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

[Ming Qian]

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 at nxp.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