linux-kernel - Re: [PATCH 04/11] media: exynos4-is: Correct missing entity function initialization

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Date:   Wed, 8 Jul 2020 17:34:29 +0200
From:   Sylwester Nawrocki <s.nawrocki@...sung.com>
To:     Tomasz Figa <tfiga@...omium.org>,
        Jonathan Bakker <xc-racer2@...e.ca>
Cc:     kyungmin.park@...sung.com, mchehab@...nel.org, kgene@...nel.org,
        krzk@...nel.org, linux-media@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-samsung-soc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 04/11] media: exynos4-is: Correct missing entity
 function initialization

Hi,

On 07.07.2020 20:09, Tomasz Figa wrote:
> On Sat, Apr 25, 2020 at 07:26:43PM -0700, Jonathan Bakker wrote:
>> Commit bae4500399c4 ("[media] exynos4-is: Add missing entity function
>> initialization") tried to suppress the warnings such as
>>
>> s5p-fimc-md camera: Entity type for entity FIMC.0 was not initialized!
>>
>> However, this didn't work in all cases.  Correct this by calling the set
>> function earlier.
>>
>> Fixes: bae4500399c4 ("exynos4-is: Add missing entity function initialization")
>> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
>> ---
>>  drivers/media/platform/exynos4-is/fimc-capture.c | 2 +-
>>  1 file changed, 1 insertion(+), 1 deletion(-)

> Thank you for the patch. Please see my comments inline.

>> diff --git a/drivers/media/platform/exynos4-is/fimc-capture.c b/drivers/media/platform/exynos4-is/fimc-capture.c
>> index 705f182330ca..86c233e2f2c9 100644
>> --- a/drivers/media/platform/exynos4-is/fimc-capture.c
>> +++ b/drivers/media/platform/exynos4-is/fimc-capture.c
>> @@ -1799,7 +1799,6 @@ static int fimc_register_capture_device(struct fimc_dev *fimc,
>>  	vid_cap->wb_fmt.code = fmt->mbus_code;
>>  
>>  	vid_cap->vd_pad.flags = MEDIA_PAD_FL_SINK;
>> -	vfd->entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;

I think we should leave above line as is, or perhaps change the function
to MEDIA_ENT_F_PROC_VIDEO_COMPOSER and...

> Isn't vfd->entity above a different entity than sd->entity below? If so,
> this line must stay.
> 
>>  	ret = media_entity_pads_init(&vfd->entity, 1, &vid_cap->vd_pad);
>>  	if (ret)
>>  		goto err_free_ctx;
>> @@ -1898,6 +1897,7 @@ int fimc_initialize_capture_subdev(struct fimc_dev *fimc)
>>  		return ret;
>>  
>>  	sd->entity.ops = &fimc_sd_media_ops;
>> +	sd->entity.function = MEDIA_ENT_F_PROC_VIDEO_SCALER;

...also add an assignment like this.

vfd->entity and sd->entity are different entities, vfd->entity corresponds to
the capture video node and sd->entity is the capture subdevice media entity. 

> My understanding is that this is the capture subdev and not the scaler.
> Looking at the other drivers, MEDIA_ENT_F_PROC_VIDEO_PIXEL_FORMATTER
> could be the right function to use here.

Scaling can also be configured on that subdev, actually both functions would
be valid.

-- 
Regards,
Sylwester