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drm/amd/display: Add VESA SCR case for default aux backlight

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[How & Why]
When determining default aux backlight level, read from
DPCD address 0x734 for VESA SCR on OLED.

Reviewed-by: Felipe Clark <felipe.clark@amd.com>
Acked-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Iswara Nagulendran <iswara.nagulendran@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Iswara Nagulendran 2023-07-10 14:01:35 -04:00 committed by Alex Deucher
parent cbd0606e6a
commit 66c2596179
1 changed files with 14 additions and 4 deletions
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18
drivers/gpu/drm/amd/display/dc/link/protocols/link_edp_panel_control.c
View File

@ -252,10 +252,20 @@ static bool read_default_bl_aux(struct dc_link *link, uint32_t *backlight_millin
link->connector_signal != SIGNAL_TYPE_DISPLAY_PORT))
return false;
if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
(uint8_t *) backlight_millinits,
sizeof(uint32_t)))
return false;
if (!link->dpcd_caps.panel_luminance_control) {
if (!core_link_read_dpcd(link, DP_SOURCE_BACKLIGHT_LEVEL,
(uint8_t *)backlight_millinits,
sizeof(uint32_t)))
return false;
} else {
//setting to 0 as a precaution, since target_luminance_value is 3 bytes
memset(backlight_millinits, 0, sizeof(uint32_t));
if (!core_link_read_dpcd(link, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE,
(uint8_t *)backlight_millinits,
sizeof(struct target_luminance_value)))
return false;
}
return true;
}