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

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Message-ID: <20130730084957.GA17209@verge.net.au>
Date:	Tue, 30 Jul 2013 17:49:58 +0900
From:	Simon Horman <horms@...ge.net.au>
To:	Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Cc:	Olof Johansson <olof@...om.net>,
	Linux-SH <linux-sh@...r.kernel.org>,
	Guennadi <g.liakhovetski@....de>, linux-kernel@...r.kernel.org,
	Vinod Koul <vinod.koul@...el.com>
Subject: Re: [PATCH resend] shdma: fixup sh_dmae_get_partial() calculation
 error

[ Cc Vinod ]

On Tue, Jul 23, 2013 at 11:12:41PM -0700, 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>

Can I confirm that this was a regression introduced by
4f46f8ac80416b0e8fd3aba6a0d842205fb29140                   
("dmaengine: shdma: restore partial transfer calculation") ?

> ---
> >> 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
> 
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