linux-kernel - [PATCH v4 10/10] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream

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Message-Id: <20240416-enable-streams-impro-v4-10-1d370c9c2b6d@ideasonboard.com>
Date: Tue, 16 Apr 2024 13:40:09 +0300
From: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
To: Mauro Carvalho Chehab <mchehab@...nel.org>, 
 Hans Verkuil <hverkuil@...all.nl>, 
 Laurent Pinchart <laurent.pinchart@...asonboard.com>, 
 Sakari Ailus <sakari.ailus@...ux.intel.com>, 
 Umang Jain <umang.jain@...asonboard.com>
Cc: linux-media@...r.kernel.org, linux-kernel@...r.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
Subject: [PATCH v4 10/10] media: subdev: Support non-routing subdevs in
 v4l2_subdev_s_stream_helper()

At the moment v4l2_subdev_s_stream_helper() only works for subdevices
that support routing. As enable/disable_streams now also works for
subdevices without routing, improve v4l2_subdev_s_stream_helper() to do
the same.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@...asonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 23 ++++++++++++++++-------
 1 file changed, 16 insertions(+), 7 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 1c6b305839a1..83ebcde54a34 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2360,15 +2360,24 @@ int v4l2_subdev_s_stream_helper(struct v4l2_subdev *sd, int enable)
 	if (WARN_ON(pad_index == -1))
 		return -EINVAL;
 
-	/*
-	 * As there's a single source pad, just collect all the source streams.
-	 */
-	state = v4l2_subdev_lock_and_get_active_state(sd);
+	if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
+		/*
+		 * As there's a single source pad, just collect all the source
+		 * streams.
+		 */
+		state = v4l2_subdev_lock_and_get_active_state(sd);
 
-	for_each_active_route(&state->routing, route)
-		source_mask |= BIT_ULL(route->source_stream);
+		for_each_active_route(&state->routing, route)
+			source_mask |= BIT_ULL(route->source_stream);
 
-	v4l2_subdev_unlock_state(state);
+		v4l2_subdev_unlock_state(state);
+	} else {
+		/*
+		 * For non-streams subdevices, there's a single implicit stream
+		 * per pad.
+		 */
+		source_mask = BIT_ULL(1);
+	}
 
 	if (enable)
 		return v4l2_subdev_enable_streams(sd, pad_index, source_mask);

-- 
2.34.1