr, u8 *data,
+ unsigned int length,
+ enum dpcd_request request)
+{
+ int val;
+ int i, try_times;
+ int retval = 0;
+ u32 len = 0;
+
+ while (length) {
+ len = MIN(length, 16);
+ for (try_times = 0; try_times < 10; try_times++) {
+
+ /* Clear AUX CH data buffer */
+ val = BUF_CLR;
+ write32(&edp->regs->buf_data_ctl, val);
+
+ /* Select DPCD device address */
+ val = AUX_ADDR_7_0(val_addr);
+ write32(&edp->regs->aux_addr_7_0, val);
+ val = AUX_ADDR_15_8(val_addr);
+ write32(&edp->regs->aux_addr_15_8, val);
+ val = AUX_ADDR_19_16(val_addr);
+ write32(&edp->regs->aux_addr_19_16, val);
+
+ /*
+ * 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++)
+ write32(&edp->regs->buf_data[i],
+ *data++);
+ } else
+ val = AUX_LENGTH(len) |
+ AUX_TX_COMM_DP_TRANSACTION |
+ AUX_TX_COMM_READ;
+
+ write32(&edp->regs->aux_ch_ctl_1, val);
+
+ /* Start AUX transaction */
+ retval = rk_edp_start_aux_transaction(edp);
+ if (retval == 0)
+ break;
+ else
+ printk(BIOS_WARNING, "read dpcd Aux Transaction fail!\n");
+
+ }
+
+ if (retval)
+ return -1;
+
+ if (request == DPCD_READ) {
+ for (i = 0; i < len; i++)
+ *data++ = (u8)read32(&edp->regs->buf_data[i]);
+ }
+
+ length -= len;
+ val_addr += 16;
+ }
+ return 0;
+}
+
+static int rk_edp_dpcd_read(struct rk_edp *edp, u32 addr,
+ u8 *values, size_t size)
+{
+ return rk_edp_dpcd_transfer(edp, addr, values, size, DPCD_READ);
+}
+
+static int rk_edp_dpcd_write(struct rk_edp *edp, u32 addr,
+ u8 *values, size_t size)
+{
+ return rk_edp_dpcd_transfer(edp, addr, values, size, DPCD_WRITE);
+}
+
+
+static int rk_edp_link_power_up(struct rk_edp *edp)
+{
+ u8 value;
+ int err;
+
+ /* DP_SET_POWER register is only available on DPCD v1.1 and later */
+ if (edp->link_train.revision < 0x11)
+ return 0;
+
+ err = rk_edp_dpcd_read(edp, DPCD_LINK_POWER_STATE, &value, 1);
+ if (err < 0)
+ return err;
+
+ value &= ~DP_SET_POWER_MASK;
+ value |= DP_SET_POWER_D0;
+
+ err = rk_edp_dpcd_write(edp, DPCD_LINK_POWER_STATE, &value, 1);
+ if (err < 0)
+ return err;
+
+ /*
+ * 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 *edp)
+{
+ u8 values[2];
+
+ values[0] = edp->link_train.link_rate;
+ values[1] = edp->link_train.lane_count;
+
+ return rk_edp_dpcd_write(edp, DPCD_LINK_BW_SET, values, sizeof(values));
+}
+
+static void rk_edp_set_link_training(struct rk_edp *edp,
+ const u8 *training_values)
+{
+ int i;
+
+ for (i = 0; i < edp->link_train.lane_count; i++)
+ write32(&edp->regs->ln_link_trn_ctl[i], training_values[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 *edp, u8 *link_status)
+{
+ return rk_edp_dpcd_read(edp, 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_ok(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 0;
+ }
+ return 1;
+}
+
+static int rk_edp_channel_eq_ok(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) == 0)
+ return 0;
+ 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 0;
+ }
+ return 1;
+}
+
+static u8
+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 u8 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[])
+{
+ u8 v = 0;
+ u8 p = 0;
+ int lane;
+
+ for (lane = 0; lane < lane_count; lane++) {
+ u8 this_v =
+ rk_edp_get_adjust_request_voltage(link_status, lane);
+ u8 this_p =
+ rk_edp_get_adjust_request_pre_emphasis(link_status,
+ lane);
+
+ printk(BIOS_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;
+
+ printk(BIOS_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 *edp)
+{
+ int clock_recovery;
+ u8 voltage, tries = 0;
+ u8 status[DP_LINK_STATUS_SIZE];
+ int i;
+ u8 value;
+
+ value = DP_TRAINING_PATTERN_1;
+ write32(&edp->regs->dp_training_ptn_set, value);
+ rk_edp_dpcd_write(edp, DPCD_TRAINING_PATTERN_SET, &value, 1);
+ memset(edp->train_set, 0, 4);
+
+ /* clock recovery loop */
+ clock_recovery = 0;
+ tries = 0;
+ voltage = 0xff;
+
+ while (1) {
+ rk_edp_set_link_training(edp, edp->train_set);
+ rk_edp_dpcd_write(edp, DPCD_TRAINING_LANE0_SET,
+ edp->train_set,
+ edp->link_train.lane_count);
+
+ mdelay(1);
+
+ if (rk_edp_dpcd_read_link_status(edp, status) < 0) {
+ printk(BIOS_ERR, "displayport link status failed\n");
+ break;
+ }
+
+ if (rk_edp_clock_recovery_ok(status,
+ edp->link_train.lane_count)) {
+ clock_recovery = 1;
+ 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) {
+ printk(BIOS_ERR, "clock recovery reached max voltage\n");
+ break;
+ }
+
+ if ((edp->train_set[0] &
+ DP_TRAIN_VOLTAGE_SWING_MASK) == voltage) {
+ ++tries;
+ if (tries == MAX_CR_LOOP) {
+ printk(BIOS_ERR, "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) {
+ printk(BIOS_ERR, "clock recovery failed\n");
+ return -1;
+ } else {
+ printk(BIOS_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 *edp)
+{
+ int channel_eq;
+ u8 value, tries = 0;
+ u8 status[DP_LINK_STATUS_SIZE];
+
+ value = DP_TRAINING_PATTERN_2;
+ write32(&edp->regs->dp_training_ptn_set, value);
+ rk_edp_dpcd_write(edp, DPCD_TRAINING_PATTERN_SET, &value, 1);
+
+ /* channel equalization loop */
+ channel_eq = 0;
+ for (tries = 0; tries < 5; tries++) {
+ rk_edp_set_link_training(edp, edp->train_set);
+ rk_edp_dpcd_write(edp, DPCD_TRAINING_LANE0_SET,
+ edp->train_set,
+ edp->link_train.lane_count);
+
+ udelay(400);
+ if (rk_edp_dpcd_read_link_status(edp, status) < 0) {
+ printk(BIOS_ERR, "displayport link status failed\n");
+ return -1;
+ }
+
+ if (rk_edp_channel_eq_ok(status,
+ edp->link_train.lane_count)) {
+ channel_eq = 1;
+ break;
+ }
+ edp_get_adjust_train(status,
+ edp->link_train.lane_count,
+ edp->train_set);
+ }
+
+ if (!channel_eq) {
+ printk(BIOS_ERR, "channel eq failed\n");
+ return -1;
+ } else {
+ printk(BIOS_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 *edp)
+{
+ u8 values[3];
+ int err;
+
+ err = rk_edp_dpcd_read(edp, DPCD_DPCD_REV, values, sizeof(values));
+ if (err < 0)
+ return err;
+
+ 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;
+
+ edp_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)) {
+ edp_debug("Rx Max Link Rate is abnormal :%x\n",
+ edp->link_train.link_rate);
+ return -1;
+ }
+
+ if (edp->link_train.lane_count == 0) {
+ edp_debug("Rx Max Lane count is abnormal :%x\n",
+ edp->link_train.lane_count);
+ return -1;
+ }
+
+ rk_edp_link_power_up(edp);
+ rk_edp_link_configure(edp);
+ return 0;
+}
+
+static int rk_edp_hw_link_training(struct rk_edp *edp)
+{
+ u32 val;
+ struct stopwatch sw;
+
+ /* Set link rate and count as you want to establish*/
+ write32(&edp->regs->link_bw_set, edp->link_train.link_rate);
+ write32(&edp->regs->lane_count_set, edp->link_train.lane_count);
+
+ if (rk_edp_link_train_cr(edp))
+ return -1;
+ if (rk_edp_link_train_ce(edp))
+ return -1;
+
+ write32(&edp->regs->dp_hw_link_training, HW_LT_EN);
+ stopwatch_init_msecs_expire(&sw, 10);
+ do {
+ val = read32(&edp->regs->dp_hw_link_training);
+ if (!(val & HW_LT_EN))
+ break;
+ } while (!stopwatch_expired(&sw));
+ if (val & HW_LT_ERR_CODE_MASK) {
+ printk(BIOS_ERR, "edp hw link training error: %d\n",
+ val >> HW_LT_ERR_CODE_SHIFT);
+ return -1;
+ }
+ return 0;
+
+}
+
+static int rk_edp_select_i2c_device(struct rk_edp *edp,
+ unsigned int device_addr,
+ unsigned int val_addr)
+{
+ u32 val;
+ int retval;
+
+ /* Set EDID device address */
+ val = device_addr;
+ write32(&edp->regs->aux_addr_7_0, val);
+ write32(&edp->regs->aux_addr_15_8, 0x0);
+ write32(&edp->regs->aux_addr_19_16, 0x0);
+
+ /* Set offset from base address of EDID device */
+ write32(&edp->regs->buf_data[0], val_addr);
+
+ /*
+ * Set I2C transaction and write address
+ * If bit 3 is 1, DisplayPort transaction.
+ * If Bit 3 is 0, I2C transaction.
+ */
+ val = AUX_TX_COMM_I2C_TRANSACTION | AUX_TX_COMM_MOT |
+ AUX_TX_COMM_WRITE;
+ write32(&edp->regs->aux_ch_ctl_1, val);
+
+ /* Start AUX transaction */
+ retval = rk_edp_start_aux_transaction(edp);
+ if (retval != 0)
+ edp_debug("select_i2c_device Aux Transaction fail!\n");
+
+ return retval;
+}
+
+static int rk_edp_read_bytes_from_i2c(struct rk_edp *edp,
+ 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 retval = 0;
+
+ for (i = 0; i < count; i += 16) {
+ for (j = 0; j < 10; j++) { /* try 10 times */
+ /* Clear AUX CH data buffer */
+ val = BUF_CLR;
+ write32(&edp->regs->buf_data_ctl, val);
+
+ /* Set normal AUX CH command */
+ clrbits_le32(&edp->regs->aux_ch_ctl_2, ADDR_ONLY);
+
+ /*
+ * If Rx sends defer, Tx sends only reads
+ * request without sending address
+ */
+ if (!defer)
+ retval = rk_edp_select_i2c_device(edp,
+ 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.
+ */
+ val = AUX_LENGTH(16) | AUX_TX_COMM_I2C_TRANSACTION |
+ AUX_TX_COMM_READ;
+ write32(&edp->regs->aux_ch_ctl_1, val);
+
+ /* Start AUX transaction */
+ retval = rk_edp_start_aux_transaction(edp);
+ if (retval == 0)
+ break;
+ else {
+ edp_debug("Aux Transaction fail!\n");
+ continue;
+ }
+
+ /* Check if Rx sends defer */
+ val = read32(&edp->regs->aux_rx_comm);
+ if (val == AUX_RX_COMM_AUX_DEFER ||
+ val == AUX_RX_COMM_I2C_DEFER) {
+ edp_debug("Defer: %d\n\n", val);
+ defer = 1;
+ }
+ }
+
+ if (retval)
+ return -1;
+
+ for (cur_data_idx = 0; cur_data_idx < 16; cur_data_idx++) {
+ val = read32(&edp->regs->buf_data[cur_data_idx]);
+ edid[i + cur_data_idx] = (u8)val;
+ }
+ }
+
+ return retval;
+}
+
+static int rk_edp_read_edid(struct rk_edp *edp, struct edid *edid)
+{
+ u8 buf[EDID_LENGTH * 2];
+ u32 edid_size = EDID_LENGTH;
+ int retval;
+
+ /* Read EDID data */
+ retval = rk_edp_read_bytes_from_i2c(edp, EDID_ADDR,
+ EDID_HEADER, EDID_LENGTH,
+ &buf[EDID_HEADER]);
+ if (retval != 0) {
+ printk(BIOS_ERR, "EDID Read failed!\n");
+ return -1;
+ }
+
+ /* check if edid have extension flag, and read additional EDID data */
+ if (buf[EDID_EXTENSION_FLAG]) {
+ edid_size += EDID_LENGTH;
+ retval = rk_edp_read_bytes_from_i2c(edp, EDID_ADDR,
+ EDID_LENGTH, EDID_LENGTH,
+ &buf[EDID_LENGTH]);
+ if (retval != 0) {
+ printk(BIOS_ERR, "EDID Read failed!\n");
+ return -1;
+ }
+ }
+
+ if (decode_edid(buf, edid_size, edid)) {
+ printk(BIOS_ERR, "%s: Failed to decode EDID.\n",
+ __func__);
+ return -1;
+ }
+
+ edp_debug("EDID Read success!\n");
+ return 0;
+}
+
+static int rk_edp_set_link_train(struct rk_edp *edp)
+{
+ int retval;
+
+ if (rk_edp_init_training(edp)) {
+ printk(BIOS_ERR, "DP LT init failed!\n");
+ return -1;
+ }
+
+ retval = rk_edp_hw_link_training(edp);
+
+ return retval;
+}
+
+static void rk_edp_init_video(struct rk_edp *edp)
+{
+ u32 val;
+
+ val = VSYNC_DET | VID_FORMAT_CHG | VID_CLK_CHG;
+ write32(&edp->regs->common_int_sta_1, val);
+
+ val = CHA_CRI(4) | CHA_CTRL;
+ write32(&edp->regs->sys_ctl_2, val);
+
+ val = VID_HRES_TH(2) | VID_VRES_TH(0);
+ write32(&edp->regs->video_ctl_8, val);
+}
+
+static void rk_edp_config_video_slave_mode(struct rk_edp *edp)
+{
+ clrbits_le32(&edp->regs->func_en_1,
+ VID_FIFO_FUNC_EN_N | VID_CAP_FUNC_EN_N);
+}
+
+static void rk_edp_set_video_cr_mn(struct rk_edp *edp,
+ enum clock_recovery_m_value_type type,
+ u32 m_value,
+ u32 n_value)
+{
+ u32 val;
+
+ if (type == REGISTER_M) {
+ setbits_le32(&edp->regs->sys_ctl_4, FIX_M_VID);
+ val = m_value & 0xff;
+ write32(&edp->regs->m_vid_0, val);
+ val = (m_value >> 8) & 0xff;
+ write32(&edp->regs->m_vid_1, val);
+ val = (m_value >> 16) & 0xff;
+ write32(&edp->regs->m_vid_2, val);
+
+ val = n_value & 0xff;
+ write32(&edp->regs->n_vid_0, val);
+ val = (n_value >> 8) & 0xff;
+ write32(&edp->regs->n_vid_1, val);
+ val = (n_value >> 16) & 0xff;
+ write32(&edp->regs->n_vid_2, val);
+ } else {
+ clrbits_le32(&edp->regs->sys_ctl_4, FIX_M_VID);
+
+ write32(&edp->regs->n_vid_0, 0x00);
+ write32(&edp->regs->n_vid_1, 0x80);
+ write32(&edp->regs->n_vid_2, 0x00);
+ }
+}
+
+static int rk_edp_is_video_stream_clock_on(struct rk_edp *edp)
+{
+ u32 val;
+ struct stopwatch sw;
+
+ stopwatch_init_msecs_expire(&sw, 100);
+ do {
+ val = read32(&edp->regs->sys_ctl_1);
+
+ /*must write value to update DET_STA bit status*/
+ write32(&edp->regs->sys_ctl_1, val);
+ val = read32(&edp->regs->sys_ctl_1);
+ if (!(val & DET_STA))
+ continue;
+
+ val = read32(&edp->regs->sys_ctl_2);
+
+ /*must write value to update CHA_STA bit status*/
+ write32(&edp->regs->sys_ctl_2, val);
+ val = read32(&edp->regs->sys_ctl_2);
+ if (!(val & CHA_STA))
+ return 0;
+ } while (!stopwatch_expired(&sw));
+
+ return -1;
+}
+
+static int rk_edp_is_video_stream_on(struct rk_edp *edp)
+{
+ u32 val;
+ struct stopwatch sw;
+
+ stopwatch_init_msecs_expire(&sw, 100);
+ do {
+ val = read32(&edp->regs->sys_ctl_3);
+
+ /*must write value to update STRM_VALID bit status*/
+ write32(&edp->regs->sys_ctl_3, val);
+
+ val = read32(&edp->regs->sys_ctl_3);
+ if (!(val & STRM_VALID))
+ return 0;
+ } while (!stopwatch_expired(&sw));
+
+ return -1;
+}
+
+static int rk_edp_config_video(struct rk_edp *edp)
+{
+ rk_edp_config_video_slave_mode(edp);
+
+ if (rk_edp_get_pll_lock_status(edp) == DP_PLL_UNLOCKED) {
+ edp_debug("PLL is not locked yet.\n");
+ return -1;
+ }
+
+ if (rk_edp_is_video_stream_clock_on(edp))
+ return -1;
+
+ /* Set to use the register calculated M/N video */
+ rk_edp_set_video_cr_mn(edp, 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 *edp)
+{
+ u32 val;
+
+ val = read32(&edp->regs->sys_ctl_3);
+ val |= (F_HPD | HPD_CTRL);
+ write32(&edp->regs->sys_ctl_3, val);
+}
+
+static int rockchip_edp_get_plug_in_status(struct rk_edp *edp)
+{
+ u32 val;
+
+ val = read32(&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 360ms to try to get the hpd single now,
+ * if we can not get edp hpd single, it will delay 360ms,
+ * also meet the edp power timing request, to compatible
+ * all of the hardware version
+ */
+static void rk_edp_wait_hpd(struct rk_edp *edp)
+{
+ struct stopwatch hpd;
+
+ stopwatch_init_msecs_expire(&hpd, 360);
+ do {
+ if (rockchip_edp_get_plug_in_status(edp))
+ return;
+ udelay(100);
+ } while (!stopwatch_expired(&hpd));
+
+ printk(BIOS_DEBUG, "do not get hpd single, force hpd\n");
+ rockchip_edp_force_hpd(edp);
+}
+
+int rk_edp_get_edid(struct edid *edid)
+{
+ int i;
+ int retval;
+
+ /* Read EDID */
+ for (i = 0; i < 3; i++) {
+ retval = rk_edp_read_edid(&rk_edp, edid);
+ if (retval == 0)
+ break;
+ }
+
+ return retval;
+}
+
+int rk_edp_enable(void)
+{
+ int ret = 0;
+
+ if (rk_edp_set_link_train(&rk_edp)) {
+ printk(BIOS_ERR, "link train failed!\n");
+ return -1;
+ }
+
+ rk_edp_init_video(&rk_edp);
+ ret = rk_edp_config_video(&rk_edp);
+ if (ret)
+ printk(BIOS_ERR, "config video failed\n");
+
+ return ret;
+}
+
+void rk_edp_init(void)
+{
+ rk_edp.regs = (struct rk_edp_regs *)EDP_BASE;
+
+ rk_edp_wait_hpd(&rk_edp);
+
+ rk_edp_init_refclk(&rk_edp);
+ rk_edp_init_interrupt(&rk_edp);
+ rk_edp_enable_sw_function(&rk_edp);
+ rk_edp_init_analog_func(&rk_edp);
+ rk_edp_init_aux(&rk_edp);
+}