diff options
Diffstat (limited to 'target/linux/s3c24xx/patches/0210-fix-no-uart-leak-when-gps-off.patch.patch')
| -rwxr-xr-x | target/linux/s3c24xx/patches/0210-fix-no-uart-leak-when-gps-off.patch.patch | 123 |
1 files changed, 123 insertions, 0 deletions
diff --git a/target/linux/s3c24xx/patches/0210-fix-no-uart-leak-when-gps-off.patch.patch b/target/linux/s3c24xx/patches/0210-fix-no-uart-leak-when-gps-off.patch.patch new file mode 100755 index 0000000000..0fc855918c --- /dev/null +++ b/target/linux/s3c24xx/patches/0210-fix-no-uart-leak-when-gps-off.patch.patch @@ -0,0 +1,123 @@ +From 75c6d53772b66d6d4237745a5d3185f836e05b70 Mon Sep 17 00:00:00 2001 +From: Andy Green <andy@openmoko.com> +Date: Fri, 25 Jul 2008 23:06:19 +0100 +Subject: [PATCH] fix-no-uart-leak-when-gps-off.patch + +During the suspend current reduction campaign on suspend I +forced the GPS UART to be GPIO and to drive 0 into the GPS +unit so we would not burn current there. On resume it lets +the pins act as UARTs again. But really, we should do this +all the time that the GPS unit is off, lest we leak it +enough power to hold internal state and make trouble. + +Signed-off-by: Andy Green <andy@openmoko.com> +--- + arch/arm/plat-s3c24xx/neo1973_pm_gps.c | 57 +++++++++++++------------------ + 1 files changed, 24 insertions(+), 33 deletions(-) + +diff --git a/arch/arm/plat-s3c24xx/neo1973_pm_gps.c b/arch/arm/plat-s3c24xx/neo1973_pm_gps.c +index 9c6adfa..8cd583d 100644 +--- a/arch/arm/plat-s3c24xx/neo1973_pm_gps.c ++++ b/arch/arm/plat-s3c24xx/neo1973_pm_gps.c +@@ -272,9 +272,23 @@ static void gps_pwron_set(int on) + + #ifdef CONFIG_MACH_NEO1973_GTA02 + if (machine_is_neo1973_gta02()) { +- if (on) ++ if (on) { + pcf50633_voltage_set(pcf50633_global, + PCF50633_REGULATOR_LDO5, 3000); ++ /* return UART pins to being UART pins */ ++ s3c2410_gpio_cfgpin(S3C2410_GPH4, S3C2410_GPH4_TXD1); ++ /* remove pulldown now it won't be floating any more */ ++ s3c2410_gpio_pullup(S3C2410_GPH5, 0); ++ } else { ++ /* ++ * take care not to power unpowered GPS from UART TX ++ * return them to GPIO and force low ++ */ ++ s3c2410_gpio_cfgpin(S3C2410_GPH4, S3C2410_GPH4_OUTP); ++ s3c2410_gpio_setpin(S3C2410_GPH4, 0); ++ /* don't let RX from unpowered GPS float */ ++ s3c2410_gpio_pullup(S3C2410_GPH5, 1); ++ } + pcf50633_onoff_set(pcf50633_global, + PCF50633_REGULATOR_LDO5, on); + } +@@ -284,21 +298,14 @@ static void gps_pwron_set(int on) + static int gps_pwron_get(void) + { + #ifdef CONFIG_MACH_NEO1973_GTA01 +- if (machine_is_neo1973_gta01()) { +- if (s3c2410_gpio_getpin(GTA01_GPIO_GPS_PWRON)) +- return 1; +- else +- return 0; +- } ++ if (machine_is_neo1973_gta01()) ++ return !!s3c2410_gpio_getpin(GTA01_GPIO_GPS_PWRON); + #endif /* CONFIG_MACH_NEO1973_GTA01 */ + + #ifdef CONFIG_MACH_NEO1973_GTA02 +- if (machine_is_neo1973_gta02()) { +- if (pcf50633_onoff_get(pcf50633_global, PCF50633_REGULATOR_LDO5)) +- return 1; +- else +- return 0; +- } ++ if (machine_is_neo1973_gta02()) ++ return !!pcf50633_onoff_get(pcf50633_global, ++ PCF50633_REGULATOR_LDO5); + #endif /* CONFIG_MACH_NEO1973_GTA02 */ + return -1; + } +@@ -496,15 +503,8 @@ static int gta01_pm_gps_suspend(struct platform_device *pdev, + #endif /* CONFIG_MACH_NEO1973_GTA01 */ + + #ifdef CONFIG_MACH_NEO1973_GTA02 +- if (machine_is_neo1973_gta02()) { +- /* take care not to power unpowered GPS from GPIO */ +- s3c2410_gpio_cfgpin(S3C2410_GPH4, S3C2410_GPH4_OUTP); +- s3c2410_gpio_setpin(S3C2410_GPH4, 0); +- /* don't let RX from unpowered GPS float */ +- s3c2410_gpio_pullup(S3C2410_GPH5, 1); +- ++ if (machine_is_neo1973_gta02()) + gps_pwron_set(0); +- } + #endif /* CONFIG_MACH_NEO1973_GTA02 */ + + return 0; +@@ -513,26 +513,17 @@ static int gta01_pm_gps_suspend(struct platform_device *pdev, + static int gta01_pm_gps_resume(struct platform_device *pdev) + { + #ifdef CONFIG_MACH_NEO1973_GTA01 +- if (machine_is_neo1973_gta01()) { ++ if (machine_is_neo1973_gta01()) + if (neo1973_gps.power_was_on) + gps_power_sequence_up(); +- } + #endif /* CONFIG_MACH_NEO1973_GTA01 */ + + #ifdef CONFIG_MACH_NEO1973_GTA02 +- if (machine_is_neo1973_gta02()) { +- /* +- * resume TXD1 function since we power GPS now... er.. +- * WTF? FIXME We always power GPS on resume ?? +- */ +- s3c2410_gpio_cfgpin(S3C2410_GPH4, S3C2410_GPH4_TXD1); +- /* remove pulldown now it won't be floating any more */ +- s3c2410_gpio_pullup(S3C2410_GPH5, 0); +- ++ if (machine_is_neo1973_gta02()) + if (neo1973_gps.power_was_on) + gps_pwron_set(1); + #endif /* CONFIG_MACH_NEO1973_GTA02 */ +- } ++ + return 0; + } + #else +-- +1.5.6.3 + |