drm/panic: Add ABGR2101010 support

Add support for ABGR2101010, used by the nouveau driver.

Signed-off-by: Jocelyn Falempe <jfalempe@redhat.com>
Reviewed-by: Javier Martinez Canillas <javierm@redhat.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241022185553.1103384-2-jfalempe@redhat.com

Author: Jocelyn Falempe

drivers/gpu/drm/drm_panic.c

@@ -209,6 +209,14 @@ static u32 convert_xrgb8888_to_argb2101010(u32 pix)
 	return GENMASK(31, 30) /* set alpha bits */ | pix | ((pix >> 8) & 0x00300C03);
 }
 
+static u32 convert_xrgb8888_to_abgr2101010(u32 pix)
+{
+	pix = ((pix & 0x00FF0000) >> 14) |
+	      ((pix & 0x0000FF00) << 4) |
+	      ((pix & 0x000000FF) << 22);
+	return GENMASK(31, 30) /* set alpha bits */ | pix | ((pix >> 8) & 0x00300C03);
+}
+
 /*
  * convert_from_xrgb8888 - convert one pixel from xrgb8888 to the desired format
  * @color: input color, in xrgb8888 format
@@ -242,6 +250,8 @@ static u32 convert_from_xrgb8888(u32 color, u32 format)
 		return convert_xrgb8888_to_xrgb2101010(color);
 	case DRM_FORMAT_ARGB2101010:
 		return convert_xrgb8888_to_argb2101010(color);
+	case DRM_FORMAT_ABGR2101010:
+		return convert_xrgb8888_to_abgr2101010(color);
 	default:
 		WARN_ONCE(1, "Can't convert to %p4cc\n", &format);
 		return 0;