linux-kernel - [PATCH 1/6] media: stm32: dcmipp: bytecap: clear all interrupts upon stream stop

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Message-ID: <20251219-stm32-dcmipp-enhancements-v1-1-e2f8d46f022c@foss.st.com>
Date: Fri, 19 Dec 2025 15:30:35 +0100
From: Alain Volmat <alain.volmat@...s.st.com>
To: Hugues Fruchet <hugues.fruchet@...s.st.com>,
        Mauro Carvalho Chehab
	<mchehab@...nel.org>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        "Alexandre
 Torgue" <alexandre.torgue@...s.st.com>,
        Sakari Ailus
	<sakari.ailus@...ux.intel.com>,
        Hans Verkuil <hverkuil@...nel.org>
CC: <linux-media@...r.kernel.org>, <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
        "Alain Volmat" <alain.volmat@...s.st.com>
Subject: [PATCH 1/6] media: stm32: dcmipp: bytecap: clear all interrupts
 upon stream stop

Ensure that there are no pending interrupts after we have stopped the
pipeline. Indeed, it could happen that new interrupt has been generated
during the stop_streaming processing hence clear them in order to avoid
getting a new interrupt right from the start of a next start_streaming.

Fixes: 28e0f3772296 ("media: stm32-dcmipp: STM32 DCMIPP camera interface driver")

Signed-off-by: Alain Volmat <alain.volmat@...s.st.com>
---
 drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
index 1c1b6b48918e..b18e273ef4a3 100644
--- a/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
+++ b/drivers/media/platform/st/stm32/stm32-dcmipp/dcmipp-bytecap.c
@@ -512,6 +512,9 @@ static void dcmipp_bytecap_stop_streaming(struct vb2_queue *vq)
 	/* Disable pipe */
 	reg_clear(vcap, DCMIPP_P0FSCR, DCMIPP_P0FSCR_PIPEN);
 
+	/* Clear any pending interrupts */
+	reg_write(vcap, DCMIPP_CMFCR, DCMIPP_CMIER_P0ALL);
+
 	spin_lock_irq(&vcap->irqlock);
 
 	/* Return all queued buffers to vb2 in ERROR state */

-- 
2.34.1