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Date: Wed, 11 Oct 2017 00:45:43 +0000 From: "Levin, Alexander (Sasha Levin)" <alexander.levin@...izon.com> To: "gregkh@...uxfoundation.org" <gregkh@...uxfoundation.org> CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>, "stable@...r.kernel.org" <stable@...r.kernel.org> Subject: [GIT PULL for-4.4 19/25] i2c: at91: ensure state is restored after suspending From: Alexandre Belloni <alexandre.belloni@...e-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@...e-electrons.com> Acked-by: Ludovic Desroches <ludovic.desroches@...rochip.com> Signed-off-by: Wolfram Sang <wsa@...-dreams.de> Signed-off-by: Sasha Levin <alexander.levin@...izon.com> --- 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 10835d1f559b..dee0fc421054 100644 --- 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 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)) { @@ -1142,6 +1143,8 @@ 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
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