[Intel-gfx] [PATCH 5/5] drm/i915: Store brightness level in aux backlight driver

[Puthikorn Voravootivat]

Some panel will default to zero brightness when turning the
panel off and on again. This patch stores last brightness level
before turning off and set them back when panel is turning on.

Signed-off-by: Puthikorn Voravootivat <puthik at chromium.org>
---
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index 32b426006a6a..fd7258715c88 100644
--- a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
+++ b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
@@ -95,6 +95,7 @@ intel_dp_aux_set_backlight(struct intel_connector *connector, u32 level)
 		DRM_DEBUG_KMS("Failed to write aux backlight level\n");
 		return;
 	}
+	connector->panel.backlight.level = level;
 }
 
 /*
@@ -161,6 +162,7 @@ static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
 		drm_dp_dpcd_writeb(&intel_dp->aux, DP_EDP_BACKLIGHT_FREQ_SET,
 			0xff);
 	}
+	intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
 }
 
 static void intel_dp_aux_disable_backlight(struct intel_connector *connector)
-- 
2.12.0.246.ga2ecc84866-goog