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gru: Initialize I2C bus for ARC2C0608 

BUG=b:35583511
TEST=check i2c bus 0 initializes from ap console log

Change-Id: Ibb6709159f5ed28ad0b62397d2ddb504dec55167
Signed-off-by: Philip Chen <philipchen@google.com>
Reviewed-on: https://review.coreboot.org/19105
Tested-by: build bot (Jenkins)
Reviewed-by: Julius Werner <jwerner@chromium.org>
This commit is contained in:
Philip Chen 2017-04-06 10:17:08 -07:00 committed by Julius Werner
parent c91ab1cfce
commit a304b69a45
1 changed files with 3 additions and 31 deletions
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34
src/mainboard/google/gru/mainboard.c
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@ -333,30 +333,8 @@ static void mainboard_init(device_t dev)
register_apio_suspend();
}
static void enable_backlight_booster(void)
static void prepare_backlight_i2c(void)
{
const struct {
uint8_t reg;
uint8_t value;
} i2c_writes[] = {
{1, 0x84},
{1, 0x85},
{0, 0x26}
};
int i;
const int booster_i2c_port = 0;
uint8_t i2c_buf[2];
struct i2c_seg i2c_command = { .read = 0, .chip = 0x2c,
.buf = i2c_buf, .len = sizeof(i2c_buf)
};
/*
* This function is called on Gru right after BL_EN is asserted. It
* takes time for the switcher chip to come online, let's wait a bit
* to let the voltage settle, so that the chip can be accessed.
*/
udelay(1000);
gpio_input(GPIO(1, B, 7)); /* I2C0_SDA remove pull_up */
gpio_input(GPIO(1, C, 0)); /* I2C0_SCL remove pull_up */
@ -364,20 +342,14 @@ static void enable_backlight_booster(void)
write32(&rk3399_pmugrf->iomux_i2c0_sda, IOMUX_I2C0_SDA);
write32(&rk3399_pmugrf->iomux_i2c0_scl, IOMUX_I2C0_SCL);
for (i = 0; i < ARRAY_SIZE(i2c_writes); i++) {
i2c_buf[0] = i2c_writes[i].reg;
i2c_buf[1] = i2c_writes[i].value;
i2c_transfer(booster_i2c_port, &i2c_command, 1);
}
}
void mainboard_power_on_backlight(void)
{
gpio_output(GPIO_BACKLIGHT, 1); /* BL_EN */
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU) && board_id() == 0)
enable_backlight_booster();
if (IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU))
prepare_backlight_i2c();
}
static void mainboard_enable(device_t dev)