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| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-02-16 18:27:59 +0100 |
|---|---|---|
| committer | Wolfram Sang <wsa@the-dreams.de> | 2017-02-20 19:23:52 +0100 |
| commit | e3ccc921b7d8fd1fcd10a00720e09823d8078666 (patch) | |
| tree | 29334e01278970ba79ec4b28b432ada45fb5a9da | |
| parent | ababb08938df7ac245d30a58b95b94ecf8dc04fc (diff) | |
| download | linux-e3ccc921b7d8fd1fcd10a00720e09823d8078666.tar.bz2 | |
i2c: at91: ensure state is restored after suspending
When going to suspend, the I2C registers may be lost because the power to
VDDcore is cut. Restore them when resuming.
Signed-off-by: Alexandre Belloni <alexandre.belloni@free-electrons.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
| -rw-r--r-- | drivers/i2c/busses/i2c-at91.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index e4fcb0c2bc97..fabbb9e49161 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -1180,6 +1180,7 @@ static int at91_twi_suspend_noirq(struct device *dev) static int at91_twi_resume_noirq(struct device *dev) { + struct at91_twi_dev *twi_dev = dev_get_drvdata(dev); int ret; if (!pm_runtime_status_suspended(dev)) { @@ -1191,6 +1192,8 @@ static int at91_twi_resume_noirq(struct device *dev) pm_runtime_mark_last_busy(dev); pm_request_autosuspend(dev); + at91_init_twi_bus(twi_dev); + return 0; } |