From: Marek Vasut <[email protected]> [ Upstream commit c4e0fec2f7ee013dbf86445394ff47f719408f99 ]
This fixes MSI operation on legacy PCI cards, which cannot issue 64bit MSIs. The R-Car controller only has one MSI trigger address instead of two, one for 64bit and one for 32bit MSI, set the address to 32bit PCIe space so that legacy PCI cards can also trigger MSIs. Link: https://lore.kernel.org/r/[email protected] Fixes: 290c1fb35860 ("PCI: rcar: Add MSI support for PCIe") Tested-by: Yoshihiro Shimoda <[email protected]> Tested-by: Geert Uytterhoeven <[email protected]> Signed-off-by: Marek Vasut <[email protected]> Signed-off-by: Lorenzo Pieralisi <[email protected]> Reviewed-by: Yoshihiro Shimoda <[email protected]> Reviewed-by: Geert Uytterhoeven <[email protected]> Cc: Bjorn Helgaas <[email protected]> Cc: Geert Uytterhoeven <[email protected]> Cc: Lorenzo Pieralisi <[email protected]> Cc: Wolfram Sang <[email protected]> Cc: Yoshihiro Shimoda <[email protected]> Cc: [email protected] Signed-off-by: Sasha Levin <[email protected]> --- drivers/pci/controller/pcie-rcar-host.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/pci/controller/pcie-rcar-host.c b/drivers/pci/controller/pcie-rcar-host.c index 4d1c4b24e5370..a728e8f9ad3c8 100644 --- a/drivers/pci/controller/pcie-rcar-host.c +++ b/drivers/pci/controller/pcie-rcar-host.c @@ -735,7 +735,7 @@ static int rcar_pcie_enable_msi(struct rcar_pcie_host *host) } /* setup MSI data target */ - msi->pages = __get_free_pages(GFP_KERNEL, 0); + msi->pages = __get_free_pages(GFP_KERNEL | GFP_DMA32, 0); rcar_pcie_hw_enable_msi(host); return 0; -- 2.27.0
