From mboxrd@z Thu Jan 1 00:00:00 1970 From: tomasz.figa@gmail.com (Tomasz Figa) Date: Wed, 20 Jul 2011 19:12:15 +0200 Subject: S3C6410 UART resume problem In-Reply-To: <1534460.6WAISbrX4v@flatron> References: <1534460.6WAISbrX4v@flatron> Message-ID: <8865715.7kkxAXkp10@flatron> To: linux-arm-kernel@lists.infradead.org List-Id: linux-arm-kernel.lists.infradead.org I have managed to implement a workaround that works for me, but I am not sure whether it could not be done in a better way. I have attached a patch based on Linux 2.6.38. P.S. Please excuse me sending my last message incorrectly, using To instead of CC fields, as my mail client automatically sets all address text fields as To and I have forgotten to switch them to CC. --- arch/arm/mach-s3c64xx/pm.c | 27 +++++++++++++++++++++++++++ 1 files changed, 27 insertions(+), 0 deletions(-) diff --git a/arch/arm/mach-s3c64xx/pm.c b/arch/arm/mach-s3c64xx/pm.c index 79412f7..7818bdd 100644 --- a/arch/arm/mach-s3c64xx/pm.c +++ b/arch/arm/mach-s3c64xx/pm.c @@ -22,6 +22,7 @@ #include #include +#include #include #include @@ -29,6 +30,8 @@ #include #include +#include + #ifdef CONFIG_S3C_PM_DEBUG_LED_SMDK #include @@ -101,12 +104,36 @@ void s3c_pm_configure_extint(void) void s3c_pm_restore_core(void) { + u32 pclkgate, tmp; + int i; + __raw_writel(0, S3C64XX_EINT_MASK); s3c_pm_debug_smdkled(1 << 2, 0); s3c_pm_do_restore_core(core_save, ARRAY_SIZE(core_save)); s3c_pm_do_restore(misc_save, ARRAY_SIZE(misc_save)); + + tmp = pclkgate = __raw_readl(S3C_PCLK_GATE); + + /* re-start uart clocks */ + tmp |= S3C_CLKCON_PCLK_UART0; + tmp |= S3C_CLKCON_PCLK_UART1; + tmp |= S3C_CLKCON_PCLK_UART2; + tmp |= S3C_CLKCON_PCLK_UART3; + + __raw_writel(tmp, S3C_PCLK_GATE); + + udelay(10); + + for (i = 0; i < 4; ++i) { + __raw_writel(15, S3C_VA_UARTx(i) + S3C64XX_UINTM); + __raw_writel(15, S3C_VA_UARTx(i) + S3C64XX_UINTP); + } + + udelay(10); + + __raw_writel(pclkgate, S3C_PCLK_GATE); } void s3c_pm_save_core(void) -- 1.7.6