From 86ffb0e83a55aef81e96a9cede28af576c9d5541 Mon Sep 17 00:00:00 2001 From: Abhilash Kesavan Date: Tue, 20 Nov 2012 18:20:45 +0900 Subject: ARM: EXYNOS: Fix i2c suspend/resume for legacy controller On resuming from suspend the i2c configuration register that is part of system controller resets to 0xf. This sets the interrupt source to the new high speed i2c rather than the legacy one that we are using. Save and restore the I2C_CFG register for exynos5 to fix this. Signed-off-by: Abhilash Kesavan Signed-off-by: Kukjin Kim --- arch/arm/mach-exynos/pm.c | 9 +++++++++ 1 file changed, 9 insertions(+) diff --git a/arch/arm/mach-exynos/pm.c b/arch/arm/mach-exynos/pm.c index c06c992943a1..8306c5276d1c 100644 --- a/arch/arm/mach-exynos/pm.c +++ b/arch/arm/mach-exynos/pm.c @@ -62,6 +62,10 @@ static struct sleep_save exynos4_vpll_save[] = { SAVE_ITEM(EXYNOS4_VPLL_CON1), }; +static struct sleep_save exynos5_sys_save[] = { + SAVE_ITEM(EXYNOS5_SYS_I2C_CFG), +}; + static struct sleep_save exynos_core_save[] = { /* SROM side */ SAVE_ITEM(S5P_SROM_BW), @@ -98,6 +102,7 @@ static void exynos_pm_prepare(void) s3c_pm_do_save(exynos4_epll_save, ARRAY_SIZE(exynos4_epll_save)); s3c_pm_do_save(exynos4_vpll_save, ARRAY_SIZE(exynos4_vpll_save)); } else { + s3c_pm_do_save(exynos5_sys_save, ARRAY_SIZE(exynos5_sys_save)); /* Disable USE_RETENTION of JPEG_MEM_OPTION */ tmp = __raw_readl(EXYNOS5_JPEG_MEM_OPTION); tmp &= ~EXYNOS5_OPTION_USE_RETENTION; @@ -301,6 +306,10 @@ static void exynos_pm_resume(void) __raw_writel((1 << 28), S5P_PAD_RET_EBIA_OPTION); __raw_writel((1 << 28), S5P_PAD_RET_EBIB_OPTION); + if (soc_is_exynos5250()) + s3c_pm_do_restore(exynos5_sys_save, + ARRAY_SIZE(exynos5_sys_save)); + s3c_pm_do_restore_core(exynos_core_save, ARRAY_SIZE(exynos_core_save)); if (!soc_is_exynos5250()) { -- cgit v1.2.3