diff options
| author | Vic Yang <victoryang@google.com> | 2015-02-04 11:28:53 -0800 |
|---|---|---|
| committer | ChromeOS Commit Bot <chromeos-commit-bot@chromium.org> | 2015-02-10 10:47:07 +0000 |
| commit | 049463f8ad985f9cb996caa7dbc5438383bd3084 (patch) | |
| tree | 93ff78695657a998919c6d6e28101cd158489368 /chip/stm32/gpio.c | |
| parent | a9ae00b10129feca28713a7b88978ff6cfe7c2a6 (diff) | |
| download | chrome-ec-049463f8ad985f9cb996caa7dbc5438383bd3084.tar.gz | |
stm32: Add delay after enabling peripheral clock
We need a dummy read after enabling AHB peripheral clock before we can
access the peripheral. For APB, we also need a dummy read for STM32F3.
BRANCH=All affected
BUG=chrome-os-partner:33007
TEST=make buildall
Change-Id: I47f4a024dca294f555428c3f2053c1d32835ebe0
Signed-off-by: Vic Yang <victoryang@google.com>
Reviewed-on: https://chromium-review.googlesource.com/246181
Reviewed-by: Alec Berg <alecaberg@chromium.org>
Reviewed-by: Randall Spangler <rspangler@chromium.org>
Tested-by: Vic Yang <victoryang@chromium.org>
Commit-Queue: Vic Yang <victoryang@chromium.org>
Diffstat (limited to 'chip/stm32/gpio.c')
| -rw-r--r-- | chip/stm32/gpio.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/chip/stm32/gpio.c b/chip/stm32/gpio.c index 0c73081b42..6715e540b0 100644 --- a/chip/stm32/gpio.c +++ b/chip/stm32/gpio.c @@ -5,6 +5,7 @@ /* GPIO module for Chrome EC */ +#include "clock.h" #include "common.h" #include "console.h" #include "gpio.h" @@ -28,6 +29,9 @@ void gpio_pre_init(void) /* Required to configure external IRQ lines (SYSCFG_EXTICRn) */ STM32_RCC_APB2ENR |= 1 << 0; + /* Delay 1 APB clock cycle after the clock is enabled */ + clock_wait_bus_cycles(BUS_APB, 1); + if (!is_warm) gpio_enable_clocks(); |