From: Andrew Murray <andrew.murray@xxxxxxx> [ Upstream commit 2b9f217433e31d125fb697ca7974d3de3ecc3e92 ] The outbound windows (PCIEPAUR(x), PCIEPALR(x)) describe a mapping between a CPU address (which is determined by the window number 'x') and a programmed PCI address - Thus allowing the controller to translate CPU accesses into PCI accesses. However the existing code incorrectly writes the CPU address - lets fix this by writing the PCI address instead. For memory transactions, existing DT users describe a 1:1 identity mapping and thus this change should have no effect. However the same isn't true for I/O. Link: https://lore.kernel.org/r/20191004132941.6660-1-andrew.murray@xxxxxxx Fixes: c25da4778803 ("PCI: rcar: Add Renesas R-Car PCIe driver") Tested-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxx> Signed-off-by: Andrew Murray <andrew.murray@xxxxxxx> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@xxxxxxx> Reviewed-by: Marek Vasut <marek.vasut+renesas@xxxxxxxxx> Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx> --- drivers/pci/host/pcie-rcar.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff --git a/drivers/pci/host/pcie-rcar.c b/drivers/pci/host/pcie-rcar.c index 2b0a1f3b8265..0077afca2493 100644 --- a/drivers/pci/host/pcie-rcar.c +++ b/drivers/pci/host/pcie-rcar.c @@ -328,11 +328,12 @@ static struct pci_ops rcar_pcie_ops = { }; static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie, - struct resource *res) + struct resource_entry *window) { /* Setup PCIe address space mappings for each resource */ resource_size_t size; resource_size_t res_start; + struct resource *res = window->res; u32 mask; rcar_pci_write_reg(pcie, 0x00000000, PCIEPTCTLR(win)); @@ -346,9 +347,9 @@ static void rcar_pcie_setup_window(int win, struct rcar_pcie *pcie, rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win)); if (res->flags & IORESOURCE_IO) - res_start = pci_pio_to_address(res->start); + res_start = pci_pio_to_address(res->start) - window->offset; else - res_start = res->start; + res_start = res->start - window->offset; rcar_pci_write_reg(pcie, upper_32_bits(res_start), PCIEPAUR(win)); rcar_pci_write_reg(pcie, lower_32_bits(res_start) & ~0x7F, @@ -377,7 +378,7 @@ static int rcar_pcie_setup(struct list_head *resource, struct rcar_pcie *pci) switch (resource_type(res)) { case IORESOURCE_IO: case IORESOURCE_MEM: - rcar_pcie_setup_window(i, pci, res); + rcar_pcie_setup_window(i, pci, win); i++; break; case IORESOURCE_BUS: -- 2.25.1
