linux-kernel - Re: [PATCH 05/11] media: exynos4-is: Improve support for sensors with multiple pads

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Message-ID: <BN6PR04MB0660ECFE03B17B96FB3BAC34A3620@BN6PR04MB0660.namprd04.prod.outlook.com>
Date:   Sat, 11 Jul 2020 11:21:29 -0700
From:   Jonathan Bakker <xc-racer2@...e.ca>
To:     Tomasz Figa <tfiga@...omium.org>
Cc:     kyungmin.park@...sung.com, s.nawrocki@...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 05/11] media: exynos4-is: Improve support for sensors with
 multiple pads

Hi Tomasz,

On 2020-07-07 11:13 a.m., Tomasz Figa wrote:
> Hi Jonathan,
> 
> On Sat, Apr 25, 2020 at 07:26:44PM -0700, Jonathan Bakker wrote:
>> Commit 1c9f5bd7cb8a ("[media] s5p-fimc: Add support for sensors with
>> multiple pads") caught the case where a sensor with multiple pads was
>> connected via CSIS, but missed the case where the sensor was directly
>> connected to the FIMC.
>>
>> This still assumes that the last pad of a sensor is the source.
>>
>> Signed-off-by: Jonathan Bakker <xc-racer2@...e.ca>
>> ---
>>  drivers/media/platform/exynos4-is/media-dev.c | 3 ++-
>>  1 file changed, 2 insertions(+), 1 deletion(-)
>>
> 
> Thank you for the patch. Please see my comments inline.
> 
>> diff --git a/drivers/media/platform/exynos4-is/media-dev.c b/drivers/media/platform/exynos4-is/media-dev.c
>> index 5c32abc7251b..b38445219c72 100644
>> --- a/drivers/media/platform/exynos4-is/media-dev.c
>> +++ b/drivers/media/platform/exynos4-is/media-dev.c
>> @@ -991,7 +991,8 @@ static int fimc_md_create_links(struct fimc_md *fmd)
>>  
>>  		case FIMC_BUS_TYPE_ITU_601...FIMC_BUS_TYPE_ITU_656:
>>  			source = &sensor->entity;
>> -			pad = 0;
>> +			/* Assume the last pad is the source */
>> +			pad = sensor->entity.num_pads - 1;
> 
> Is 0 really any worse than num_pads - 1? This sounds like quite an ugly
> hack.
> 
> Could you iterate over the pads of the sensor entity and explicitly find
> a source pad instead?

Yes, iterating would work better.  This comes from when I was trying to integrate
video-mux, before I realized I could connect multiple sensors.  I will drop this patch
from v2 as it's not necessary.

> 
> Best regards,
> Tomasz
> 

Thanks,
Jonathan