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

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Date:   Wed, 15 Nov 2017 10:54:51 +0000
From:   Mark Brown <broonie@...nel.org>
To:     alexander.levin@...izon.com
Cc:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "stable@...r.kernel.org" <stable@...r.kernel.org>,
        Jose Abreu <Jose.Abreu@...opsys.com>,
        Jose Abreu <joabreu@...opsys.com>
Subject: Re: [PATCH AUTOSEL for 4.9 44/56] ASoC: dwc: Fix PIO mode
 initialization

On Wed, Nov 15, 2017 at 02:45:45AM +0000, alexander.levin@...izon.com wrote:

> We can no longer rely on the return value of
> devm_snd_dmaengine_pcm_register(...) to check if the DMA
> handle is declared in the DT.

> Previously this check activated PIO mode but currently
> dma_request_chan returns either a valid channel or -EPROBE_DEFER.

So when did the corresponding change to the dmaengine API go in?

> In order to activate PIO mode check instead if the interrupt
> line is declared. This reflects better what is documented in
> the DT bindings (see Documentation/devicetree/bindings/sound/
> designware-i2s.txt).

> Also, initialize use_pio variable which was never being set
> causing PIO mode to never work.

Though if PIO mode never worked presumably this isn't that urgent...

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