intel/isl: Support the XeHP media compression format

The format on this platform is slightly different from the one used on
TGL. Also it's part of the surface state instead of an aux-map.

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/14355>

src/intel/isl/isl.h

@@ -1631,6 +1631,13 @@ struct isl_surf_fill_state_info {
    enum isl_aux_usage aux_usage;
    uint64_t aux_address;
 
+   /**
+    * The format to use for decoding media compression.
+    *
+    * Used together with the surface format.
+    */
+   enum isl_format mc_format;
+
    /**
     * The clear color for this surface
     *

src/intel/isl/isl_surface_state.c

@@ -120,6 +120,40 @@ get_surftype(enum isl_surf_dim dim, isl_surf_usage_flags_t usage)
    }
 }
 
+#if GFX_VERx10 >= 125
+static uint8_t
+get_media_compression_format(enum isl_format format,
+                             enum isl_format lowered_format)
+{
+   const uint32_t plane_bpb = isl_format_get_layout(lowered_format)->bpb;
+
+   /* From Bspec 43868, Enumeration_MediaCompressionFormat:
+    *
+    *    Luma P010 has MSB of 0 while chroma P010 has MSB of 1.
+    *    Luma P016 has MSB of 0 while chroma P016 has MSB of 1.
+    *    Luma NV12 has MSB of 0 while chroma NV12 has MSB of 1.
+    */
+   switch (format) {
+   case ISL_FORMAT_PLANAR_420_8: /* NV12 */
+      assert(plane_bpb == 8 || plane_bpb == 16);
+      assert((isl_format_get_aux_map_encoding(format) & 0xf0) == 0);
+
+      /* drm_fourcc.h defines the chroma plane of NV12 as 16-bpb */
+      return (plane_bpb == 16) << 4 | isl_format_get_aux_map_encoding(format);
+   case ISL_FORMAT_PLANAR_420_10:
+   case ISL_FORMAT_PLANAR_420_12:
+   case ISL_FORMAT_PLANAR_420_16:
+      assert(plane_bpb == 16 || plane_bpb == 32);
+      assert((isl_format_get_aux_map_encoding(format) & 0xf0) == 0);
+
+      /* drm_fourcc.h defines the chroma plane of P01X as 32-bpb */
+      return (plane_bpb == 32) << 4 | isl_format_get_aux_map_encoding(format);
+   default:
+      return isl_format_get_aux_map_encoding(format);
+   }
+}
+#endif
+
 void
 isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
                             const struct isl_surf_fill_state_info *restrict info)
@@ -552,8 +586,13 @@ isl_genX(surf_fill_state_s)(const struct isl_device *dev, void *state,
       }
 
 #if GFX_VERx10 >= 125
-      s.CompressionFormat =
-         isl_get_render_compression_format(info->surf->format);
+      if (info->aux_usage == ISL_AUX_USAGE_MC) {
+         s.CompressionFormat =
+            get_media_compression_format(info->mc_format, info->surf->format);
+      } else {
+         s.CompressionFormat =
+            isl_get_render_compression_format(info->surf->format);
+      }
 #endif
 #if GFX_VER >= 12
       s.MemoryCompressionEnable = info->aux_usage == ISL_AUX_USAGE_MC;