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

[David Milburn]

On 05/23/2014 12:35 PM, suravee.suthikulpanit@xxxxxxx wrote:
> From: Suravee Suthikulpanit <Suravee.Suthikulpanit@xxxxxxx>
>
> 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@xxxxxxx>
> ---
>   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,

Hi Suravee,

Would it be better to do the following before ahci_reset_controller()?

        /* initialize adapter */
        rc = ahci_configure_dma_masks(pdev, hpriv->cap & HOST_CAP_64);
        if (rc)
               	return rc;


Thanks,
David



>   	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);
>   }

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/