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| author | Russell King <rmk@dyn-67.arm.linux.org.uk> | 2008-01-23 12:33:31 +0000 |
|---|---|---|
| committer | Russell King <rmk+kernel@arm.linux.org.uk> | 2008-01-26 15:07:57 +0000 |
| commit | fd8e7af8d0fd3febc87607214d5dd545089edc71 (patch) | |
| tree | 5d51c6dbf975700377fa6f81d158cdf939f053e2 | |
| parent | 7b5dea12346f98b0624e00ef585246bfec8b0959 (diff) | |
| download | kernel_samsung_smdk4412-fd8e7af8d0fd3febc87607214d5dd545089edc71.tar.gz kernel_samsung_smdk4412-fd8e7af8d0fd3febc87607214d5dd545089edc71.tar.bz2 kernel_samsung_smdk4412-fd8e7af8d0fd3febc87607214d5dd545089edc71.zip | |
[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>
| -rw-r--r-- | arch/arm/mach-pxa/pxa25x.c | 2 | ||||
| -rw-r--r-- | arch/arm/mach-pxa/pxa27x.c | 6 |
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; |