[PATCH] drm/doc: document that PRIME import/export is always supported

[Simon Ser]

Since commit 6b85aa68d9d5 ("drm: Enable PRIME import/export for all
drivers"), import/export is always supported. Document this so that
user-space knows what to expect.

Signed-off-by: Simon Ser <contact at emersion.fr>
Cc: Thomas Zimmermann <tzimmermann at suse.de>
Cc: Alex Deucher <alexander.deucher at amd.com>
Cc: Jeffrey Hugo <quic_jhugo at quicinc.com>
Cc: Daniel Vetter <daniel.vetter at ffwll.ch>
---
 include/uapi/drm/drm.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/uapi/drm/drm.h b/include/uapi/drm/drm.h
index a87bbbbca2d4..56c194df527e 100644
--- a/include/uapi/drm/drm.h
+++ b/include/uapi/drm/drm.h
@@ -673,6 +673,9 @@ struct drm_gem_open {
  * Bitfield of supported PRIME sharing capabilities. See &DRM_PRIME_CAP_IMPORT
  * and &DRM_PRIME_CAP_EXPORT.
  *
+ * Starting from kernel version 6.6, both &DRM_PRIME_CAP_IMPORT and
+ * &DRM_PRIME_CAP_EXPORT are always advertised.
+ *
  * PRIME buffers are exposed as dma-buf file descriptors. See
  * Documentation/gpu/drm-mm.rst, section "PRIME Buffer Sharing".
  */
@@ -682,6 +685,8 @@ struct drm_gem_open {
  *
  * If this bit is set in &DRM_CAP_PRIME, the driver supports importing PRIME
  * buffers via the &DRM_IOCTL_PRIME_FD_TO_HANDLE ioctl.
+ *
+ * Starting from kernel version 6.6, this bit is always set in &DRM_CAP_PRIME.
  */
 #define  DRM_PRIME_CAP_IMPORT		0x1
 /**
@@ -689,6 +694,8 @@ struct drm_gem_open {
  *
  * If this bit is set in &DRM_CAP_PRIME, the driver supports exporting PRIME
  * buffers via the &DRM_IOCTL_PRIME_HANDLE_TO_FD ioctl.
+ *
+ * Starting from kernel version 6.6, this bit is always set in &DRM_CAP_PRIME.
  */
 #define  DRM_PRIME_CAP_EXPORT		0x2
 /**
-- 
2.41.0