drm: Add missing DP DSC extended capability definitions.

Adding DP DSC register definitions, we might need for further
DSC implementation, supporting MST and DP branch pass-through mode.

v2: - Fixed checkpatch comment warning
v3: - Removed function which is not yet used(Jani Nikula)
Reviewed-by: Vinod Govindapillai <vinod.govindapillai@intel.com>
Signed-off-by: Stanislav Lisovskiy <stanislav.lisovskiy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20220905085744.29637-2-stanislav.lisovskiy@intel.com

include/drm/display/drm_dp.h

@@ -239,6 +239,9 @@
 
 #define DP_DSC_SUPPORT                      0x060   /* DP 1.4 */
 # define DP_DSC_DECOMPRESSION_IS_SUPPORTED  (1 << 0)
+# define DP_DSC_PASS_THROUGH_IS_SUPPORTED   (1 << 1)
+# define DP_DSC_DYNAMIC_PPS_UPDATE_SUPPORT_COMP_TO_COMP    (1 << 2)
+# define DP_DSC_DYNAMIC_PPS_UPDATE_SUPPORT_UNCOMP_TO_COMP  (1 << 3)
 
 #define DP_DSC_REV                          0x061
 # define DP_DSC_MAJOR_MASK                  (0xf << 0)
@@ -277,12 +280,15 @@
 
 #define DP_DSC_BLK_PREDICTION_SUPPORT       0x066
 # define DP_DSC_BLK_PREDICTION_IS_SUPPORTED (1 << 0)
+# define DP_DSC_RGB_COLOR_CONV_BYPASS_SUPPORT (1 << 1)
 
 #define DP_DSC_MAX_BITS_PER_PIXEL_LOW       0x067   /* eDP 1.4 */
 
 #define DP_DSC_MAX_BITS_PER_PIXEL_HI        0x068   /* eDP 1.4 */
 # define DP_DSC_MAX_BITS_PER_PIXEL_HI_MASK  (0x3 << 0)
 # define DP_DSC_MAX_BITS_PER_PIXEL_HI_SHIFT 8
+# define DP_DSC_MAX_BPP_DELTA_VERSION_MASK  0x06
+# define DP_DSC_MAX_BPP_DELTA_AVAILABILITY  0x08
 
 #define DP_DSC_DEC_COLOR_FORMAT_CAP         0x069
 # define DP_DSC_RGB                         (1 << 0)
@@ -344,11 +350,13 @@
 # define DP_DSC_24_PER_DP_DSC_SINK          (1 << 2)
 
 #define DP_DSC_BITS_PER_PIXEL_INC           0x06F
+# define DP_DSC_RGB_YCbCr444_MAX_BPP_DELTA_MASK 0x1f
+# define DP_DSC_RGB_YCbCr420_MAX_BPP_DELTA_MASK 0xe0
 # define DP_DSC_BITS_PER_PIXEL_1_16         0x0
 # define DP_DSC_BITS_PER_PIXEL_1_8          0x1
 # define DP_DSC_BITS_PER_PIXEL_1_4          0x2
 # define DP_DSC_BITS_PER_PIXEL_1_2          0x3
-# define DP_DSC_BITS_PER_PIXEL_1            0x4
+# define DP_DSC_BITS_PER_PIXEL_1_1          0x4
 
 #define DP_PSR_SUPPORT                      0x070   /* XXX 1.2? */
 # define DP_PSR_IS_SUPPORTED                1