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

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Date:	Fri, 6 Jun 2014 11:10:58 -0500
From:	Suravee Suthikulanit <suravee.suthikulpanit@....com>
To:	Tejun Heo <tj@...nel.org>, Hans de Goede <hdegoede@...hat.com>,
	Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
CC:	<linux-ide@...r.kernel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH 1/1] ata: Check and set 64-bit DMA mask for platform AHCI
 driver

Hans/Bartlomiej,

Do you guys have any questions about this patch?

Thank you,

Suravee

On 6/3/2014 12:58 PM, Tejun Heo wrote:
> 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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>


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