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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>
hifive-unleashed-5.1
Shawn Guo 2013-01-14 21:11:10 +08:00
parent 8375766421
commit 83ae20981a
2 changed files with 4 additions and 0 deletions
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3
arch/arm/mach-imx/clk-imx6q.c
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@ -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);

1
arch/arm/mach-imx/pm-imx6q.c
View File

@ -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;