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drm/amd/display: Add debugging message for brightness caps

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[Why]
Default BIOS brightness caps are buried in ACPI.

[How]
Add extra dynamic debug that can show default brightness caps.

Reviewed-by: Alex Hung <alex.hung@amd.com>
Signed-off-by: Mario Limonciello <mario.limonciello@amd.com>
Signed-off-by: Wayne Lin <wayne.lin@amd.com>
Tested-by: Daniel Wheeler <daniel.wheeler@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>
This commit is contained in:
Mario Limonciello
2025-05-14 16:00:43 -05:00
committed by Alex Deucher
parent c73375d918
commit 4b61b8a390
1 changed files with 6 additions and 1 deletions
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7
drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c
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@@ -4910,6 +4910,7 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
struct backlight_properties props = { 0 };
struct amdgpu_dm_backlight_caps caps = { 0 };
char bl_name[16];
int min, max;
if (aconnector->bl_idx == -1)
return;
@@ -4922,11 +4923,15 @@ amdgpu_dm_register_backlight_device(struct amdgpu_dm_connector *aconnector)
}
amdgpu_acpi_get_backlight_caps(&caps);
if (caps.caps_valid) {
if (caps.caps_valid && get_brightness_range(&caps, &min, &max)) {
if (power_supply_is_system_supplied() > 0)
props.brightness = caps.ac_level;
else
props.brightness = caps.dc_level;
/* min is zero, so max needs to be adjusted */
props.max_brightness = max - min;
drm_dbg(drm, "Backlight caps: min: %d, max: %d, ac %d, dc %d\n", min, max,
caps.ac_level, caps.dc_level);
} else
props.brightness = AMDGPU_MAX_BL_LEVEL;