Modify vesa_get_brightness function to take into account nits_support
and based on that read the appropriate register and return the value.
Signed-off-by: Suraj Kandpal <suraj.kandpal@xxxxxxxxx>
---
.../drm/i915/display/intel_dp_aux_backlight.c | 20 +++++++++++++++++++
1 file changed, 20 insertions(+)
diff --git a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
index c5ff6e044866..ac9a69fe3f10 100644
--- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c
@@ -451,6 +451,26 @@ intel_dp_aux_hdr_setup_backlight(struct intel_connector *connector, enum pipe pi
/* VESA backlight callbacks */
static u32 intel_dp_aux_vesa_get_backlight(struct intel_connector *connector, enum pipe unused)
{
+ struct intel_dp *intel_dp = enc_to_intel_dp(connector->encoder);
+ struct intel_panel *panel = &connector->panel;
+ u8 buf[3];
+ u32 val = 0;
+ int ret;
+
+ if (panel->backlight.edp.vesa.nits_support) {
+ ret = drm_dp_dpcd_read(&intel_dp->aux, DP_EDP_PANEL_TARGET_LUMINANCE_VALUE, buf,
+ sizeof(buf));
+ if (ret < 0) {
+ drm_err(intel_dp->aux.drm_dev,
+ "[CONNECTOR:%d:%s] Failed to read brightness from DPCD\n",
+ connector->base.base.id, connector->base.name);
+ return 0;
+ }
+
+ val |= buf[0] | buf[1] << 8 | buf[2] << 16;
+ return val / 1000;
+ }
+
return connector->panel.backlight.level;
}
--
2.34.1
