From 5aff021c61fffa9f6a58038db98e8dc29598813b Mon Sep 17 00:00:00 2001 From: Wei Ni Date: Mon, 2 Apr 2012 13:18:58 +0000 Subject: [PATCH] tegra: Turn off power detect in board init Tegra core power rail has leakage voltage around 0.2V while system in suspend mode. The source of the leakage should be coming from PMC power detect logic for IO rails power detection. That can be disabled by writing a '0' to PWR_DET_LATCH followed by writing '0' to PWR_DET (APBDEV_PMC_PWR_DET_0). Signed-off-by: Simon Glass Signed-off-by: Tom Warren --- board/nvidia/common/board.c | 18 ++++++++++++++++++ 1 file changed, 18 insertions(+) diff --git a/board/nvidia/common/board.c b/board/nvidia/common/board.c index b82e61a692..1d6b002702 100644 --- a/board/nvidia/common/board.c +++ b/board/nvidia/common/board.c @@ -61,6 +61,21 @@ void __pin_mux_usb(void) void pin_mux_usb(void) __attribute__((weak, alias("__pin_mux_usb"))); +/* + * Routine: power_det_init + * Description: turn off power detects + */ +static void power_det_init(void) +{ +#if defined(CONFIG_TEGRA2) + struct pmc_ctlr *const pmc = (struct pmc_ctlr *)TEGRA2_PMC_BASE; + + /* turn off power detects */ + writel(0, &pmc->pmc_pwr_det_latch); + writel(0, &pmc->pmc_pwr_det); +#endif +} + /* * Routine: board_init * Description: Early hardware init. @@ -79,6 +94,9 @@ int board_init(void) #endif /* boot param addr */ gd->bd->bi_boot_params = (NV_PA_SDRAM_BASE + 0x100); + + power_det_init(); + #ifdef CONFIG_TEGRA_I2C #ifndef CONFIG_SYS_I2C_INIT_BOARD #error "You must define CONFIG_SYS_I2C_INIT_BOARD to use i2c on Nvidia boards"