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 07:45:12 -0500
From:	Suravee Suthikulanit <suravee.suthikulpanit@....com>
To:	Sergei Shtylyov <sergei.shtylyov@...entembedded.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

On 6/12/2014 12:47 PM, Sergei Shtylyov wrote:
>> 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?
Actually, I intended to say 64 since this is supposed to be setting up 
64-bit DMA mask. Or we could just say failed to set up DMA mask.

Suravee

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