[PATCH 3/5] ARM: twd: Add context save restore support
Russell King - ARM Linux
linux at arm.linux.org.uk
Mon Jan 24 06:11:15 EST 2011
On Mon, Jan 24, 2011 at 11:06:09AM +0000, Russell King - ARM Linux wrote:
> On Mon, Jan 24, 2011 at 02:21:17PM +0530, Santosh Shilimkar wrote:
> > In CPU low power state, local timer looses its register context. This
> > patch adds context save restore hooks which can be used by platforms
> > appropriately.
> I thought the whole point of CLOCK_EVT_FEAT_C3STOP was that the generic
> timer stuff wouldn't rely on it being kept alive?
> Hmm, it looks like we bypass the clockevents code by only setting the
> TWD load value at initialization time, not when we switch to periodic
> mode. We really ought to rewrite it whenever we switch back to periodic
> I suspect fixing that means you won't need this save/restore support.
Untested, but should do what's required.
diff --git a/arch/arm/kernel/smp_twd.c b/arch/arm/kernel/smp_twd.c
index fd91566..60636f4 100644
@@ -36,6 +36,7 @@ static void twd_set_mode(enum clock_event_mode mode,
/* timer load already set up */
ctrl = TWD_TIMER_CONTROL_ENABLE | TWD_TIMER_CONTROL_IT_ENABLE
+ __raw_writel(twd_timer_rate / HZ, twd_base + TWD_TIMER_LOAD);
/* period set, and timer enabled in 'next_event' hook */
@@ -81,7 +82,7 @@ int twd_timer_ack(void)
static void __cpuinit twd_calibrate_rate(void)
- unsigned long load, count;
+ unsigned long count;
@@ -116,10 +117,6 @@ static void __cpuinit twd_calibrate_rate(void)
printk("%lu.%02luMHz.\n", twd_timer_rate / 1000000,
(twd_timer_rate / 1000000) % 100);
- load = twd_timer_rate / HZ;
- __raw_writel(load, twd_base + TWD_TIMER_LOAD);
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