Date:   Tue, 24 Jan 2023 23:38:55 +0100
From:   Michael Grzeschik <mgr@...gutronix.de>
To:     Nicolas Dufresne <nicolas.dufresne@...labora.com>
Cc:     Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Philipp Zabel <p.zabel@...gutronix.de>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Heiko Stuebner <heiko@...ech.de>,
        Hans Verkuil <hverkuil-cisco@...all.nl>, kernel@...labora.com,
        Robert Mader <robert.mader@...labora.com>,
        Mauro Carvalho Chehab <mchehab+samsung@...nel.org>,
        linux-media@...r.kernel.org, linux-rockchip@...ts.infradead.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] hantro: Fix JPEG encoder ENUM_FRAMESIZE on RK3399

On Fri, Dec 23, 2022 at 12:05:21PM -0500, Nicolas Dufresne wrote:
>Le vendredi 23 décembre 2022 à 13:28 -0300, Ezequiel Garcia a écrit :
>> Hi everyone,
>>
>> On Fri, Dec 23, 2022 at 11:17 AM Nicolas Dufresne
>> <nicolas.dufresne@...labora.com> wrote:
>> >
>> > The frmsize structure was left initialize to 0, as side effect, the driver was
>> > reporting an invalid frmsize.
>> >
>> >   Size: Stepwise 0x0 - 0x0 with step 0/0
>> >
>> > Fix this by replicating the constraints in the raw formats too. This fixes
>> > taking picture in Gnome Cheese Software, or any software using GSteamer
>> > encodebin feature.
>> >
>> > Fixes: 775fec69008d30 ("media: add Rockchip VPU JPEG encoder driver")
>>
>> The frmsize is only for bitstream formats (see comment in struct hantro_fmt).
>> If I can read code correctly, this was broken by this commit:
>>
>> commit 79c987de8b35421a2a975982929f150dd415f8f7
>> Author: Benjamin Gaignard <benjamin.gaignard@...labora.com>
>> Date:   Mon Apr 4 18:06:40 2022 +0200
>>
>>     media: hantro: Use post processor scaling capacities
>>
>> Before that commit we used to return EINVAL for enum_framesizes
>> in RAW formats. I guess we missed that :-)
>
>I see, and gstreamer had a quirk for such a bogus response. Let me explain why
>its bogus, for the general knowlege. A driver that supports ENUM_FRAMESIZE but
>does not return any sizes, is in theory a driver that does not support anything.
>Fortunaly, GStreamer considered not having a single framesize bogus, and would
>fallback to the old school try_fmt() dance to find the supported sizes.
>
>So yes, it used to work in gstreamer, and its indeed
>79c987de8b35421a2a975982929f150dd415f8f7 that broke it. I'll correct his in V2.
>
>>
>> To be completely honest, I'm not sure if we used to support encodebin,
>> and I'm not too sure how to approach this issue, but I would really
>> love to start with something super simple like:
>>
>> diff --git a/drivers/media/platform/verisilicon/hantro_v4l2.c
>> b/drivers/media/platform/verisilicon/hantro_v4l2.c
>> index 2c7a805289e7..0b28f86b7463 100644
>> --- a/drivers/media/platform/verisilicon/hantro_v4l2.c
>> +++ b/drivers/media/platform/verisilicon/hantro_v4l2.c
>> @@ -161,8 +161,11 @@ static int vidioc_enum_framesizes(struct file
>> *file, void *priv,
>>         }
>>
>>         /* For non-coded formats check if postprocessing scaling is possible */
>> -       if (fmt->codec_mode == HANTRO_MODE_NONE &&
>> hantro_needs_postproc(ctx, fmt)) {
>> -               return hanto_postproc_enum_framesizes(ctx, fsize);
>> +       if (fmt->codec_mode == HANTRO_MODE_NONE)
>> +        if (hantro_needs_postproc(ctx, fmt))
>> +            return hanto_postproc_enum_framesizes(ctx, fsize);
>> +        else
>> +            return -ENOTTY;
>>         } else if (fsize->index != 0) {
>>                 vpu_debug(0, "invalid frame size index (expected 0, got %d)\n",
>>                           fsize->index);
>>
>> (ENOTTY was suggested by Nicolas on IRC)
>>
>> Nicolas also pointed out that our current handling of frmsize is not correct,
>> as we cannot express different constraints on combinations of RAW
>> and bitstream formats.
>>
>> This seems to call for a rework of enum_framesizes, so frmsize
>> is not static but somehow obtained per-codec.
>
>So I'll respin along these line to we more or less "revert back" to working
>state. Though having a framesize enumeration on encoder raw (OUTPUT queue) is
>what makes most sense so that will have to be revisited with a corrected
>mechanism, as whenever we add VP8 and H.264 encoding, we'll need different range
>per codec. I'll check in January with my colleague, we might do that inside the
>VP8 encoder branch (that is nearly ready and will be sent after the holidays),
>or could be an intermediate set.

I just came across this discussion and found my very similar and somehow
forgotten patch the other day.

https://lore.kernel.org/linux-media/66839e0c4b19eb4faba5fbed5cd0a4ec0c8415f8.camel@ndufresne.ca/

Should I just send a v2 with the ENOTTY for now?

Thanks,
Michael

>> > Reported-by: Robert Mader <robert.mader@...labora.com>
>> > Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
>>
>> And thanks a lot for the report and the patch!
>>
>
>
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