linux-kernel - Re: [PATCH 1/1] dmaengine: dw: fix nollp issue

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Date:	Sun, 27 Sep 2015 20:12:06 -0700
From:	Viresh Kumar <viresh.kumar@...aro.org>
To:	yitian <yitian.bu@...gramtek.com>
Cc:	vireshk@...nel.org,
	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>,
	"vinod.koul@...el.com" <vinod.koul@...el.com>,
	Dan Williams <dan.j.williams@...el.com>,
	dmaengine@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-arm-kernel@...ts.infradead.org" 
	<linux-arm-kernel@...ts.infradead.org>
Subject: Re: [PATCH 1/1] dmaengine: dw: fix nollp issue

On Sun, Sep 27, 2015 at 7:55 PM, yitian <yitian.bu@...gramtek.com> wrote:
> when channel number is less than maximum number, the register
> address of all channels is wrong, which causes the "nollp" flag
> is set for all channels even if HW supports llp.
>
> Signed-off-by: Yitian Bu <yitian.bu@...gramtek.com>
> ---
>  drivers/dma/dw/core.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
> index cf1c87f..c2e9ac8 100644
> --- a/drivers/dma/dw/core.c
> +++ b/drivers/dma/dw/core.c
> @@ -1591,7 +1591,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct
> dw_dma_platform_data *pdata)
>         INIT_LIST_HEAD(&dw->dma.channels);
>         for (i = 0; i < nr_channels; i++) {
>                 struct dw_dma_chan      *dwc = &dw->chan[i];
> -               int                     r = nr_channels - i - 1;
> +               int                     r = DW_DMA_MAX_NR_CHANNELS - i - 1;
>
>                 dwc->chan.device = &dw->dma;
>                 dma_cookie_init(&dwc->chan);

Acked-by: Viresh Kumar <viresh.kumar@...aro.org>
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