linux-kernel - Re: [PATCH resend] shdma: fixup sh_dmae_get

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Date:	Wed, 24 Jul 2013 10:43:44 +0200 (CEST)
From:	Guennadi Liakhovetski <g.liakhovetski@....de>
To:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
cc:	Olof Johansson <olof@...om.net>, Simon Horman <simon@...ms.net>,
	Linux-SH <linux-sh@...r.kernel.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH resend] shdma: fixup sh_dmae_get_partial() calculation
 error

Hi Morimoto-san

On Tue, 23 Jul 2013, Kuninori Morimoto wrote:

> sh_desc->hw.tcr is controlling real data size,
> and, register TCR is controlling data transfer count
> which was xmit_shifted value of hw.tcr.
> Current sh_dmae_get_partial() is calculating in different unit.
> This patch fixes it.
> 
> Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

Looks right to me

Acked-by: Guennadi Liakhovetski <g.liakhovetski+renesas@...il.com>

Thanks
Guennadi

> ---
> >> Guennadi
> 
> Could you please check this patch, and give it your Acked-by ?
> 
>  drivers/dma/sh/shdma.c |    4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/dma/sh/shdma.c b/drivers/dma/sh/shdma.c
> index b70709b..d670b8b 100644
> --- a/drivers/dma/sh/shdma.c
> +++ b/drivers/dma/sh/shdma.c
> @@ -388,8 +388,8 @@ static size_t sh_dmae_get_partial(struct shdma_chan *schan,
>  						    shdma_chan);
>  	struct sh_dmae_desc *sh_desc = container_of(sdesc,
>  					struct sh_dmae_desc, shdma_desc);
> -	return (sh_desc->hw.tcr - sh_dmae_readl(sh_chan, TCR)) <<
> -		sh_chan->xmit_shift;
> +	return sh_desc->hw.tcr -
> +		(sh_dmae_readl(sh_chan, TCR) << sh_chan->xmit_shift);
>  }
>  
>  /* Called from error IRQ or NMI */
> -- 
> 1.7.9.5
> 

---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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