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| author | Shawn Nematbakhsh <shawnn@chromium.org> | 2015-09-30 14:37:51 -0700 |
|---|---|---|
| committer | chrome-bot <chrome-bot@chromium.org> | 2015-09-30 23:19:54 -0700 |
| commit | 63d7b7b6f4e3c49c5c8d03c189adfe76f2fc6732 (patch) | |
| tree | 6417c3a5afb7b4fe55fc339624e2f0b53ce8007f | |
| parent | 29162aeeccdbe46ea2b17df105d61f379e6581f2 (diff) | |
| download | chrome-ec-63d7b7b6f4e3c49c5c8d03c189adfe76f2fc6732.tar.gz | |
stm32: i2c: Inhibit deep sleep when addressed in slave mode
According to the stm32 databook, we cannot enter deep sleep when an i2c
slave interface is addressed until it sees a stop condition.
BUG=chrome-os-partner:45010
TEST=Enable deep sleep on glados_pd, verify that the PD state machine
doesn't toggle between disconnect and debounce (no console spam)
BRANCH=None
Change-Id: I2016c30bccec916d1c22df93303acf50331bd318
Signed-off-by: Shawn Nematbakhsh <shawnn@chromium.org>
Reviewed-on: https://chromium-review.googlesource.com/303404
Commit-Ready: Shawn N <shawnn@chromium.org>
Tested-by: Shawn N <shawnn@chromium.org>
Reviewed-by: Alec Berg <alecaberg@chromium.org>
| -rw-r--r-- | chip/stm32/i2c-stm32f0.c | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/chip/stm32/i2c-stm32f0.c b/chip/stm32/i2c-stm32f0.c index 4d2da2a353..8685ef5911 100644 --- a/chip/stm32/i2c-stm32f0.c +++ b/chip/stm32/i2c-stm32f0.c @@ -12,6 +12,7 @@ #include "host_command.h" #include "i2c.h" #include "registers.h" +#include "system.h" #include "task.h" #include "timer.h" #include "usb_pd_tcpc.h" @@ -267,6 +268,8 @@ static void i2c_event_handler(int port) /* Clear ADDR bit by writing to ADDRCF bit */ STM32_I2C_ICR(port) |= STM32_I2C_ICR_ADDRCF; + /* Inhibit stop mode when addressed until STOPF flag is set */ + disable_sleep(SLEEP_MASK_I2C_SLAVE); } /* Stop condition on bus */ @@ -289,6 +292,9 @@ static void i2c_event_handler(int port) /* Clear STOPF bit by writing to STOPCF bit */ STM32_I2C_ICR(port) |= STM32_I2C_ICR_STOPCF; + + /* No longer inhibit deep sleep after stop condition */ + enable_sleep(SLEEP_MASK_I2C_SLAVE); } /* Receiver full event */ |