linux-kernel - Re: [PATCH] media: venus: add support for key frame

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Message-ID: <40d15ea4-48e2-b2c7-1d70-68dcc1b08990@linaro.org>
Date:   Fri, 12 Oct 2018 11:10:01 +0300
From:   Stanimir Varbanov <stanimir.varbanov@...aro.org>
To:     Alexandre Courbot <acourbot@...omium.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>,
        LKML <linux-kernel@...r.kernel.org>,
        linux-arm-msm@...r.kernel.org, vgarodia@...eaurora.org
Subject: Re: [PATCH] media: venus: add support for key frame



On 10/12/2018 11:06 AM, Alexandre Courbot wrote:
> On Fri, Oct 12, 2018 at 4:37 PM Stanimir Varbanov
> <stanimir.varbanov@...aro.org> wrote:
>>
>> Hi Alex,
>>
>> On 10/12/2018 08:26 AM, Alexandre Courbot wrote:
>>> On Tue, Oct 9, 2018 at 4:54 PM Malathi Gottam <mgottam@...eaurora.org> wrote:
>>>>
>>>> When client requests for a keyframe, set the property
>>>> to hardware to generate the sync frame.
>>>>
>>>> Signed-off-by: Malathi Gottam <mgottam@...eaurora.org>
>>>> ---
>>>>  drivers/media/platform/qcom/venus/venc_ctrls.c | 13 +++++++++++++
>>>>  1 file changed, 13 insertions(+)
>>>>
>>>> diff --git a/drivers/media/platform/qcom/venus/venc_ctrls.c b/drivers/media/platform/qcom/venus/venc_ctrls.c
>>>> index 45910172..f332c8e 100644
>>>> --- a/drivers/media/platform/qcom/venus/venc_ctrls.c
>>>> +++ b/drivers/media/platform/qcom/venus/venc_ctrls.c
>>>> @@ -81,6 +81,8 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
>>>>         struct venc_controls *ctr = &inst->controls.enc;
>>>>         u32 bframes;
>>>>         int ret;
>>>> +       void *ptr;
>>>> +       u32 ptype;
>>>>
>>>>         switch (ctrl->id) {
>>>>         case V4L2_CID_MPEG_VIDEO_BITRATE_MODE:
>>>> @@ -173,6 +175,14 @@ static int venc_op_s_ctrl(struct v4l2_ctrl *ctrl)
>>>>
>>>>                 ctr->num_b_frames = bframes;
>>>>                 break;
>>>> +       case V4L2_CID_MPEG_VIDEO_FORCE_KEY_FRAME:
>>>> +               ptype = HFI_PROPERTY_CONFIG_VENC_REQUEST_SYNC_FRAME;
>>>> +               ret = hfi_session_set_property(inst, ptype, ptr);
>>>
>>> The test bot already said it, but ptr is passed to
>>> hfi_session_set_property() uninitialized. And as can be expected the
>>> call returns -EINVAL on my board.
>>>
>>> Looking at other uses of HFI_PROPERTY_CONFIG_VENC_REQUEST_SYNC_FRAME I
>>> see that the packet sent to the firmware does not have room for an
>>> argument, so I tried to pass NULL but got the same result.
>>
>> yes, because pdata cannot be NULL. I'd suggest to make a pointer to
>> struct hfi_enable and pass it to the set_property function.
> 
> FWIW I also tried doing this and got the same error, strange...
> 

OK, when you calling the v4l control? It makes sense when you calling
it, because set_property checks does the session is on START state (i.e.
streamon on both queues).

-- 
regards,
Stan