[PATCH 6.12.y] media: chips-media: wave5: Add timeout while stop_streaming

[Sasha Levin <sashal@kernel.org>]

From: Jackson Lee <jackson.lee@chipsnmedia.com>

[ Upstream commit 2ae7faed2e60d6d07d9efdd962d20dcb15330ced ]

When stop_streaming is called, an infinite loop may occur in some cases.
Add a bounded poll of the queue status: loop until the queues drain,
sleeping briefly between polls, and bail out once VPU_DEC_STOP_TIMEOUT
elapses.

Fixes: 9707a6254a8a ("media: chips-media: wave5: Add the v4l2 layer")
Cc: stable@vger.kernel.org
Signed-off-by: Jackson Lee <jackson.lee@chipsnmedia.com>
Signed-off-by: Nas Chung <nas.chung@chipsnmedia.com>
Reviewed-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Nicolas Dufresne <nicolas.dufresne@collabora.com>
Signed-off-by: Hans Verkuil <hverkuil+cisco@kernel.org>
[ adapted the stop loop to use 6.12’s existing report_queue_count condition. ]
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 .../media/platform/chips-media/wave5/wave5-vpu-dec.c | 12 ++++++------
 .../platform/chips-media/wave5/wave5-vpuconfig.h     |  1 +
 2 files changed, 7 insertions(+), 6 deletions(-)

diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
index 2685ef393eaa2..1db555bc7b7db 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpu-dec.c
@@ -5,6 +5,7 @@
  * Copyright (C) 2021-2023 CHIPS&MEDIA INC
  */
 
+#include <linux/delay.h>
 #include "wave5-helper.h"
 
 #define VPU_DEC_DEV_NAME "C&M Wave5 VPU decoder"
@@ -1556,24 +1557,23 @@ static void wave5_vpu_dec_stop_streaming(struct vb2_queue *q)
 {
 	struct vpu_instance *inst = vb2_get_drv_priv(q);
 	struct v4l2_m2m_ctx *m2m_ctx = inst->v4l2_fh.m2m_ctx;
-	bool check_cmd = TRUE;
+	unsigned long timeout;
 
 	dev_dbg(inst->dev->dev, "%s: type: %u\n", __func__, q->type);
 
-	while (check_cmd) {
+	timeout = jiffies + msecs_to_jiffies(VPU_DEC_STOP_TIMEOUT);
+	while (true) {
 		struct queue_status_info q_status;
-		struct dec_output_info dec_output_info;
 
 		wave5_vpu_dec_give_command(inst, DEC_GET_QUEUE_STATUS, &q_status);
 
 		if (q_status.report_queue_count == 0)
 			break;
 
-		if (wave5_vpu_wait_interrupt(inst, VPU_DEC_TIMEOUT) < 0)
+		if (time_after(jiffies, timeout))
 			break;
 
-		if (wave5_vpu_dec_get_output_info(inst, &dec_output_info))
-			dev_dbg(inst->dev->dev, "there is no output info\n");
+		usleep_range(1000, 2000);
 	}
 
 	v4l2_m2m_update_stop_streaming_state(m2m_ctx, q);
diff --git a/drivers/media/platform/chips-media/wave5/wave5-vpuconfig.h b/drivers/media/platform/chips-media/wave5/wave5-vpuconfig.h
index e4bc2e467cb52..b63cc6bdcd88a 100644
--- a/drivers/media/platform/chips-media/wave5/wave5-vpuconfig.h
+++ b/drivers/media/platform/chips-media/wave5/wave5-vpuconfig.h
@@ -40,6 +40,7 @@
 //  application specific configuration
 #define VPU_ENC_TIMEOUT                 60000
 #define VPU_DEC_TIMEOUT                 60000
+#define VPU_DEC_STOP_TIMEOUT            300
 
 // for WAVE encoder
 #define USE_SRC_PRP_AXI         0
-- 
2.53.0