diff options
| author | Ronald G. Minnich <rminnich@google.com> | 2013-06-18 13:02:23 -0700 |
|---|---|---|
| committer | Stefan Reinauer <stefan.reinauer@coreboot.org> | 2013-07-10 22:35:15 +0200 |
| commit | 32450568bc03d7b648d13755345cc647b97664f1 (patch) | |
| tree | c24e165340413f6cd882f28c69a42686e097492e /src/cpu/samsung/exynos5420/gpio.c | |
| parent | c883fdc964207d3871e8609c67988c07d448a87d (diff) | |
ARM: when setting a GPIO to put, set the value, then the direction
We saw a problem on x86 last year in which setting direction, then value,
glitched the output and caused problems. Change this code to set the output,
then the direction.
Change-Id: I3e1e17ffe82ae270eea539530368a58c6cfe0ebe
Signed-off-by: Ronald G. Minnich <rminnich@google.com>
Signed-off-by: Gabe Black <gabeblack@chromium.org>
Reviewed-on: http://review.coreboot.org/3679
Tested-by: build bot (Jenkins)
Reviewed-by: Stefan Reinauer <stefan.reinauer@coreboot.org>
Diffstat (limited to 'src/cpu/samsung/exynos5420/gpio.c')
| -rw-r--r-- | src/cpu/samsung/exynos5420/gpio.c | 4 |
1 files changed, 2 insertions, 2 deletions
diff --git a/src/cpu/samsung/exynos5420/gpio.c b/src/cpu/samsung/exynos5420/gpio.c index b8ebb0a4ed..2a93328a70 100644 --- a/src/cpu/samsung/exynos5420/gpio.c +++ b/src/cpu/samsung/exynos5420/gpio.c @@ -170,14 +170,14 @@ int gpio_direction_output(unsigned gpio, int value) unsigned int val; struct gpio_bank *bank = gpio_get_bank(gpio); - gpio_cfg_pin(gpio, GPIO_OUTPUT); - val = readl(&bank->dat); val &= ~DAT_MASK(GPIO_BIT(gpio)); if (value) val |= DAT_SET(GPIO_BIT(gpio)); writel(val, &bank->dat); + gpio_cfg_pin(gpio, GPIO_OUTPUT); + return 0; } |