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PCI: endpoint: Use of_dma_configure() to set initial DMA mask 

Use of_dma_configure() to set the initial DMA mask of EPF device. This
helps to get rid of "Coherent DMA mask 0x0 (pfn 0x0-0x1) covers a smaller
range of system memory than the DMA zone pfn" warning in certain platforms
like TI's K2G resulting in coherent DMA mask not being set.

Signed-off-by: Kishon Vijay Abraham I <kishon@ti.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Kishon Vijay Abraham I 2017-08-18 20:27:53 +05:30 committed by Bjorn Helgaas
parent 16f73eb02d
commit 64c1a02aec
1 changed files with 9 additions and 2 deletions
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11
drivers/pci/endpoint/pci-epc-core.c
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@ -21,6 +21,7 @@
#include <linux/dma-mapping.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/of_device.h>
#include <linux/pci-epc.h>
#include <linux/pci-epf.h>
@ -370,6 +371,7 @@ EXPORT_SYMBOL_GPL(pci_epc_write_header);
int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
{
unsigned long flags;
struct device *dev = epc->dev.parent;
if (epf->epc)
return -EBUSY;
@ -381,8 +383,12 @@ int pci_epc_add_epf(struct pci_epc *epc, struct pci_epf *epf)
return -EINVAL;
epf->epc = epc;
dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask);
epf->dev.dma_mask = epc->dev.dma_mask;
if (dev->of_node) {
of_dma_configure(&epf->dev, dev->of_node);
} else {
dma_set_coherent_mask(&epf->dev, epc->dev.coherent_dma_mask);
epf->dev.dma_mask = epc->dev.dma_mask;
}
spin_lock_irqsave(&epc->lock, flags);
list_add_tail(&epf->list, &epc->pci_epf);
@ -500,6 +506,7 @@ __pci_epc_create(struct device *dev, const struct pci_epc_ops *ops,
dma_set_coherent_mask(&epc->dev, dev->coherent_dma_mask);
epc->dev.class = pci_epc_class;
epc->dev.dma_mask = dev->dma_mask;
epc->dev.parent = dev;
epc->ops = ops;
ret = dev_set_name(&epc->dev, "%s", dev_name(dev));