From 99bded02dae5e1e2312813506c41dc8db2fb656c Mon Sep 17 00:00:00 2001
From: Yannick Brosseau <yannick.brosseau@gmail.com>
Date: Mon, 16 May 2022 16:39:39 -0400
Subject: [PATCH] iio: adc: stm32: Fix IRQs on STM32F4 by removing custom spurious IRQs message
Git-commit: 99bded02dae5e1e2312813506c41dc8db2fb656c
Patch-mainline: v5.19-rc4
References: git-fixes

The check for spurious IRQs introduced in 695e2f5c289bb assumed that the bits
in the control and status registers are aligned. This is true for the H7 and MP1
version, but not the F4. The interrupt was then never handled on the F4.

Instead of increasing the complexity of the comparison and check each bit specifically,
we remove this check completely and rely on the generic handler for spurious IRQs.

Fixes: 695e2f5c289b ("iio: adc: stm32-adc: fix a regression when using dma and irq")
Signed-off-by: Yannick Brosseau <yannick.brosseau@gmail.com>
Reviewed-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>
Link: https://lore.kernel.org/r/20220516203939.3498673-3-yannick.brosseau@gmail.com
Cc: <Stable@vger.kernel.org>
Signed-off-by: Jonathan Cameron <Jonathan.Cameron@huawei.com>
Acked-by: Takashi Iwai <tiwai@suse.de>

---
 drivers/iio/adc/stm32-adc.c | 10 ----------
 1 file changed, 10 deletions(-)

diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c
index a68ecbda6480..8c5f05f593ab 100644
--- a/drivers/iio/adc/stm32-adc.c
+++ b/drivers/iio/adc/stm32-adc.c
@@ -1407,7 +1407,6 @@ static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
 	struct stm32_adc *adc = iio_priv(indio_dev);
 	const struct stm32_adc_regspec *regs = adc->cfg->regs;
 	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
-	u32 mask = stm32_adc_readl(adc, regs->ier_eoc.reg);
 
 	/* Check ovr status right now, as ovr mask should be already disabled */
 	if (status & regs->isr_ovr.mask) {
@@ -1422,11 +1421,6 @@ static irqreturn_t stm32_adc_threaded_isr(int irq, void *data)
 		return IRQ_HANDLED;
 	}
 
-	if (!(status & mask))
-		dev_err_ratelimited(&indio_dev->dev,
-				    "Unexpected IRQ: IER=0x%08x, ISR=0x%08x\n",
-				    mask, status);
-
 	return IRQ_NONE;
 }
 
@@ -1436,10 +1430,6 @@ static irqreturn_t stm32_adc_isr(int irq, void *data)
 	struct stm32_adc *adc = iio_priv(indio_dev);
 	const struct stm32_adc_regspec *regs = adc->cfg->regs;
 	u32 status = stm32_adc_readl(adc, regs->isr_eoc.reg);
-	u32 mask = stm32_adc_readl(adc, regs->ier_eoc.reg);
-
-	if (!(status & mask))
-		return IRQ_WAKE_THREAD;
 
 	if (status & regs->isr_ovr.mask) {
 		/*
-- 
2.35.3