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[v2,19/22] PCI: tegra: update PCI config space remap function

Message ID 20170327094954.7162-20-lorenzo.pieralisi@arm.com (mailing list archive)
State New, archived
Delegated to: Bjorn Helgaas
Headers show

Commit Message

Lorenzo Pieralisi March 27, 2017, 9:49 a.m. UTC 
PCI configuration space should be mapped with a memory region type that
generates on the CPU host bus non-posted write transations. Update the
driver to use correct memory mapping attributes to map config space
regions to enforce configuration space non-posted writes behaviour.

Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Cc: Bjorn Helgaas <bhelgaas@google.com>
Cc: Thierry Reding <thierry.reding@gmail.com>
---
 drivers/pci/host/pci-tegra.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
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Patch

diff --git a/drivers/pci/host/pci-tegra.c b/drivers/pci/host/pci-tegra.c
index ed8a93f..ec72c3a 100644
--- a/drivers/pci/host/pci-tegra.c
+++ b/drivers/pci/host/pci-tegra.c
@@ -380,7 +380,7 @@  static struct tegra_pcie_bus *tegra_pcie_bus_alloc(struct tegra_pcie *pcie,
 						   unsigned int busnr)
 {
 	struct device *dev = pcie->dev;
-	pgprot_t prot = pgprot_device(PAGE_KERNEL);
+	pgprot_t prot = pgprot_nonposted(PAGE_KERNEL);
 	phys_addr_t cs = pcie->cs->start;
 	struct tegra_pcie_bus *bus;
 	unsigned int i;
@@ -1962,7 +1962,7 @@  static int tegra_pcie_parse_dt(struct tegra_pcie *pcie)
 		rp->pcie = pcie;
 		rp->np = port;
 
-		rp->base = devm_ioremap_resource(dev, &rp->regs);
+		rp->base = devm_ioremap_nopost_resource(dev, &rp->regs);
 		if (IS_ERR(rp->base))
 			return PTR_ERR(rp->base);