From 444f9a8030ecda8dedd374fc3efed03d9f20e9cb Mon Sep 17 00:00:00 2001 From: Joseph Lo Date: Mon, 12 Aug 2013 17:40:01 +0800 Subject: [PATCH] ARM: tegra: config the polarity of the request of sys clock When suspending to LP1 mode, the SYSCLK will be clock gated. And different board may have different polarity of the request of SYSCLK, this patch configure the polarity from the DT for the board. Signed-off-by: Joseph Lo Signed-off-by: Stephen Warren --- arch/arm/mach-tegra/pmc.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/arch/arm/mach-tegra/pmc.c b/arch/arm/mach-tegra/pmc.c index 8345fcd..03e6405 100644 --- a/arch/arm/mach-tegra/pmc.c +++ b/arch/arm/mach-tegra/pmc.c @@ -27,6 +27,8 @@ #include "pmc.h" #include "sleep.h" +#define TEGRA_POWER_SYSCLK_POLARITY (1 << 10) /* sys clk polarity */ +#define TEGRA_POWER_SYSCLK_OE (1 << 11) /* system clock enable */ #define TEGRA_POWER_EFFECT_LP0 (1 << 14) /* LP0 when CPU pwr gated */ #define TEGRA_POWER_CPU_PWRREQ_POLARITY (1 << 15) /* CPU pwr req polarity */ #define TEGRA_POWER_CPU_PWRREQ_OE (1 << 16) /* CPU pwr req enable */ @@ -238,6 +240,20 @@ void tegra_pmc_suspend_init(void) reg = tegra_pmc_readl(PMC_CTRL); reg |= TEGRA_POWER_CPU_PWRREQ_OE; tegra_pmc_writel(reg, PMC_CTRL); + + reg = tegra_pmc_readl(PMC_CTRL); + + if (!pmc_pm_data.sysclkreq_high) + reg |= TEGRA_POWER_SYSCLK_POLARITY; + else + reg &= ~TEGRA_POWER_SYSCLK_POLARITY; + + /* configure the output polarity while the request is tristated */ + tegra_pmc_writel(reg, PMC_CTRL); + + /* now enable the request */ + reg |= TEGRA_POWER_SYSCLK_OE; + tegra_pmc_writel(reg, PMC_CTRL); } #endif -- 2.7.4