diff options
| author | Vinod Polimera <vpolimer@codeaurora.org> | 2021-03-17 16:11:12 +0530 |
|---|---|---|
| committer | Julius Werner <jwerner@chromium.org> | 2021-05-08 00:13:13 +0000 |
| commit | 6ea8033705a611518948e1f61cef2afed1b5341d (patch) | |
| tree | d074cdceeb4681815c914a8cef6b5b1243e1b43e /src | |
| parent | e0dbeee40f9cfa0e43465db1a3f1c6c510b212ab (diff) | |
trogdor: Add backlight support for sn65dsi86bridge for Homestar
Add backlight support in sn65dsi86bridge through the AUX channel using
eDP DPCD registers, which is needed on the GOOGLE_HOMESTAR board.
Change-Id: Ie700080f1feabe2d3397c38088a64cff27bfbe55
Signed-off-by: Vinod Polimera <vpolimer@codeaurora.org>
Signed-off-by: Julius Werner <jwerner@chromium.org>
Reviewed-on: https://review.coreboot.org/c/coreboot/+/52663
Reviewed-by: Douglas Anderson <dianders@chromium.org>
Tested-by: build bot (Jenkins) <no-reply@coreboot.org>
Diffstat (limited to 'src')
| -rw-r--r-- | src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c | 22 | ||||
| -rw-r--r-- | src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h | 1 | ||||
| -rw-r--r-- | src/mainboard/google/trogdor/Kconfig | 5 | ||||
| -rw-r--r-- | src/mainboard/google/trogdor/mainboard.c | 3 |
4 files changed, 31 insertions, 0 deletions
diff --git a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c index 1cbf6fd97d..2ba0977547 100644 --- a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c +++ b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c @@ -31,6 +31,14 @@ #define DP_MAX_SUPPORTED_RATES 8 /* 16-bit little-endian */ #define DP_LANE_COUNT_MASK 0xf +/* Backlight configuration */ +#define DP_BACKLIGHT_MODE_SET 0x721 +#define DP_BACKLIGHT_CONTROL_MODE_MASK 0x3 +#define DP_BACKLIGHT_CONTROL_MODE_DPCD 0x2 +#define DP_DISPLAY_CONTROL_REGISTER 0x720 +#define DP_BACKLIGHT_ENABLE 0x1 +#define DP_BACKLIGHT_BRIGHTNESS_MSB 0x722 + /* link configuration */ #define DP_LINK_BW_SET 0x100 #define DP_LINK_BW_1_62 0x06 @@ -497,6 +505,20 @@ static void sn65dsi86_bridge_link_training(uint8_t bus, uint8_t chip) printk(BIOS_ERR, "ERROR: Link training failed 10 times\n"); } +void sn65dsi86_backlight_enable(uint8_t bus, uint8_t chip) +{ + uint8_t val = DP_BACKLIGHT_CONTROL_MODE_DPCD; + sn65dsi86_bridge_aux_request(bus, chip, DP_BACKLIGHT_MODE_SET, 1, DPCD_WRITE, &val); + + val = 0xff; + sn65dsi86_bridge_aux_request(bus, chip, DP_BACKLIGHT_BRIGHTNESS_MSB, 1, + DPCD_WRITE, &val); + + val = DP_BACKLIGHT_ENABLE; + sn65dsi86_bridge_aux_request(bus, chip, DP_DISPLAY_CONTROL_REGISTER, 1, + DPCD_WRITE, &val); +} + static void sn65dsi86_bridge_assr_config(uint8_t bus, uint8_t chip, int enable) { if (enable) diff --git a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h index 83b940bbb4..0f03080185 100644 --- a/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h +++ b/src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h @@ -18,5 +18,6 @@ void sn65dsi86_bridge_configure(uint8_t bus, uint8_t chip, struct edid *edid, uint32_t num_of_lines, uint32_t dsi_bpp); enum cb_err sn65dsi86_bridge_read_edid(uint8_t bus, uint8_t chip, struct edid *out); +void sn65dsi86_backlight_enable(uint8_t bus, uint8_t chip); #endif diff --git a/src/mainboard/google/trogdor/Kconfig b/src/mainboard/google/trogdor/Kconfig index 5538205476..4a2630d599 100644 --- a/src/mainboard/google/trogdor/Kconfig +++ b/src/mainboard/google/trogdor/Kconfig @@ -7,6 +7,11 @@ if BOARD_GOOGLE_TROGDOR_COMMON config TROGDOR_REV0 def_bool n +config TROGDOR_HAS_BRIDGE_BACKLIGHT + bool + default y if BOARD_GOOGLE_HOMESTAR + default n + config TROGDOR_HAS_FINGERPRINT bool default y if BOARD_GOOGLE_COACHZ diff --git a/src/mainboard/google/trogdor/mainboard.c b/src/mainboard/google/trogdor/mainboard.c index 61a64f842e..864bd6daa6 100644 --- a/src/mainboard/google/trogdor/mainboard.c +++ b/src/mainboard/google/trogdor/mainboard.c @@ -83,6 +83,9 @@ static void display_init(struct edid *edid) return; sn65dsi86_bridge_configure(BRIDGE_BUS, BRIDGE_CHIP, edid, lanes, dsi_bpp); + if (CONFIG(TROGDOR_HAS_BRIDGE_BACKLIGHT)) + sn65dsi86_backlight_enable(BRIDGE_BUS, BRIDGE_CHIP); + mdp_dsi_video_config(edid); mdss_dsi_video_mode_config(edid, dsi_bpp); mdp_dsi_video_on(); |