linux-kernel - Re: [PATCH V3] dmaengine: sprd: add dma mask interface in probe

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Message-ID: <6ac60523-6623-3d0e-d56c-b13a0a8922c9@linux.alibaba.com>
Date:   Wed, 20 Sep 2023 16:12:20 +0800
From:   Baolin Wang <baolin.wang@...ux.alibaba.com>
To:     Kaiwei Liu <kaiwei.liu@...soc.com>, Vinod Koul <vkoul@...nel.org>,
        Orson Zhai <orsonzhai@...il.com>,
        Chunyan Zhang <zhang.lyra@...il.com>
Cc:     dmaengine@...r.kernel.org, linux-kernel@...r.kernel.org,
        kaiwei liu <liukaiwei086@...il.com>,
        Wenming Wu <wenming.wu@...soc.com>
Subject: Re: [PATCH V3] dmaengine: sprd: add dma mask interface in probe



On 9/19/2023 3:38 PM, Kaiwei Liu wrote:
> In the probe of DMA, the default addressing range is 32 bits,
> while the actual DMA hardware addressing range used is 36 bits.
> So add dma_set_mask_and_coherent function to match DMA
> addressing range.
> 
> Signed-off-by: Kaiwei Liu <kaiwei.liu@...soc.com>

LGTM.
Reviewed-by: Baolin Wang <baolin.wang@...ux.alibaba.com>

> ---
> Change in V2:
> -Change subject line.
> Change in V3:
> -Modify error message to make it more readable.
> ---
>   drivers/dma/sprd-dma.c | 9 +++++++++
>   1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/dma/sprd-dma.c b/drivers/dma/sprd-dma.c
> index 20c3cb1ef2f5..c371ce405f1d 100644
> --- a/drivers/dma/sprd-dma.c
> +++ b/drivers/dma/sprd-dma.c
> @@ -1115,6 +1115,15 @@ static int sprd_dma_probe(struct platform_device *pdev)
>   	u32 chn_count;
>   	int ret, i;
>   
> +	ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(36));
> +	if (ret) {
> +		ret = dma_set_mask_and_coherent(&pdev->dev, DMA_BIT_MASK(32));
> +		if (ret) {
> +			dev_err(&pdev->dev, "unable to set coherent mask to 32\n");
> +			return ret;
> +		}
> +	}
> +
>   	/* Parse new and deprecated dma-channels properties */
>   	ret = device_property_read_u32(&pdev->dev, "dma-channels", &chn_count);
>   	if (ret)