From: Vaibhav Hiremath <hvaibhav@ti.com>
Date: Mon, 5 Mar 2012 05:23:00 +0000 (+0530)
Subject: ARM: TIME: Enable sys_timer suspend/resume callback api's
X-Git-Url: https://git.ti.com/gitweb?p=sitara-epos%2Fsitara-epos-kernel.git;a=commitdiff_plain;h=ae265fa78e8d242f2199505c68ebd10e355cbf43

ARM: TIME: Enable sys_timer suspend/resume callback api's

In case of AM335x, we do not 32k_counter available, which
is actually being used as source timer in OMAP family of devices.
AM335x has 8 timer modules, 2 timer modules are in wakeup/always-on
domain, and out of these 2, 1 timer is secure timer; which leaves
SW to use only 1 timer which can run in off/suspend state. And
we need 2 timers, one for clockevent and another for clocksource.

The suspend/resume callbacks are available on sys_timer and
clocksource, but due to unknown reason clocksource callbacks are
not working. TODO: WE MUST DEBUG FURTHER ON THIS.

The sys_timer suspend/resume callback api's are supressed
under config option !defined(CONFIG_GENERIC_CLOCKEVENTS),
enable it, required for AM335x suspend/resume funtionality.
Not sure, why it is not enabled and appliable to ARM arch, will
have to follow up it with community.

Signed-off-by: Vaibhav Hiremath <hvaibhav@ti.com>
---

diff --git a/arch/arm/kernel/time.c b/arch/arm/kernel/time.c
index 8c57dd3680e9..3abe5da9962b 100644
--- a/arch/arm/kernel/time.c
+++ b/arch/arm/kernel/time.c
@@ -112,7 +112,7 @@ void timer_tick(void)
 }
 #endif
 
-#if defined(CONFIG_PM) && !defined(CONFIG_GENERIC_CLOCKEVENTS)
+#if defined(CONFIG_PM)
 static int timer_suspend(void)
 {
 	if (system_timer->suspend)