On 01/23/2015 06:27 PM, Bjorn Helgaas wrote:
On Fri, Jan 23, 2015 at 05:32:38PM -0500, Murali Karicheri wrote:
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. Also support using
the DT property dma-coherent to allow coherent DMA operation by the
PCI device.
This patch use the new helper function of_pci_dma_configure() to update
the device dma configuration.
Cc: Joerg Roedel<joro@xxxxxxxxxx>
Cc: Grant Likely<grant.likely@xxxxxxxxxx>
Cc: Rob Herring<robh+dt@xxxxxxxxxx>
Cc: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
Cc: Will Deacon<will.deacon@xxxxxxx>
Cc: Russell King<linux@xxxxxxxxxxxxxxxx>
Cc: Arnd Bergmann<arnd@xxxxxxxx>
Cc: Suravee Suthikulpanit<Suravee.Suthikulpanit@xxxxxxx>
Signed-off-by: Murali Karicheri<m-karicheri2@xxxxxx>
I assume this series will be merged via some non-PCI tree, so:
Not sure who will pick this. Since this is for PCI, will it be possible
to apply this to arm-pci/next?
Acked-by: Bjorn Helgaas<bhelgaas@xxxxxxxxxx>
I will add your ack for v5.
Murali
---
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
--
Murali Karicheri
Linux Kernel, Texas Instruments
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