linux-kernel - Re: [PATCH] media: vivid: Support 480p for webcam capture

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Date:   Tue, 9 Oct 2018 15:01:09 +0900
From:   Keiichi Watanabe <keiichiw@...omium.org>
To:     Mauro Carvalho Chehab <mchehab+samsung@...nel.org>
Cc:     Hans Verkuil <hverkuil@...all.nl>,
        Kieran Bingham <kieran.bingham@...asonboard.com>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Tomasz Figa <tfiga@...omium.org>,
        Ricky Liang <jcliang@...omium.org>,
        Shik Chen <shik@...omium.org>
Subject: Re: [PATCH] media: vivid: Support 480p for webcam capture

Let me back to the topic about interval.
I'd like to send a nex version of this patch to avoid duplication of intervals.

We need to choose two intervals from the three options: 1/20, 2/25 and 1/40.
As Mauro said, we would want to have 2/25 for a fractional rate.
Then, I think adding 2/25 and 1/40 will work well.
If it's okay, I will send an updated version.

Best regards,
Kei

On Tue, Oct 9, 2018 at 4:00 AM, Mauro Carvalho Chehab
<mchehab+samsung@...nel.org> wrote:
> Em Mon, 8 Oct 2018 20:31:10 +0200
> Hans Verkuil <hverkuil@...all.nl> escreveu:
>
>> > (gdb) list *vivid_fillbuff+0x1e9b
>> > 0x1936b is in vivid_fillbuff (drivers/media/platform/vivid/vivid-kthread-cap.c:495).
>> > 490                                 ms % 1000,
>> > 491                                 buf->vb.sequence,
>> > 492                                 (dev->field_cap == V4L2_FIELD_ALTERNATE) ?
>> > 493                                         (buf->vb.field == V4L2_FIELD_TOP ?
>> > 494                                          " top" : " bottom") : "");
>> > 495                 tpg_gen_text(tpg, basep, line++ * line_height, 16, str);
>> > 496         }
>> > 497         if (dev->osd_mode == 0) {
>> > 498                 snprintf(str, sizeof(str), " %dx%d, input %d ",
>> > 499                                 dev->src_rect.width, dev->src_rect.height, dev->input);
>> >
>>
>> There is a bug with hflip handling in that function. Nothing to do with the
>> resolution. I could reproduce it by just checking the hflip control.
>> I'll investigate.
>
> Ah! Well, as I said, I got it only once last week while trying to use
> vivid for some event racing test. I didn't have time to actually
> seek. On that time, the bug only manifested when I changed the frame
> rate.
>
> Thanks,
> Mauro