[PATCH 4.4 39/46] i2c: at91: ensure state is restored after suspending

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

--

From: Alexandre Belloni 


[ 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 
Acked-by: Ludovic Desroches 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman 
---
 drivers/i2c/busses/i2c-at91.c |3 +++
 1 file changed, 3 insertions(+)

--- 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
 
 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
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
 
+   at91_init_twi_bus(twi_dev);
+
return 0;
 }
 

[PATCH 4.4 39/46] i2c: at91: ensure state is restored after suspending

[Greg Kroah-Hartman]

4.4-stable review patch.  If anyone has any objections, please let me know.

--

From: Alexandre Belloni 


[ 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 
Acked-by: Ludovic Desroches 
Signed-off-by: Wolfram Sang 
Signed-off-by: Sasha Levin 
Signed-off-by: Greg Kroah-Hartman 
---
 drivers/i2c/busses/i2c-at91.c |3 +++
 1 file changed, 3 insertions(+)

--- 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
 
 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
pm_runtime_mark_last_busy(dev);
pm_request_autosuspend(dev);
 
+   at91_init_twi_bus(twi_dev);
+
return 0;
 }