drm/i915: parse eDP panel color depth from VBT block
Signed-off-by: Zhenyu Wang <zhenyuw@linux.intel.com>
Signed-off-by: Eric Anholt <eric@anholt.net>
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index b53c46f..15fbc1b 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -33,6 +33,8 @@
#define SLAVE_ADDR1 0x70
#define SLAVE_ADDR2 0x72
+static int panel_type;
+
static void *
find_section(struct bdb_header *bdb, int section_id)
{
@@ -128,6 +130,7 @@
dev_priv->lvds_dither = lvds_options->pixel_dither;
if (lvds_options->panel_type == 0xff)
return;
+ panel_type = lvds_options->panel_type;
lvds_lfp_data = find_section(bdb, BDB_LVDS_LFP_DATA);
if (!lvds_lfp_data)
@@ -406,6 +409,34 @@
}
static void
+parse_edp(struct drm_i915_private *dev_priv, struct bdb_header *bdb)
+{
+ struct bdb_edp *edp;
+
+ edp = find_section(bdb, BDB_EDP);
+ if (!edp) {
+ if (SUPPORTS_EDP(dev_priv->dev) && dev_priv->edp_support) {
+ DRM_DEBUG_KMS("No eDP BDB found but eDP panel supported,\
+ assume 18bpp panel color depth.\n");
+ dev_priv->edp_bpp = 18;
+ }
+ return;
+ }
+
+ switch ((edp->color_depth >> (panel_type * 2)) & 3) {
+ case EDP_18BPP:
+ dev_priv->edp_bpp = 18;
+ break;
+ case EDP_24BPP:
+ dev_priv->edp_bpp = 24;
+ break;
+ case EDP_30BPP:
+ dev_priv->edp_bpp = 30;
+ break;
+ }
+}
+
+static void
parse_device_mapping(struct drm_i915_private *dev_priv,
struct bdb_header *bdb)
{
@@ -522,6 +553,7 @@
parse_sdvo_device_mapping(dev_priv, bdb);
parse_device_mapping(dev_priv, bdb);
parse_driver_features(dev_priv, bdb);
+ parse_edp(dev_priv, bdb);
pci_unmap_rom(pdev, bios);