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Date: Thu, 16 Feb 2017 18:27:59 +0100 From: Alexandre Belloni <alexandre.belloni@...e-electrons.com> To: Wolfram Sang <wsa@...-dreams.de> Cc: Ludovic Desroches <ludovic.desroches@...el.com>, linux-i2c@...r.kernel.org, linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Alexandre Belloni <alexandre.belloni@...e-electrons.com> Subject: [PATCH v2] i2c: at91: ensure state is restored after suspending 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> --- 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
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