linux-kernel - [PATCH 3.13.y-ckt 054/143] ARM: 8284/1: sa1100: clear RCSR

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Message-Id: <1427831308-1854-55-git-send-email-kamal@canonical.com>
Date:	Tue, 31 Mar 2015 12:46:59 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Dmitry Eremin-Solenikov <dbaryshkov@...il.com>,
	Russell King <rmk+kernel@....linux.org.uk>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.13.y-ckt 054/143] ARM: 8284/1: sa1100: clear RCSR_SMR on resume

3.13.11-ckt18 -stable review patch.  If anyone has any objections, please let me know.

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

From: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>

commit e461894dc2ce7778ccde1c3483c9b15a85a7fc5f upstream.

StrongARM core uses RCSR SMR bit to tell to bootloader that it was reset
by entering the sleep mode. After we have resumed, there is little point
in having that bit enabled. Moreover, if this bit is set before reboot,
the bootloader can become confused. Thus clear the SMR bit on resume
just before clearing the scratchpad (resume address) register.

Signed-off-by: Dmitry Eremin-Solenikov <dbaryshkov@...il.com>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/mach-sa1100/pm.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/arm/mach-sa1100/pm.c b/arch/arm/mach-sa1100/pm.c
index 6645d1e..34853d5 100644
--- a/arch/arm/mach-sa1100/pm.c
+++ b/arch/arm/mach-sa1100/pm.c
@@ -81,6 +81,7 @@ static int sa11x0_pm_enter(suspend_state_t state)
 	/*
 	 * Ensure not to come back here if it wasn't intended
 	 */
+	RCSR = RCSR_SMR;
 	PSPR = 0;
 
 	/*
-- 
1.9.1

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