* [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery
@ 2024-04-24 15:39 Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 01/11] media: subdev: Add privacy led helpers Tomi Valkeinen
` (10 more replies)
0 siblings, 11 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
This series works on the .s_stream, .enable_streams, .disable_streams
related code. The main feature introduced here, in the last two patchs,
is adding support for .enable/disable_streams() for subdevs that do not
implement full streams support.
Additionally we add support for the privacy led when
v4l2_subdev_enable/disable_streams() is used.
I have tested this on RPi5.
Tomi
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
Changes in v6:
- v4l2_subdev_enable_streams() and v4l2_subdev_disable_streams()
accidentally returned -EINVAL when a stream was already
enabled/disabled. Change it back to -EALREADY.
- Add TODO note about privacy leds to "media: subdev: Support
single-stream case in v4l2_subdev_enable/disable_streams()"
- New commit "media: subdev: Improve s_stream documentation"
- Link to v5: https://lore.kernel.org/r/20240416-enable-streams-impro-v5-0-bd5fcea49388@ideasonboard.com
Changes in v5:
- Fix issues with non-routing case:
- Always set 'found_streams' variable instead of leaving it
uninitialized in "Support single-stream case in
v4l2_subdev_enable/disable_streams()"
- Fix the "implicit" stream from bit 1 to bit 0 in "Support
non-routing subdevs in v4l2_subdev_s_stream_helper()"
- Link to v4: https://lore.kernel.org/r/20240416-enable-streams-impro-v4-0-1d370c9c2b6d@ideasonboard.com
Changes in v4:
- Added Rb tags
- Rename 'streaming_enabled' to 's_stream_enabled'
- Cosmetic changes (comments / patch descs)
- Added new patch "media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper()".
- Link to v3: https://lore.kernel.org/r/20240410-enable-streams-impro-v3-0-e5e7a5da7420@ideasonboard.com
Changes in v3:
- Rebased on top of "[PATCH v2 1/1] media: v4l: Don't turn on privacy LED if streamon fails"
- Drop extra "!!" in "media: subdev: Fix use of sd->enabled_streams in call_s_stream()"
- Enable privacy LED after a succesfull stream enable in "media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams()"
- Init 'cfg' variable when declaring in "media: subdev: Refactor v4l2_subdev_enable/disable_streams()"
- Link to v2: https://lore.kernel.org/r/20240405-enable-streams-impro-v2-0-22bca967665d@ideasonboard.com
Changes in v2:
- New patches for privacy led
- Use v4l2_subdev_has_op()
- Use BITS_PER_BYTE instead of 8
- Fix 80+ line issues
- Fix typos
- Check for pad < 64 also in the non-routing .enable/disable_streams code path
- Dropped "media: subdev: Support enable/disable_streams for non-streams
subdevs", which is implemented in a different way in new patches in this series
- Link to v1: https://lore.kernel.org/r/20240404-enable-streams-impro-v1-0-1017a35bbe07@ideasonboard.com
---
Tomi Valkeinen (11):
media: subdev: Add privacy led helpers
media: subdev: Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams()
media: subdev: Add checks for subdev features
media: subdev: Fix use of sd->enabled_streams in call_s_stream()
media: subdev: Improve v4l2_subdev_enable/disable_streams_fallback
media: subdev: Add v4l2_subdev_is_streaming()
media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams()
media: subdev: Refactor v4l2_subdev_enable/disable_streams()
media: subdev: Support single-stream case in v4l2_subdev_enable/disable_streams()
media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper()
media: subdev: Improve s_stream documentation
drivers/media/v4l2-core/v4l2-subdev.c | 385 ++++++++++++++++++++--------------
include/media/v4l2-subdev.h | 34 ++-
2 files changed, 261 insertions(+), 158 deletions(-)
---
base-commit: e42a204f0519a2540f1507ac2798be2aeaa76bee
change-id: 20240404-enable-streams-impro-db8bcd898471
Best regards,
--
Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
^ permalink raw reply [flat|nested] 15+ messages in thread
* [PATCH v6 01/11] media: subdev: Add privacy led helpers
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 02/11] media: subdev: Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
` (9 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
Add helper functions to enable and disable the privacy led. This moves
the #if from the call site to the privacy led functions, and makes
adding privacy led support to v4l2_subdev_enable/disable_streams()
cleaner.
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 30 +++++++++++++++++++++---------
1 file changed, 21 insertions(+), 9 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 2d67ec54569a..b4f0b89412eb 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -148,6 +148,23 @@ static int subdev_close(struct file *file)
}
#endif /* CONFIG_VIDEO_V4L2_SUBDEV_API */
+static void v4l2_subdev_enable_privacy_led(struct v4l2_subdev *sd)
+{
+#if IS_REACHABLE(CONFIG_LEDS_CLASS)
+ if (!IS_ERR_OR_NULL(sd->privacy_led))
+ led_set_brightness(sd->privacy_led,
+ sd->privacy_led->max_brightness);
+#endif
+}
+
+static void v4l2_subdev_disable_privacy_led(struct v4l2_subdev *sd)
+{
+#if IS_REACHABLE(CONFIG_LEDS_CLASS)
+ if (!IS_ERR_OR_NULL(sd->privacy_led))
+ led_set_brightness(sd->privacy_led, 0);
+#endif
+}
+
static inline int check_which(u32 which)
{
if (which != V4L2_SUBDEV_FORMAT_TRY &&
@@ -452,15 +469,10 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
if (!ret) {
sd->enabled_streams = enable ? BIT(0) : 0;
-#if IS_REACHABLE(CONFIG_LEDS_CLASS)
- if (!IS_ERR_OR_NULL(sd->privacy_led)) {
- if (enable)
- led_set_brightness(sd->privacy_led,
- sd->privacy_led->max_brightness);
- else
- led_set_brightness(sd->privacy_led, 0);
- }
-#endif
+ if (enable)
+ v4l2_subdev_enable_privacy_led(sd);
+ else
+ v4l2_subdev_disable_privacy_led(sd);
}
return ret;
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 02/11] media: subdev: Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 01/11] media: subdev: Add privacy led helpers Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 03/11] media: subdev: Add checks for subdev features Tomi Valkeinen
` (8 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams() instead
of open coding the same.
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index b4f0b89412eb..2c5a9b0029dc 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2168,7 +2168,7 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
return 0;
/* Fallback on .s_stream() if .enable_streams() isn't available. */
- if (!sd->ops->pad || !sd->ops->pad->enable_streams)
+ if (!v4l2_subdev_has_op(sd, pad, enable_streams))
return v4l2_subdev_enable_streams_fallback(sd, pad,
streams_mask);
@@ -2285,7 +2285,7 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
return 0;
/* Fallback on .s_stream() if .disable_streams() isn't available. */
- if (!sd->ops->pad || !sd->ops->pad->disable_streams)
+ if (!v4l2_subdev_has_op(sd, pad, disable_streams))
return v4l2_subdev_disable_streams_fallback(sd, pad,
streams_mask);
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 03/11] media: subdev: Add checks for subdev features
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 01/11] media: subdev: Add privacy led helpers Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 02/11] media: subdev: Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 04/11] media: subdev: Fix use of sd->enabled_streams in call_s_stream() Tomi Valkeinen
` (7 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
Add some checks to verify that the subdev driver implements required
features.
A subdevice that supports streams (V4L2_SUBDEV_FL_STREAMS) must do one
of the following:
- Implement neither .enable/disable_streams() nor .s_stream(), if the
subdev is part of a video driver that uses an internal method to
enable the subdev.
- Implement only .enable/disable_streams(), if support for legacy
sink-side subdevices is not needed.
- Implement .enable/disable_streams() and .s_stream(), if support for
legacy sink-side subdevices is needed.
At the moment the framework doesn't check this requirement. Add the
check.
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 27 +++++++++++++++++++++++++++
1 file changed, 27 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 2c5a9b0029dc..b67456944ae1 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -1568,6 +1568,33 @@ int __v4l2_subdev_init_finalize(struct v4l2_subdev *sd, const char *name,
struct lock_class_key *key)
{
struct v4l2_subdev_state *state;
+ struct device *dev = sd->dev;
+ bool has_disable_streams;
+ bool has_enable_streams;
+ bool has_s_stream;
+
+ /* Check that the subdevice implements the required features */
+
+ has_s_stream = v4l2_subdev_has_op(sd, video, s_stream);
+ has_enable_streams = v4l2_subdev_has_op(sd, pad, enable_streams);
+ has_disable_streams = v4l2_subdev_has_op(sd, pad, disable_streams);
+
+ if (has_enable_streams != has_disable_streams) {
+ dev_err(dev,
+ "subdev '%s' must implement both or neither of .enable_streams() and .disable_streams()\n",
+ sd->name);
+ return -EINVAL;
+ }
+
+ if (sd->flags & V4L2_SUBDEV_FL_STREAMS) {
+ if (has_s_stream && !has_enable_streams) {
+ dev_err(dev,
+ "subdev '%s' must implement .enable/disable_streams()\n",
+ sd->name);
+
+ return -EINVAL;
+ }
+ }
state = __v4l2_subdev_state_alloc(sd, name, key);
if (IS_ERR(state))
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 04/11] media: subdev: Fix use of sd->enabled_streams in call_s_stream()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (2 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 03/11] media: subdev: Add checks for subdev features Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 05/11] media: subdev: Improve v4l2_subdev_enable/disable_streams_fallback Tomi Valkeinen
` (6 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
call_s_stream() uses sd->enabled_streams to track whether streaming has
already been enabled. However,
v4l2_subdev_enable/disable_streams_fallback(), which was the original
user of this field, already uses it, and
v4l2_subdev_enable/disable_streams_fallback() will call call_s_stream().
This leads to a conflict as both functions set the field. Afaics, both
functions set the field to the same value, so it won't cause a runtime
bug, but it's still wrong and if we, e.g., change how
v4l2_subdev_enable/disable_streams_fallback() operates we might easily
cause bugs.
Fix this by adding a new field, 's_stream_enabled', for
call_s_stream().
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 8 ++------
include/media/v4l2-subdev.h | 3 +++
2 files changed, 5 insertions(+), 6 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index b67456944ae1..6bc983973d3b 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -451,12 +451,8 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
* The .s_stream() operation must never be called to start or stop an
* already started or stopped subdev. Catch offenders but don't return
* an error yet to avoid regressions.
- *
- * As .s_stream() is mutually exclusive with the .enable_streams() and
- * .disable_streams() operation, we can use the enabled_streams field
- * to store the subdev streaming state.
*/
- if (WARN_ON(!!sd->enabled_streams == !!enable))
+ if (WARN_ON(sd->s_stream_enabled == !!enable))
return 0;
ret = sd->ops->video->s_stream(sd, enable);
@@ -467,7 +463,7 @@ static int call_s_stream(struct v4l2_subdev *sd, int enable)
}
if (!ret) {
- sd->enabled_streams = enable ? BIT(0) : 0;
+ sd->s_stream_enabled = enable;
if (enable)
v4l2_subdev_enable_privacy_led(sd);
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 1af16b16f0bf..dccf693c680e 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1043,6 +1043,8 @@ struct v4l2_subdev_platform_data {
* v4l2_subdev_enable_streams() and
* v4l2_subdev_disable_streams() helper functions for fallback
* cases.
+ * @s_stream_enabled: Tracks whether streaming has been enabled with s_stream.
+ * This is only for call_s_stream() internal use.
*
* Each instance of a subdev driver should create this struct, either
* stand-alone or embedded in a larger struct.
@@ -1091,6 +1093,7 @@ struct v4l2_subdev {
*/
struct v4l2_subdev_state *active_state;
u64 enabled_streams;
+ bool s_stream_enabled;
};
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 05/11] media: subdev: Improve v4l2_subdev_enable/disable_streams_fallback
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (3 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 04/11] media: subdev: Fix use of sd->enabled_streams in call_s_stream() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 06/11] media: subdev: Add v4l2_subdev_is_streaming() Tomi Valkeinen
` (5 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
v4l2_subdev_enable/disable_streams_fallback() supports falling back to
.s_stream() for subdevs with a single source pad. It also tracks the
enabled streams for that one pad in the sd->enabled_streams field.
Tracking the enabled streams with sd->enabled_streams does not make
sense, as with .s_stream() there can only be a single stream per pad.
Thus, as the v4l2_subdev_enable/disable_streams_fallback() only supports
a single source pad, all we really need is a boolean which tells whether
streaming has been enabled on this pad or not.
However, as we only need a true/false state for a pad (instead of
tracking which streams have been enabled for a pad), we can easily
extend the fallback mechanism to support multiple source pads as we only
need to keep track of which pads have been enabled.
Change the sd->enabled_streams field to sd->enabled_pads, which is a
64-bit bitmask tracking the enabled source pads. With this change we can
remove the restriction that
v4l2_subdev_enable/disable_streams_fallback() only supports a single
source pad.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 68 ++++++++++++++++++++---------------
include/media/v4l2-subdev.h | 9 +++--
2 files changed, 44 insertions(+), 33 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 6bc983973d3b..3fe3de5abead 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2139,37 +2139,43 @@ static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
- unsigned int i;
int ret;
/*
* The subdev doesn't implement pad-based stream enable, fall back
- * on the .s_stream() operation. This can only be done for subdevs that
- * have a single source pad, as sd->enabled_streams is global to the
- * subdev.
+ * to the .s_stream() operation.
*/
if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
return -EOPNOTSUPP;
- for (i = 0; i < sd->entity.num_pads; ++i) {
- if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
- return -EOPNOTSUPP;
- }
+ /*
+ * .s_stream() means there is no streams support, so the only allowed
+ * stream is the implicit stream 0.
+ */
+ if (streams_mask != BIT_ULL(0))
+ return -EOPNOTSUPP;
+
+ /*
+ * We use a 64-bit bitmask for tracking enabled pads, so only subdevices
+ * with 64 pads or less can be supported.
+ */
+ if (pad >= sizeof(sd->enabled_pads) * BITS_PER_BYTE)
+ return -EOPNOTSUPP;
- if (sd->enabled_streams & streams_mask) {
- dev_dbg(dev, "set of streams %#llx already enabled on %s:%u\n",
- streams_mask, sd->entity.name, pad);
+ if (sd->enabled_pads & BIT_ULL(pad)) {
+ dev_dbg(dev, "pad %u already enabled on %s\n",
+ pad, sd->entity.name);
return -EALREADY;
}
- /* Start streaming when the first streams are enabled. */
- if (!sd->enabled_streams) {
+ /* Start streaming when the first pad is enabled. */
+ if (!sd->enabled_pads) {
ret = v4l2_subdev_call(sd, video, s_stream, 1);
if (ret)
return ret;
}
- sd->enabled_streams |= streams_mask;
+ sd->enabled_pads |= BIT_ULL(pad);
return 0;
}
@@ -2256,37 +2262,43 @@ static int v4l2_subdev_disable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
- unsigned int i;
int ret;
/*
- * If the subdev doesn't implement pad-based stream enable, fall back
- * on the .s_stream() operation. This can only be done for subdevs that
- * have a single source pad, as sd->enabled_streams is global to the
- * subdev.
+ * If the subdev doesn't implement pad-based stream enable, fall back
+ * to the .s_stream() operation.
*/
if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
return -EOPNOTSUPP;
- for (i = 0; i < sd->entity.num_pads; ++i) {
- if (i != pad && sd->entity.pads[i].flags & MEDIA_PAD_FL_SOURCE)
- return -EOPNOTSUPP;
- }
+ /*
+ * .s_stream() means there is no streams support, so the only allowed
+ * stream is the implicit stream 0.
+ */
+ if (streams_mask != BIT_ULL(0))
+ return -EOPNOTSUPP;
+
+ /*
+ * We use a 64-bit bitmask for tracking enabled pads, so only subdevices
+ * with 64 pads or less can be supported.
+ */
+ if (pad >= sizeof(sd->enabled_pads) * BITS_PER_BYTE)
+ return -EOPNOTSUPP;
- if ((sd->enabled_streams & streams_mask) != streams_mask) {
- dev_dbg(dev, "set of streams %#llx already disabled on %s:%u\n",
- streams_mask, sd->entity.name, pad);
+ if (!(sd->enabled_pads & BIT_ULL(pad))) {
+ dev_dbg(dev, "pad %u already disabled on %s\n",
+ pad, sd->entity.name);
return -EALREADY;
}
/* Stop streaming when the last streams are disabled. */
- if (!(sd->enabled_streams & ~streams_mask)) {
+ if (!(sd->enabled_pads & ~BIT_ULL(pad))) {
ret = v4l2_subdev_call(sd, video, s_stream, 0);
if (ret)
return ret;
}
- sd->enabled_streams &= ~streams_mask;
+ sd->enabled_pads &= ~BIT_ULL(pad);
return 0;
}
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index dccf693c680e..37c623f39dae 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1039,10 +1039,9 @@ struct v4l2_subdev_platform_data {
* @active_state: Active state for the subdev (NULL for subdevs tracking the
* state internally). Initialized by calling
* v4l2_subdev_init_finalize().
- * @enabled_streams: Bitmask of enabled streams used by
- * v4l2_subdev_enable_streams() and
- * v4l2_subdev_disable_streams() helper functions for fallback
- * cases.
+ * @enabled_pads: Bitmask of enabled pads used by v4l2_subdev_enable_streams()
+ * and v4l2_subdev_disable_streams() helper functions for
+ * fallback cases.
* @s_stream_enabled: Tracks whether streaming has been enabled with s_stream.
* This is only for call_s_stream() internal use.
*
@@ -1092,7 +1091,7 @@ struct v4l2_subdev {
* doesn't support it.
*/
struct v4l2_subdev_state *active_state;
- u64 enabled_streams;
+ u64 enabled_pads;
bool s_stream_enabled;
};
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 06/11] media: subdev: Add v4l2_subdev_is_streaming()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (4 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 05/11] media: subdev: Improve v4l2_subdev_enable/disable_streams_fallback Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 07/11] media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
` (4 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
Add a helper function which returns whether the subdevice is streaming,
i.e. if .s_stream or .enable_streams has been called successfully.
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 25 +++++++++++++++++++++++++
include/media/v4l2-subdev.h | 13 +++++++++++++
2 files changed, 38 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 3fe3de5abead..c877646047d1 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2454,6 +2454,31 @@ void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
}
EXPORT_SYMBOL_GPL(v4l2_subdev_notify_event);
+bool v4l2_subdev_is_streaming(struct v4l2_subdev *sd)
+{
+ struct v4l2_subdev_state *state;
+
+ if (!v4l2_subdev_has_op(sd, pad, enable_streams))
+ return sd->s_stream_enabled;
+
+ if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS))
+ return !!sd->enabled_pads;
+
+ state = v4l2_subdev_get_locked_active_state(sd);
+
+ 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->enabled)
+ return true;
+ }
+
+ return false;
+}
+EXPORT_SYMBOL_GPL(v4l2_subdev_is_streaming);
+
int v4l2_subdev_get_privacy_led(struct v4l2_subdev *sd)
{
#if IS_REACHABLE(CONFIG_LEDS_CLASS)
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 37c623f39dae..14a3c91cce93 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -1914,4 +1914,17 @@ extern const struct v4l2_subdev_ops v4l2_subdev_call_wrappers;
void v4l2_subdev_notify_event(struct v4l2_subdev *sd,
const struct v4l2_event *ev);
+/**
+ * v4l2_subdev_is_streaming() - Returns if the subdevice is streaming
+ * @sd: The subdevice
+ *
+ * v4l2_subdev_is_streaming() tells if the subdevice is currently streaming.
+ * "Streaming" here means whether .s_stream() or .enable_streams() has been
+ * successfully called, and the streaming has not yet been disabled.
+ *
+ * If the subdevice implements .enable_streams() this function must be called
+ * while holding the active state lock.
+ */
+bool v4l2_subdev_is_streaming(struct v4l2_subdev *sd);
+
#endif /* _V4L2_SUBDEV_H */
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 07/11] media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (5 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 06/11] media: subdev: Add v4l2_subdev_is_streaming() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 08/11] media: subdev: Refactor v4l2_subdev_enable/disable_streams() Tomi Valkeinen
` (3 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
We support camera privacy leds with the .s_stream() operation, in
call_s_stream(), but we don't have that support when the subdevice
implements .enable/disable_streams() operations.
Add the support by enabling the led when the first stream for a
subdevice is enabled, and disabling the led then the last stream is
disabled.
Reviewed-by: Umang Jain <umang.jain@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index c877646047d1..7d0343e8480b 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2185,6 +2185,7 @@ 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;
int ret;
@@ -2233,6 +2234,8 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
+ already_streaming = v4l2_subdev_is_streaming(sd);
+
/* Call the .enable_streams() operation. */
ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
streams_mask);
@@ -2251,6 +2254,9 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
cfg->enabled = true;
}
+ if (!already_streaming)
+ v4l2_subdev_enable_privacy_led(sd);
+
done:
v4l2_subdev_unlock_state(state);
@@ -2375,6 +2381,9 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
}
done:
+ if (!v4l2_subdev_is_streaming(sd))
+ v4l2_subdev_disable_privacy_led(sd);
+
v4l2_subdev_unlock_state(state);
return ret;
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 08/11] media: subdev: Refactor v4l2_subdev_enable/disable_streams()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (6 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 07/11] media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 09/11] media: subdev: Support single-stream case in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
` (2 subsequent siblings)
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
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.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 109 +++++++++++++++++++---------------
1 file changed, 60 insertions(+), 49 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 7d0343e8480b..98629fa6de49 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2135,6 +2135,42 @@ 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 =
+ &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 =
+ &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)
{
@@ -2186,8 +2222,8 @@ 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. */
@@ -2208,22 +2244,9 @@ 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",
@@ -2232,6 +2255,13 @@ 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 = -EALREADY;
+ goto done;
+ }
+
dev_dbg(dev, "enable streams %u:%#llx\n", pad, streams_mask);
already_streaming = v4l2_subdev_is_streaming(sd);
@@ -2246,13 +2276,7 @@ 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);
if (!already_streaming)
v4l2_subdev_enable_privacy_led(sd);
@@ -2314,8 +2338,8 @@ 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. */
@@ -2336,22 +2360,9 @@ 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",
@@ -2360,6 +2371,13 @@ 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 = -EALREADY;
+ goto done;
+ }
+
dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
/* Call the .disable_streams() operation. */
@@ -2371,14 +2389,7 @@ 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
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 09/11] media: subdev: Support single-stream case in v4l2_subdev_enable/disable_streams()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (7 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 08/11] media: subdev: Refactor v4l2_subdev_enable/disable_streams() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 10/11] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 11/11] media: subdev: Improve s_stream documentation Tomi Valkeinen
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
At the moment the v4l2_subdev_enable/disable_streams() functions call
fallback helpers to handle the case where the subdev only implements
.s_stream(), and the main function handles the case where the subdev
implements streams (V4L2_SUBDEV_FL_STREAMS, which implies
.enable/disable_streams()).
What is missing is support for subdevs which do not implement streams
support, but do implement .enable/disable_streams(). Example cases of
these subdevices are single-stream cameras, where using
.enable/disable_streams() is not required but helps us remove the users
of the legacy .s_stream(), and subdevices with multiple source pads (but
single stream per pad), where .enable/disable_streams() allows the
subdevice to control the enable/disable state per pad.
The two single-streams cases (.s_stream() and .enable/disable_streams())
are very similar, and with small changes we can change the
v4l2_subdev_enable/disable_streams() functions to support all three
cases, without needing separate fallback functions.
A few potentially problematic details, though:
- For the single-streams cases we use sd->enabled_pads field, which
limits the number of pads for the subdevice to 64. For simplicity I
added the check for this limitation to the beginning of the function,
and it also applies to the streams case.
- The fallback functions only allowed the target pad to be a source pad.
It is not very clear to me why this check was needed, but it was not
needed in the streams case. However, I doubt the
v4l2_subdev_enable/disable_streams() code has ever been tested with
sink pads, so to be on the safe side, I added the same check
to the v4l2_subdev_enable/disable_streams() functions.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
drivers/media/v4l2-core/v4l2-subdev.c | 194 +++++++++++++++-------------------
1 file changed, 86 insertions(+), 108 deletions(-)
diff --git a/drivers/media/v4l2-core/v4l2-subdev.c b/drivers/media/v4l2-core/v4l2-subdev.c
index 98629fa6de49..72085027e213 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2141,6 +2141,13 @@ static void v4l2_subdev_collect_streams(struct v4l2_subdev *sd,
u64 *found_streams,
u64 *enabled_streams)
{
+ if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS)) {
+ *found_streams = BIT_ULL(0);
+ *enabled_streams =
+ (sd->enabled_pads & BIT_ULL(pad)) ? BIT_ULL(0) : 0;
+ return;
+ }
+
*found_streams = 0;
*enabled_streams = 0;
@@ -2162,6 +2169,14 @@ static void v4l2_subdev_set_streams_enabled(struct v4l2_subdev *sd,
u32 pad, u64 streams_mask,
bool enabled)
{
+ if (!(sd->flags & V4L2_SUBDEV_FL_STREAMS)) {
+ if (enabled)
+ sd->enabled_pads |= BIT_ULL(pad);
+ else
+ sd->enabled_pads &= ~BIT_ULL(pad);
+ return;
+ }
+
for (unsigned int i = 0; i < state->stream_configs.num_configs; ++i) {
struct v4l2_subdev_stream_config *cfg =
&state->stream_configs.configs[i];
@@ -2171,51 +2186,6 @@ static void v4l2_subdev_set_streams_enabled(struct v4l2_subdev *sd,
}
}
-static int v4l2_subdev_enable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
- u64 streams_mask)
-{
- struct device *dev = sd->entity.graph_obj.mdev->dev;
- int ret;
-
- /*
- * The subdev doesn't implement pad-based stream enable, fall back
- * to the .s_stream() operation.
- */
- if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
- return -EOPNOTSUPP;
-
- /*
- * .s_stream() means there is no streams support, so the only allowed
- * stream is the implicit stream 0.
- */
- if (streams_mask != BIT_ULL(0))
- return -EOPNOTSUPP;
-
- /*
- * We use a 64-bit bitmask for tracking enabled pads, so only subdevices
- * with 64 pads or less can be supported.
- */
- if (pad >= sizeof(sd->enabled_pads) * BITS_PER_BYTE)
- return -EOPNOTSUPP;
-
- if (sd->enabled_pads & BIT_ULL(pad)) {
- dev_dbg(dev, "pad %u already enabled on %s\n",
- pad, sd->entity.name);
- return -EALREADY;
- }
-
- /* Start streaming when the first pad is enabled. */
- if (!sd->enabled_pads) {
- ret = v4l2_subdev_call(sd, video, s_stream, 1);
- if (ret)
- return ret;
- }
-
- sd->enabled_pads |= BIT_ULL(pad);
-
- return 0;
-}
-
int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
u64 streams_mask)
{
@@ -2224,21 +2194,33 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
bool already_streaming;
u64 enabled_streams;
u64 found_streams;
+ bool use_s_stream;
int ret;
/* A few basic sanity checks first. */
if (pad >= sd->entity.num_pads)
return -EINVAL;
+ if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
+ return -EOPNOTSUPP;
+
+ /*
+ * We use a 64-bit bitmask for tracking enabled pads, so only subdevices
+ * with 64 pads or less can be supported.
+ */
+ if (pad >= sizeof(sd->enabled_pads) * BITS_PER_BYTE)
+ return -EOPNOTSUPP;
+
if (!streams_mask)
return 0;
/* Fallback on .s_stream() if .enable_streams() isn't available. */
- if (!v4l2_subdev_has_op(sd, pad, enable_streams))
- return v4l2_subdev_enable_streams_fallback(sd, pad,
- streams_mask);
+ use_s_stream = !v4l2_subdev_has_op(sd, pad, enable_streams);
- state = v4l2_subdev_lock_and_get_active_state(sd);
+ if (!use_s_stream)
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+ else
+ state = NULL;
/*
* Verify that the requested streams exist and that they are not
@@ -2266,9 +2248,18 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
already_streaming = v4l2_subdev_is_streaming(sd);
- /* Call the .enable_streams() operation. */
- ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
- streams_mask);
+ if (!use_s_stream) {
+ /* Call the .enable_streams() operation. */
+ ret = v4l2_subdev_call(sd, pad, enable_streams, state, pad,
+ streams_mask);
+ } else {
+ /* Start streaming when the first pad is enabled. */
+ if (!already_streaming)
+ ret = v4l2_subdev_call(sd, video, s_stream, 1);
+ else
+ ret = 0;
+ }
+
if (ret) {
dev_dbg(dev, "enable streams %u:%#llx failed: %d\n", pad,
streams_mask, ret);
@@ -2278,34 +2269,39 @@ int v4l2_subdev_enable_streams(struct v4l2_subdev *sd, u32 pad,
/* Mark the streams as enabled. */
v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, true);
- if (!already_streaming)
+ /*
+ * TODO: When all the drivers have been changed to use
+ * v4l2_subdev_enable_streams() and v4l2_subdev_disable_streams(),
+ * instead of calling .s_stream() operation directly, we can remove
+ * the privacy LED handling from call_s_stream() and do it here
+ * for all cases.
+ */
+ if (!use_s_stream && !already_streaming)
v4l2_subdev_enable_privacy_led(sd);
done:
- v4l2_subdev_unlock_state(state);
+ if (!use_s_stream)
+ v4l2_subdev_unlock_state(state);
return ret;
}
EXPORT_SYMBOL_GPL(v4l2_subdev_enable_streams);
-static int v4l2_subdev_disable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
- u64 streams_mask)
+int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
+ u64 streams_mask)
{
struct device *dev = sd->entity.graph_obj.mdev->dev;
+ struct v4l2_subdev_state *state;
+ u64 enabled_streams;
+ u64 found_streams;
+ bool use_s_stream;
int ret;
- /*
- * If the subdev doesn't implement pad-based stream enable, fall back
- * to the .s_stream() operation.
- */
- if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
- return -EOPNOTSUPP;
+ /* A few basic sanity checks first. */
+ if (pad >= sd->entity.num_pads)
+ return -EINVAL;
- /*
- * .s_stream() means there is no streams support, so the only allowed
- * stream is the implicit stream 0.
- */
- if (streams_mask != BIT_ULL(0))
+ if (!(sd->entity.pads[pad].flags & MEDIA_PAD_FL_SOURCE))
return -EOPNOTSUPP;
/*
@@ -2315,46 +2311,16 @@ static int v4l2_subdev_disable_streams_fallback(struct v4l2_subdev *sd, u32 pad,
if (pad >= sizeof(sd->enabled_pads) * BITS_PER_BYTE)
return -EOPNOTSUPP;
- if (!(sd->enabled_pads & BIT_ULL(pad))) {
- dev_dbg(dev, "pad %u already disabled on %s\n",
- pad, sd->entity.name);
- return -EALREADY;
- }
-
- /* Stop streaming when the last streams are disabled. */
- if (!(sd->enabled_pads & ~BIT_ULL(pad))) {
- ret = v4l2_subdev_call(sd, video, s_stream, 0);
- if (ret)
- return ret;
- }
-
- sd->enabled_pads &= ~BIT_ULL(pad);
-
- return 0;
-}
-
-int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
- u64 streams_mask)
-{
- struct device *dev = sd->entity.graph_obj.mdev->dev;
- struct v4l2_subdev_state *state;
- u64 enabled_streams;
- u64 found_streams;
- int ret;
-
- /* A few basic sanity checks first. */
- if (pad >= sd->entity.num_pads)
- return -EINVAL;
-
if (!streams_mask)
return 0;
/* Fallback on .s_stream() if .disable_streams() isn't available. */
- if (!v4l2_subdev_has_op(sd, pad, disable_streams))
- return v4l2_subdev_disable_streams_fallback(sd, pad,
- streams_mask);
+ use_s_stream = !v4l2_subdev_has_op(sd, pad, disable_streams);
- state = v4l2_subdev_lock_and_get_active_state(sd);
+ if (!use_s_stream)
+ state = v4l2_subdev_lock_and_get_active_state(sd);
+ else
+ state = NULL;
/*
* Verify that the requested streams exist and that they are not
@@ -2380,9 +2346,19 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
dev_dbg(dev, "disable streams %u:%#llx\n", pad, streams_mask);
- /* Call the .disable_streams() operation. */
- ret = v4l2_subdev_call(sd, pad, disable_streams, state, pad,
- streams_mask);
+ if (!use_s_stream) {
+ /* Call the .disable_streams() operation. */
+ ret = v4l2_subdev_call(sd, pad, disable_streams, state, pad,
+ streams_mask);
+ } else {
+ /* Stop streaming when the last streams are disabled. */
+
+ if (!(sd->enabled_pads & ~BIT_ULL(pad)))
+ ret = v4l2_subdev_call(sd, video, s_stream, 0);
+ else
+ ret = 0;
+ }
+
if (ret) {
dev_dbg(dev, "disable streams %u:%#llx failed: %d\n", pad,
streams_mask, ret);
@@ -2392,10 +2368,12 @@ int v4l2_subdev_disable_streams(struct v4l2_subdev *sd, u32 pad,
v4l2_subdev_set_streams_enabled(sd, state, pad, streams_mask, false);
done:
- if (!v4l2_subdev_is_streaming(sd))
- v4l2_subdev_disable_privacy_led(sd);
+ if (!use_s_stream) {
+ if (!v4l2_subdev_is_streaming(sd))
+ v4l2_subdev_disable_privacy_led(sd);
- v4l2_subdev_unlock_state(state);
+ v4l2_subdev_unlock_state(state);
+ }
return ret;
}
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 10/11] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper()
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (8 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 09/11] media: subdev: Support single-stream case in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 11/11] media: subdev: Improve s_stream documentation Tomi Valkeinen
10 siblings, 0 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
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.
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Tested-by: Umang Jain <umang.jain@ideasonboard.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.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 72085027e213..88cfa5e0157a 100644
--- a/drivers/media/v4l2-core/v4l2-subdev.c
+++ b/drivers/media/v4l2-core/v4l2-subdev.c
@@ -2402,15 +2402,24 @@ 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(0);
+ }
if (enable)
return v4l2_subdev_enable_streams(sd, pad_index, source_mask);
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* [PATCH v6 11/11] media: subdev: Improve s_stream documentation
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
` (9 preceding siblings ...)
2024-04-24 15:39 ` [PATCH v6 10/11] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper() Tomi Valkeinen
@ 2024-04-24 15:39 ` Tomi Valkeinen
2024-04-24 16:33 ` Umang Jain
2024-04-25 11:08 ` Laurent Pinchart
10 siblings, 2 replies; 15+ messages in thread
From: Tomi Valkeinen @ 2024-04-24 15:39 UTC (permalink / raw)
To: Mauro Carvalho Chehab, Hans Verkuil, Laurent Pinchart,
Sakari Ailus, Umang Jain
Cc: linux-media, linux-kernel, Tomi Valkeinen
Now that enable/disable_streams operations are available for
single-stream subdevices too, there's no reason to use the old s_stream
operation on new drivers. Extend the documentation reflecting this.
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
---
include/media/v4l2-subdev.h | 9 +++++++++
1 file changed, 9 insertions(+)
diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
index 14a3c91cce93..99564a2ef71c 100644
--- a/include/media/v4l2-subdev.h
+++ b/include/media/v4l2-subdev.h
@@ -450,6 +450,15 @@ enum v4l2_subdev_pre_streamon_flags {
* already started or stopped subdev. Also see call_s_stream wrapper in
* v4l2-subdev.c.
*
+ * New drivers should instead implement &v4l2_subdev_pad_ops.enable_streams
+ * and &v4l2_subdev_pad_ops.disable_streams operations, and use
+ * v4l2_subdev_s_stream_helper for the &v4l2_subdev_video_ops.s_stream
+ * operation to support legacy users.
+ *
+ * Drivers should also not call the .s_stream() subdev operation directly,
+ * but use the v4l2_subdev_enable_streams() and
+ * v4l2_subdev_disable_streams() helpers.
+ *
* @g_pixelaspect: callback to return the pixelaspect ratio.
*
* @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
--
2.34.1
^ permalink raw reply related [flat|nested] 15+ messages in thread
* Re: [PATCH v6 11/11] media: subdev: Improve s_stream documentation
2024-04-24 15:39 ` [PATCH v6 11/11] media: subdev: Improve s_stream documentation Tomi Valkeinen
@ 2024-04-24 16:33 ` Umang Jain
2024-04-25 11:08 ` Laurent Pinchart
1 sibling, 0 replies; 15+ messages in thread
From: Umang Jain @ 2024-04-24 16:33 UTC (permalink / raw)
To: Tomi Valkeinen, Mauro Carvalho Chehab, Hans Verkuil,
Laurent Pinchart, Sakari Ailus
Cc: linux-media, linux-kernel
Hi Tomi,
On 24/04/24 9:09 pm, Tomi Valkeinen wrote:
> Now that enable/disable_streams operations are available for
> single-stream subdevices too, there's no reason to use the old s_stream
> operation on new drivers. Extend the documentation reflecting this.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Umang Jain<umang.jain@ideasonboard.com>
> ---
> include/media/v4l2-subdev.h | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 14a3c91cce93..99564a2ef71c 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -450,6 +450,15 @@ enum v4l2_subdev_pre_streamon_flags {
> * already started or stopped subdev. Also see call_s_stream wrapper in
> * v4l2-subdev.c.
> *
> + * New drivers should instead implement &v4l2_subdev_pad_ops.enable_streams
> + * and &v4l2_subdev_pad_ops.disable_streams operations, and use
> + * v4l2_subdev_s_stream_helper for the &v4l2_subdev_video_ops.s_stream
> + * operation to support legacy users.
> + *
> + * Drivers should also not call the .s_stream() subdev operation directly,
> + * but use the v4l2_subdev_enable_streams() and
> + * v4l2_subdev_disable_streams() helpers.
> + *
> * @g_pixelaspect: callback to return the pixelaspect ratio.
> *
> * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
>
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v6 11/11] media: subdev: Improve s_stream documentation
2024-04-24 15:39 ` [PATCH v6 11/11] media: subdev: Improve s_stream documentation Tomi Valkeinen
2024-04-24 16:33 ` Umang Jain
@ 2024-04-25 11:08 ` Laurent Pinchart
2024-04-25 11:15 ` Sakari Ailus
1 sibling, 1 reply; 15+ messages in thread
From: Laurent Pinchart @ 2024-04-25 11:08 UTC (permalink / raw)
To: Tomi Valkeinen
Cc: Mauro Carvalho Chehab, Hans Verkuil, Sakari Ailus, Umang Jain,
linux-media, linux-kernel
Hi Tomi,
Thank you for the patch.
On Wed, Apr 24, 2024 at 06:39:14PM +0300, Tomi Valkeinen wrote:
> Now that enable/disable_streams operations are available for
> single-stream subdevices too, there's no reason to use the old s_stream
> operation on new drivers. Extend the documentation reflecting this.
>
> Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
> ---
> include/media/v4l2-subdev.h | 9 +++++++++
> 1 file changed, 9 insertions(+)
>
> diff --git a/include/media/v4l2-subdev.h b/include/media/v4l2-subdev.h
> index 14a3c91cce93..99564a2ef71c 100644
> --- a/include/media/v4l2-subdev.h
> +++ b/include/media/v4l2-subdev.h
> @@ -450,6 +450,15 @@ enum v4l2_subdev_pre_streamon_flags {
> * already started or stopped subdev. Also see call_s_stream wrapper in
> * v4l2-subdev.c.
> *
> + * New drivers should instead implement &v4l2_subdev_pad_ops.enable_streams
> + * and &v4l2_subdev_pad_ops.disable_streams operations, and use
> + * v4l2_subdev_s_stream_helper for the &v4l2_subdev_video_ops.s_stream
> + * operation to support legacy users.
> + *
> + * Drivers should also not call the .s_stream() subdev operation directly,
> + * but use the v4l2_subdev_enable_streams() and
> + * v4l2_subdev_disable_streams() helpers.
> + *
> * @g_pixelaspect: callback to return the pixelaspect ratio.
> *
> * @s_rx_buffer: set a host allocated memory buffer for the subdev. The subdev
--
Regards,
Laurent Pinchart
^ permalink raw reply [flat|nested] 15+ messages in thread
* Re: [PATCH v6 11/11] media: subdev: Improve s_stream documentation
2024-04-25 11:08 ` Laurent Pinchart
@ 2024-04-25 11:15 ` Sakari Ailus
0 siblings, 0 replies; 15+ messages in thread
From: Sakari Ailus @ 2024-04-25 11:15 UTC (permalink / raw)
To: Laurent Pinchart
Cc: Tomi Valkeinen, Mauro Carvalho Chehab, Hans Verkuil, Umang Jain,
linux-media, linux-kernel
Hi Laurent, others,
On Thu, Apr 25, 2024 at 02:08:54PM +0300, Laurent Pinchart wrote:
> Hi Tomi,
>
> Thank you for the patch.
>
> On Wed, Apr 24, 2024 at 06:39:14PM +0300, Tomi Valkeinen wrote:
> > Now that enable/disable_streams operations are available for
> > single-stream subdevices too, there's no reason to use the old s_stream
> > operation on new drivers. Extend the documentation reflecting this.
> >
> > Signed-off-by: Tomi Valkeinen <tomi.valkeinen@ideasonboard.com>
>
> Reviewed-by: Laurent Pinchart <laurent.pinchart@ideasonboard.com>
Thanks!
If there are no further comments requiring changes, I'll send a PR on these
with Umang's imx335 and my CCS driver patches tomorrow.
--
Kind regards,
Sakari Ailus
^ permalink raw reply [flat|nested] 15+ messages in thread
end of thread, other threads:[~2024-04-25 11:15 UTC | newest]
Thread overview: 15+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2024-04-24 15:39 [PATCH v6 00/11] media: subdev: Improve stream enable/disable machinery Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 01/11] media: subdev: Add privacy led helpers Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 02/11] media: subdev: Use v4l2_subdev_has_op() in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 03/11] media: subdev: Add checks for subdev features Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 04/11] media: subdev: Fix use of sd->enabled_streams in call_s_stream() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 05/11] media: subdev: Improve v4l2_subdev_enable/disable_streams_fallback Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 06/11] media: subdev: Add v4l2_subdev_is_streaming() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 07/11] media: subdev: Support privacy led in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 08/11] media: subdev: Refactor v4l2_subdev_enable/disable_streams() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 09/11] media: subdev: Support single-stream case in v4l2_subdev_enable/disable_streams() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 10/11] media: subdev: Support non-routing subdevs in v4l2_subdev_s_stream_helper() Tomi Valkeinen
2024-04-24 15:39 ` [PATCH v6 11/11] media: subdev: Improve s_stream documentation Tomi Valkeinen
2024-04-24 16:33 ` Umang Jain
2024-04-25 11:08 ` Laurent Pinchart
2024-04-25 11:15 ` Sakari Ailus
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