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rtc: snvs: make sure clock is enabled for interrupt handle

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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>
This commit is contained in:
Anson Huang 2019-01-11 07:09:02 +00:00 committed by Alexandre Belloni
parent f0c04c2767
commit edb190cb17
1 changed files with 6 additions and 0 deletions
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6
drivers/rtc/rtc-snvs.c
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@ -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;
}