releases/4.0.8/arm-mvebu-fix-suspend-to-ram-on-big-endian-configurations.patch

   1 From 2f5bc307be2480ba89e4c5d118f406f04a4a7299 Mon Sep 17 00:00:00 2001
   2 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   3 Date: Tue, 16 Jun 2015 14:12:57 +0200
   4 Subject: ARM: mvebu: fix suspend to RAM on big-endian configurations
   5
   6 From: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
   7
   8 commit 2f5bc307be2480ba89e4c5d118f406f04a4a7299 upstream.
   9
  10 The current Armada XP suspend to RAM implementation, as added in
  11 commit 27432825ae19f ("ARM: mvebu: Armada XP GP specific
  12 suspend/resume code") does not handle big-endian configurations
  13 properly: the small bit of assembly code putting the DRAM in
  14 self-refresh and toggling the GPIOs to turn off power forgets to
  15 convert the values to little-endian.
  16
  17 This commit fixes that by making sure the two values we will write to
  18 the DRAM controller register and GPIO register are already in
  19 little-endian before entering the critical assembly code.
  20
  21 Signed-off-by: Thomas Petazzoni <thomas.petazzoni@free-electrons.com>
  22 Fixes: 27432825ae19f ("ARM: mvebu: Armada XP GP specific suspend/resume code")
  23 Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
  24
  25 ---
  26  arch/arm/mach-mvebu/pm-board.c |    3 +++
  27  1 file changed, 3 insertions(+)
  28
  29 --- a/arch/arm/mach-mvebu/pm-board.c
  30 +++ b/arch/arm/mach-mvebu/pm-board.c
  31 @@ -43,6 +43,9 @@ static void mvebu_armada_xp_gp_pm_enter(
  32         for (i = 0; i < ARMADA_XP_GP_PIC_NR_GPIOS; i++)
  33                 ackcmd |= BIT(pic_raw_gpios[i]);
  34
  35 +       srcmd = cpu_to_le32(srcmd);
  36 +       ackcmd = cpu_to_le32(ackcmd);
  37 +
  38         /*
  39          * Wait a while, the PIC needs quite a bit of time between the
  40          * two GPIO commands.