[PATCH 2/5] switchtec: Set DMA coherent mask in Switchtec driver

Wesley Sheng
2018-12-10T02:44:36Z

From: Boris Glimcher <Boris.Glimcher@emc.com>

Switchtec hardware supports 64-bit DMA, set the correct DMA mask.
This allows the CMA to allocate larger buffers for memory windows.

Signed-off-by: Boris Glimcher <Boris.Glimcher@emc.com>
Signed-off-by: Wesley Sheng <wesley.sheng@microchip.com>
Reviewed-by: Logan Gunthorpe <logang@deltatee.com>
---
drivers/pci/switch/switchtec.c | 4 ++++
1 file changed, 4 insertions(+)

diff --git a/drivers/pci/switch/switchtec.c b/drivers/pci/switch/switchtec.c
index d2bca2d..480107e 100644
--- a/drivers/pci/switch/switchtec.c
+++ b/drivers/pci/switch/switchtec.c
@@ -1237,6 +1237,10 @@ static int switchtec_init_pci(struct switchtec_dev *stdev,
if (rc)
return rc;

+ rc = dma_set_coherent_mask(&pdev->dev, DMA_BIT_MASK(64));
+ if (rc)
+ return rc;
+
pci_set_master(pdev);

stdev->mmio = pcim_iomap_table(pdev)[0];
--
2.7.4