linux-kernel - [PATCH 3.11 042/233] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

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Date:	Fri,  7 Feb 2014 11:44:21 +0000
From:	Luis Henriques <luis.henriques@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Taras Kondratiuk <taras.kondratiuk@...aro.org>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Wang Nan <wangnan0@...wei.com>,
	Luis Henriques <luis.henriques@...onical.com>
Subject: [PATCH 3.11 042/233] ARM: 7938/1: OMAP4/highbank: Flush L2 cache before disabling

3.11.10.4 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Taras Kondratiuk <taras.kondratiuk@...aro.org>

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@...xeda.com>
Acked-by: Santosh Shilimkar <santosh.shilimkar@...com>
Acked-by: Tony Lindgren <tony@...mide.com>
Signed-off-by: Taras Kondratiuk <taras.kondratiuk@...aro.org>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Cc: Wang Nan <wangnan0@...wei.com>
Signed-off-by: Luis Henriques <luis.henriques@...onical.com>
---
 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 d247cf2..4a929a2 100644
--- a/arch/arm/mach-highbank/highbank.c
+++ b/arch/arm/mach-highbank/highbank.c
@@ -71,6 +71,7 @@ void highbank_set_cpu_jump(int cpu, void *jump_addr)
 #ifdef CONFIG_CACHE_L2X0
 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);
 }
-- 
1.8.3.2

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