Hi Greg,
b25f3e1c358434bf850220e04f28eebfc45eb634
ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling
This patch looks applicable to stable-3.10, which flush outer cache before
soft_restart(). Without this patch, kexec on omap4 always fail.
I have tested this patch on PandaBoard-ES (omap4460).
Thanks!
Wang Nan
--------------------------------------
>From b25f3e1c358434bf850220e04f28eebfc45eb634 Mon Sep 17 00:00:00 2001
From: Taras Kondratiuk <taras.kondratiuk@xxxxxxxxxx>
Date: Fri, 10 Jan 2014 01:27:08 +0100
Subject: [PATCH] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling
commit b25f3e1c358434bf850220e04f28eebfc45eb634 upstream
Kexec disables outer cache before jumping to reboot code, but it doesn't
flush it explicitly. Flush is done implicitly inside of l2x0_disable().
But some SoC's override default .disable handler and don't flush cache.
This may lead to a corrupted memory during Kexec reboot on these
platforms.
This patch adds cache flush inside of OMAP4 and Highbank outer_cache.disable()
handlers to make it consistent with default l2x0_disable().
Acked-by: Rob Herring <rob.herring@xxxxxxxxxxx>
Acked-by: Santosh Shilimkar <santosh.shilimkar@xxxxxx>
Acked-by: Tony Lindgren <tony@xxxxxxxxxxx>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@xxxxxxxxxx>
Signed-off-by: Russell King <rmk+kernel@xxxxxxxxxxxxxxxx>
---
arch/arm/mach-highbank/highbank.c | 1 +
arch/arm/mach-omap2/omap4-common.c | 1 +
2 files changed, 2 insertions(+)
diff --git a/arch/arm/mach-highbank/highbank.c b/arch/arm/mach-highbank/highbank.c
index b3d7e56..ae17150 100644
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -50,6 +50,7 @@ static void __init highbank_scu_map_io(void)
static void highbank_l2x0_disable(void)
{
+ outer_flush_all();
/* Disable PL310 L2 Cache controller */
highbank_smc1(0x102, 0x0);
}
diff --git a/arch/arm/mach-omap2/omap4-common.c b/arch/arm/mach-omap2/omap4-common.c
index 5791143..3f44b16 100644
--- a/arch/arm/mach-omap2/omap4-common.c
+++ b/arch/arm/mach-omap2/omap4-common.c
@@ -163,6 +163,7 @@ void __iomem *omap4_get_l2cache_base(void)
static void omap4_l2x0_disable(void)
{
+ outer_flush_all();
/* Disable PL310 L2 Cache controller */
omap_smc1(0x102, 0x0);
}
--
1.8.4
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