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Date: Thu, 20 Mar 2014 11:31:07 -0600
From: Jason Gunthorpe <jgunthorpe@obsidianresearch.com>
To: Ben Dooks <ben.dooks@codethink.co.uk>
Cc: Arnd Bergmann <arnd@arndb.de>,
	Russell King <linux@arm.linux.org.uk>,
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	"linux-pci@vger.kernel.org" <linux-pci@vger.kernel.org>,
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	Magnus Damm <damm@opensource.se>,
	Ben Dooks <ben-linux@fluff.org>,
	Bjorn Helgaas <bhelgaas@google.com>,
	Simon Horman <horms+renesas@verge.net.au>,
	linux-arm-kernel@lists.infradead.org
Subject: Re: DMABOUNCE in pci-rcar
Message-ID: <20140320173106.GA19395@obsidianresearch.com>
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On Thu, Mar 20, 2014 at 06:25:25PM +0100, Ben Dooks wrote:
> So doing:
> 
> static void pci_rcar_fixup(struct pci_dev *dev)
> {
> 	if (dev->bus->ops == &rcar_pci_ops) {
> 		dev_info(&dev->dev, "applying new dma mask\n");
> 		dev->dma_mask = DMA_BIT_MASK(31);
> 	}
> }
> 
> DECLARE_PCI_FIXUP_EARLY(PCI_ANY_ID, PCI_ANY_ID, pci_rcar_fixup);
> 
> Did not work for me :(

Seems like it should work, do you have CONFIG_PCI_QUIRKS turned on?

Jason