linux-kernel - [RFC v1 PATCH 2/2] PCI: update dma configuration from DT

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Message-ID: <1418940425-2017-3-git-send-email-m-karicheri2@ti.com>
Date:	Thu, 18 Dec 2014 17:07:05 -0500
From:	Murali Karicheri <m-karicheri2@...com>
To:	<bhelgaas@...gle.com>, <linux-pci@...r.kernel.org>,
	<linux-kernel@...r.kernel.org>, <grant.likely@...aro.org>,
	<robh+dt@...nel.org>, <devicetree@...r.kernel.org>,
	<arnd@...db.de>, <linux-arm-kernel@...ts.infradead.org>
CC:	Murali Karicheri <m-karicheri2@...com>
Subject: [RFC v1 PATCH 2/2] PCI: update dma configuration from DT

if there is a DT node available for the root bridge's parent device,
use the dma configuration from that device node. For example, keystone
PCI devices would require dma_pfn_offset to be set correctly in the
device structure of the pci device in order to have the correct dma mask.
The DT node will have dma-ranges defined for this. This also support using
the DT property dma-coherent to allow coherent DMA operation by the
PCI device.

Signed-off-by: Murali Karicheri <m-karicheri2@...com>
---
 drivers/pci/probe.c |    2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/pci/probe.c b/drivers/pci/probe.c
index 23212f8..d7dcd6c 100644
--- a/drivers/pci/probe.c
+++ b/drivers/pci/probe.c
@@ -6,6 +6,7 @@
 #include <linux/delay.h>
 #include <linux/init.h>
 #include <linux/pci.h>
+#include <linux/of_pci.h>
 #include <linux/pci_hotplug.h>
 #include <linux/slab.h>
 #include <linux/module.h>
@@ -1520,6 +1521,7 @@ void pci_device_add(struct pci_dev *dev, struct pci_bus *bus)
 	dev->dev.dma_mask = &dev->dma_mask;
 	dev->dev.dma_parms = &dev->dma_parms;
 	dev->dev.coherent_dma_mask = 0xffffffffull;
+	of_pci_dma_configure(dev);
 
 	pci_set_dma_max_seg_size(dev, 65536);
 	pci_set_dma_seg_boundary(dev, 0xffffffff);
-- 
1.7.9.5

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