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From: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Date: Fri, 05 Apr 2024 12:14:26 +0300
Subject: [PATCH v2 8/9] media: subdev: Refactor
 v4l2_subdev_enable/disable_streams()
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Message-Id: <20240405-enable-streams-impro-v2-8-22bca967665d@ideasonboard.com>
References: <20240405-enable-streams-impro-v2-0-22bca967665d@ideasonboard.com>
In-Reply-To: <20240405-enable-streams-impro-v2-0-22bca967665d@ideasonboard.com>
To: Mauro Carvalho Chehab <mchehab@kernel.org>, 
 Hans Verkuil <hverkuil@xs4all.nl>, 
 Laurent Pinchart <laurent.pinchart@ideasonboard.com>, 
 Sakari Ailus <sakari.ailus@linux.intel.com>, 
 Umang Jain <umang.jain@ideasonboard.com>
Cc: linux-media@vger.kernel.org, linux-kernel@vger.kernel.org, 
 Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>

Add two internal helper functions, v4l2_subdev_collect_streams() and
v4l2_subdev_set_streams_enabled(), which allows us to refactor
v4l2_subdev_enable/disable_streams() functions.

This (I think) makes the code a bit easier to read, and lets us more
easily add new functionality in the helper functions in the following
patch.

Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
 drivers/media/v4l2-core/v4l2-subdev.c | 111 +++++++++++++++++++---------------
 1 file changed, 62 insertions(+), 49 deletions(-)

diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 015f2fb423c9..6c3c9069f1e2 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2099,6 +2099,44 @@ int v4l2_subdev_routing_validate(struct v4l2_subdev *sd,
 }
 EXPORT_SYMBOL_GPL(v4l2_subdev_routing_validate);
 
+static void v4l2_subdev_collect_streams(struct v4l2_subdev *sd,
+					struct v4l2_subdev_state *state,
+					u32 pad, u64 streams_mask,
+					u64 *found_streams,
+					u64 *enabled_streams)
+{
+	*found_streams = 0;
+	*enabled_streams = 0;
+
+	for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
+		const struct v4l2_subdev_stream_config *cfg;
+
+		cfg = &state->stream_configs.configs[i];
+
+		if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
+			continue;
+
+		*found_streams |= BIT_ULL(cfg->stream);
+		if (cfg->enabled)
+			*enabled_streams |= BIT_ULL(cfg->stream);
+	}
+}
+
+static void v4l2_subdev_set_streams_enabled(struct v4l2_subdev *sd,
+					    struct v4l2_subdev_state *state,
+					    u32 pad, u64 streams_mask,
+					    bool enabled)
+{
+	for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
+		struct v4l2_subdev_stream_config *cfg;
+
+		cfg = &state->stream_configs.configs[i];
+
+		if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
+			cfg->enabled = enabled;
+	}
+}
+
 static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
 					       u64 streams_mask)
 {
@@ -2150,8 +2188,8 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 	struct device *dev = sd->entity.graph_obj.mdev->dev;
 	struct v4l2_subdev_state *state;
 	bool already_streaming;
-	u64 found_streams = 0;
-	unsigned int i;
+	u64 enabled_streams;
+	u64 found_streams;
 	int ret;
 
 	/* A few basic sanity checks first. */
@@ -2172,22 +2210,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 	 * Verify that the requested streams exist and that they are not
 	 * already enabled.
 	 */
-	for (i = 0; i < state->stream_configs.num_configs; ++i) {
-		struct v4l2_subdev_stream_config *cfg =
-			&state->stream_configs.configs[i];
 
-		if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
-			continue;
-
-		found_streams |= BIT_ULL(cfg->stream);
-
-		if (cfg->enabled) {
-			dev_dbg(dev, "stream %u already enabled on %s:%u\n",
-				cfg->stream, sd->entity.name, pad);
-			ret = -EALREADY;
-			goto done;
-		}
-	}
+	v4l2_subdev_collect_streams(sd, state, pad, streams_mask,
+				    &found_streams, &enabled_streams);
 
 	if (found_streams != streams_mask) {
 		dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
@@ -2196,6 +2221,13 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 		goto done;
 	}
 
+	if (enabled_streams) {
+		dev_dbg(dev, "streams 0x%llx already enabled on %s:%u\n",
+			enabled_streams, sd->entity.name, pad);
+		ret = -EINVAL;
+		goto done;
+	}
+
 	dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
 
 	already_streaming = v4l2_subdev_is_streaming(sd);
@@ -2213,13 +2245,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
 	}
 
 	/* Mark the streams as enabled. */
-	for (i = 0; i < state->stream_configs.num_configs; ++i) {
-		struct v4l2_subdev_stream_config *cfg =
-			&state->stream_configs.configs[i];
-
-		if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
-			cfg->enabled = true;
-	}
+	v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, true);
 
 done:
 	if (ret && !already_streaming)
@@ -2281,8 +2307,8 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
 {
 	struct device *dev = sd->entity.graph_obj.mdev->dev;
 	struct v4l2_subdev_state *state;
-	u64 found_streams = 0;
-	unsigned int i;
+	u64 enabled_streams;
+	u64 found_streams;
 	int ret;
 
 	/* A few basic sanity checks first. */
@@ -2303,22 +2329,9 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
 	 * Verify that the requested streams exist and that they are not
 	 * already disabled.
 	 */
-	for (i = 0; i < state->stream_configs.num_configs; ++i) {
-		struct v4l2_subdev_stream_config *cfg =
-			&state->stream_configs.configs[i];
 
-		if (cfg->pad != pad || !(streams_mask & BIT_ULL(cfg->stream)))
-			continue;
-
-		found_streams |= BIT_ULL(cfg->stream);
-
-		if (!cfg->enabled) {
-			dev_dbg(dev, "stream %u already disabled on %s:%u\n",
-				cfg->stream, sd->entity.name, pad);
-			ret = -EALREADY;
-			goto done;
-		}
-	}
+	v4l2_subdev_collect_streams(sd, state, pad, streams_mask,
+				    &found_streams, &enabled_streams);
 
 	if (found_streams != streams_mask) {
 		dev_dbg(dev, "streams 0x%llx not found on %s:%u\n",
@@ -2327,6 +2340,13 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
 		goto done;
 	}
 
+	if (enabled_streams != streams_mask) {
+		dev_dbg(dev, "streams 0x%llx already disabled on %s:%u\n",
+			streams_mask & ~enabled_streams, sd->entity.name, pad);
+		ret = -EINVAL;
+		goto done;
+	}
+
 	dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
 
 	/* Call the .disable_streams() operation. */
@@ -2338,14 +2358,7 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
 		goto done;
 	}
 
-	/* Mark the streams as disabled. */
-	for (i = 0; i < state->stream_configs.num_configs; ++i) {
-		struct v4l2_subdev_stream_config *cfg =
-			&state->stream_configs.configs[i];
-
-		if (cfg->pad == pad && (streams_mask & BIT_ULL(cfg->stream)))
-			cfg->enabled = false;
-	}
+	v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, false);
 
 done:
 	if (!v4l2_subdev_is_streaming(sd))

-- 
2.34.1