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/* SPDX-License-Identifier: GPL-2.0-only */
#include <delay.h>
#include <device/i2c_simple.h>
#include <edid.h>
#include <console/console.h>
#include <timer.h>
#include <dp_aux.h>
#include "ps8640.h"
int ps8640_get_edid(uint8_t bus, uint8_t chip, struct edid *out)
{
int ret;
u8 edid[EDID_LENGTH * 2];
int edid_size = EDID_LENGTH;
i2c_writeb(bus, chip + 2, PAGE2_I2C_BYPASS,
EDID_I2C_ADDR | I2C_BYPASS_EN);
ret = i2c_read_bytes(bus, EDID_I2C_ADDR, 0, edid, EDID_LENGTH);
if (ret != 0) {
printk(BIOS_INFO, "Failed to read EDID.\n");
return -1;
}
/* check if edid have extension flag, and read additional EDID data */
if (edid[EDID_EXTENSION_FLAG]) {
edid_size += EDID_LENGTH;
ret = i2c_read_bytes(bus, EDID_I2C_ADDR, EDID_LENGTH,
&edid[EDID_LENGTH], EDID_LENGTH);
if (ret != 0) {
printk(BIOS_INFO, "Failed to read EDID ext block.\n");
return -1;
}
}
if (decode_edid(edid, edid_size, out) != EDID_CONFORMANT) {
printk(BIOS_INFO, "Failed to decode EDID.\n");
return -1;
}
return 0;
}
int ps8640_init(uint8_t bus, uint8_t chip)
{
u8 set_vdo_done;
struct stopwatch sw;
mdelay(200);
stopwatch_init_msecs_expire(&sw, 200);
while (true) {
i2c_readb(bus, chip + 2, PAGE2_GPIO_H, &set_vdo_done);
if ((set_vdo_done & PS_GPIO9) == PS_GPIO9)
break;
if (stopwatch_expired(&sw)) {
printk(BIOS_INFO, "Failed to init ps8640.\n");
return -1;
}
mdelay(20);
}
mdelay(50);
/*
* The Manufacturer Command Set (MCS) is a device dependent interface
* intended for factory programming of the display module default
* parameters. Once the display module is configured, the MCS shall be
* disabled by the manufacturer. Once disabled, all MCS commands are
* ignored by the display interface.
*/
i2c_write_field(bus, chip + 2, PAGE2_MCS_EN, 0x0, MCS_EN_MASK,
MCS_EN_SHIFT);
i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_DIS);
i2c_writeb(bus, chip + 3, PAGE3_SET_ADD, VDO_CTL_ADD);
i2c_writeb(bus, chip + 3, PAGE3_SET_VAL, VDO_EN);
return 0;
}
static cb_err_t ps8640_bridge_aux_request(uint8_t bus,
uint8_t chip,
unsigned int target_reg,
unsigned int total_size,
enum aux_request request,
uint8_t *data)
{
int i;
uint32_t length;
uint8_t buf;
uint8_t reg;
int ret;
if (target_reg & ~SWAUX_ADDR_MASK)
return CB_ERR;
while (total_size) {
length = MIN(total_size, DP_AUX_MAX_PAYLOAD_BYTES);
total_size -= length;
ret = i2c_writeb(bus, chip, PAGE0_AUXCH_CFG3, AUXCH_CFG3_RESET);
if (ret)
return CB_ERR;
enum i2c_over_aux cmd = dp_get_aux_cmd(request, total_size);
if (i2c_writeb(bus, chip, PAGE0_SWAUX_ADDR_23_16,
(target_reg >> 16) | (cmd << 4)) ||
i2c_writeb(bus, chip, PAGE0_SWAUX_ADDR_15_8, target_reg >> 8) ||
i2c_writeb(bus, chip, PAGE0_SWAUX_ADDR_7_0, target_reg)) {
return CB_ERR;
}
if (dp_aux_request_is_write(request)) {
reg = PAGE0_SWAUX_WDATA;
for (i = 0; i < length; i++) {
ret = i2c_writeb(bus, chip, reg++, *data++);
if (ret)
return CB_ERR;
}
} else {
if (length == 0)
i2c_writeb(bus, chip, PAGE0_SWAUX_LENGTH, SWAUX_NO_PAYLOAD);
else
i2c_writeb(bus, chip, PAGE0_SWAUX_LENGTH, length - 1);
}
ret = i2c_writeb(bus, chip, PAGE0_SWAUX_CTRL, SWAUX_SEND);
if (ret)
return CB_ERR;
if (!wait_ms(100, !i2c_readb(bus, chip, PAGE0_SWAUX_CTRL, &buf) &&
!(buf & SWAUX_SEND)))
return CB_ERR;
if (i2c_readb(bus, chip, PAGE0_SWAUX_STATUS, &buf))
return CB_ERR;
switch (buf & SWAUX_STATUS_MASK) {
case SWAUX_STATUS_NACK:
case SWAUX_STATUS_I2C_NACK:
case SWAUX_STATUS_INVALID:
case SWAUX_STATUS_TIMEOUT:
return CB_ERR;
case SWAUX_STATUS_ACKM:
length = buf & SWAUX_M_MASK;
break;
}
if (length && !dp_aux_request_is_write(request)) {
reg = PAGE0_SWAUX_RDATA;
for (i = 0; i < length; i++) {
if (i2c_readb(bus, chip, reg++, &buf))
return CB_ERR;
*data++ = buf;
}
}
}
return CB_SUCCESS;
}
void ps8640_backlight_enable(uint8_t bus, uint8_t chip)
{
uint8_t val;
val = DP_BACKLIGHT_CONTROL_MODE_DPCD;
ps8640_bridge_aux_request(bus, chip, DP_BACKLIGHT_MODE_SET, 1,
DPCD_WRITE, &val);
val = 0xff;
ps8640_bridge_aux_request(bus, chip, DP_BACKLIGHT_BRIGHTNESS_MSB, 1,
DPCD_WRITE, &val);
val = DP_BACKLIGHT_ENABLE;
ps8640_bridge_aux_request(bus, chip, DP_DISPLAY_CONTROL_REGISTER, 1,
DPCD_WRITE, &val);
}
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