[PATCH 2/2] rcar-pcie: set host bridge's DMA mask

Nikita Yushchenko
2016-12-29T20:45:04Z

This gives platform DMA mapping code a chance to disallow setting device
DMA mask to something that host bridge can't support.

Signed-off-by: Nikita Yushchenko <nikita.yoush@cogentembedded.com>
---
drivers/pci/host/pcie-rcar.c | 5 +++++
1 file changed, 5 insertions(+)

diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c
index aca85be..b1edc3c 100644
--- a/drivers/pci/host/pcie-rcar.c
+++ b/drivers/pci/host/pcie-rcar.c
@@ -451,6 +451,7 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie)
{
struct device *dev = pcie->dev;
struct pci_bus *bus, *child;
+ struct pci_host_bridge *bridge;
LIST_HEAD(res);

/* Try setting 5 GT/s link speed */
@@ -480,6 +481,10 @@ static int rcar_pcie_enable(struct rcar_pcie *pcie)
list_for_each_entry(child, &bus->children, node)
pcie_bus_configure_settings(child);

+ bridge = pci_find_host_bridge(bus);
+ bridge->dev.coherent_dma_mask = DMA_BIT_MASK(32);
+ bridge->dev.dma_mask = &bridge->dev.coherent_dma_mask;
+
pci_bus_add_devices(bus);

return 0;
--
2.1.4