linux-kernel - Re: [PATCH] SATA: OCTEON: support SATA on OCTEON platform

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Date:	Mon, 19 Jan 2015 21:46:52 +0100
From:	Arnd Bergmann <arnd@...db.de>
To:	Rob Herring <robherring2@...il.com>
Cc:	David Daney <ddaney.cavm@...il.com>,
	Mark Rutland <mark.rutland@....com>,
	Aleksey Makarov <aleksey.makarov@...iga.com>,
	"linux-ide@...r.kernel.org" <linux-ide@...r.kernel.org>,
	"linux-mips@...ux-mips.org" <linux-mips@...ux-mips.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	David Daney <david.daney@...ium.com>,
	Anton Vorontsov <avorontsov@...mvista.com>,
	Vinita Gupta <vgupta@...iumnetworks.com>,
	Rob Herring <robh+dt@...nel.org>,
	Pawel Moll <Pawel.Moll@....com>,
	Ian Campbell <ijc+devicetree@...lion.org.uk>,
	Kumar Gala <galak@...eaurora.org>,
	Ralf Baechle <ralf@...ux-mips.org>, Tejun Heo <tj@...nel.org>,
	Hans de Goede <hdegoede@...hat.com>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>
Subject: Re: [PATCH] SATA: OCTEON: support SATA on OCTEON platform

On Monday 19 January 2015 14:30:22 Rob Herring wrote:
> On Mon, Jan 19, 2015 at 1:16 PM, David Daney <ddaney.cavm@...il.com> wrote:
> > On 01/19/2015 07:43 AM, Mark Rutland wrote:
> >>
> >> On Mon, Jan 19, 2015 at 03:23:58PM +0000, Aleksey Makarov wrote:
> >>>
> >>> The OCTEON SATA controller is currently found on cn71XX devices.
> 
> [...]
> 
> >>> +
> >>> +       /* Set a good dma_mask */
> >>> +       pdev->dev.coherent_dma_mask = DMA_BIT_MASK(64);
> >>> +       pdev->dev.dma_mask = &pdev->dev.coherent_dma_mask;
> >>
> >>
> >> I thought a dma-ranges property in the DT could be used to set up the
> >> DMA mask appropriately?
> >
> >
> > The DT contains no dma-ranges property, and we know a priori, that it should
> > be 64-bits.
> 
> Neither this code nor dma-ranges should be necessary. The AHCI core
> code will set the mask to 32 or 64 bits based on the AHCI Capabilities
> register.

You should however have a dma-ranges property in the parent bus of the
device that contains the allowed range for DMA. The current dma_set_mask
function is broken and will accept whatever a device driver asks for,
and we need to fix this so masks larger than what is specified in dma-ranges
are rejected.

	Arnd
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