Add a quirk to assert the presence of a controllable backlight. Use it to
ignore the VBT backlight presence check during backlight setup.
Tested-by: James Duley <jagduley@xxxxxxxxx>
Signed-off-by: Scot Doyle <lkml14@xxxxxxxxxxxxx>
CC: Jani Nikula <jani.nikula@xxxxxxxxx>
---
diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 8cea596..723b1fe 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -657,6 +657,7 @@ enum intel_sbi_destination {
#define QUIRK_PIPEA_FORCE (1<<0)
#define QUIRK_LVDS_SSC_DISABLE (1<<1)
#define QUIRK_INVERT_BRIGHTNESS (1<<2)
+#define QUIRK_BACKLIGHT_PRESENT (1<<3)
struct intel_fbdev;
struct intel_fbc_work;
diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index 065984d..c583b07 100644
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -12290,6 +12290,14 @@ static void quirk_invert_brightness(struct drm_device *dev)
DRM_INFO("applying inverted panel brightness quirk\n");
}
+/* Some VBT's incorrectly indicate no backlight is present */
+static void quirk_backlight_present(struct drm_device *dev)
+{
+ struct drm_i915_private *dev_priv = dev->dev_private;
+ dev_priv->quirks |= QUIRK_BACKLIGHT_PRESENT;
+ DRM_INFO("applying backlight present quirk\n");
+}
+
struct intel_quirk {
int device;
int subsystem_vendor;
diff --git a/drivers/gpu/drm/i915/intel_panel.c b/drivers/gpu/drm/i915/intel_panel.c
index 38a9857..dfc6b5f 100644
--- a/drivers/gpu/drm/i915/intel_panel.c
+++ b/drivers/gpu/drm/i915/intel_panel.c
@@ -1118,8 +1118,13 @@ int intel_panel_setup_backlight(struct drm_connector *connector)
int ret;
if (!dev_priv->vbt.backlight.present) {
- DRM_DEBUG_KMS("native backlight control not available per VBT\n");
- return 0;
+ if (dev_priv->quirks & QUIRK_BACKLIGHT_PRESENT) {
+ DRM_DEBUG_KMS("no backlight present per VBT, but "
+ "present per quirk\n");
+ } else {
+ DRM_DEBUG_KMS("no backlight present per VBT\n");
+ return 0;
+ }
}
/* set level and max in panel struct */
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