linux-kernel - [PATCH v4 08/10] media: imx-jpeg: Clear slot next desc ptr if config error

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Date:   Tue, 14 Mar 2023 18:08:51 +0800
From:   Ming Qian <ming.qian@....com>
To:     mchehab@...nel.org, mirela.rabulea@....nxp.com,
        hverkuil-cisco@...all.nl
Cc:     shawnguo@...nel.org, s.hauer@...gutronix.de, kernel@...gutronix.de,
        festevam@...il.com, xiahong.bao@....com, linux-imx@....com,
        linux-media@...r.kernel.org, linux-kernel@...r.kernel.org,
        devicetree@...r.kernel.org, linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 08/10] media: imx-jpeg: Clear slot next desc ptr if config error

clear slot next desc ptr if config error,
otherwise codec will report config error interrupt repeatedly,
it may led to system hang.

Signed-off-by: Ming Qian <ming.qian@....com>
---
 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c | 5 +++++
 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h | 1 +
 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c    | 1 +
 3 files changed, 7 insertions(+)

diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c
index ef28122a5ed4..bbd5d6a9fc86 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.c
@@ -178,3 +178,8 @@ void mxc_jpeg_set_desc(u32 desc, void __iomem *reg, int slot)
 	writel(desc | MXC_NXT_DESCPT_EN,
 	       reg + MXC_SLOT_OFFSET(slot, SLOT_NXT_DESCPT_PTR));
 }
+
+void mxc_jpeg_clr_desc(void __iomem *reg, int slot)
+{
+	writel(0, reg + MXC_SLOT_OFFSET(slot, SLOT_NXT_DESCPT_PTR));
+}
diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h
index ecf3b6562ba2..8b7cd6526efd 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg-hw.h
@@ -137,6 +137,7 @@ void mxc_jpeg_set_bufsize(struct mxc_jpeg_desc *desc,  u32 bufsize);
 void mxc_jpeg_set_res(struct mxc_jpeg_desc *desc, u16 w, u16 h);
 void mxc_jpeg_set_line_pitch(struct mxc_jpeg_desc *desc, u32 line_pitch);
 void mxc_jpeg_set_desc(u32 desc, void __iomem *reg, int slot);
+void mxc_jpeg_clr_desc(void __iomem *reg, int slot);
 void mxc_jpeg_set_regs_from_desc(struct mxc_jpeg_desc *desc,
 				 void __iomem *reg);
 #endif
diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
index 70b6eea733e7..3f1c9bc4b144 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
@@ -692,6 +692,7 @@ static irqreturn_t mxc_jpeg_dec_irq(int irq, void *priv)
 		u32 ret = readl(reg + CAST_STATUS12);
 
 		dev_err(dev, "Encoder/decoder error, status=0x%08x", ret);
+		mxc_jpeg_clr_desc(reg, slot);
 		mxc_jpeg_sw_reset(reg);
 		buf_state = VB2_BUF_STATE_ERROR;
 		goto buffers_done;
-- 
2.38.1