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authorRussell King <rmk@dyn-67.arm.linux.org.uk>2008-01-23 12:33:31 +0000
committerRussell King <rmk+kernel@arm.linux.org.uk>2008-01-26 15:07:57 +0000
commitfd8e7af8d0fd3febc87607214d5dd545089edc71 (patch)
tree5d51c6dbf975700377fa6f81d158cdf939f053e2 /arch
parent7b5dea12346f98b0624e00ef585246bfec8b0959 (diff)
[ARM] pxa: Avoid fiddling with CKEN register on suspend
The PXA manuals indicate that when in standby or sleep modes, clocks to peripherals are shut off by the processor itself. Eg: PXA270 standby: "In standby mode, all clocks are disabled except those for the power manager and the RTC." PXA270 sleep: "In sleep mode, all clocks are disabled to the processor and to all peripherals except the RTC." PXA255 sleep: "In Sleep Mode, all processor and peripheral clocks are disabled, except the RTC." Therefore, it should be safe to leave the clock enable register alone prior to entering low power modes for these SoCs. Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
Diffstat (limited to 'arch')
-rw-r--r--arch/arm/mach-pxa/pxa25x.c2
-rw-r--r--arch/arm/mach-pxa/pxa27x.c6
2 files changed, 0 insertions, 8 deletions
diff --git a/arch/arm/mach-pxa/pxa25x.c b/arch/arm/mach-pxa/pxa25x.c
index 962cfbb5500..73a5f068e16 100644
--- a/arch/arm/mach-pxa/pxa25x.c
+++ b/arch/arm/mach-pxa/pxa25x.c
@@ -216,8 +216,6 @@ static void pxa25x_cpu_pm_restore(unsigned long *sleep_save)
static void pxa25x_cpu_pm_enter(suspend_state_t state)
{
- CKEN = 0;
-
switch (state) {
case PM_SUSPEND_MEM:
/* set resume return address */
diff --git a/arch/arm/mach-pxa/pxa27x.c b/arch/arm/mach-pxa/pxa27x.c
index f33c9d7ff87..db0c4c6fea9 100644
--- a/arch/arm/mach-pxa/pxa27x.c
+++ b/arch/arm/mach-pxa/pxa27x.c
@@ -265,12 +265,6 @@ void pxa27x_cpu_pm_enter(suspend_state_t state)
{
extern void pxa_cpu_standby(void);
- if (state == PM_SUSPEND_STANDBY)
- CKEN = (1 << CKEN_MEMC) | (1 << CKEN_OSTIMER) |
- (1 << CKEN_LCD) | (1 << CKEN_PWM0);
- else
- CKEN = (1 << CKEN_MEMC) | (1 << CKEN_OSTIMER);
-
/* ensure voltage-change sequencer not initiated, which hangs */
PCFR &= ~PCFR_FVC;