[Intel-gfx] [PATCH] drm/i915: Backlight control via VESA eDP aux interface

[Lee, Shawn C]

The latest VBT support backlight control via aux. We have to
check VBT's setting before doing backlight initialization.
Then Driver will assign correct callback function for eDP
backlight control.

Cc: Jani Nikula <jani.nikula at intel.com>
Cc: Jose Roberto de Souza <jose.souza at intel.com>
Cc: Cooper Chiou <cooper.chiou at intel.com>

Signed-off-by: Lee, Shawn C <shawn.c.lee at intel.com>
---
 drivers/gpu/drm/i915/intel_bios.c     | 3 ++-
 drivers/gpu/drm/i915/intel_vbt_defs.h | 6 ++++--
 2 files changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 1c037dfa83f5..27bda45520ec 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -317,7 +317,8 @@ parse_lfp_backlight(struct drm_i915_private *dev_priv,
 
 	entry = &backlight_data->data[panel_type];
 
-	dev_priv->vbt.backlight.present = entry->type == BDB_BACKLIGHT_TYPE_PWM;
+	dev_priv->vbt.backlight.present = (entry->type == BDB_BACKLIGHT_TYPE_PWM_SOC ||
+					   entry->type == BDB_BACKLIGHT_TYPE_PWM_VESA_EDP_AUX);
 	if (!dev_priv->vbt.backlight.present) {
 		DRM_DEBUG_KMS("PWM backlight not present in VBT (type %u)\n",
 			      entry->type);
diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
index 89ef14cafb6b..710f539f17de 100644
--- a/drivers/gpu/drm/i915/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
@@ -760,8 +760,10 @@ struct bdb_lvds_lfp_data {
  * Block 43 - LFP Backlight Control Data Block
  */
 
-#define BDB_BACKLIGHT_TYPE_NONE	0
-#define BDB_BACKLIGHT_TYPE_PWM	2
+#define BDB_BACKLIGHT_TYPE_NONE				0
+#define BDB_BACKLIGHT_TYPE_PWM_SOC			2
+#define BDB_BACKLIGHT_TYPE_PWM_PANEL_DRIVER_OLED	4
+#define BDB_BACKLIGHT_TYPE_PWM_VESA_EDP_AUX		5
 
 struct lfp_backlight_data_entry {
 	u8 type:2;
-- 
2.7.4