media: platform: Add mechanism to handle jpeg hardware's locking up

There is a delayed work scheduled before starting the hardware and
canceled in the interrupt handler. If the delayed work is executed, it
resets the hardware and reports the failure to V4L2, so that the
execution can continue from next frames.
Reviewed-by: Tomasz Figa <tfiga@chromium.org>
Signed-off-by: Xia Jiang <xia.jiang@mediatek.com>
Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl>
Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@kernel.org>

drivers/media/platform/mtk-jpeg/mtk_jpeg_core.c

@@ -816,6 +816,9 @@ static void mtk_jpeg_device_run(void *priv)
 	if (ret < 0)
 		goto dec_end;
 
+	schedule_delayed_work(&jpeg->job_timeout_work,
+			      msecs_to_jiffies(MTK_JPEG_HW_TIMEOUT_MSEC));
+
 	mtk_jpeg_set_dec_src(ctx, &src_buf->vb2_buf, &bs);
 	if (mtk_jpeg_set_dec_dst(ctx, &jpeg_src_buf->dec_param, &dst_buf->vb2_buf, &fb))
 		goto dec_end;
@@ -911,6 +914,8 @@ static irqreturn_t mtk_jpeg_dec_irq(int irq, void *priv)
 	u32 dec_ret;
 	int i;
 
+	cancel_delayed_work(&jpeg->job_timeout_work);
+
 	dec_ret = mtk_jpeg_dec_get_int_status(jpeg->dec_reg_base);
 	dec_irq_ret = mtk_jpeg_dec_enum_result(dec_ret);
 	ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
@@ -1066,6 +1071,25 @@ static int mtk_jpeg_clk_init(struct mtk_jpeg_dev *jpeg)
 	return PTR_ERR_OR_ZERO(jpeg->clk_jdec_smi);
 }
 
+static void mtk_jpeg_job_timeout_work(struct work_struct *work)
+{
+	struct mtk_jpeg_dev *jpeg = container_of(work, struct mtk_jpeg_dev,
+						 job_timeout_work.work);
+	struct mtk_jpeg_ctx *ctx;
+	struct vb2_v4l2_buffer *src_buf, *dst_buf;
+
+	ctx = v4l2_m2m_get_curr_priv(jpeg->m2m_dev);
+	src_buf = v4l2_m2m_src_buf_remove(ctx->fh.m2m_ctx);
+	dst_buf = v4l2_m2m_dst_buf_remove(ctx->fh.m2m_ctx);
+
+	mtk_jpeg_dec_reset(jpeg->dec_reg_base);
+
+	pm_runtime_put(jpeg->dev);
+
+	v4l2_m2m_buf_done(src_buf, VB2_BUF_STATE_ERROR);
+	v4l2_m2m_buf_done(dst_buf, VB2_BUF_STATE_ERROR);
+	v4l2_m2m_job_finish(jpeg->m2m_dev, ctx->fh.m2m_ctx);
+}
 static int mtk_jpeg_probe(struct platform_device *pdev)
 {
 	struct mtk_jpeg_dev *jpeg;
@@ -1080,6 +1104,7 @@ static int mtk_jpeg_probe(struct platform_device *pdev)
 	mutex_init(&jpeg->lock);
 	spin_lock_init(&jpeg->hw_lock);
 	jpeg->dev = &pdev->dev;
+	INIT_DELAYED_WORK(&jpeg->job_timeout_work, mtk_jpeg_job_timeout_work);
 
 	res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
 	jpeg->dec_reg_base = devm_ioremap_resource(&pdev->dev, res);

drivers/media/platform/mtk-jpeg/mtk_jpeg_core.h

@@ -28,6 +28,8 @@
 
 #define MTK_JPEG_DEFAULT_SIZEIMAGE	(1 * 1024 * 1024)
 
+#define MTK_JPEG_HW_TIMEOUT_MSEC 1000
+
 enum mtk_jpeg_ctx_state {
 	MTK_JPEG_INIT = 0,
 	MTK_JPEG_RUNNING,
@@ -48,6 +50,7 @@ enum mtk_jpeg_ctx_state {
  * @clk_jdec:		JPEG hw working clock
  * @clk_jdec_smi:	JPEG SMI bus clock
  * @larb:		SMI device
+ * @job_timeout_work:	IRQ timeout structure
  */
 struct mtk_jpeg_dev {
 	struct mutex		lock;
@@ -62,6 +65,7 @@ struct mtk_jpeg_dev {
 	struct clk		*clk_jdec;
 	struct clk		*clk_jdec_smi;
 	struct device		*larb;
+	struct delayed_work job_timeout_work;
 };
 
 /**