linux-kernel - [PATCH v2 2/2] media: amphion: Add a frame flush mode for decoder

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Message-ID: <20250117075720.4018076-2-ming.qian@oss.nxp.com>
Date: Fri, 17 Jan 2025 16:57:20 +0900
From: Ming Qian <ming.qian@....nxp.com>
To: mchehab@...nel.org,
	hverkuil-cisco@...all.nl
Cc: nicolas@...fresne.ca,
	shawnguo@...nel.org,
	robh+dt@...nel.org,
	s.hauer@...gutronix.de,
	kernel@...gutronix.de,
	festevam@...il.com,
	linux-imx@....com,
	xiahong.bao@....com,
	eagle.zhou@....com,
	tao.jiang_2@....com,
	ming.qian@....nxp.com,
	imx@...ts.linux.dev,
	linux-media@...r.kernel.org,
	linux-kernel@...r.kernel.org,
	linux-arm-kernel@...ts.infradead.org
Subject: [PATCH v2 2/2] media: amphion: Add a frame flush mode for decoder

The amphion decoder will pre-parse 3 frames before decoding the first
frame. If we append a flush padding data after frame, the decoder
will finish parsing and start to decode when the flush data is parsed.
It can reduce the decoding latency.
In the past, we only enable this mode when the display delay is set to
0. But we still can enable this mode without changing the display order,
so we add a frame_flush_mode parameter to enable it.

Signed-off-by: Ming Qian <ming.qian@....nxp.com>
---
 drivers/media/platform/amphion/vpu_malone.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/media/platform/amphion/vpu_malone.c b/drivers/media/platform/amphion/vpu_malone.c
index 1d9e10d9bec1..f07660dc3b07 100644
--- a/drivers/media/platform/amphion/vpu_malone.c
+++ b/drivers/media/platform/amphion/vpu_malone.c
@@ -25,6 +25,9 @@
 #include "vpu_imx8q.h"
 #include "vpu_malone.h"
 
+static bool frame_flush_mode;
+module_param(frame_flush_mode, bool, 0644);
+
 #define CMD_SIZE			25600
 #define MSG_SIZE			25600
 #define CODEC_SIZE			0x1000
@@ -1579,7 +1582,7 @@ static int vpu_malone_input_frame_data(struct vpu_malone_str_buffer __iomem *str
 
 	vpu_malone_update_wptr(str_buf, wptr);
 
-	if (disp_imm && !vpu_vb_is_codecconfig(vbuf)) {
+	if ((disp_imm || frame_flush_mode) && !vpu_vb_is_codecconfig(vbuf)) {
 		ret = vpu_malone_add_scode(inst->core->iface,
 					   inst->id,
 					   &inst->stream_buffer,
-- 
2.43.0-rc1