PCI: rcar: Fix calculating mask for PCIEPAMR register

The mask value was calculated incorrectly for PCIEPAMR register if the
size was less than 128 bytes. Fix this issue by adding a check on size.

Link: https://lore.kernel.org/r/1588854799-13710-4-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com
Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@bp.renesas.com>
Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>

diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
index cf8840d180c347c23a1c027038bfcd83e41e49cf..7583699ef7b6a8be646b6ffaaee96da50946d9c5 100644 (file)
--- a/drivers/pci/controller/pcie-rcar.c
+++ b/drivers/pci/controller/pcie-rcar.c
@@ -76,7 +76,10 @@ void rcar_pcie_set_outbound(struct rcar_pcie *pcie, int win,
         * keeps things pretty simple.
         */
        size = resource_size(res);
-       mask = (roundup_pow_of_two(size) / SZ_128) - 1;
+       if (size > 128)
+               mask = (roundup_pow_of_two(size) / SZ_128) - 1;
+       else
+               mask = 0x0;
        rcar_pci_write_reg(pcie, mask << 7, PCIEPAMR(win));
 
        if (res->flags & IORESOURCE_IO)