From: Santosh Shilimkar Date: Fri, 19 Aug 2011 22:59:39 +0000 (-0600) Subject: OMAP: clockdomain: Wait for powerdomain to be ON when using clockdomain force wakeup X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=b1cbdb00d;p=linux-beck.git OMAP: clockdomain: Wait for powerdomain to be ON when using clockdomain force wakeup While using clockdomain force wakeup method, not waiting for powerdomain to be effectively ON may end up locking the clockdomain FSM until a next wakeup event occurs. One such issue was seen on OMAP4430, where L4_PER was periodically getting stuck in in-transition state when transitioning from from OSWR to ON. This issue was reported and investigated by Patrick Titiano Signed-off-by: Santosh Shilimkar Signed-off-by: Rajendra Nayak Reported-by: Patrick Titiano Cc: Kevin Hilman Cc: Benoit Cousson Cc: Paul Walmsley [paul@pwsan.com: updated to apply; added transition wait on clkdm_deny_idle(); remove two superfluous pwrdm_wait_transition() calls] Signed-off-by: Paul Walmsley --- diff --git a/arch/arm/mach-omap2/clockdomain.c b/arch/arm/mach-omap2/clockdomain.c index ab7db083f97f..8f0890685d7b 100644 --- a/arch/arm/mach-omap2/clockdomain.c +++ b/arch/arm/mach-omap2/clockdomain.c @@ -747,6 +747,7 @@ int clkdm_wakeup(struct clockdomain *clkdm) spin_lock_irqsave(&clkdm->lock, flags); clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; ret = arch_clkdm->clkdm_wakeup(clkdm); + ret |= pwrdm_state_switch(clkdm->pwrdm.ptr); spin_unlock_irqrestore(&clkdm->lock, flags); return ret; } @@ -818,6 +819,7 @@ void clkdm_deny_idle(struct clockdomain *clkdm) spin_lock_irqsave(&clkdm->lock, flags); clkdm->_flags &= ~_CLKDM_FLAG_HWSUP_ENABLED; arch_clkdm->clkdm_deny_idle(clkdm); + pwrdm_state_switch(clkdm->pwrdm.ptr); spin_unlock_irqrestore(&clkdm->lock, flags); } diff --git a/arch/arm/mach-omap2/pm.c b/arch/arm/mach-omap2/pm.c index 3feb35911a32..472bf22d5e84 100644 --- a/arch/arm/mach-omap2/pm.c +++ b/arch/arm/mach-omap2/pm.c @@ -130,7 +130,6 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) } else { hwsup = clkdm_in_hwsup(pwrdm->pwrdm_clkdms[0]); clkdm_wakeup(pwrdm->pwrdm_clkdms[0]); - pwrdm_wait_transition(pwrdm); sleep_switch = FORCEWAKEUP_SWITCH; } } @@ -156,7 +155,6 @@ int omap_set_pwrdm_state(struct powerdomain *pwrdm, u32 state) return ret; } - pwrdm_wait_transition(pwrdm); pwrdm_state_switch(pwrdm); err: return ret;