[PATCH v3 08/51] cpuidle,imx6: Push RCU-idle into driver
Peter Zijlstra
peterz at infradead.org
Thu Jan 12 11:43:22 PST 2023
Doing RCU-idle outside the driver, only to then temporarily enable it
again, at least twice, before going idle is daft.
Notably both cpu_pm_enter() and cpu_cluster_pm_enter() implicity
re-enable RCU.
Signed-off-by: Peter Zijlstra (Intel) <peterz at infradead.org>
Reviewed-by: Frederic Weisbecker <frederic at kernel.org>
Acked-by: Rafael J. Wysocki <rafael.j.wysocki at intel.com>
Tested-by: Tony Lindgren <tony at atomide.com>
Tested-by: Ulf Hansson <ulf.hansson at linaro.org>
---
arch/arm/mach-imx/cpuidle-imx6sx.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)
--- a/arch/arm/mach-imx/cpuidle-imx6sx.c
+++ b/arch/arm/mach-imx/cpuidle-imx6sx.c
@@ -47,7 +47,9 @@ static int imx6sx_enter_wait(struct cpui
cpu_pm_enter();
cpu_cluster_pm_enter();
+ ct_idle_enter();
cpu_suspend(0, imx6sx_idle_finish);
+ ct_idle_exit();
cpu_cluster_pm_exit();
cpu_pm_exit();
@@ -87,7 +89,8 @@ static struct cpuidle_driver imx6sx_cpui
*/
.exit_latency = 300,
.target_residency = 500,
- .flags = CPUIDLE_FLAG_TIMER_STOP,
+ .flags = CPUIDLE_FLAG_TIMER_STOP |
+ CPUIDLE_FLAG_RCU_IDLE,
.enter = imx6sx_enter_wait,
.name = "LOW-POWER-IDLE",
.desc = "ARM power off",
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