linux-kernel - Re: [PATCH AUTOSEL for 4.9 44/56] ASoC: dwc: Fix PIO mode initialization

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Message-ID: <69e1c0a5-df54-222f-cc48-44ec85ea95b5@synopsys.com>
Date:   Wed, 15 Nov 2017 14:06:45 +0000
From:   Jose Abreu <Jose.Abreu@...opsys.com>
To:     Mark Brown <broonie@...nel.org>
CC:     <alexander.levin@...izon.com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>
Subject: Re: [PATCH AUTOSEL for 4.9 44/56] ASoC: dwc: Fix PIO mode
 initialization

On 15-11-2017 13:20, Mark Brown wrote:
>
> Why on earth would anyone use audio hardware without DMA in production
> (or make it for that matter)?  Not that it really matters. 

That was my thought while I was implementing this. I guess HW
guys had their reasons.

>  Even if
> there are users on stable presumably the they're already running with
> something like this and it'll just conflict with this if it gets
> backported?  

Probably yes. I was never contacted about this PIO driver so
either they fixed it manually and never sent a patch or they are
not using it.

> The whole backport to enable a thing that never worked
> aspect of this seems out of scope for stable.

Ah, I reminded now that ARC PGU DRM driver (which is needed for
I2S audio to work) is totally broken in 4.9 because of some DRM
core changes and was never backported because the fix was simply
too large.

Yeah, I think given all these reasons we can drop this patch.

Best Regards,
Jose Miguel Abreu