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ARM: sa11x0: assabet: avoid glitching GPIOs when setting outputs

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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 <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King
2012-01-24 09:23:19 +00:00
parent 7186fb9fd7
commit 4f592e6d1a
1 changed files with 2 additions and 2 deletions
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arch/arm/mach-sa1100/assabet.c
+2 -2
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@@ -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.