This is a note to let you know that I've just added the patch titled
i2c: at91: ensure state is restored after suspending
to the 4.4-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
i2c-at91-ensure-state-is-restored-after-suspending.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From foo@baz Thu Oct 19 15:15:46 CEST 2017
From: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
Date: Thu, 16 Feb 2017 18:27:59 +0100
Subject: i2c: at91: ensure state is restored after suspending
From: Alexandre Belloni <alexandre.belloni@xxxxxxxxxxxxxxxxxx>
[ 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@xxxxxxxxxxxxxxxxxx>
Acked-by: Ludovic Desroches <ludovic.desroches@xxxxxxxxxxxxx>
Signed-off-by: Wolfram Sang <wsa@xxxxxxxxxxxxx>
Signed-off-by: Sasha Levin <alexander.levin@xxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
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;
}
Patches currently in stable-queue which might be from alexandre.belloni@xxxxxxxxxxxxxxxxxx are
queue-4.4/i2c-at91-ensure-state-is-restored-after-suspending.patch