Messages in this thread Patch in this message | | | From | Alexandre Belloni <> | Subject | [PATCH v2] i2c: at91: ensure state is restored after suspending | Date | Thu, 16 Feb 2017 18:27:59 +0100 |
| |
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> --- Changes in v2: - don't cache unecessary registers and simply call at91_init_twi_bus()
drivers/i2c/busses/i2c-at91.c | 3 +++ 1 file changed, 3 insertions(+)
diff --git a/drivers/i2c/busses/i2c-at91.c b/drivers/i2c/busses/i2c-at91.c index 0b86c6173e07..c925a690cb32 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; } -- 2.11.0
| |