linux-kernel - Re: [PATCHv2 3/3] media: uvcvideo: add UVC 1.5 ROI control

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Message-ID: <YFQ4HuavL7R6VPha@google.com>
Date:   Fri, 19 Mar 2021 14:35:26 +0900
From:   Sergey Senozhatsky <senozhatsky@...omium.org>
To:     Ricardo Ribalda <ribalda@...omium.org>
Cc:     Ricardo Ribalda Delgado <ricardo.ribalda@...il.com>,
        Laurent Pinchart <laurent.pinchart@...asonboard.com>,
        Tomasz Figa <tfiga@...omium.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media <linux-media@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Sergey Senozhatsky <senozhatsky@...omium.org>
Subject: Re: [PATCHv2 3/3] media: uvcvideo: add UVC 1.5 ROI control

On (21/03/18 22:19), Ricardo Ribalda wrote:
> >
> > May I please ask for more opinions on this?
> 
> Could you try setting the roi in a loop in your device and verify that
> it accepts all the values with no modification. If so we can implement
> the set/get as a quirk for other devices.

Tested on two (very) different devices.

Firmware D:

   CLAP all passed, we are cool

Firmware H:

   CLAP all passed, we are cool


Code sample

---
       in_selection.target     = V4L2_SEL_TGT_ROI;
       in_selection.flags      = V4L2_SEL_FLAG_ROI_AUTO_EXPOSURE;

       for (int i = 0; i < 1001; i++) {
               in_selection.r.left     = 0 + i;
               in_selection.r.top      = 0 + i;
               in_selection.r.width    = 42 + i;
               in_selection.r.height   = 42 + i;

               ret = doioctl(fd, VIDIOC_S_SELECTION, &in_selection);
               if (ret) {
                       fprintf(stderr, "BOOM %d\n", ret);
                       exit(1);
               }

               ret = doioctl(fd, VIDIOC_G_SELECTION, &in_selection);
               if (ret) {
                       fprintf(stderr, "BANG %d\n", ret);
                       exit(2);
               }

               if (in_selection.r.left != i ||
                   in_selection.r.top != i ||
                   in_selection.r.width != i + 42 ||
                   in_selection.r.height != i + 42) {

                       fprintf(stderr, "SNAP %d %d %d %d != %d %d %d %d\n",
                               i, i, i + 42, i + 42,
                               in_selection.r.left,
                               in_selection.r.top,
                               in_selection.r.width,
                               in_selection.r.height);
                       exit(3);
               }
       }

       fprintf(stderr, "CLAP all passed, we are cool\n");
---