mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
synced 2026-05-02 05:07:46 -04:00
dc9aec795f
Instead of switching capture mode depending on how many buffers are available use a scratch buffer and always run in continuous mode. By using a scratch buffer the responsiveness of the capture loop is increased as it can keep running even if there are no buffers available from userspace. As soon as a userspace queues a buffer it is inserted into the capture loop and returned as soon as it is filled. This is a improvement on the previous logic where the whole capture loop was stopped and switched to single capture mode if userspace did not feed the VIN driver buffers at the same time it consumed them. To make matters worse it was difficult for the driver to reenter continuous mode if it entered single mode even if userspace started to queue buffers faster. This resulted in suboptimal performance where if userspace where delayed for a short period the ongoing capture would be slowed down and run in single mode until the capturing process where restarted. An additional effect of this change is that the capture logic can be made much simple as we know that continuous mode will always be used. Signed-off-by: Niklas Söderlund <niklas.soderlund+renesas@ragnatech.se> Reviewed-by: Jacopo Mondi <jacopo+renesas@jmondi.org> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Signed-off-by: Mauro Carvalho Chehab <mchehab@s-opensource.com>
Linux kernel ============ This file was moved to Documentation/admin-guide/README.rst Please notice that there are several guides for kernel developers and users. These guides can be rendered in a number of formats, like HTML and PDF. In order to build the documentation, use ``make htmldocs`` or ``make pdfdocs``. There are various text files in the Documentation/ subdirectory, several of them using the Restructured Text markup notation. See Documentation/00-INDEX for a list of what is contained in each file. 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.