6.13-stable review patch. If anyone has any objections, please let me know.
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From: Ming Wang wangming01@loongson.cn
[ Upstream commit 09471d8f5b390883eaf21b917c4bf3ced1b8a1df ]
The TOY_MATCH0_REG should be cleared to 0 in the RTC interrupt handler, otherwise the interrupt cannot be cleared, which will cause the loongson_rtc_isr() to be triggered multiple times.
The previous code cleared TOY_MATCH0_REG in the loongson_rtc_handler(), which is an ACPI interrupt. This did not prevent loongson_rtc_isr() from being triggered multiple times.
This commit moves the clearing of TOY_MATCH0_REG to the loongson_rtc_isr() to ensure that the interrupt is properly cleared.
Fixes: 1b733a9ebc3d ("rtc: Add rtc driver for the Loongson family chips") Signed-off-by: Ming Wang wangming01@loongson.cn Reviewed-by: Huacai Chen chenhuacai@loongson.cn Reviewed-by: Keguang Zhang keguang.zhang@gmail.com # on LS1B Tested-by: Keguang Zhang keguang.zhang@gmail.com Link: https://lore.kernel.org/r/20241205114307.1891418-1-wangming01@loongson.cn Signed-off-by: Alexandre Belloni alexandre.belloni@bootlin.com Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/rtc/rtc-loongson.c | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-)
diff --git a/drivers/rtc/rtc-loongson.c b/drivers/rtc/rtc-loongson.c index 8d713e563d7c0..a0f7974e6a570 100644 --- a/drivers/rtc/rtc-loongson.c +++ b/drivers/rtc/rtc-loongson.c @@ -114,6 +114,13 @@ static irqreturn_t loongson_rtc_isr(int irq, void *id) struct loongson_rtc_priv *priv = (struct loongson_rtc_priv *)id;
rtc_update_irq(priv->rtcdev, 1, RTC_AF | RTC_IRQF); + + /* + * The TOY_MATCH0_REG should be cleared 0 here, + * otherwise the interrupt cannot be cleared. + */ + regmap_write(priv->regmap, TOY_MATCH0_REG, 0); + return IRQ_HANDLED; }
@@ -131,11 +138,7 @@ static u32 loongson_rtc_handler(void *id) writel(RTC_STS, priv->pm_base + PM1_STS_REG); spin_unlock(&priv->lock);
- /* - * The TOY_MATCH0_REG should be cleared 0 here, - * otherwise the interrupt cannot be cleared. - */ - return regmap_write(priv->regmap, TOY_MATCH0_REG, 0); + return ACPI_INTERRUPT_HANDLED; }
static int loongson_rtc_set_enabled(struct device *dev)