drm/vmwgfx: Cleanup kms setup without 3d

Do not validate format equality for the non 3d cases to allow xrgb to
argb copies and make sure the dx binding flags are only used
on dx compatible surfaces.

Fixes basic 2d kms setup on configurations without 3d. There's little
practical benefit to it because kms framebuffer coherence is disabled
on configurations without 3d but with those changes the code actually
makes sense.

v2: Remove the now unused format variable

Signed-off-by: Zack Rusin <zack.rusin@broadcom.com>
Fixes: d6667f0 ("drm/vmwgfx: Fix handling of dumb buffers")
Cc: Broadcom internal kernel review list <bcm-kernel-feedback-list@broadcom.com>
Cc: dri-devel@lists.freedesktop.org
Cc: <stable@vger.kernel.org> # v6.9+
Cc: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Cc: Martin Krastev <martin.krastev@broadcom.com>
Reviewed-by: Martin Krastev <martin.krastev@broadcom.com>
Reviewed-by: Maaz Mombasawala <maaz.mombasawala@broadcom.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20240827043905.472825-1-zack.rusin@broadcom.com

Author: zackr

drivers/gpu/drm/vmwgfx/vmwgfx_kms.c

@@ -1283,7 +1283,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 {
 	struct drm_device *dev = &dev_priv->drm;
 	struct vmw_framebuffer_surface *vfbs;
-	enum SVGA3dSurfaceFormat format;
 	struct vmw_surface *surface;
 	int ret;
 
@@ -1320,34 +1319,6 @@ static int vmw_kms_new_framebuffer_surface(struct vmw_private *dev_priv,
 		return -EINVAL;
 	}
 
-	switch (mode_cmd->pixel_format) {
-	case DRM_FORMAT_ARGB8888:
-		format = SVGA3D_A8R8G8B8;
-		break;
-	case DRM_FORMAT_XRGB8888:
-		format = SVGA3D_X8R8G8B8;
-		break;
-	case DRM_FORMAT_RGB565:
-		format = SVGA3D_R5G6B5;
-		break;
-	case DRM_FORMAT_XRGB1555:
-		format = SVGA3D_A1R5G5B5;
-		break;
-	default:
-		DRM_ERROR("Invalid pixel format: %p4cc\n",
-			  &mode_cmd->pixel_format);
-		return -EINVAL;
-	}
-
-	/*
-	 * For DX, surface format validation is done when surface->scanout
-	 * is set.
-	 */
-	if (!has_sm4_context(dev_priv) && format != surface->metadata.format) {
-		DRM_ERROR("Invalid surface format for requested mode.\n");
-		return -EINVAL;
-	}
-
 	vfbs = kzalloc(sizeof(*vfbs), GFP_KERNEL);
 	if (!vfbs) {
 		ret = -ENOMEM;

drivers/gpu/drm/vmwgfx/vmwgfx_surface.c

@@ -2276,9 +2276,12 @@ int vmw_dumb_create(struct drm_file *file_priv,
 	const struct SVGA3dSurfaceDesc *desc = vmw_surface_get_desc(format);
 	SVGA3dSurfaceAllFlags flags = SVGA3D_SURFACE_HINT_TEXTURE |
 				      SVGA3D_SURFACE_HINT_RENDERTARGET |
-				      SVGA3D_SURFACE_SCREENTARGET |
-				      SVGA3D_SURFACE_BIND_SHADER_RESOURCE |
-				      SVGA3D_SURFACE_BIND_RENDER_TARGET;
+				      SVGA3D_SURFACE_SCREENTARGET;
+
+	if (vmw_surface_is_dx_screen_target_format(format)) {
+		flags |= SVGA3D_SURFACE_BIND_SHADER_RESOURCE |
+			 SVGA3D_SURFACE_BIND_RENDER_TARGET;
+	}
 
 	/*
 	 * Without mob support we're just going to use raw memory buffer