linux-kernel - Re: [PATCH v2 2/2] dmaengine: omap-dma: Restore the CLINK

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Message-ID: <20140916135649.GF12379@n2100.arm.linux.org.uk>
Date:	Tue, 16 Sep 2014 14:56:50 +0100
From:	Russell King - ARM Linux <linux@....linux.org.uk>
To:	Peter Ujfalusi <peter.ujfalusi@...com>
Cc:	vinod.koul@...el.com, dan.j.williams@...el.com,
	dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
	linux-omap@...r.kernel.org
Subject: Re: [PATCH v2 2/2] dmaengine: omap-dma: Restore the CLINK_CTRL in
	resume path

On Tue, Sep 16, 2014 at 04:53:49PM +0300, Peter Ujfalusi wrote:
> When the audio stream is paused or suspended we stop the sDMA and when it
> is unpaused/resumed we start the channel without reconfiguring it.
> The omap_dma_stop() clears the link configuration when we pause the dma, but
> it is not setting it back on start. This will result only one audio buffer
> to be played back and the DMA will stop, since the linking is disabled.
> We need to restore the CLINK_CTRL register in case of resume.
> 
> Signed-off-by: Peter Ujfalusi <peter.ujfalusi@...com>

Both of these patches now look good, thanks.  For both:

Acked-by: Russell King <rmk+kernel@....linux.org.uk>

> ---
>  drivers/dma/omap-dma.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/dma/omap-dma.c b/drivers/dma/omap-dma.c
> index c01ea505ee7c..e0990c505889 100644
> --- a/drivers/dma/omap-dma.c
> +++ b/drivers/dma/omap-dma.c
> @@ -1019,6 +1019,9 @@ static int omap_dma_resume(struct omap_chan *c)
>  	if (c->paused) {
>  		mb();
>  
> +		/* Restore chanel link register */
> +		omap_dma_chan_write(c, CLNK_CTRL, c->desc->clnk_ctrl);
> +
>  		omap_dma_start(c, c->desc);
>  		c->paused = false;
>  	}
> -- 
> 2.1.0
> 

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