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Niklas Söderlund 59ac38804a media: rcar-vin: Use user provided buffers when starting 
[ Upstream commit a5991c4e94 ]

When adding an internal scratch buffer to improve buffer handling when
stopping it was also erroneously used when syncing at capture start.
This led to that the first three buffers captured were always dropped
as they were captured in the scratch buffer instead of in a buffer
provided by the user.

Allow the hardware to be given user provided buffers when preparing for
capture in the stopped state. This still allows the driver to sync with
the hardware and always completes the buffers to user-space in the
correct order as no buffers are completed before the sync is complete.
This change improves the driver as buffers are completed and given to
the user three frames earlier than before.

The change also fixes a warning produced by v4l2-compliance,

    warn: v4l2-test-buffers.cpp(448): got sequence number 3, expected 0

[hverkuil: fixed some typos in the Subject and the log message]

Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2023-04-19 16:57:09 +08:00
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README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.