linux-kernel - Re: [PATCH] dmaengine/ste_dma40: clear LNK on channel startup

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Message-ID: <1325502837.1540.14.camel@vkoul-udesk3>
Date:	Mon, 02 Jan 2012 16:43:57 +0530
From:	Vinod Koul <vinod.koul@...el.com>
To:	Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
Cc:	linux-kernel@...r.kernel.org, linus.walleij@...ricsson.com,
	Rabin Vincent <rabin.vincent@...ricsson.com>
Subject: Re: [PATCH] dmaengine/ste_dma40: clear LNK on channel startup

On Wed, 2011-12-28 at 11:27 +0530, Narayanan G wrote:
> From: Rabin Vincent <rabin.vincent@...ricsson.com>
> 
> Otherwise if a previously physical channel is used as a logical channel, the
> LNK may have old values which affect the operation of the logical channel since
> the LNK register has different semantics between physical and logical channels.
> 
> Signed-off-by: Rabin Vincent <rabin.vincent@...ricsson.com>
> Reviewed-by: Jonas ABERG <jonas.aberg@...ricsson.com>
> Signed-off-by: Narayanan G <narayanan.gopalakrishnan@...ricsson.com>
> ---
>  drivers/dma/ste_dma40.c |    4 ++++
>  1 files changed, 4 insertions(+), 0 deletions(-)
> 
> diff --git a/drivers/dma/ste_dma40.c b/drivers/dma/ste_dma40.c
> index 972dc35..cc5ecbc
> --- a/drivers/dma/ste_dma40.c
> +++ b/drivers/dma/ste_dma40.c
> @@ -1104,6 +1104,10 @@ static void d40_config_write(struct d40_chan *d40c)
>  		/* Set LIDX for lcla */
>  		writel(lidx, chanbase + D40_CHAN_REG_SSELT);
>  		writel(lidx, chanbase + D40_CHAN_REG_SDELT);
> +
> +		/* Clear LNK which will be used by d40_chan_has_events() */
> +		writel(0, chanbase + D40_CHAN_REG_SSLNK);
> +		writel(0, chanbase + D40_CHAN_REG_SDLNK);
>  	}
>  }
>  
Applied, Thanks

-- 
~Vinod

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