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u-boot/drivers/video/rockchip/rk_edp.c
Stephen Warren 135aa95002 clk: convert API to match reset/mailbox style 
The following changes are made to the clock API:
* The concept of "clocks" and "peripheral clocks" are unified; each clock
  provider now implements a single set of clocks. This provides a simpler
  conceptual interface to clients, and better aligns with device tree
  clock bindings.
* Clocks are now identified with a single "struct clk", rather than
  requiring clients to store the clock provider device and clock identity
  values separately. For simple clock consumers, this isolates clients
  from internal details of the clock API.
* clk.h is split so it only contains the client/consumer API, whereas
  clk-uclass.h contains the provider API. This aligns with the recently
  added reset and mailbox APIs.
* clk_ops .of_xlate(), .request(), and .free() are added so providers
  can customize these operations if needed. This also aligns with the
  recently added reset and mailbox APIs.
* clk_disable() is added.
* All users of the current clock APIs are updated.
* Sandbox clock tests are updated to exercise clock lookup via DT, and
  clock enable/disable.
* rkclk_get_clk() is removed and replaced with standard APIs.

Buildman shows no clock-related errors for any board for which buildman
can download a toolchain.

test/py passes for sandbox (which invokes the dm clk test amongst
others).

Signed-off-by: Stephen Warren <swarren@nvidia.com>
Acked-by: Simon Glass <sjg@chromium.org>
2016-06-19 17:05:55 -06:00

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/*
* 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, &regs->analog_ctl_2);
writel(REF_CLK_24M, &regs->pll_reg_1);
writel(LDO_OUTPUT_V_SEL_145 | KVCO_DEFALUT | CHG_PUMP_CUR_SEL_5US |
V2L_CUR_SEL_1MA, &regs->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,
&regs->pll_reg_3);
writel(REGULATOR_V_SEL_950MV | STANDBY_CUR_SEL |
CHG_PUMP_INOUT_CTRL_1200MV | CHG_PUMP_INPUT_CTRL_OP,
&regs->pll_reg_5);
writel(SSC_OFFSET | SSC_MODE | SSC_DEPTH, &regs->ssc_reg);
writel(TX_SWING_PRE_EMP_MODE | PRE_DRIVER_PW_CTRL1 |
LP_MODE_CLK_REGULATOR | RESISTOR_MSB_CTRL | RESISTOR_CTRL,
&regs->tx_common);
writel(DP_AUX_COMMON_MODE | DP_AUX_EN | AUX_TERM_50OHM,
&regs->dp_aux);
writel(DP_BG_OUT_SEL | DP_DB_CUR_CTRL | DP_BG_SEL | DP_RESISTOR_TUNE_BG,
&regs->dp_bias);
writel(CH1_CH3_SWING_EMP_CTRL | CH0_CH2_SWING_EMP_CTRL,
&regs->dp_reserv2);
}
static void rk_edp_init_interrupt(struct rk3288_edp *regs)
{
/* Set interrupt pin assertion polarity as high */
writel(INT_POL, &regs->int_ctl);
/* Clear pending registers */
writel(0xff, &regs->common_int_sta_1);
writel(0x4f, &regs->common_int_sta_2);
writel(0xff, &regs->common_int_sta_3);
writel(0x27, &regs->common_int_sta_4);
writel(0x7f, &regs->dp_int_sta);
/* 0:mask,1: unmask */
writel(0x00, &regs->common_int_mask_1);
writel(0x00, &regs->common_int_mask_2);
writel(0x00, &regs->common_int_mask_3);
writel(0x00, &regs->common_int_mask_4);
writel(0x00, &regs->int_sta_mask);
}
static void rk_edp_enable_sw_function(struct rk3288_edp *regs)
{
clrbits_le32(&regs->func_en_1, SW_FUNC_EN_N);
}
static bool rk_edp_get_pll_locked(struct rk3288_edp *regs)
{
u32 val;
val = readl(&regs->dp_debug_ctl);
return val & PLL_LOCK;
}
static int rk_edp_init_analog_func(struct rk3288_edp *regs)
{
ulong start;
writel(0x00, &regs->dp_pd);
writel(PLL_LOCK_CHG, &regs->common_int_sta_1);
clrbits_le32(&regs->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(&regs->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, &regs->dp_int_sta);
/* Disable AUX channel module */
setbits_le32(&regs->func_en_2, AUX_FUNC_EN_N);
/* Receive AUX Channel DEFER commands equal to DEFFER_COUNT*64 */
writel(DEFER_CTRL_EN | DEFER_COUNT(1), &regs->aux_ch_defer_dtl);
/* Enable AUX channel module */
clrbits_le32(&regs->func_en_2, AUX_FUNC_EN_N);
}
static int rk_edp_aux_enable(struct rk3288_edp *regs)
{
ulong start;
setbits_le32(&regs->aux_ch_ctl_2, AUX_EN);
start = get_timer(0);
do {
if (!(readl(&regs->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(&regs->dp_int_sta) & RPLY_RECEIV)) {
if (get_timer(start) > 10)
return -ETIMEDOUT;
}
writel(RPLY_RECEIV, &regs->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(&regs->dp_int_sta);
if (val & AUX_ERR) {
writel(AUX_ERR, &regs->dp_int_sta);
return -EIO;
}
/* Check AUX CH error access status */
val = readl(&regs->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, &regs->buf_data_ctl);
/* Select DPCD device address */
writel(AUX_ADDR_7_0(val_addr), &regs->aux_addr_7_0);
writel(AUX_ADDR_15_8(val_addr), &regs->aux_addr_15_8);
writel(AUX_ADDR_19_16(val_addr), &regs->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++, &regs->buf_data[i]);
} else
val = AUX_LENGTH(len) |
AUX_TX_COMM_DP_TRANSACTION |
AUX_TX_COMM_READ;
writel(val, &regs->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(&regs->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, &regs->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, &regs->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, &regs->aux_addr_7_0);
writel(0x0, &regs->aux_addr_15_8);
writel(0x0, &regs->aux_addr_19_16);
/* Set offset from base address of EDID device */
writel(val_addr, &regs->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, &regs->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, &regs->buf_data_ctl);
/* Set normal AUX CH command */
clrbits_le32(&regs->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, &regs->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(&regs->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(&regs->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,
&regs->common_int_sta_1);
writel(CHA_CRI(4) | CHA_CTRL, &regs->sys_ctl_2);
writel(VID_HRES_TH(2) | VID_VRES_TH(0), &regs->video_ctl_8);
}
static void rk_edp_config_video_slave_mode(struct rk3288_edp *regs)
{
clrbits_le32(&regs->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(&regs->sys_ctl_4, FIX_M_VID);
writel(m_value & 0xff, &regs->m_vid_0);
writel((m_value >> 8) & 0xff, &regs->m_vid_1);
writel((m_value >> 16) & 0xff, &regs->m_vid_2);
writel(n_value & 0xf, &regs->n_vid_0);
writel((n_value >> 8) & 0xff, &regs->n_vid_1);
writel((n_value >> 16) & 0xff, &regs->n_vid_2);
} else {
clrbits_le32(&regs->sys_ctl_4, FIX_M_VID);
writel(0x00, &regs->n_vid_0);
writel(0x80, &regs->n_vid_1);
writel(0x00, &regs->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(&regs->sys_ctl_1);
/* must write value to update DET_STA bit status */
writel(val, &regs->sys_ctl_1);
val = readl(&regs->sys_ctl_1);
if (!(val & DET_STA))
continue;
val = readl(&regs->sys_ctl_2);
/* must write value to update CHA_STA bit status */
writel(val, &regs->sys_ctl_2);
val = readl(&regs->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 clk clk;
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) {
ret = clk_set_rate(&clk, 0);
clk_free(&clk);
}
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) {
ret = clk_set_rate(&clk, 192000000);
clk_free(&clk);
}
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),
};
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