linux-kernel - [PATCH v1 5/5] media: rkvdec: Improve error handling

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Date:   Fri, 10 Jun 2022 08:52:15 -0400
From:   Nicolas Dufresne <nicolas.dufresne@...labora.com>
To:     linux-media@...r.kernel.org,
        Ezequiel Garcia <ezequiel@...guardiasur.com.ar>,
        Mauro Carvalho Chehab <mchehab@...nel.org>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Nicolas Dufresne <nicolas.dufresne@...labora.com>,
        kernel@...labora.com, linux-rockchip@...ts.infradead.org,
        linux-staging@...ts.linux.dev, linux-kernel@...r.kernel.org
Subject: [PATCH v1 5/5] media: rkvdec: Improve error handling

There is two way decode errors can occur. In one case, the ready
status is not set and nothing have been written into the destination,
while in the other case, the buffer is written but may contain a
certain amount of errors. In order to differentiate these, we set
the payload for the first case to 0.

Signed-off-by: Nicolas Dufresne <nicolas.dufresne@...labora.com>
---
 drivers/staging/media/rkvdec/rkvdec.c | 26 ++++++++++++++++++++++----
 1 file changed, 22 insertions(+), 4 deletions(-)

diff --git a/drivers/staging/media/rkvdec/rkvdec.c b/drivers/staging/media/rkvdec/rkvdec.c
index 7e76f8b72885..27f1f7276dd2 100644
--- a/drivers/staging/media/rkvdec/rkvdec.c
+++ b/drivers/staging/media/rkvdec/rkvdec.c
@@ -954,14 +954,32 @@ static irqreturn_t rkvdec_irq_handler(int irq, void *priv)
 	enum vb2_buffer_state state;
 	u32 status;
 
+	ctx = v4l2_m2m_get_curr_priv(rkvdec->m2m_dev);
 	status = readl(rkvdec->regs + RKVDEC_REG_INTERRUPT);
-	state = (status & RKVDEC_RDY_STA) ?
-		VB2_BUF_STATE_DONE : VB2_BUF_STATE_ERROR;
+
+	if (!(status & RKVDEC_RDY_STA)) {
+		struct vb2_v4l2_buffer *dst_buf = NULL;
+
+		if (status & RKVDEC_TIMEOUT_STA)
+			pr_debug("Decoder stopped due to internal timeout.");
+		else
+			pr_debug("Decoder stopped due to internal error.");
+
+		/*
+		 * When this happens, the buffer is left unmodified. As it
+		 * contains no meaningful data we mark is a empty.
+		 */
+		dst_buf = v4l2_m2m_next_dst_buf(ctx->fh.m2m_ctx);
+		vb2_set_plane_payload(&dst_buf->vb2_buf, 0, 0);
+		state = VB2_BUF_STATE_ERROR;
+	} else {
+		state = VB2_BUF_STATE_DONE;
+	}
 
 	writel(0, rkvdec->regs + RKVDEC_REG_INTERRUPT);
-	ctx = v4l2_m2m_get_curr_priv(rkvdec->m2m_dev);
 
-	if (ctx->coded_fmt_desc->ops->check_error_info)
+	if (ctx->coded_fmt_desc->ops->check_error_info &&
+	    state == VB2_BUF_STATE_DONE)
 		state = ctx->coded_fmt_desc->ops->check_error_info(ctx);
 
 	if (cancel_delayed_work(&rkvdec->watchdog_work))
-- 
2.36.1