drm/i915: VBT's child_device_config changes over time

[karo-tx-linux.git] / drivers / gpu / drm / i915 / intel_bios.h

diff --git a/drivers/gpu/drm/i915/intel_bios.h b/drivers/gpu/drm/i915/intel_bios.h
index e088d6f0956a87a239cf94ab31983359d0993f70..1da2bf208299727000116adef78d7802de4e2a5e 100644 (file)
--- a/drivers/gpu/drm/i915/intel_bios.h
+++ b/drivers/gpu/drm/i915/intel_bios.h
@@ -104,6 +104,7 @@ struct vbios_data {
 #define BDB_LVDS_LFP_DATA       42
 #define BDB_LVDS_BACKLIGHT      43
 #define BDB_LVDS_POWER          44
+#define BDB_MIPI                50
 #define BDB_SKIP               254 /* VBIOS private block, ignore */
 
 struct bdb_general_features {
@@ -201,7 +202,10 @@ struct bdb_general_features {
 #define DEVICE_PORT_DVOB       0x01
 #define DEVICE_PORT_DVOC       0x02
 
-struct child_device_config {
+/* We used to keep this struct but without any version control. We should avoid
+ * using it in the future, but it should be safe to keep using it in the old
+ * code. */
+struct old_child_dev_config {
        u16 handle;
        u16 device_type;
        u8  device_id[10]; /* ascii string */
@@ -223,6 +227,32 @@ struct child_device_config {
        u8  dvo_function;
 } __attribute__((packed));
 
+/* This one contains field offsets that are known to be common for all BDB
+ * versions. Notice that the meaning of the contents contents may still change,
+ * but at least the offsets are consistent. */
+struct common_child_dev_config {
+       u16 handle;
+       u16 device_type;
+       u8 not_common1[12];
+       u8 dvo_port;
+       u8 not_common2[2];
+       u8 ddc_pin;
+       u16 edid_ptr;
+} __attribute__((packed));
+
+/* This field changes depending on the BDB version, so the most reliable way to
+ * read it is by checking the BDB version and reading the raw pointer. */
+union child_device_config {
+       /* This one is safe to be used anywhere, but the code should still check
+        * the BDB version. */
+       u8 raw[33];
+       /* This one should only be kept for legacy code. */
+       struct old_child_dev_config old;
+       /* This one should also be safe to use anywhere, even without version
+        * checks. */
+       struct common_child_dev_config common;
+};
+
 struct bdb_general_definitions {
        /* DDC GPIO */
        u8 crt_ddc_gmbus_pin;
@@ -248,7 +278,7 @@ struct bdb_general_definitions {
         * number = (block_size - sizeof(bdb_general_definitions))/
         *           sizeof(child_device_config);
         */
-       struct child_device_config devices[0];
+       union child_device_config devices[0];
 } __attribute__((packed));
 
 struct bdb_lvds_options {
@@ -618,4 +648,44 @@ int intel_parse_bios(struct drm_device *dev);
 #define                PORT_IDPC       8
 #define                PORT_IDPD       9
 
+/* MIPI DSI panel info */
+struct bdb_mipi {
+       u16 panel_id;
+       u16 bridge_revision;
+
+       /* General params */
+       u32 dithering:1;
+       u32 bpp_pixel_format:1;
+       u32 rsvd1:1;
+       u32 dphy_valid:1;
+       u32 resvd2:28;
+
+       u16 port_info;
+       u16 rsvd3:2;
+       u16 num_lanes:2;
+       u16 rsvd4:12;
+
+       /* DSI config */
+       u16 virt_ch_num:2;
+       u16 vtm:2;
+       u16 rsvd5:12;
+
+       u32 dsi_clock;
+       u32 bridge_ref_clk;
+       u16 rsvd_pwr;
+
+       /* Dphy Params */
+       u32 prepare_cnt:5;
+       u32 rsvd6:3;
+       u32 clk_zero_cnt:8;
+       u32 trail_cnt:5;
+       u32 rsvd7:3;
+       u32 exit_zero_cnt:6;
+       u32 rsvd8:2;
+
+       u32 hl_switch_cnt;
+       u32 lp_byte_clk;
+       u32 clk_lane_switch_cnt;
+} __attribute__((packed));
+
 #endif /* _I830_BIOS_H_ */