From 4ceda5f654c350faa5b80f89625673a882735a54 Mon Sep 17 00:00:00 2001 From: Johan Hovold Date: Tue, 22 Jan 2019 18:22:54 +0100 Subject: gnss: sirf: force hibernate mode on probe Make sure to put the receiver in hibernate mode in case it is already active during probe in order to avoid wasting power until first open or suspend. This can happen, for example, after a reset or non-clean shutdown, and possibly also due to glitches during power-on. Reported-by: Andreas Kemnade Signed-off-by: Johan Hovold --- drivers/gnss/sirf.c | 17 +++++++++++++++++ 1 file changed, 17 insertions(+) (limited to 'drivers/gnss') diff --git a/drivers/gnss/sirf.c b/drivers/gnss/sirf.c index 8e3f6a776e02..f9a9d00dec98 100644 --- a/drivers/gnss/sirf.c +++ b/drivers/gnss/sirf.c @@ -320,6 +320,11 @@ static int sirf_probe(struct serdev_device *serdev) } if (data->wakeup) { + ret = gpiod_get_value_cansleep(data->wakeup); + if (ret < 0) + goto err_disable_vcc; + data->active = ret; + ret = gpiod_to_irq(data->wakeup); if (ret < 0) goto err_disable_vcc; @@ -332,6 +337,18 @@ static int sirf_probe(struct serdev_device *serdev) goto err_disable_vcc; } + if (data->on_off) { + /* Force hibernate mode if already active. */ + if (data->active) { + ret = sirf_set_active(data, false); + if (ret) { + dev_err(dev, "failed to set hibernate mode: %d\n", + ret); + goto err_free_irq; + } + } + } + if (IS_ENABLED(CONFIG_PM)) { pm_runtime_set_suspended(dev); /* clear runtime_error flag */ pm_runtime_enable(dev); -- cgit v1.2.3