linux-kernel - [PATCH v4 2/3] media: amphion: Clear last_buffer_dequeued flag for DEC_CMD

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Message-ID: <20251217030227.1546-3-ming.qian@oss.nxp.com>
Date: Wed, 17 Dec 2025 11:02:22 +0800
From: ming.qian@....nxp.com
To: linux-media@...r.kernel.org
Cc: mchehab@...nel.org,
	hverkuil-cisco@...all.nl,
	nicolas@...fresne.ca,
	sebastian.fricke@...labora.com,
	shawnguo@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	linux-imx@....com,
	Frank.li@....com,
	xiahong.bao@....com,
	eagle.zhou@....com,
	imx@...ts.linux.dev,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v4 2/3] media: amphion: Clear last_buffer_dequeued flag for DEC_CMD_START

From: Ming Qian <ming.qian@....nxp.com>

The V4L2_DEC_CMD_START command may be used to handle the dynamic source
change, which will triggers an implicit decoder drain.
The last_buffer_dequeued flag is set in the implicit decoder drain,
so driver need to clear it to continue the following decoding flow.

Signed-off-by: Ming Qian <ming.qian@....nxp.com>
---
 drivers/media/platform/amphion/vdec.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/media/platform/amphion/vdec.c b/drivers/media/platform/amphion/vdec.c
index c0d2aabb9e0e..f25dbcebdccf 100644
--- a/drivers/media/platform/amphion/vdec.c
+++ b/drivers/media/platform/amphion/vdec.c
@@ -724,6 +724,7 @@ static int vdec_decoder_cmd(struct file *file, void *fh, struct v4l2_decoder_cmd
 	switch (cmd->cmd) {
 	case V4L2_DEC_CMD_START:
 		vdec_cmd_start(inst);
+		vb2_clear_last_buffer_dequeued(v4l2_m2m_get_dst_vq(inst->fh.m2m_ctx));
 		break;
 	case V4L2_DEC_CMD_STOP:
 		vdec_cmd_stop(inst);
-- 
2.52.0