linux-kernel - [PATCH 3.19.y-ckt 133/251] ARM: mvebu: fix suspend to RAM on big-endian configurations

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Message-Id: <1437008972-9140-134-git-send-email-kamal@canonical.com>
Date:	Wed, 15 Jul 2015 18:07:34 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 3.19.y-ckt 133/251] ARM: mvebu: fix suspend to RAM on big-endian configurations

3.19.8-ckt4 -stable review patch.  If anyone has any objections, please let me know.

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

From: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>

commit 2f5bc307be2480ba89e4c5d118f406f04a4a7299 upstream.

The current Armada XP suspend to RAM implementation, as added in
commit 27432825ae19f ("ARM: mvebu: Armada XP GP specific
suspend/resume code") does not handle big-endian configurations
properly: the small bit of assembly code putting the DRAM in
self-refresh and toggling the GPIOs to turn off power forgets to
convert the values to little-endian.

This commit fixes that by making sure the two values we will write to
the DRAM controller register and GPIO register are already in
little-endian before entering the critical assembly code.

Signed-off-by: Thomas Petazzoni <thomas.petazzoni@...e-electrons.com>
Fixes: 27432825ae19f ("ARM: mvebu: Armada XP GP specific suspend/resume code")
Signed-off-by: Kamal Mostafa <kamal@...onical.com>
---
 arch/arm/mach-mvebu/pm-board.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/arm/mach-mvebu/pm-board.c b/arch/arm/mach-mvebu/pm-board.c
index 6dfd4ab..301ab38 100644
--- a/arch/arm/mach-mvebu/pm-board.c
+++ b/arch/arm/mach-mvebu/pm-board.c
@@ -43,6 +43,9 @@ static void mvebu_armada_xp_gp_pm_enter(void __iomem *sdram_reg, u32 srcmd)
 	for (i = 0; i < ARMADA_XP_GP_PIC_NR_GPIOS; i++)
 		ackcmd |= BIT(pic_raw_gpios[i]);
 
+	srcmd = cpu_to_le32(srcmd);
+	ackcmd = cpu_to_le32(ackcmd);
+
 	/*
 	 * Wait a while, the PIC needs quite a bit of time between the
 	 * two GPIO commands.
-- 
1.9.1

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