On 03/18/2013 02:13 AM, Joseph Lo wrote:
> Adding suspend to RAM support for Tegra platform. There are three suspend
> mode for Tegra. The difference were below.
>
> * LP2: CPU voltage off
> * LP1: CPU voltage off, DRAM in self-refresh
> * LP0: CPU + Core voltage off, DRAM in self-refresh
>
> After this patch, the LP2 suspend mode will be supported.
> diff --git a/arch/arm/mach-tegra/common.c b/arch/arm/mach-tegra/common.c
> index c84505c..024f355 100644
> --- a/arch/arm/mach-tegra/common.c
> +++ b/arch/arm/mach-tegra/common.c
> @@ -66,6 +66,7 @@ void __init tegra_dt_init_irq(void)
> tegra_init_irq();
> irqchip_init();
> tegra_legacy_irq_syscore_init();
> + tegra_init_suspend();
Does that have to be part of tegra_dt_init_irq()? Can't we initialize
suspend support in some later hook. init_irq() should just initialize IRQs.
> diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c
> -void set_power_timers(unsigned long us_on, unsigned long us_off)
> +static void set_power_timers(u32 us_on, u32 us_off, unsigned long rate)
> {
> unsigned long long ticks;
> unsigned long long pclk;
> - unsigned long rate;
> static unsigned long tegra_last_pclk;
>
> - rate = clk_get_rate(tegra_pclk);
> -
> if (WARN_ON_ONCE(rate <= 0))
> pclk = 100000000;
> else
I don't think the code compiles after that?
The code must both compile and execute correctly after each patch is
applied, without relying on any future patches.
> +void tegra_pmc_pm_set(enum tegra_suspend_mode mode)
> +{
> + u32 reg;
> + unsigned long rate = 0;
> +
> + reg = tegra_pmc_readl(PMC_CTRL);
> + reg |= TEGRA_POWER_CPU_PWRREQ_OE;
> + reg &= ~TEGRA_POWER_EFFECT_LP0;
> +
> + switch (mode) {
> + case TEGRA_SUSPEND_LP2:
> + rate = clk_get_rate(tegra_pclk);
That isn't used anywhere.
> +void tegra_pmc_suspend_init(void)
> +{
> + u32 reg;
> +
> + /* Always enable CPU power request; just normal polarity is supported */
> + reg = tegra_pmc_readl(PMC_CTRL);
> + BUG_ON(reg & TEGRA_POWER_CPU_PWRREQ_POLARITY);
Why is that comment true? What does it take to support arbitrary
polarity; just flipping the OE bit in the register?
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