linux-kernel - Re: [PATCH] media: venus: amend buffer size for bitstream plane

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Date:   Wed, 14 Nov 2018 12:51:33 +0900
From:   Tomasz Figa <tfiga@...omium.org>
To:     Stanimir Varbanov <stanimir.varbanov@...aro.org>
Cc:     mgottam@...eaurora.org, Hans Verkuil <hverkuil@...all.nl>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Linux Media Mailing List <linux-media@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-arm-msm <linux-arm-msm@...r.kernel.org>,
        Alexandre Courbot <acourbot@...omium.org>,
        vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: amend buffer size for bitstream plane

On Tue, Nov 13, 2018 at 7:46 PM Stanimir Varbanov
<stanimir.varbanov@...aro.org> wrote:
>
> Hi Tomasz,
>
> On 11/13/18 11:13 AM, Tomasz Figa wrote:
> > On Tue, Nov 13, 2018 at 5:12 PM Stanimir Varbanov
> > <stanimir.varbanov@...aro.org> wrote:
> >>
> >> Hi Malathi,
> >>
> >> On 11/13/18 9:28 AM, mgottam@...eaurora.org wrote:
> >>> On 2018-11-12 18:04, Stanimir Varbanov wrote:
> >>>> Hi Tomasz,
> >>>>
> >>>> On 10/23/2018 05:50 AM, Tomasz Figa wrote:
> >>>>> Hi Malathi,
> >>>>>
> >>>>> On Tue, Oct 9, 2018 at 4:58 PM Malathi Gottam
> >>>>> <mgottam@...eaurora.org> wrote:
> >>>>>>
> >>>>>> For lower resolutions, incase of encoder, the compressed
> >>>>>> frame size is more than half of the corresponding input
> >>>>>> YUV. Keep the size as same as YUV considering worst case.
> >>>>>>
> >>>>>> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
> >>>>>> ---
> >>>>>>  drivers/media/platform/qcom/venus/helpers.c | 2 +-
> >>>>>>  1 file changed, 1 insertion(+), 1 deletion(-)
> >>>>>>
> >>>>>> diff --git a/drivers/media/platform/qcom/venus/helpers.c
> >>>>>> b/drivers/media/platform/qcom/venus/helpers.c
> >>>>>> index 2679adb..05c5423 100644
> >>>>>> --- a/drivers/media/platform/qcom/venus/helpers.c
> >>>>>> +++ b/drivers/media/platform/qcom/venus/helpers.c
> >>>>>> @@ -649,7 +649,7 @@ u32 venus_helper_get_framesz(u32 v4l2_fmt, u32
> >>>>>> width, u32 height)
> >>>>>>         }
> >>>>>>
> >>>>>>         if (compressed) {
> >>>>>> -               sz = ALIGN(height, 32) * ALIGN(width, 32) * 3 / 2 / 2;
> >>>>>> +               sz = ALIGN(height, 32) * ALIGN(width, 32) * 3 / 2;
> >>>>>>                 return ALIGN(sz, SZ_4K);
> >>>>>>         }
> >>>>>
> >>>>> Note that the driver should not enforce one particular buffer size for
> >>>>> bitstream buffers unless it's a workaround for broken firmware or
> >>>>> hardware. The userspace should be able to select the desired size.
> >>>>
> >>>> Good point! Yes, we have to extend set_fmt to allow bigger sizeimage for
> >>>> the compressed buffers (not only for encoder).
> >>>
> >>> So Stan you meant to say that we should allow s_fmt to accept client
> >>> specified size?
> >>
> >> yes but I do expect:
> >>
> >> new_sizeimage = max(user_sizeimage, venus_helper_get_framesz)
> >>
> >> and also user_sizeimage should be sanitized.
> >>
> >>> If so should we set the inst->input_buf_size here in venc_s_fmt?
> >>>
> >>> @@ -333,10 +333,10 @@static const struct venus_format *
> >>> venc_try_fmt_common(struct venus_inst *inst, struct v4l2_format *f)
> >>>
> >>>         pixmp->num_planes = fmt->num_planes;
> >>>         pixmp->flags = 0;
> >>> -
> >>> -       pfmt[0].sizeimage = venus_helper_get_framesz(pixmp->pixelformat,
> >>> -                                                    pixmp->width,
> >>> -                                                    pixmp->height);
> >>> +       if (!pfmt[0].sizeimage)
> >>> +               pfmt[0].sizeimage =
> >>> venus_helper_get_framesz(pixmp->pixelformat,
> >>> +                                                            pixmp->width,
> >>> +
> >>> pixmp->height);
> >>
> >> yes, but please make
> >>
> >> pfmt[0].sizeimage = max(pfmt[0].sizeimage, venus_helper_get_framesz)
> >>
> >> and IMO this should be only for CAPTURE queue i.e. inst->output_buf_size
> >>
> >> I'm still not sure do we need it for OUTPUT encoder queue.
> >>
> >
> > This would be indeed only for the queues that operate on a coded
> > bitstream, i.e. both encoder CAPTURE and decoder OUTPUT.
>
> Thanks for the confirmation.
>
> >
> > For image formats, sizeimage should be calculated by the driver based
> > on the bytesperline and height. (Bytesperline may be fixed, if the
> > hardware doesn't support flexible strides, but if it does, it's
> > strongly recommended to use the bytesperline coming from the
> > application as the stride +/- any necessary sanity checks.)
>
> the hw should support stride but I'm not sure is that exposed by the
> firmware interface.

After thinking a bit more on this, there is actually some redundancy
between format width and crop width, since one should be normally able
to just set the format width to the buffer stride and crop to the
buffer width and have arbitrary strides supported (+/- hw alignment
requirements, but that's something that has to always be accounted
for).

Best regards,
Tomasz