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[v4,4/6] drm/i915: Store brightness level in aux backlight driver

Message ID 20170322225443.79343-5-puthik@chromium.org (mailing list archive)
State New, archived
Headers show

Commit Message

Puthikorn Voravootivat March 22, 2017, 10:54 p.m. UTC 
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.

Cc: Jani Nikula <jani.nikula@linux.intel.com>
Signed-off-by: Puthikorn Voravootivat <puthik@chromium.org>
---
 drivers/gpu/drm/i915/intel_dp_aux_backlight.c | 2 ++
 1 file changed, 2 insertions(+)
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Patch

diff --git a/drivers/gpu/drm/i915/intel_dp_aux_backlight.c b/drivers/gpu/drm/i915/intel_dp_aux_backlight.c
index ae1b6fe67feb..f99cf0a6ae44 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;
 }
 
 /*
@@ -150,6 +151,7 @@  static void intel_dp_aux_enable_backlight(struct intel_connector *connector)
 		drm_dp_dpcd_writeb(&intel_dp->aux,
 			DP_EDP_BACKLIGHT_MODE_SET_REGISTER, new_dpcd_buf);
 	}
+	intel_dp_aux_set_backlight(connector, connector->panel.backlight.level);
 }
 
 static void intel_dp_aux_disable_backlight(struct intel_connector *connector)