diff options
| author | Alexandre Belloni <alexandre.belloni@free-electrons.com> | 2017-02-16 18:27:59 +0100 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-10-21 17:09:06 +0200 |
| commit | c128baf6a1bcc58590448ac4a7157e6428687110 (patch) | |
| tree | 30d1e27187c61db4203aea3772ad3cea3efc23a7 /drivers/i2c | |
| parent | d7ecae7266986099a00595a017623d75d6d742bf (diff) | |
i2c: at91: ensure state is restored after suspending
[ Upstream commit e3ccc921b7d8fd1fcd10a00720e09823d8078666 ]
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>
Signed-off-by: Sasha Levin <alexander.levin@verizon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/i2c')
| -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 10835d1f559b..dee0fc421054 100644 --- a/drivers/i2c/busses/i2c-at91.c +++ b/drivers/i2c/busses/i2c-at91.c @@ -1131,6 +1131,7 @@ 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)) { @@ -1142,6 +1143,8 @@ 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; } |