linux-kernel - [PATCH AUTOSEL 5.15 02/46] media: imx-jpeg: Disable useless interrupt to avoid kernel panic

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Message-Id: <20221218161244.930785-2-sashal@kernel.org>
Date:   Sun, 18 Dec 2022 11:12:00 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
Cc:     Ming Qian <ming.qian@....com>,
        Mirela Rabulea <mirela.rabulea@....com>,
        Hans Verkuil <hverkuil-cisco@...all.nl>,
        Sasha Levin <sashal@...nel.org>, mchehab@...nel.org,
        shawnguo@...nel.org, laurent.pinchart@...asonboard.com,
        linux-media@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH AUTOSEL 5.15 02/46] media: imx-jpeg: Disable useless interrupt to avoid kernel panic

From: Ming Qian <ming.qian@....com>

[ Upstream commit c3720e65c9013a7b2a5dbb63e6bf6d74a35dd894 ]

There is a hardware bug that the interrupt STMBUF_HALF may be triggered
after or when disable interrupt.
It may led to unexpected kernel panic.
And interrupt STMBUF_HALF and STMBUF_RTND have no other effect.
So disable them and the unused interrupts.

meanwhile clear the interrupt status when disable interrupt.

Signed-off-by: Ming Qian <ming.qian@....com>
Reviewed-by: Mirela Rabulea <mirela.rabulea@....com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@...all.nl>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
index 718b7b08f93e..8936d5ce886c 100644
--- a/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
+++ b/drivers/media/platform/imx-jpeg/mxc-jpeg-hw.c
@@ -76,12 +76,14 @@ void print_wrapper_info(struct device *dev, void __iomem *reg)
 
 void mxc_jpeg_enable_irq(void __iomem *reg, int slot)
 {
-	writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_IRQ_EN));
+	writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
+	writel(0xF0C, reg + MXC_SLOT_OFFSET(slot, SLOT_IRQ_EN));
 }
 
 void mxc_jpeg_disable_irq(void __iomem *reg, int slot)
 {
 	writel(0x0, reg + MXC_SLOT_OFFSET(slot, SLOT_IRQ_EN));
+	writel(0xFFFFFFFF, reg + MXC_SLOT_OFFSET(slot, SLOT_STATUS));
 }
 
 void mxc_jpeg_sw_reset(void __iomem *reg)
-- 
2.35.1