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ARM: imx: add timer stop flag to ARM power off state 

When the CPU is in ARM power off state the ARM architected
timers are stopped. The flag is already present in the higher
power WAIT mode.

This allows to use the ARM generic timer on i.MX 6UL/6ULL SoC.
Without the flag the kernel freezes when the timer enters the
first time ARM power off mode.

Note: The default timer on i.MX6SX is the i.MX GPT timer which is
not disabled during CPU idle. However, the timer is not affected
by the CPUIDLE_FLAG_TIMER_STOP flag. The flag only affects CPU
local timers.

Cc: Anson Huang <anson.huang@nxp.com>
Signed-off-by: Stefan Agner <stefan@agner.ch>
Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Shawn Guo <shawnguo@kernel.org>
This commit is contained in:
Stefan Agner 2018-01-10 22:04:47 +01:00 committed by Shawn Guo
parent 1f9d1311a3
commit 49a1a99c53
1 changed files with 1 additions and 0 deletions
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1
arch/arm/mach-imx/cpuidle-imx6sx.c
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@ -89,6 +89,7 @@ static struct cpuidle_driver imx6sx_cpuidle_driver = {
*/ */
.exit_latency = 300, .exit_latency = 300,
.target_residency = 500, .target_residency = 500,
.flags = CPUIDLE_FLAG_TIMER_STOP,
.enter = imx6sx_enter_wait, .enter = imx6sx_enter_wait,
.name = "LOW-POWER-IDLE", .name = "LOW-POWER-IDLE",
.desc = "ARM power off", .desc = "ARM power off",