linux-kernel - [PATCH v7 3/8] PCI: rcar: Fix calculating mask for PCIEPAMR register

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Message-Id: <1586360280-10956-4-git-send-email-prabhakar.mahadev-lad.rj@bp.renesas.com>
Date:   Wed,  8 Apr 2020 16:37:55 +0100
From:   Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
To:     Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Andrew Murray <amurray@...goodpenguin.co.uk>,
        Kishon Vijay Abraham I <kishon@...com>,
        Marek Vasut <marek.vasut+renesas@...il.com>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Jingoo Han <jingoohan1@...il.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Tom Joseph <tjoseph@...ence.com>,
        Heiko Stuebner <heiko@...ech.de>
Cc:     Geert Uytterhoeven <geert+renesas@...der.be>,
        linux-pci@...r.kernel.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org,
        Chris Paterson <Chris.Paterson2@...esas.com>,
        linux-rockchip@...ts.infradead.org,
        Lad Prabhakar <prabhakar.csengg@...il.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Subject: [PATCH v7 3/8] 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.

Signed-off-by: Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@...esas.com>
---
 drivers/pci/controller/pcie-rcar.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/pcie-rcar.c b/drivers/pci/controller/pcie-rcar.c
index b82f200985ec..b46c69ac62f2 100644
--- a/drivers/pci/controller/pcie-rcar.c
+++ b/drivers/pci/controller/pcie-rcar.c
@@ -75,7 +75,10 @@ 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)
-- 
2.20.1