From: shawn.guo@linaro.org (Shawn Guo)
To: linux-arm-kernel@lists.infradead.org
Subject: [PATCH] ARM: imx: reset core along with enable/disable operation
Date: Wed, 9 Oct 2013 16:04:03 +0800 [thread overview]
Message-ID: <1381305843-26478-1-git-send-email-shawn.guo@linaro.org> (raw)
>From hotplug stress test result, resetting core during enable/disable
operation can improve cpu hotplug stability. So let's set
SRC reset bit in imx_enable_cpu() for the core when its enable bit is
accessed.
Signed-off-by: Shawn Guo <shawn.guo@linaro.org>
---
arch/arm/mach-imx/src.c | 1 +
1 file changed, 1 insertion(+)
diff --git a/arch/arm/mach-imx/src.c b/arch/arm/mach-imx/src.c
index 10a6b1a..4754373 100644
--- a/arch/arm/mach-imx/src.c
+++ b/arch/arm/mach-imx/src.c
@@ -91,6 +91,7 @@ void imx_enable_cpu(int cpu, bool enable)
spin_lock(&scr_lock);
val = readl_relaxed(src_base + SRC_SCR);
val = enable ? val | mask : val & ~mask;
+ val |= 1 << (BP_SRC_SCR_CORE1_RST + cpu - 1);
writel_relaxed(val, src_base + SRC_SCR);
spin_unlock(&scr_lock);
}
--
1.7.9.5
reply other threads:[~2013-10-09 8:04 UTC|newest]
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