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>

3 files changed, 73 insertions, 0 deletions

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index 5f781a74bf52..2c1669488b5a 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -283,6 +283,7 @@ typedef struct drm_i915_private {
         unsigned int lvds_use_ssc:1;
         unsigned int edp_support:1;
         int lvds_ssc_freq;
+        int edp_bpp;
 
         struct notifier_block lid_notifier;
 
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index b53c46f202f6..15fbc1b5a83e 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 @@ parse_lfp_panel_data(struct drm_i915_private *dev_priv,
         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 @@ parse_driver_features(struct drm_i915_private *dev_priv,
 }
 
 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 @@ intel_init_bios(struct drm_device *dev)
         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);
 
diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index 425ac9d7f724..4c18514f6f80 100644
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -98,6 +98,7 @@ struct vbios_data {
 #define BDB_SDVO_LVDS_PNP_IDS    24
 #define BDB_SDVO_LVDS_POWER_SEQ  25
 #define BDB_TV_OPTIONS           26
+#define BDB_EDP                  27
 #define BDB_LVDS_OPTIONS         40
 #define BDB_LVDS_LFP_DATA_PTRS   41
 #define BDB_LVDS_LFP_DATA        42
@@ -426,6 +427,45 @@ struct bdb_driver_features {
         u8 custom_vbt_version;
 } __attribute__((packed));
 
+#define EDP_18BPP       0
+#define EDP_24BPP       1
+#define EDP_30BPP       2
+#define EDP_RATE_1_62   0
+#define EDP_RATE_2_7    1
+#define EDP_LANE_1      0
+#define EDP_LANE_2      1
+#define EDP_LANE_4      3
+#define EDP_PREEMPHASIS_NONE    0
+#define EDP_PREEMPHASIS_3_5dB   1
+#define EDP_PREEMPHASIS_6dB     2
+#define EDP_PREEMPHASIS_9_5dB   3
+#define EDP_VSWING_0_4V         0
+#define EDP_VSWING_0_6V         1
+#define EDP_VSWING_0_8V         2
+#define EDP_VSWING_1_2V         3
+
+struct edp_power_seq {
+        u16 t3;
+        u16 t7;
+        u16 t9;
+        u16 t10;
+        u16 t12;
+} __attribute__ ((packed));
+
+struct edp_link_params {
+        u8 rate:4;
+        u8 lanes:4;
+        u8 preemphasis:4;
+        u8 vswing:4;
+} __attribute__ ((packed));
+
+struct bdb_edp {
+        struct edp_power_seq power_seqs[16];
+        u32 color_depth;
+        u32 sdrrs_msa_timing_delay;
+        struct edp_link_params link_params[16];
+} __attribute__ ((packed));
+
 bool intel_init_bios(struct drm_device *dev);
 
 /*