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authorAlexandre Belloni <alexandre.belloni@free-electrons.com>2017-02-16 18:27:59 +0100
committerWolfram Sang <wsa@the-dreams.de>2017-02-20 19:23:52 +0100
commite3ccc921b7d8fd1fcd10a00720e09823d8078666 (patch)
tree29334e01278970ba79ec4b28b432ada45fb5a9da /drivers/i2c
parentababb08938df7ac245d30a58b95b94ecf8dc04fc (diff)
downloadlinux-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>
Diffstat (limited to 'drivers/i2c')
-rw-r--r--drivers/i2c/busses/i2c-at91.c3
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;
}