linux-kernel - Re: [PATCH v2 20/22] media: au0828 add enable, disable source handlers

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Date:	Tue, 9 Feb 2016 11:42:28 -0200
From:	Mauro Carvalho Chehab <mchehab@....samsung.com>
To:	Shuah Khan <shuahkh@....samsung.com>
Cc:	tiwai@...e.com, clemens@...isch.de, hans.verkuil@...co.com,
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Subject: Re: [PATCH v2 20/22] media: au0828 add enable, disable source
 handlers

Em Mon, 08 Feb 2016 16:00:26 -0700
Shuah Khan <shuahkh@....samsung.com> escreveu:

> >>> +	ret = __media_entity_pipeline_start(entity, pipe);
> >>> +	if (ret) {
> >>> +		pr_err("Start Pipeline: %s->%s Error %d\n",
> >>> +			source->name, entity->name, ret);
> >>> +		ret = __media_entity_setup_link(found_link, 0);
> >>> +		pr_err("Deactive link Error %d\n", ret);
> >>> +		goto end;
> >>> +	}  
> >>
> >> Hmm... isn't it to early to activate the pipeline here? My original
> >> guess is that, on the analog side, this should happen only at the stream
> >> on code. Wouldn't this break apps like mythTV?  
> 
> On analog side, there are a few ioctls that
> change the configuration on the tuner way
> before stream on step. Is there a reason to
> separate the setup_link() and pipeline_start()
> steps? I can separate these two steps, but I
> am not really seeing the reason for that.

I'm actually ok with that, provided that it won't break existing
apps. Did you test it with MythTV?

Regards,
Mauro