linux-kernel - Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA fails

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Date:	Tue, 10 Nov 2015 15:59:18 -0600
From:	Timur Tabi <timur@...eaurora.org>
To:	Arnd Bergmann <arnd@...db.de>
Cc:	Sinan Kaya <okaya@...eaurora.org>,
	linux-arm-kernel@...ts.infradead.org,
	Abhijit Mahajan <abhijit.mahajan@...gotech.com>,
	Nagalakshmi Nandigama <nagalakshmi.nandigama@...gotech.com>,
	linux-scsi@...r.kernel.org, jcm@...hat.com,
	"James E.J. Bottomley" <JBottomley@...n.com>,
	linux-kernel@...r.kernel.org,
	Sreekanth Reddy <sreekanth.reddy@...gotech.com>,
	Praveen Krishnamoorthy <praveen.krishnamoorthy@...gotech.com>,
	cov@...eaurora.org, linux-arm-msm@...r.kernel.org,
	agross@...eaurora.org, MPT-FusionLinux.pdl@...gotech.com,
	Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH V2 1/3] scsi: mptxsas: try 64 bit DMA when 32 bit DMA
 fails

On 11/10/2015 03:54 PM, Arnd Bergmann wrote:

>> In our drivers for 32-bit devices, we have to explicitly set the DMA
>> mask to 32-bits in order to get any DMA working.
>
> Do you mean PCI devices or platform devices?

Platform.

> Maybe the parent bus is lacking a dma-ranges property?

All of this applies only on device-tree platforms.  Sinan and I are 
working on an ACPI server platform.  So we never call 
of_dma_configure(), and we don't have a dma-ranges property.

-- 
Qualcomm Innovation Center, Inc.
The Qualcomm Innovation Center, Inc. is a member of the
Code Aurora Forum, a Linux Foundation Collaborative Project.
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