From 506c7d7931317813b3142f57d44bf113102a2a8f Mon Sep 17 00:00:00 2001 From: Paul Walmsley Date: Mon, 30 Jan 2012 02:47:24 -0700 Subject: [PATCH] ARM: OMAP3: PM: remove superfluous calls to pwrdm_clear_all_prev_pwrst() Remove some superfluous calls to pwrdm_clear_all_prev_pwrst(). pwrdm_pre_transition(), which appears a few lines after these calls, invokes pwrdm_clear_all_prev_pwrst() on each powerdomain -- there's no need to do it twice. N.B.: some of us have observed that accesses to the previous powerstate registers seem to be quite slow. Although the writes removed by this patch should be buffered by the write buffer, there is a read to a PRM register immediately afterwards. That will block the OMAP3 MPU until all of those writes complete. So this patch should result in a minor performance improvement during idle entry. Signed-off-by: Paul Walmsley Cc: Rajendra Nayak Acked-by: Santosh Shilimkar Tested-by: Tero Kristo [khilman@ti.com: removed a couple more for OMAP4] Tested-by: Kevin Hilman Signed-off-by: Kevin Hilman --- arch/arm/mach-omap2/omap-mpuss-lowpower.c | 2 -- arch/arm/mach-omap2/pm34xx.c | 5 ----- 2 files changed, 7 deletions(-) diff --git a/arch/arm/mach-omap2/omap-mpuss-lowpower.c b/arch/arm/mach-omap2/omap-mpuss-lowpower.c index 1d5d010..bbabe1d 100644 --- a/arch/arm/mach-omap2/omap-mpuss-lowpower.c +++ b/arch/arm/mach-omap2/omap-mpuss-lowpower.c @@ -263,12 +263,10 @@ int omap4_enter_lowpower(unsigned int cpu, unsigned int power_state) * In MPUSS OSWR or device OFF, interrupt controller contest is lost. */ mpuss_clear_prev_logic_pwrst(); - pwrdm_clear_all_prev_pwrst(mpuss_pd); if ((pwrdm_read_next_pwrst(mpuss_pd) == PWRDM_POWER_RET) && (pwrdm_read_logic_retst(mpuss_pd) == PWRDM_POWER_OFF)) save_state = 2; - clear_cpu_prev_pwrst(cpu); cpu_clear_prev_logic_pwrst(cpu); set_cpu_next_pwrst(cpu, power_state); set_cpu_wakeup_addr(cpu, virt_to_phys(omap4_cpu_resume)); diff --git a/arch/arm/mach-omap2/pm34xx.c b/arch/arm/mach-omap2/pm34xx.c index b77df73..60279b3 100644 --- a/arch/arm/mach-omap2/pm34xx.c +++ b/arch/arm/mach-omap2/pm34xx.c @@ -290,11 +290,6 @@ void omap_sram_idle(void) int core_prev_state, per_prev_state; u32 sdrc_pwr = 0; - pwrdm_clear_all_prev_pwrst(mpu_pwrdm); - pwrdm_clear_all_prev_pwrst(neon_pwrdm); - pwrdm_clear_all_prev_pwrst(core_pwrdm); - pwrdm_clear_all_prev_pwrst(per_pwrdm); - mpu_next_state = pwrdm_read_next_pwrst(mpu_pwrdm); switch (mpu_next_state) { case PWRDM_POWER_ON: -- 2.7.4