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drm/dp: Modify drm_edp_backlight_set_level

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Modify drm_edp_backlight_set_level to be able to set the value
for register in DP_EDP_PANEL_TARGET_LUMINANCE_VALUE. We multiply
the level with 1000 since we get the value in Nits and the
register accepts it in milliNits.

--v2
-Add comment regarding the unit [Arun]

Signed-off-by: Suraj Kandpal <suraj.kandpal@intel.com>
Reviewed-by: Arun R Murthy <arun.r.murthy@intel.com>
Link: https://lore.kernel.org/r/20250620063445.3603086-9-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal 2025-06-20 12:04:40 +05:30
parent 2ff7f0c381
commit f2db78e37f
1 changed files with 12 additions and 4 deletions
repo.diff.show_diff_stats Download patch file Download diff file Expand all files Collapse all files

16
drivers/gpu/drm/display/drm_dp_helper.c
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@ -3944,20 +3944,28 @@ int drm_edp_backlight_set_level(struct drm_dp_aux *aux, const struct drm_edp_bac
u32 level)
{
int ret;
u8 buf[2] = { 0 };
unsigned int offset = DP_EDP_BACKLIGHT_BRIGHTNESS_MSB;
u8 buf[3] = { 0 };
/* The panel uses the PWM for controlling brightness levels */
if (!bl->aux_set)
if (!(bl->aux_set || bl->luminance_set))
return 0;
if (bl->lsb_reg_used) {
if (bl->luminance_set) {
level = level * 1000;
level &= 0xffffff;
buf[0] = (level & 0x0000ff);
buf[1] = (level & 0x00ff00) >> 8;
buf[2] = (level & 0xff0000) >> 16;
offset = DP_EDP_PANEL_TARGET_LUMINANCE_VALUE;
} else if (bl->lsb_reg_used) {
buf[0] = (level & 0xff00) >> 8;
buf[1] = (level & 0x00ff);
} else {
buf[0] = level;
}
ret = drm_dp_dpcd_write_data(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, sizeof(buf));
ret = drm_dp_dpcd_write_data(aux, offset, buf, sizeof(buf));
if (ret < 0) {
drm_err(aux->drm_dev,
"%s: Failed to write aux backlight level: %d\n",