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authorAnson Huang <anson.huang@nxp.com>2019-01-11 10:09:02 +0300
committerAlexandre Belloni <alexandre.belloni@bootlin.com>2019-02-06 01:11:31 +0300
commitedb190cb173416b9d7f59b3887ecc43f6d94a9ad (patch)
tree078ba7bf72ac4fae669e1e36e6013a88c32df3a7 /drivers/rtc/rtc-snvs.c
parentf0c04c276739ed8acbb41b4868e942a55b128dca (diff)
downloadlinux-edb190cb173416b9d7f59b3887ecc43f6d94a9ad.tar.xz
rtc: snvs: make sure clock is enabled for interrupt handle
During system suspend, the SNVS RTC's clock will be disabled in noirq suspend phase, but SNVS RTC's alarm interrupt could still arrive, system will hang if SNVS RTC driver tries to access register without clock enabled, this patch fixes the issue of this scenario. Signed-off-by: Anson Huang <Anson.Huang@nxp.com> Signed-off-by: Alexandre Belloni <alexandre.belloni@bootlin.com>
Diffstat (limited to 'drivers/rtc/rtc-snvs.c')
-rw-r--r--drivers/rtc/rtc-snvs.c6
1 files changed, 6 insertions, 0 deletions
diff --git a/drivers/rtc/rtc-snvs.c b/drivers/rtc/rtc-snvs.c
index b2483a749ac4..0b9eff19149b 100644
--- a/drivers/rtc/rtc-snvs.c
+++ b/drivers/rtc/rtc-snvs.c
@@ -239,6 +239,9 @@ static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
u32 lpsr;
u32 events = 0;
+ if (data->clk)
+ clk_enable(data->clk);
+
regmap_read(data->regmap, data->offset + SNVS_LPSR, &lpsr);
if (lpsr & SNVS_LPSR_LPTA) {
@@ -253,6 +256,9 @@ static irqreturn_t snvs_rtc_irq_handler(int irq, void *dev_id)
/* clear interrupt status */
regmap_write(data->regmap, data->offset + SNVS_LPSR, lpsr);
+ if (data->clk)
+ clk_disable(data->clk);
+
return events ? IRQ_HANDLED : IRQ_NONE;
}