drm/amd/display: ignore modifiers when checking for format support

[Why&How]
There are cases where swizzle modes are set but modifiers arent. For
such a userspace, we need not check modifiers while checking
compatibilty in the drm hook for checking plane format.

Ignore checking modifiers but check the DCN generation for the
supported swizzle mode.

v2: squash in unused variable removal (Alex)
Signed-off-by: Aurabindo Pillai <aurabindo.pillai@amd.com>
Reviewed-by: Marek Olšák <marek.olsak@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm.c

@@ -4936,8 +4936,7 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
 {
 	struct amdgpu_device *adev = drm_to_adev(plane->dev);
 	const struct drm_format_info *info = drm_format_info(format);
-	int i;
-
+	struct hw_asic_id asic_id = adev->dm.dc->ctx->asic_id;
 	enum dm_micro_swizzle microtile = modifier_gfx9_swizzle_mode(modifier) & 3;
 
 	if (!info)
@@ -4953,13 +4952,53 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
 		return true;
 	}
 
-	/* Check that the modifier is on the list of the plane's supported modifiers. */
-	for (i = 0; i < plane->modifier_count; i++) {
-		if (modifier == plane->modifiers[i])
+	/* check if swizzle mode is supported by this version of DCN */
+	switch (asic_id.chip_family) {
+		case FAMILY_SI:
+		case FAMILY_CI:
+		case FAMILY_KV:
+		case FAMILY_CZ:
+		case FAMILY_VI:
+			/* asics before AI does not have modifier support */
+			return false;
+			break;
+		case FAMILY_AI:
+		case FAMILY_RV:
+		case FAMILY_NV:
+		case FAMILY_VGH:
+		case FAMILY_YELLOW_CARP:
+		case AMDGPU_FAMILY_GC_10_3_6:
+		case AMDGPU_FAMILY_GC_10_3_7:
+			switch (AMD_FMT_MOD_GET(TILE, modifier)) {
+				case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_D:
+					return true;
+					break;
+				default:
+					return false;
 					break;
 			}
-	if (i == plane->modifier_count)
+			break;
+		case AMDGPU_FAMILY_GC_11_0_0:
+			switch (AMD_FMT_MOD_GET(TILE, modifier)) {
+				case AMD_FMT_MOD_TILE_GFX11_256K_R_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_R_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_D_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_S_X:
+				case AMD_FMT_MOD_TILE_GFX9_64K_D:
+					return true;
+					break;
+				default:
 					return false;
+					break;
+			}
+			break;
+		default:
+			ASSERT(0); /* Unknown asic */
+			break;
+	}
 
 	/*
 	 * For D swizzle the canonical modifier depends on the bpp, so check