diff options
Diffstat (limited to 'src/mainboard/google/gru/mainboard.c')
| -rw-r--r-- | src/mainboard/google/gru/mainboard.c | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/src/mainboard/google/gru/mainboard.c b/src/mainboard/google/gru/mainboard.c index 6824cbf546..0ccedd327e 100644 --- a/src/mainboard/google/gru/mainboard.c +++ b/src/mainboard/google/gru/mainboard.c @@ -15,11 +15,15 @@ */ #include <boardid.h> +#include <delay.h> #include <device/device.h> +#include <device/i2c.h> #include <gpio.h> #include <soc/clock.h> +#include <soc/display.h> #include <soc/emmc.h> #include <soc/grf.h> +#include <soc/i2c.h> static void configure_emmc(void) { @@ -86,10 +90,64 @@ static void configure_sdmmc(void) write32(&rk3399_grf->iomux_sdmmc, IOMUX_SDMMC); } +static void configure_display(void) +{ + /* set pinmux for edp HPD*/ + gpio_input_pulldown(GPIO(4, C, 7)); + write32(&rk3399_grf->iomux_edp_hotplug, IOMUX_EDP_HOTPLUG); + + gpio_output(GPIO(4, D, 3), 1); /* CPU3_EDP_VDDEN for P3.3V_DISP */ +} + static void mainboard_init(device_t dev) { configure_sdmmc(); configure_emmc(); + configure_display(); +} + +static void enable_backlight_booster(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); + + /* Select pinmux for i2c0, which is the display backlight booster. */ + write32(&rk3399_pmugrf->iomux_i2c0_sda, IOMUX_I2C0_SDA); + write32(&rk3399_pmugrf->iomux_i2c0_scl, IOMUX_I2C0_SCL); + i2c_init(0, 100*KHz); + + 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(1, C, 1), 1); /* BL_EN */ + + if (IS_ENABLED(CONFIG_BOARD_GOOGLE_GRU)) + enable_backlight_booster(); } static void mainboard_enable(device_t dev) |