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

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Message-ID: <86714c89-20ec-07c8-2569-65e78e8d584d@linaro.org>
Date:   Tue, 13 Nov 2018 10:12:16 +0200
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     mgottam@...eaurora.org
Cc:     Tomasz Figa <tfiga@...omium.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

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.

> 
>         if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE)
>                 pfmt[0].bytesperline = ALIGN(pixmp->width, 128);
> @@ -387,6 +387,7 @@ static int venc_s_fmt(struct file *file, void *fh,
> struct v4l2_format *f)
>         venc_try_fmt_common(inst, &format);
> 
>         if (f->type == V4L2_BUF_TYPE_VIDEO_OUTPUT_MPLANE) {
> +               inst->input_buf_size = pixmp->plane_fmt[0].sizeimage;
>                 inst->out_width = format.fmt.pix_mp.width;
>                 inst->out_height = format.fmt.pix_mp.height;
> 
> Similar implementation is already handled in case of decoder.
> 
> Then in queue setup, we can compare this against calculated size to
> obtain final buffer size
> 
> @@ -899,7 +900,8 @@ static int venc_queue_setup(struct vb2_queue *q,
>                 sizes[0] = venus_helper_get_framesz(inst->fmt_out->pixfmt,
>                                                     inst->width,
>                                                     inst->height);
> -               inst->input_buf_size = sizes[0];
> +               if(inst->input_buf_size < sizes[0])
> +                       inst->input_buf_size = sizes[0];
>                 break;
> 
> I hope this meets are requirements.

-- 
regards,
Stan