[lkml]   [2020]   [Apr]   [7]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
SubjectRe: [RFC PATCH v6 6/9] media: tegra: Add Tegra210 Video input driver
08.04.2020 01:08, Dmitry Osipenko пишет:
> 08.04.2020 00:08, Sowjanya Komatineni пишет:
> ...
>>>> I think you need a semaphore with resource count = 2.
>>> we hold on to issuing capture if more than 2 buffers are queued and it
>>> continues only after fifo has min 1 slot empty
>> Just want to close on this part of feedback. Hope above explanation is
>> clear regarding triggering/issuing at max 2 frame capture to VI HW and
>> also regarding capture threads where they use wait_event_interruptible
>> to prevent blocking waiting for buffers to be available for captures.
>> So no changes related to this part are needed in v7.
> From what I see in the code, you "hold on" by making kthread to spin in
> a busy-loop while caps_inflight >= SYNCPT_FIFO_DEPTH. So some change
> should be needed to prevent this.

Looks like some other media drivers do:


to avoid CPU hogging when contention is detected.

 \ /
  Last update: 2020-04-08 00:14    [W:0.195 / U:1.272 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site