[PATCH 2/3] ARM: tegra: refactor the pmc_pm_set function

[josephl@nvidia.com (Joseph Lo)]

On Thu, 2013-03-14 at 01:52 +0800, Stephen Warren wrote:
> On 03/13/2013 02:27 AM, Joseph Lo wrote:
> > The pmc_pm_set function was designed for SoC to configure the related
> > settings when system going to some low power modes (e.g. platform
> > suspend or CPU idle powered-down mode). We refactor the function to make
> > it work on the usage.
> 
> > diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
> 
> > +#include <linux/clk-provider.h>
> 
> This code isn't a clock-provider, and hence shouldn't include that
> header file.
> 
> > +void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
> 
> > +	switch (mode) {
> > +	case TEGRA_SUSPEND_LP2:
> > +		rate = __clk_get_rate(tegra_pclk);
> 
> Doesn't regular clk_get_rate() work here?
> 
Actually it works. So I will use clk_get_rate() here and remove
clk-provider.

> > @@ -234,6 +229,9 @@ void tegra_pmc_suspend_init(void)
> >  {
> >  	u32 reg;
> >  
> > +	tegra_pclk = clk_get_sys(NULL, "pclk");
> > +	WARN_ON(IS_ERR(tegra_pclk));
> 
> Shouldn't this instead error out and/or disable any system suspend
> modes? Otherwise, tegra_pmc_pm_set() is going to call
> clk_get_rate(tegra_pclk), and tegra_pclk won't be a valid clock object.
OK.
> 
> Also, can you use regular clk_get() rather than clk_get_sys()? That'd
> need a clocks property in the PMC DT node.
OK.
> I guess I see now that this series does actually depend on the suspend
> series. However, stuff like:
> 
> > -u32 tegra_pmc_get_cpu_good_time(void)
> > -{
> > -	return pmc_pm_data.cpu_good_time;
> > -}
> > -
> > -u32 tegra_pmc_get_cpu_off_time(void)
> > -{
> > -	return pmc_pm_data.cpu_off_time;
> > -}
> 
> ... was actually added in that series, so if you put this series first,
> or merged the two series with these patches first, you could end up
> avoiding some churn.
Let me check how to reorganize them.

Thanks,
Joseph