HP DreamColor panel needs to be controlled via AUX interface. However, it has both DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP and DP_EDP_BACKLIGHT_BRIGHTNESS_PWM_PIN_CAP set, so it fails to pass intel_dp_aux_display_control_capable() test.
Skip the test if the panel has force DPCD quirk.
Signed-off-by: Kai-Heng Feng kai.heng.feng@canonical.com --- drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c | 10 ++++++---- 1 file changed, 6 insertions(+), 4 deletions(-)
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 acbd7eb66cbe..acf2e1c65290 100644 --- a/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c +++ b/drivers/gpu/drm/i915/display/intel_dp_aux_backlight.c @@ -347,9 +347,13 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector) struct intel_panel *panel = &intel_connector->panel; struct intel_dp *intel_dp = enc_to_intel_dp(intel_connector->encoder); struct drm_i915_private *i915 = dp_to_i915(intel_dp); + bool force_dpcd; + + force_dpcd = drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks, + DP_QUIRK_FORCE_DPCD_BACKLIGHT);
if (i915->params.enable_dpcd_backlight == 0 || - !intel_dp_aux_display_control_capable(intel_connector)) + (!force_dpcd && !intel_dp_aux_display_control_capable(intel_connector))) return -ENODEV;
/* @@ -358,9 +362,7 @@ int intel_dp_aux_init_backlight_funcs(struct intel_connector *intel_connector) */ if (i915->vbt.backlight.type != INTEL_BACKLIGHT_VESA_EDP_AUX_INTERFACE && - i915->params.enable_dpcd_backlight != 1 && - !drm_dp_has_quirk(&intel_dp->desc, intel_dp->edid_quirks, - DP_QUIRK_FORCE_DPCD_BACKLIGHT)) { + i915->params.enable_dpcd_backlight != 1 && !force_dpcd) { drm_info(&i915->drm, "Panel advertises DPCD backlight support, but " "VBT disagrees. If your backlight controls "