Commit e3ccc921 authored Feb 16, 2017 by Alexandre Belloni Committed by Wolfram Sang Feb 20, 2017

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>

parent ababb089

drivers/i2c/busses/i2c-at91.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -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;
		}