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stm32: i2c: Inhibit deep sleep when addressed in slave mode

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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>
This commit is contained in:
Shawn Nematbakhsh
2015-09-30 14:37:51 -07:00
committed by chrome-bot
parent 29162aeecc
commit 63d7b7b6f4
1 changed files with 6 additions and 0 deletions
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6
chip/stm32/i2c-stm32f0.c
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@@ -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 */