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

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Date:	Fri, 13 Jun 2014 22:21:10 +0200
From:	Hans de Goede <hdegoede@...hat.com>
To:	suravee.suthikulpanit@....com, tj@...nel.org,
	b.zolnierkie@...sung.com
CC:	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

Hi,

On 06/12/2014 07:40 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>

I see no adverse effects from this on sunxi, please drop the
Reviewed-by: Hans .... tag and replace it with:

Tested-by: Hans de Goede <hdegoede@...hat.com>

Regards,

Hans



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