linux-kernel - Re: [PATCH 1/2] ahci: Check and set 64-bit DMA mask for platform AHCI driver

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Date:	Thu, 12 Jun 2014 21:47:25 +0400
From:	Sergei Shtylyov <sergei.shtylyov@...entembedded.com>
To:	suravee.suthikulpanit@....com, tj@...nel.org,
	b.zolnierkie@...sung.com
CC:	hdegoede@...hat.com, lho@....com, tphan@....com, stripathi@....com,
	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH 1/2] ahci: Check and set 64-bit DMA mask for platform
 AHCI driver

Hello.

On 06/12/2014 09:40 PM, suravee.suthikulpanit@....com wrote:

> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>

> The current platform AHCI driver does not set the dma_mask correctly
> for 64-bit DMA capable AHCI controller. This patch checks the AHCI
> capability bit and set the dma_mask and coherent_dma_mask accordingly.

> Signed-off-by: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> Reviewed-by: Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
> Reviewed-by: Hans de Goede <hdegoede@...hat.com>
> ---
>   drivers/ata/libahci_platform.c | 13 +++++++++++++
>   1 file changed, 13 insertions(+)

> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 3a5b4ed..a958a2b 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -364,6 +364,19 @@ int ahci_platform_init_host(struct platform_device *pdev,
>   			ap->ops = &ata_dummy_port_ops;
>   	}
>
> +	if (hpriv->cap & HOST_CAP_64) {
> +		rc = dma_coerce_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +		if (rc) {
> +			rc = dma_coerce_mask_and_coherent(dev,
> +							  DMA_BIT_MASK(32));
> +			if (rc) {
> +				dev_err(dev, "Failed to enable 64-bit DMA.\n");

    Not 32-bit?

> +				return rc;
> +			}
> +			dev_warn(dev, "Enable 32-bit DMA instead of 64-bit.\n");
> +		}
> +	}
> +

WBR, Sergei

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