diff options
| author | Vidya Sagar <vidyas@nvidia.com> | 2020-11-17 22:23:12 +0530 |
|---|---|---|
| committer | Lorenzo Pieralisi <lorenzo.pieralisi@arm.com> | 2020-12-10 11:47:26 +0000 |
| commit | 660c486590aa4190969653218643b3a4e5660f2b (patch) | |
| tree | 918d9903b315a38a93c1358dad19b51b1870cb0a /drivers/pci | |
| parent | 4c9398822106c366d88c8c68ddf44bd371d39961 (diff) | |
| download | linux-660c486590aa4190969653218643b3a4e5660f2b.tar.bz2 | |
PCI: dwc: Set 32-bit DMA mask for MSI target address allocation
Set DMA mask to 32-bit while allocating the MSI target address so that
the address is usable for both 32-bit and 64-bit MSI capable devices.
Throw a warning if it fails to set the mask to 32-bit to alert that
devices that are only 32-bit MSI capable may not work properly.
Link: https://lore.kernel.org/r/20201117165312.25847-1-vidyas@nvidia.com
Signed-off-by: Vidya Sagar <vidyas@nvidia.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Robin Murphy <robin.murphy@arm.com>
Diffstat (limited to 'drivers/pci')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware-host.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index 99ef808a40a9..516b151e0ef3 100644 --- a/drivers/pci/controller/dwc/pcie-designware-host.c +++ b/drivers/pci/controller/dwc/pcie-designware-host.c @@ -396,6 +396,14 @@ int dw_pcie_host_init(struct pcie_port *pp) dw_chained_msi_isr, pp); + ret = dma_set_mask(pci->dev, DMA_BIT_MASK(32)); + if (!ret) { + dev_warn(pci->dev, + "Failed to set DMA mask to 32-bit. " + "Devices with only 32-bit MSI support" + " may not work properly\n"); + } + pp->msi_data = dma_map_single_attrs(pci->dev, &pp->msi_msg, sizeof(pp->msi_msg), DMA_FROM_DEVICE, |