From mboxrd@z Thu Jan 1 00:00:00 1970 From: robherring2@gmail.com (Rob Herring) Date: Sun, 21 Jul 2013 14:53:37 -0500 Subject: [PATCH] ARM: highbank: Only touch common coherency control register fields Message-ID: <1374436417-29761-1-git-send-email-robherring2@gmail.com> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org From: Rob Herring Midway adds new register fields to the coherency control registers, so writing absolute values will break on Midway. Change the register accesses to only modify the necessary and common fields in order to support both Midway and Highbank. Signed-off-by: Rob Herring --- arch/arm/mach-highbank/highbank.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c index dc5d6be..8881579 100644 --- a/arch/arm/mach-highbank/highbank.c +++ b/arch/arm/mach-highbank/highbank.c @@ -115,6 +115,7 @@ static int highbank_platform_notifier(struct notifier_block *nb, { struct resource *res; int reg = -1; + u32 val; struct device *dev = __dev; if (event != BUS_NOTIFY_ADD_DEVICE) @@ -141,10 +142,10 @@ static int highbank_platform_notifier(struct notifier_block *nb, return NOTIFY_DONE; if (of_property_read_bool(dev->of_node, "dma-coherent")) { - writel(0xff31, sregs_base + reg); + val = readl(sregs_base + reg); + writel(val | 0xff01, sregs_base + reg); set_dma_ops(dev, &arm_coherent_dma_ops); - } else - writel(0, sregs_base + reg); + } return NOTIFY_OK; } -- 1.8.1.2