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Message-ID: <1448653624-25006-1-git-send-email-grygorii.strashko@ti.com>
Date: Fri, 27 Nov 2015 21:47:04 +0200
From: Grygorii Strashko <grygorii.strashko@...com>
To: Russell King <linux@....linux.org.uk>,
Daniel Lezcano <daniel.lezcano@...aro.org>,
Thomas Gleixner <tglx@...utronix.de>,
Srinivas Kandagatla <srinivas.kandagatla@...il.com>,
Maxime Coquelin <maxime.coquelin@...com>
CC: <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>, <kernel@...inux.com>,
<linux-omap@...r.kernel.org>,
Grygorii Strashko <grygorii.strashko@...com>,
Arnd Bergmann <arnd@...db.de>,
John Stultz <john.stultz@...aro.org>,
Felipe Balbi <balbi@...com>, Tony Lindgren <tony@...mide.com>,
Santosh Shilimkar <ssantosh@...nel.org>,
Marc Zyngier <marc.zyngier@....com>
Subject: [PATCH v3] clocksource: arm_global_timer: fix suspend resume
Now the System stall is observed on TI AM437x based board
(am437x-gp-evm) during resuming from System suspend when ARM Global
timer is selected as clocksource device (CPUIdle not enabled) - SysRq are working,
but nothing else.
The reason of stall is that ARM Global timer loses its contexts during
System suspend:
GT_CONTROL.TIMER_ENABLE = 0 (unbanked)
GT_COUNTERx = 0
Hence, update ARM Global timer driver to reflect above behaviour
- re-enable ARM Global timer on resume GT_CONTROL.TIMER_ENABLE = 1.
CC: Arnd Bergmann <arnd@...db.de>
Cc: John Stultz <john.stultz@...aro.org>
Cc: Felipe Balbi <balbi@...com>
Cc: Tony Lindgren <tony@...mide.com>
Cc: Santosh Shilimkar <ssantosh@...nel.org>
Cc: Marc Zyngier <marc.zyngier@....com>
Signed-off-by: Grygorii Strashko <grygorii.strashko@...com>
---
Changes in v3:
- dropped all DT specific code
Changes in v2:
- suspend/resume simplified: nothing is stored any more and
ARM GT just re-enabled
Link on v2:
https://lkml.org/lkml/2015/11/20/355
Link on v1:
https://lkml.org/lkml/2015/11/13/456
drivers/clocksource/arm_global_timer.c | 7 +++++++
1 file changed, 7 insertions(+)
diff --git a/drivers/clocksource/arm_global_timer.c b/drivers/clocksource/arm_global_timer.c
index a2cb6fa..10d1417 100644
--- a/drivers/clocksource/arm_global_timer.c
+++ b/drivers/clocksource/arm_global_timer.c
@@ -195,12 +195,19 @@ static cycle_t gt_clocksource_read(struct clocksource *cs)
return gt_counter_read();
}
+static void gt_resume(struct clocksource *cs)
+{
+ /* re-enable timer on resume */
+ writel(GT_CONTROL_TIMER_ENABLE, gt_base + GT_CONTROL);
+}
+
static struct clocksource gt_clocksource = {
.name = "arm_global_timer",
.rating = 300,
.read = gt_clocksource_read,
.mask = CLOCKSOURCE_MASK(64),
.flags = CLOCK_SOURCE_IS_CONTINUOUS,
+ .resume = gt_resume,
};
#ifdef CONFIG_CLKSRC_ARM_GLOBAL_TIMER_SCHED_CLOCK
--
2.6.3
--
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