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drm/dp: Modify drm_edp_probe_state

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Modify drm_edp_probe_state to read current level from
DP_EDP_PANEL_TARGET_LUMINANCE_VALUE. We divide it by
1000 since the value in this register is in millinits.

--v2
-Add comment on the unit sent back [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/20250620063445.3603086-7-suraj.kandpal@intel.com
This commit is contained in:
Suraj Kandpal
2025-06-20 12:04:38 +05:30
parent 9274a940f1
commit c38da578a8
1 changed files with 30 additions and 10 deletions
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40
drivers/gpu/drm/display/drm_dp_helper.c
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@@ -4193,7 +4193,7 @@ drm_edp_backlight_probe_state(struct drm_dp_aux *aux, struct drm_edp_backlight_i
u8 *current_mode)
{
int ret;
u8 buf[2];
u8 buf[3];
u8 mode_reg;
ret = drm_dp_dpcd_read_byte(aux, DP_EDP_BACKLIGHT_MODE_SET_REGISTER, &mode_reg);
@@ -4210,17 +4210,37 @@ drm_edp_backlight_probe_state(struct drm_dp_aux *aux, struct drm_edp_backlight_i
if (*current_mode == DP_EDP_BACKLIGHT_CONTROL_MODE_DPCD) {
int size = 1 + bl->lsb_reg_used;
ret = drm_dp_dpcd_read_data(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB, buf, size);
if (ret < 0) {
drm_dbg_kms(aux->drm_dev, "%s: Failed to read backlight level: %d\n",
aux->name, ret);
return ret;
if (bl->luminance_set) {
ret = drm_dp_dpcd_read_data(aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE,
buf, sizeof(buf));
if (ret < 0) {
drm_dbg_kms(aux->drm_dev,
"%s: Failed to read backlight level: %d\n",
aux->name, ret);
return ret;
}
if (bl->lsb_reg_used)
return (buf[0] << 8) | buf[1];
else
return buf[0];
/*
* Incase luminance is set we want to send the value back in nits but since
* DP_EDP_PANEL_TARGET_LUMINANCE stores values in millinits we need to divide
* by 1000.
*/
return (buf[0] | buf[1] << 8 | buf[2] << 16) / 1000;
} else {
ret = drm_dp_dpcd_read_data(aux, DP_EDP_BACKLIGHT_BRIGHTNESS_MSB,
buf, size);
if (ret < 0) {
drm_dbg_kms(aux->drm_dev,
"%s: Failed to read backlight level: %d\n",
aux->name, ret);
return ret;
}
if (bl->lsb_reg_used)
return (buf[0] << 8) | buf[1];
else
return buf[0];
}
}
/*