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

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Date:	Tue, 3 Jun 2014 13:58:27 -0400
From:	Tejun Heo <tj@...nel.org>
To:	suravee.suthikulpanit@....com
Cc:	linux-ide@...r.kernel.org, linux-kernel@...r.kernel.org,
	Hans de Goede <hdegoede@...hat.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
Subject: Re: [PATCH 1/1] ata: Check and set 64-bit DMA mask for platform AHCI
 driver

Hans, Bartlomiej, can you guys please review this patch?

Thanks.

On Fri, May 23, 2014 at 12:35:10PM -0500, suravee.suthikulpanit@....com wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@....com>
> 
> The current platform AHCI drier 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>
> ---
>  drivers/ata/libahci_platform.c | 9 +++++++++
>  1 file changed, 9 insertions(+)
> 
> diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
> index 7cb3a85..85049ef 100644
> --- a/drivers/ata/libahci_platform.c
> +++ b/drivers/ata/libahci_platform.c
> @@ -368,6 +368,15 @@ int ahci_platform_init_host(struct platform_device *pdev,
>  	ahci_init_controller(host);
>  	ahci_print_info(host, "platform");
>  
> +	if (hpriv->cap & HOST_CAP_64) {
> +		if (!dev->dma_mask)
> +			dev->dma_mask = &dev->coherent_dma_mask;
> +
> +		rc = dma_set_mask_and_coherent(dev, DMA_BIT_MASK(64));
> +		if (rc)
> +			return rc;
> +	}
> +
>  	return ata_host_activate(host, irq, ahci_interrupt, IRQF_SHARED,
>  				 &ahci_platform_sht);
>  }
> -- 
> 1.9.0
> 
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-- 
tejun
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