ARM: imx: correct low-power mode setting

The hardware reset value of bit CCM_CLPCR_LPM enables WAIT mode
(WAIT_UNCLOCKED) by default.  However this is undesirable because
WAIT mode should only be enabled when there is a driver managing
ARM clock gating.  Correct the initial power mode to WAIT_CLOCKED
(disable WAIT mode).  While at it, the power mode after resuming
is also set back to WAIT_CLOCKED from STOP_POWER_OFF.

Signed-off-by: Shawn Guo <shawn.guo@linaro.org>

diff --git a/arch/arm/mach-imx/clk-imx6q.c b/arch/arm/mach-imx/clk-imx6q.c
index 7f2c10c7413abaf0786b45a29933bc60745bd12c..c0c4e723b7f5dee0a34526fd280cab2e8b3966b1 100644 (file)
--- a/arch/arm/mach-imx/clk-imx6q.c
+++ b/arch/arm/mach-imx/clk-imx6q.c
@@ -436,6 +436,9 @@ int __init mx6q_clocks_init(void)
        for (i = 0; i < ARRAY_SIZE(clks_init_on); i++)
                clk_prepare_enable(clk[clks_init_on[i]]);
 
+       /* Set initial power mode */
+       imx6q_set_lpm(WAIT_CLOCKED);
+
        np = of_find_compatible_node(NULL, NULL, "fsl,imx6q-gpt");
        base = of_iomap(np, 0);
        WARN_ON(!base);

diff --git a/arch/arm/mach-imx/pm-imx6q.c b/arch/arm/mach-imx/pm-imx6q.c
index a17543da602da4d8c5504961434bba5bfa2551b2..ee42d20cba19f022d4a9ece8616e27b443d7e82e 100644 (file)
--- a/arch/arm/mach-imx/pm-imx6q.c
+++ b/arch/arm/mach-imx/pm-imx6q.c
@@ -41,6 +41,7 @@ static int imx6q_pm_enter(suspend_state_t state)
                cpu_suspend(0, imx6q_suspend_finish);
                imx_smp_prepare();
                imx_gpc_post_resume();
+               imx6q_set_lpm(WAIT_CLOCKED);
                break;
        default:
                return -EINVAL;