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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>
This commit is contained in:
Alexandre Belloni 2017-02-16 18:27:59 +01:00 committed by Wolfram Sang
parent ababb08938
commit e3ccc921b7
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/busses/i2c-at91.c
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@ -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;
}