From: Russell King Date: Tue, 24 Jan 2012 09:23:19 +0000 (+0000) Subject: ARM: sa11x0: assabet: avoid glitching GPIOs when setting outputs X-Git-Url: http://drtracing.org/?a=commitdiff_plain;h=4f592e6d1a6711b2ef140b5c76342dbe2506c8cb;p=deliverable%2Flinux.git ARM: sa11x0: assabet: avoid glitching GPIOs when setting outputs Avoid glitching the GPIO signals during initialization, which can have undesirable effects. Ensure that the desired pin state is set before we change the GPIO pin direction to be an output. Signed-off-by: Russell King --- diff --git a/arch/arm/mach-sa1100/assabet.c b/arch/arm/mach-sa1100/assabet.c index 3a3282e08a70..6356896587bf 100644 --- a/arch/arm/mach-sa1100/assabet.c +++ b/arch/arm/mach-sa1100/assabet.c @@ -202,8 +202,8 @@ static void __init assabet_init(void) /* * Ensure that the power supply is in "high power" mode. */ - GPDR |= GPIO_GPIO16; GPSR = GPIO_GPIO16; + GPDR |= GPIO_GPIO16; /* * Ensure that these pins are set as outputs and are driving @@ -211,8 +211,8 @@ static void __init assabet_init(void) * the WS latch in the CPLD, and we don't float causing * excessive power drain. --rmk */ - GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; GPCR = GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; + GPDR |= GPIO_SSP_TXD | GPIO_SSP_SCLK | GPIO_SSP_SFRM; /* * Set up registers for sleep mode.