| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.4 39/46] i2c: at91: ensure state is restored after suspending | Date | Thu, 19 Oct 2017 15:49:15 +0200 |
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4.4-stable review patch. If anyone has any objections, please let me know.
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From: Alexandre Belloni <alexandre.belloni@free-electrons.com>
[ 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@free-electrons.com> Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com> Signed-off-by: Wolfram Sang <wsa@the-dreams.de> Signed-off-by: Sasha Levin <alexander.levin@verizon.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org> --- 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; }
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