linux-kernel - [PATCH] media: meson: vdec: esparser: check parsing state with hardware write pointer

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Date:   Mon, 23 Jan 2023 09:43:00 +0000
From:   Christian Hewitt <christianshewitt@...il.com>
To:     Neil Armstrong <neil.armstrong@...aro.org>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Kevin Hilman <khilman@...libre.com>,
        Jerome Brunet <jbrunet@...libre.com>,
        Martin Blumenstingl <martin.blumenstingl@...glemail.com>,
        linux-media@...r.kernel.org, linux-amlogic@...ts.infradead.org,
        linux-staging@...ts.linux.dev,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Cc:     Christian Hewitt <christianshewitt@...il.com>,
        Neil Armstrong <narmstrong@...libre.com>
Subject: [PATCH] media: meson: vdec: esparser: check parsing state with hardware write pointer

From: Neil Armstrong <narmstrong@...libre.com>

Also check the hardware write pointer to check if ES Parser has stalled.

Signed-off-by: Neil Armstrong <narmstrong@...libre.com>
Signed-off-by: Christian Hewitt <christianshewitt@...il.com>
---
 drivers/staging/media/meson/vdec/esparser.c | 15 +++++++++++----
 1 file changed, 11 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/meson/vdec/esparser.c b/drivers/staging/media/meson/vdec/esparser.c
index df5956c6141d..41b705f999b2 100644
--- a/drivers/staging/media/meson/vdec/esparser.c
+++ b/drivers/staging/media/meson/vdec/esparser.c
@@ -300,6 +300,7 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
 	u32 num_dst_bufs = 0;
 	u32 offset;
 	u32 pad_size;
+	u32 wp, wp2;
 
 	/*
 	 * When max ref frame is held by VP9, this should be -= 3 to prevent a
@@ -354,15 +355,21 @@ esparser_queue(struct amvdec_session *sess, struct vb2_v4l2_buffer *vbuf)
 	}
 
 	pad_size = esparser_pad_start_code(core, vb, payload_size);
+	wp = amvdec_read_parser(core, PARSER_VIDEO_WP);
 	ret = esparser_write_data(core, phy, payload_size + pad_size);
+	wp2 = amvdec_read_parser(core, PARSER_VIDEO_WP);
 
 	if (ret <= 0) {
-		dev_warn(core->dev, "esparser: input parsing error\n");
-		amvdec_remove_ts(sess, vb->timestamp);
-		v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
 		amvdec_write_parser(core, PARSER_FETCH_CMD, 0);
 
-		return 0;
+		if (ret < 0 || wp2 == wp) {
+			dev_err(core->dev, "esparser: input parsing error ret %d (%x <=> %x)\n",
+				ret, wp, wp2);
+			amvdec_remove_ts(sess, vb->timestamp);
+			v4l2_m2m_buf_done(vbuf, VB2_BUF_STATE_ERROR);
+
+			return 0;
+		}
 	}
 
 	atomic_inc(&sess->esparser_queued_bufs);
-- 
2.34.1