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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>
This commit is contained in:
Vinod Polimera 2021-03-17 16:11:12 +05:30 committed by Julius Werner
parent e0dbeee40f
commit 6ea8033705
4 changed files with 31 additions and 0 deletions
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22
src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.c
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@ -31,6 +31,14 @@
#define DP_MAX_SUPPORTED_RATES 8 /* 16-bit little-endian */ #define DP_MAX_SUPPORTED_RATES 8 /* 16-bit little-endian */
#define DP_LANE_COUNT_MASK 0xf #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 */ /* link configuration */
#define DP_LINK_BW_SET 0x100 #define DP_LINK_BW_SET 0x100
#define DP_LINK_BW_1_62 0x06 #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"); 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) static void sn65dsi86_bridge_assr_config(uint8_t bus, uint8_t chip, int enable)
{ {
if (enable) if (enable)

1
src/drivers/ti/sn65dsi86bridge/sn65dsi86bridge.h
View File

@ -18,5 +18,6 @@ void sn65dsi86_bridge_configure(uint8_t bus, uint8_t chip,
struct edid *edid, uint32_t num_of_lines, struct edid *edid, uint32_t num_of_lines,
uint32_t dsi_bpp); uint32_t dsi_bpp);
enum cb_err sn65dsi86_bridge_read_edid(uint8_t bus, uint8_t chip, struct edid *out); 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 #endif

5
src/mainboard/google/trogdor/Kconfig
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@ -7,6 +7,11 @@ if BOARD_GOOGLE_TROGDOR_COMMON
config TROGDOR_REV0 config TROGDOR_REV0
def_bool n def_bool n
config TROGDOR_HAS_BRIDGE_BACKLIGHT
bool
default y if BOARD_GOOGLE_HOMESTAR
default n
config TROGDOR_HAS_FINGERPRINT config TROGDOR_HAS_FINGERPRINT
bool bool
default y if BOARD_GOOGLE_COACHZ default y if BOARD_GOOGLE_COACHZ

3
src/mainboard/google/trogdor/mainboard.c
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@ -83,6 +83,9 @@ static void display_init(struct edid *edid)
return; return;
sn65dsi86_bridge_configure(BRIDGE_BUS, BRIDGE_CHIP, edid, lanes, dsi_bpp); 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); mdp_dsi_video_config(edid);
mdss_dsi_video_mode_config(edid, dsi_bpp); mdss_dsi_video_mode_config(edid, dsi_bpp);
mdp_dsi_video_on(); mdp_dsi_video_on();