linux-kernel - Re: [RFC PATCH 01/13] misc: atmel_ssc: add device tree DMA support

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Message-ID: <CACQ1gAjNGsAWMwyL_9zEobKz=MEzgiA7Gqt=p4anuGhq2dLd_w@mail.gmail.com>
Date:	Fri, 5 Jul 2013 09:16:30 +0200
From:	Richard Genoud <richard.genoud@...il.com>
To:	Bo Shen <voice.shen@...el.com>
Cc:	devicetree-discuss@...ts.ozlabs.org,
	Nicolas Ferre <nicolas.ferre@...el.com>,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	Uwe Kleine-König 
	<u.kleine-koenig@...gutronix.de>
Subject: Re: [RFC PATCH 01/13] misc: atmel_ssc: add device tree DMA support

2013/7/5 Bo Shen <voice.shen@...el.com>:
> Yes, I aware this issue.
> Actually the system not hang, the resource all are occupied by the
> interrupt. This because, we enable the interrupt, when once interrupt occur,
> I try many methods to clear it, however we can not clear it. So, it
> generates the interrupt all the time. It seems the system hang.
>
> Temp solution: not enable the interrupt. use the following patch to disable
> the interrupt.
> ---8>---
> diff --git a/sound/soc/atmel/atmel_ssc_dai.c
> b/sound/soc/atmel/atmel_ssc_dai.c
> index 0ecf356..bb53dea 100644
> --- a/sound/soc/atmel/atmel_ssc_dai.c
> +++ b/sound/soc/atmel/atmel_ssc_dai.c
> @@ -649,7 +649,7 @@ static int atmel_ssc_prepare(struct snd_pcm_substream
> *substream,
>         dma_params = ssc_p->dma_params[dir];
>
>         ssc_writel(ssc_p->ssc->regs, CR, dma_params->mask->ssc_enable);
> -       ssc_writel(ssc_p->ssc->regs, IER, dma_params->mask->ssc_error);
> +       ssc_writel(ssc_p->ssc->regs, IDR, dma_params->mask->ssc_error);
>
>         pr_debug("%s enabled SSC_SR=0x%08x\n",
>                         dir ? "receive" : "transmit",
> ---<8---
>
> BTW, I am checking this with our IP team, if find the real solution, I will
> fix it.

ok, I'll rebase my patches on that.

Thanks !

Best Regards,
Richard
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