linux-kernel - Re: [PATCH REPOST] TDA1997x: replace video detection routine

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Date:   Wed, 21 Jul 2021 09:56:05 +0200
From:   Krzysztof Hałasa <khalasa@...p.pl>
To:     Hans Verkuil <hverkuil@...all.nl>
Cc:     Tim Harvey <tharvey@...eworks.com>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        linux-media@...r.kernel.org, lkml <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH REPOST] TDA1997x: replace video detection routine

Hi Hans,

Hans Verkuil <hverkuil@...all.nl> writes:

>> --- a/drivers/media/i2c/tda1997x.c
>> +++ b/drivers/media/i2c/tda1997x.c
>> @@ -1092,66 +1094,71 @@ tda1997x_detect_std(struct tda1997x_state *state,
>>  		    struct v4l2_dv_timings *timings)

...

>> +	if (!timings)
>> +		return 0;
>
> This check isn't necessary, timings is never NULL.

Well, the tda1997x_irq_sus() does this:

	if (debug)
		tda1997x_detect_std(state, NULL);

Perhaps there is a better way, but I think I will leave it for now.
Also there is the issue of ignoring tda1997x_detect_std() return value,
but I can now see it's only a case in tda1997x_query_dv_timings(), easy
to fix.

Will post an update shortly.

Thanks for your comments,
-- 
Krzysztof "Chris" Hałasa

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