Hi Yunfei, On Wed, Jun 17, 2020 at 09:49:27AM +0800, Yunfei Dong wrote: > This patch adds support for the V4L2_BUF_CAP_SUPPORTS_RO_REQUESTS > flag. This flag is used for RO Request. I think this patch series lacks two major things: - a cover letter explaining the feature and what it is needed/useful for, - a user - is there an upstream driver which would implement this feature and benefit from it? Best regards, Tomasz