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PCI: dwc: Set 32-bit DMA mask for MSI target address allocation

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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>
This commit is contained in:
Vidya Sagar 2020-11-17 22:23:12 +05:30 committed by Lorenzo Pieralisi
parent 4c93988221
commit 660c486590
1 changed files with 8 additions and 0 deletions
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8
drivers/pci/controller/dwc/pcie-designware-host.c
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@ -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,