[PATCH v3] drm/amdgpu: add comments to HW_IP_VCN_ENC

[Ruijing Dong]

>From VCN4, HW_IP_VCN_ENC will be used as unified queue,
and support both encoding and decoding jobs, HW_IP_VCN_DEC
is retired from VCN4.

link: https://gitlab.freedesktop.org/mesa/drm/-/merge_requests/245/commits

Signed-off-by: Ruijing Dong <ruijing.dong at amd.com>
---
 include/uapi/drm/amdgpu_drm.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/include/uapi/drm/amdgpu_drm.h b/include/uapi/drm/amdgpu_drm.h
index 18d3246d636e..29e4a1ece2ce 100644
--- a/include/uapi/drm/amdgpu_drm.h
+++ b/include/uapi/drm/amdgpu_drm.h
@@ -559,7 +559,14 @@ struct drm_amdgpu_gem_va {
 #define AMDGPU_HW_IP_VCE          4
 #define AMDGPU_HW_IP_UVD_ENC      5
 #define AMDGPU_HW_IP_VCN_DEC      6
+
+/**
+ * From VCN4, AMDGPU_HW_IP_VCN_ENC will be used as unified queue
+ * and support both encoding and decoding jobs, AMDGPU_HW_IP_VCN_DEC
+ * is retired from VCN4.
+ */
 #define AMDGPU_HW_IP_VCN_ENC      7
+
 #define AMDGPU_HW_IP_VCN_JPEG     8
 #define AMDGPU_HW_IP_NUM          9
 
-- 
2.25.1