Revert "drm/amdgpu: Ensure that the modifier requested is supported by plane."

This reverts commit f4a9be99.

The original commit was found to cause the following two issues
on sienna cichlid:
1. Refresh rate locked during vrrdemo
2. Display sticks on flipped landscape mode after changing
   orientation, and cannot be changed back to regular landscape
Signed-off-by: Qingqing Zhuo <qingqing.zhuo@amd.com>
Reviewed-by: Rodrigo Siqueira <Rodrigo.Siqueira@amd.com>
Signed-off-by: Alex Deucher <alexander.deucher@amd.com>

drivers/gpu/drm/amd/amdgpu/amdgpu_display.c

@@ -908,19 +908,6 @@ int amdgpu_display_gem_fb_verify_and_init(
 					 &amdgpu_fb_funcs);
 	if (ret)
 		goto err;
-	/* Verify that the modifier is supported. */
-	if (!drm_any_plane_has_format(dev, mode_cmd->pixel_format,
-				      mode_cmd->modifier[0])) {
-		struct drm_format_name_buf format_name;
-		drm_dbg_kms(dev,
-			    "unsupported pixel format %s / modifier 0x%llx\n",
-			    drm_get_format_name(mode_cmd->pixel_format,
-						&format_name),
-			    mode_cmd->modifier[0]);
-
-		ret = -EINVAL;
-		goto err;
-	}
 
 	ret = amdgpu_display_framebuffer_init(dev, rfb, mode_cmd, obj);
 	if (ret)

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

@@ -4225,7 +4225,6 @@ 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;
 
 	enum dm_micro_swizzle microtile = modifier_gfx9_swizzle_mode(modifier) & 3;
 
@@ -4233,22 +4232,11 @@ static bool dm_plane_format_mod_supported(struct drm_plane *plane,
 		return false;
 
 	/*
-	 * We always have to allow these modifiers:
-	 * 1. Core DRM checks for LINEAR support if userspace does not provide modifiers.
-	 * 2. Not passing any modifiers is the same as explicitly passing INVALID.
+	 * We always have to allow this modifier, because core DRM still
+	 * checks LINEAR support if userspace does not provide modifers.
 	 */
-	if (modifier == DRM_FORMAT_MOD_LINEAR ||
-	    modifier == DRM_FORMAT_MOD_INVALID) {
+	if (modifier == DRM_FORMAT_MOD_LINEAR)
 		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])
-			break;
-	}
-	if (i == plane->modifier_count)
-		return false;
 
 	/*
 	 * The arbitrary tiling support for multiplane formats has not been hooked