[PATCH 1/9] drm/fourcc: Add macro to check for the modifier vendor

[Thierry Reding <thierry.reding@gmail.com>]

From: Thierry Reding <treding@nvidia.com>

This is useful for checking at runtime whether a given modifier is from
a specific vendor so that any vendor-specific parsing can be done.

Signed-off-by: Thierry Reding <treding@nvidia.com>
---
 include/uapi/drm/drm_fourcc.h | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index f76de49c768f..567fd4566e08 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -366,6 +366,9 @@ extern "C" {
 
 #define DRM_FORMAT_RESERVED	      ((1ULL << 56) - 1)
 
+#define fourcc_mod_is_vendor(modifier, vendor) \
+	((((modifier) >> 56) & 0xff) == DRM_FORMAT_MOD_VENDOR_## vendor)
+
 #define fourcc_mod_code(vendor, val) \
 	((((__u64)DRM_FORMAT_MOD_VENDOR_## vendor) << 56) | ((val) & 0x00ffffffffffffffULL))
 
-- 
2.30.2