From: Rajendra Nayak Date: Fri, 24 Sep 2010 16:23:18 +0000 (-0600) Subject: OMAP4: PM: Declare idle modules as functional too X-Git-Tag: v2.6.37-rc1~121^2~51^2~1 X-Git-Url: https://openfabrics.org/gitweb/?a=commitdiff_plain;h=ff173d45525701d65d394cb8687e71845bfb34dc;p=~shefty%2Frdma-dev.git OMAP4: PM: Declare idle modules as functional too The omap4_cm_wait_module_ready function would only check for the modules to be completely functional before declaring them ready to be accessed. There might also be instances where in the module is actually in idle (under h/w control) but should still be declared accessible, as the h/w control would make it functional when needed. Hence make omap4_cm_wait_module_ready return true in case the module is fully functional *or* in idle state. Fail only if the module is fully disabled or stuck intransition. The explaination from the TRM for the idlest bits on OMAP4 is as below for quick reference Module idle state: 0x0 func: Module is fully functional, including OCP 0x1 trans: Module is performing transition: wakeup, or sleep, or sleep abortion 0x2 idle: Module is in Idle mode (only OCP part). It is functional if using separate functional clock 0x3 disabled: Module is disabled and cannot be accessed Signed-off-by: Rajendra Nayak Signed-off-by: Partha Basak Signed-off-by: Benoit Cousson Signed-off-by: Paul Walmsley --- diff --git a/arch/arm/mach-omap2/cm4xxx.c b/arch/arm/mach-omap2/cm4xxx.c index b101091e95d..f8a660a1a4a 100644 --- a/arch/arm/mach-omap2/cm4xxx.c +++ b/arch/arm/mach-omap2/cm4xxx.c @@ -43,7 +43,6 @@ * using separate functional clock * 0x3 disabled: Module is disabled and cannot be accessed * - * TODO: Need to handle module accessible in idle state */ int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg) { @@ -52,9 +51,11 @@ int omap4_cm_wait_module_ready(void __iomem *clkctrl_reg) if (!clkctrl_reg) return 0; - omap_test_timeout(((__raw_readl(clkctrl_reg) & - OMAP4430_IDLEST_MASK) == 0), - MAX_MODULE_READY_TIME, i); + omap_test_timeout(( + ((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) == 0) || + (((__raw_readl(clkctrl_reg) & OMAP4430_IDLEST_MASK) >> + OMAP4430_IDLEST_SHIFT) == 0x2)), + MAX_MODULE_READY_TIME, i); return (i < MAX_MODULE_READY_TIME) ? 0 : -EBUSY; }