[PATCH v2] media: imx-jpeg: Drop the first error frames

[ming.qian at oss.nxp.com]

From: Ming Qian <ming.qian at oss.nxp.com>

When an output buffer contains error frame header,
v4l2_jpeg_parse_header() will return error, then driver will mark this
buffer and a capture buffer done with error flag in device_run().

But if the error occurs in the first frames, before setup the capture
queue, there is no chance to schedule device_run(), and there may be no
capture to mark error.

So we need to drop this buffer with error flag, and make the decoding
can continue.

Fixes: 2db16c6ed72c ("media: imx-jpeg: Add V4L2 driver for i.MX8 JPEG Encoder/Decoder")
Signed-off-by: Ming Qian <ming.qian at oss.nxp.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne at collabora.com>
---
v2
- Add missed Fixes tag
- Apply Nicolas's suggestion

 drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c | 12 +++++++++++-
 1 file changed, 11 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
index 6ea4add00b3a..5c17bc58181e 100644
--- a/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
+++ b/drivers/media/platform/nxp/imx-jpeg/mxc-jpeg.c
@@ -1980,9 +1980,19 @@ static void mxc_jpeg_buf_queue(struct vb2_buffer *vb)
 	jpeg_src_buf = vb2_to_mxc_buf(vb);
 	jpeg_src_buf->jpeg_parse_error = false;
 	ret = mxc_jpeg_parse(ctx, vb);
-	if (ret)
+	if (ret) {
 		jpeg_src_buf->jpeg_parse_error = true;
 
+		/*
+		 * if the capture queue is not setup, the device_run() won't be scheduled,
+		 * need to drop the error buffer, so that the decoding can continue
+		 */
+		if (!vb2_is_streaming(v4l2_m2m_get_dst_vq(ctx->fh.m2m_ctx))) {
+			v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
+			return;
+		}
+	}
+
 end:
 	v4l2_m2m_buf_queue(ctx->fh.m2m_ctx, vbuf);
 }
-- 
2.43.0-rc1