linux-kernel - [PATCH v5 1/3] docs: ext-ctrls-codec: Document cyclic intra-refresh zero control value

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Date:   Tue, 22 Jun 2021 14:39:56 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-arm-msm@...r.kernel.org
Cc:     Ezequiel Garcia <ezequiel@...labora.com>,
        nicolas.dufresne@...labora.com,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Stanimir Varbanov <stanimir.varbanov@...aro.org>
Subject: [PATCH v5 1/3] docs: ext-ctrls-codec: Document cyclic intra-refresh zero control value

In all drivers _CYCLIC_INTRA_REFRESH_MB default control value is zero
which means that the macroblocks will not be intra-refreshed. Document
this _CYCLIC_INTRA_REFRESH_MB control behaviour in control description.

Signed-off-by: Stanimir Varbanov <stanimir.varbanov@...aro.org>
---
 Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
index 8c6e2a11ed95..addf44b99dfa 100644
--- a/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
+++ b/Documentation/userspace-api/media/v4l/ext-ctrls-codec.rst
@@ -1174,7 +1174,9 @@ enum v4l2_mpeg_video_h264_entropy_mode -
     Cyclic intra macroblock refresh. This is the number of continuous
     macroblocks refreshed every frame. Each frame a successive set of
     macroblocks is refreshed until the cycle completes and starts from
-    the top of the frame. Applicable to H264, H263 and MPEG4 encoder.
+    the top of the frame. Setting this control to zero means that
+    macroblocks will not be refreshed.
+    Applicable to H264, H263 and MPEG4 encoder.
 
 ``V4L2_CID_MPEG_VIDEO_FRAME_RC_ENABLE (boolean)``
     Frame level rate control enable. If this control is disabled then
-- 
2.25.1