[PATCH v2 1/3] drm/bridge: introduce bridge detaching mechanism

[PATCH v2 1/3] drm/bridge: introduce bridge detaching mechanism

[Andrea Merello]

Up to now, once a bridge has been attached to a DRM device, it cannot
be undone.

In particular you couldn't rmmod/insmod a DRM driver that uses a bridge,
because the bridge would remain bound to the first (dead) driver instance.

This patch fixes this by introducing drm_encoder_detach() and a ->detach
callback in drm_bridge_funcs for the bridge to be notified about detaches.

It's DRM/KMS driver responsibility to call drm_encoder_detach().

While adding the bridge detach callback, with its kerneldoc, I also added
kerneldoc for attach callback.

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Suggested-by: Lucas Stach <l.stach@pengutronix.de>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Cc: Archit Taneja <architt@codeaurora.org>
Cc: David Airlie <airlied@linux.ie>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: Lucas Stach <l.stach@pengutronix.de>
---
 drivers/gpu/drm/drm_bridge.c | 26 ++++++++++++++++++++++++++
 include/drm/drm_crtc.h       | 17 +++++++++++++++++
 2 files changed, 43 insertions(+)

diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
index 2555430..a77b3e0 100644
--- a/drivers/gpu/drm/drm_bridge.c
+++ b/drivers/gpu/drm/drm_bridge.c
@@ -125,6 +125,32 @@ int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge)
 EXPORT_SYMBOL(drm_bridge_attach);
 
 /**
+ * drm_bridge_detach - deassociate given bridge from its DRM device
+ *
+ * @bridge: bridge control structure
+ *
+ * called by a kms driver to unlink the given bridge from its DRM device
+ *
+ * Note that tearing down links between the bridge and our encoder/bridge
+ * objects needs to be handled by the kms driver itself
+ *
+ */
+void drm_bridge_detach(struct drm_bridge *bridge)
+{
+	if (WARN_ON(!bridge))
+		return;
+
+	if (WARN_ON(!bridge->dev))
+		return;
+
+	if (bridge->funcs->detach)
+		bridge->funcs->detach(bridge);
+
+	bridge->dev = NULL;
+}
+EXPORT_SYMBOL(drm_bridge_detach);
+
+/**
  * DOC: bridge callbacks
  *
  * The &drm_bridge_funcs ops are populated by the bridge driver. The DRM
diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
index b618b50..5e25e23 100644
--- a/include/drm/drm_crtc.h
+++ b/include/drm/drm_crtc.h
@@ -1765,9 +1765,25 @@ struct drm_plane {
  * @attach: Called during drm_bridge_attach
  */
 struct drm_bridge_funcs {
+	/**
+	 * @attach:
+	 *
+	 * This callback is invoked whenever our bridge is being attached.
+	 *
+	 * RETURNS:
+	 *
+	 * Zero on success, error code on failure
+	 */
 	int (*attach)(struct drm_bridge *bridge);
 
 	/**
+	 * @detach:
+	 *
+	 * This callback is invoked whenever our bridge is being detached.
+	 */
+	void (*detach)(struct drm_bridge *bridge);
+
+	/**
 	 * @mode_fixup:
 	 *
 	 * This callback is used to validate and adjust a mode. The paramater
@@ -3196,6 +3212,7 @@ extern int drm_bridge_add(struct drm_bridge *bridge);
 extern void drm_bridge_remove(struct drm_bridge *bridge);
 extern struct drm_bridge *of_drm_find_bridge(struct device_node *np);
 extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge);
+extern void drm_bridge_detach(struct drm_bridge *bridge);
 
 bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
 			const struct drm_display_mode *mode,
-- 
2.7.4

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[PATCH v2 2/3] drm: simple_kms_helper: make connector optional at init time

[Andrea Merello]

drm_simple_display_pipe_init() pretends to attach a connector
to the display pipe.

In case a drm bridge has to be used, then it's the bridge that
takes care of connectors.

This patch makes the connector parameter optional for
drm_simple_display_pipe_init(), so that a drm bridge could
handle connector by itself later.

Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Cc: David Airlie <airlied@linux.ie>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
---
 drivers/gpu/drm/drm_simple_kms_helper.c | 9 ++++++---
 1 file changed, 6 insertions(+), 3 deletions(-)

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index aeb7a75..d07cdb8 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -146,10 +146,13 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
  * @funcs: callbacks for the display pipe (optional)
  * @formats: array of supported formats (%DRM_FORMAT_*)
  * @format_count: number of elements in @formats
- * @connector: connector to attach and register
+ * @connector: connector to attach and register (optional)
  *
  * Sets up a display pipeline which consist of a really simple
- * plane-crtc-encoder pipe coupled with the provided connector.
+ * plane-crtc-encoder pipe.
+ * If a connector is supplied, the pipe will be coupled with the provided
+ * connector. You may supply a NULL connector when using drm bridges, that
+ * handle connectors themselves (see drm_simple_display_pipe_bridge_attach()).
  * Teardown of a simple display pipe is all handled automatically by the drm
  * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
  * release the memory for the structure themselves.
@@ -188,7 +191,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
 	encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
 	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
 			       DRM_MODE_ENCODER_NONE, NULL);
-	if (ret)
+	if (ret || !connector)
 		return ret;
 
 	return drm_mode_connector_attach_encoder(connector, encoder);
-- 
2.7.4

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[PATCH v2 3/3] drm: simple_kms_helper: add support for bridges

[Andrea Merello]

Introduce drm_simple_display_pipe_attach_bridge() and
drm_simple_display_pipe_detach_bridge() in order to make it possible to use
drm encoders with the simple display pipes managed by simple_kms_helpers

Suggested-by: Daniel Vetter <daniel@ffwll.ch>
Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
Cc: Noralf Trønnes <noralf@tronnes.org>
Cc: Daniel Vetter <daniel@ffwll.ch>
Cc: David Airlie <airlied@linux.ie>
---
 drivers/gpu/drm/drm_simple_kms_helper.c | 42 ++++++++++++++++++++++++++++++++-
 include/drm/drm_simple_kms_helper.h     |  5 ++++
 2 files changed, 46 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
index d07cdb8..dfa3f1b 100644
--- a/drivers/gpu/drm/drm_simple_kms_helper.c
+++ b/drivers/gpu/drm/drm_simple_kms_helper.c
@@ -140,6 +140,46 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
 };
 
 /**
+ * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
+ * @pipe: simple display pipe object
+ * @bridge: bridge to attach
+ *
+ * Makes it possible to still use the drm_simple_display_pipe helpers when
+ * a DRM bridge has to be used.
+ * Note that you probably want to initialize the pipe by passing a NULL
+ * connector to drm_simple_display_pipe_init()
+ *
+ * Returns:
+ * Zero on success, negative error code on failure.
+ */
+int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
+					struct drm_bridge *bridge)
+{
+	bridge->encoder = &pipe->encoder;
+	pipe->encoder.bridge = bridge;
+	return drm_bridge_attach(pipe->encoder.dev, bridge);
+}
+EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
+
+/**
+ * drm_simple_display_pipe_detach_bridge - Detach the bridge from the display pipe
+ * @pipe: simple display pipe object
+ *
+ * Detaches the drm bridge previously attached with
+ * drm_simple_display_pipe_attach_bridge()
+ *
+ */
+void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe)
+{
+	if (WARN_ON(!pipe->encoder.bridge))
+		return;
+
+	drm_bridge_detach(pipe->encoder.bridge);
+	pipe->encoder.bridge = NULL;
+}
+EXPORT_SYMBOL(drm_simple_display_pipe_detach_bridge);
+
+/**
  * drm_simple_display_pipe_init - Initialize a simple display pipeline
  * @dev: DRM device
  * @pipe: simple display pipe object to initialize
@@ -152,7 +192,7 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
  * plane-crtc-encoder pipe.
  * If a connector is supplied, the pipe will be coupled with the provided
  * connector. You may supply a NULL connector when using drm bridges, that
- * handle connectors themselves (see drm_simple_display_pipe_bridge_attach()).
+ * handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
  * Teardown of a simple display pipe is all handled automatically by the drm
  * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
  * release the memory for the structure themselves.
diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
index 2690397..5245d1f 100644
--- a/include/drm/drm_simple_kms_helper.h
+++ b/include/drm/drm_simple_kms_helper.h
@@ -85,6 +85,11 @@ struct drm_simple_display_pipe {
 	const struct drm_simple_display_pipe_funcs *funcs;
 };
 
+int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
+					struct drm_bridge *bridge);
+
+void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe);
+
 int drm_simple_display_pipe_init(struct drm_device *dev,
 			struct drm_simple_display_pipe *pipe,
 			const struct drm_simple_display_pipe_funcs *funcs,
-- 
2.7.4

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Re: [PATCH v2 1/3] drm/bridge: introduce bridge detaching mechanism

[Daniel Vetter]

On Wed, Aug 24, 2016 at 02:05:59PM +0200, Andrea Merello wrote:
> Up to now, once a bridge has been attached to a DRM device, it cannot
> be undone.
> 
> In particular you couldn't rmmod/insmod a DRM driver that uses a bridge,
> because the bridge would remain bound to the first (dead) driver instance.
> 
> This patch fixes this by introducing drm_encoder_detach() and a ->detach
> callback in drm_bridge_funcs for the bridge to be notified about detaches.
> 
> It's DRM/KMS driver responsibility to call drm_encoder_detach().
> 
> While adding the bridge detach callback, with its kerneldoc, I also added
> kerneldoc for attach callback.
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Suggested-by: Lucas Stach <l.stach@pengutronix.de>
> Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
> Cc: Archit Taneja <architt@codeaurora.org>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: Lucas Stach <l.stach@pengutronix.de>
> ---
>  drivers/gpu/drm/drm_bridge.c | 26 ++++++++++++++++++++++++++
>  include/drm/drm_crtc.h       | 17 +++++++++++++++++
>  2 files changed, 43 insertions(+)
> 
> diff --git a/drivers/gpu/drm/drm_bridge.c b/drivers/gpu/drm/drm_bridge.c
> index 2555430..a77b3e0 100644
> --- a/drivers/gpu/drm/drm_bridge.c
> +++ b/drivers/gpu/drm/drm_bridge.c
> @@ -125,6 +125,32 @@ int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge)
>  EXPORT_SYMBOL(drm_bridge_attach);
>  
>  /**
> + * drm_bridge_detach - deassociate given bridge from its DRM device
> + *
> + * @bridge: bridge control structure
> + *
> + * called by a kms driver to unlink the given bridge from its DRM device
> + *
> + * Note that tearing down links between the bridge and our encoder/bridge
> + * objects needs to be handled by the kms driver itself
> + *

Empty line, and we do full sentences (including capitalization and
punctuation) in the full kernel-doc paragraphs.

> + */
> +void drm_bridge_detach(struct drm_bridge *bridge)
> +{
> +	if (WARN_ON(!bridge))
> +		return;
> +
> +	if (WARN_ON(!bridge->dev))
> +		return;
> +
> +	if (bridge->funcs->detach)
> +		bridge->funcs->detach(bridge);
> +
> +	bridge->dev = NULL;
> +}
> +EXPORT_SYMBOL(drm_bridge_detach);
> +
> +/**
>   * DOC: bridge callbacks
>   *
>   * The &drm_bridge_funcs ops are populated by the bridge driver. The DRM
> diff --git a/include/drm/drm_crtc.h b/include/drm/drm_crtc.h
> index b618b50..5e25e23 100644
> --- a/include/drm/drm_crtc.h
> +++ b/include/drm/drm_crtc.h
> @@ -1765,9 +1765,25 @@ struct drm_plane {
>   * @attach: Called during drm_bridge_attach
>   */
>  struct drm_bridge_funcs {
> +	/**
> +	 * @attach:
> +	 *
> +	 * This callback is invoked whenever our bridge is being attached.

... attached to a &drm_encoder. Similar for @detach.

Also I think we should mentation that these callbacks are optional, like
with the others. Just noticed that that remark is missing for @mode_fixup,
can you pls add it too?

lgtm otherwise.
-Daniel

> +	 *
> +	 * RETURNS:
> +	 *
> +	 * Zero on success, error code on failure
> +	 */
>  	int (*attach)(struct drm_bridge *bridge);
>  
>  	/**
> +	 * @detach:
> +	 *
> +	 * This callback is invoked whenever our bridge is being detached.
> +	 */
> +	void (*detach)(struct drm_bridge *bridge);
> +
> +	/**
>  	 * @mode_fixup:
>  	 *
>  	 * This callback is used to validate and adjust a mode. The paramater
> @@ -3196,6 +3212,7 @@ extern int drm_bridge_add(struct drm_bridge *bridge);
>  extern void drm_bridge_remove(struct drm_bridge *bridge);
>  extern struct drm_bridge *of_drm_find_bridge(struct device_node *np);
>  extern int drm_bridge_attach(struct drm_device *dev, struct drm_bridge *bridge);
> +extern void drm_bridge_detach(struct drm_bridge *bridge);
>  
>  bool drm_bridge_mode_fixup(struct drm_bridge *bridge,
>  			const struct drm_display_mode *mode,
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH v2 2/3] drm: simple_kms_helper: make connector optional at init time

[Daniel Vetter]

On Wed, Aug 24, 2016 at 02:06:00PM +0200, Andrea Merello wrote:
> drm_simple_display_pipe_init() pretends to attach a connector
> to the display pipe.
> 
> In case a drm bridge has to be used, then it's the bridge that
> takes care of connectors.
> 
> This patch makes the connector parameter optional for
> drm_simple_display_pipe_init(), so that a drm bridge could
> handle connector by itself later.
> 
> Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
> Cc: David Airlie <airlied@linux.ie>
> Cc: Noralf Trønnes <noralf@tronnes.org>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> ---
>  drivers/gpu/drm/drm_simple_kms_helper.c | 9 ++++++---
>  1 file changed, 6 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index aeb7a75..d07cdb8 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -146,10 +146,13 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
>   * @funcs: callbacks for the display pipe (optional)
>   * @formats: array of supported formats (%DRM_FORMAT_*)
>   * @format_count: number of elements in @formats
> - * @connector: connector to attach and register
> + * @connector: connector to attach and register (optional)
>   *
>   * Sets up a display pipeline which consist of a really simple
> - * plane-crtc-encoder pipe coupled with the provided connector.
> + * plane-crtc-encoder pipe.

Nit: Empty comment line if you want to start a new paragraph. Otherwise
pls reflow the comment to make it use the full width.

With that Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

I guess I'll let Archit apply the entire series once it's all ready.
-Daniel

> + * If a connector is supplied, the pipe will be coupled with the provided
> + * connector. You may supply a NULL connector when using drm bridges, that
> + * handle connectors themselves (see drm_simple_display_pipe_bridge_attach()).
>   * Teardown of a simple display pipe is all handled automatically by the drm
>   * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
>   * release the memory for the structure themselves.
> @@ -188,7 +191,7 @@ int drm_simple_display_pipe_init(struct drm_device *dev,
>  	encoder->possible_crtcs = 1 << drm_crtc_index(crtc);
>  	ret = drm_encoder_init(dev, encoder, &drm_simple_kms_encoder_funcs,
>  			       DRM_MODE_ENCODER_NONE, NULL);
> -	if (ret)
> +	if (ret || !connector)
>  		return ret;
>  
>  	return drm_mode_connector_attach_encoder(connector, encoder);
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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Re: [PATCH v2 3/3] drm: simple_kms_helper: add support for bridges

[Daniel Vetter]

On Wed, Aug 24, 2016 at 02:06:01PM +0200, Andrea Merello wrote:
> Introduce drm_simple_display_pipe_attach_bridge() and
> drm_simple_display_pipe_detach_bridge() in order to make it possible to use
> drm encoders with the simple display pipes managed by simple_kms_helpers
> 
> Suggested-by: Daniel Vetter <daniel@ffwll.ch>
> Signed-off-by: Andrea Merello <andrea.merello@gmail.com>
> Cc: Noralf Trønnes <noralf@tronnes.org>
> Cc: Daniel Vetter <daniel@ffwll.ch>
> Cc: David Airlie <airlied@linux.ie>
> ---
>  drivers/gpu/drm/drm_simple_kms_helper.c | 42 ++++++++++++++++++++++++++++++++-
>  include/drm/drm_simple_kms_helper.h     |  5 ++++
>  2 files changed, 46 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/drm_simple_kms_helper.c b/drivers/gpu/drm/drm_simple_kms_helper.c
> index d07cdb8..dfa3f1b 100644
> --- a/drivers/gpu/drm/drm_simple_kms_helper.c
> +++ b/drivers/gpu/drm/drm_simple_kms_helper.c
> @@ -140,6 +140,46 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
>  };
>  
>  /**
> + * drm_simple_display_pipe_attach_bridge - Attach a bridge to the display pipe
> + * @pipe: simple display pipe object
> + * @bridge: bridge to attach
> + *
> + * Makes it possible to still use the drm_simple_display_pipe helpers when
> + * a DRM bridge has to be used.
> + * Note that you probably want to initialize the pipe by passing a NULL
> + * connector to drm_simple_display_pipe_init()

Same nit: New paragraphs need and empty line, or reflow to make it one
that uses the full width.

> + *
> + * Returns:
> + * Zero on success, negative error code on failure.
> + */
> +int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
> +					struct drm_bridge *bridge)
> +{
> +	bridge->encoder = &pipe->encoder;
> +	pipe->encoder.bridge = bridge;
> +	return drm_bridge_attach(pipe->encoder.dev, bridge);
> +}
> +EXPORT_SYMBOL(drm_simple_display_pipe_attach_bridge);
> +
> +/**
> + * drm_simple_display_pipe_detach_bridge - Detach the bridge from the display pipe
> + * @pipe: simple display pipe object
> + *
> + * Detaches the drm bridge previously attached with
> + * drm_simple_display_pipe_attach_bridge()
> + *

Empty line.

With the nits addressed: Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

> + */
> +void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe)
> +{
> +	if (WARN_ON(!pipe->encoder.bridge))
> +		return;
> +
> +	drm_bridge_detach(pipe->encoder.bridge);
> +	pipe->encoder.bridge = NULL;
> +}
> +EXPORT_SYMBOL(drm_simple_display_pipe_detach_bridge);
> +
> +/**
>   * drm_simple_display_pipe_init - Initialize a simple display pipeline
>   * @dev: DRM device
>   * @pipe: simple display pipe object to initialize
> @@ -152,7 +192,7 @@ static const struct drm_plane_funcs drm_simple_kms_plane_funcs = {
>   * plane-crtc-encoder pipe.
>   * If a connector is supplied, the pipe will be coupled with the provided
>   * connector. You may supply a NULL connector when using drm bridges, that
> - * handle connectors themselves (see drm_simple_display_pipe_bridge_attach()).
> + * handle connectors themselves (see drm_simple_display_pipe_attach_bridge()).
>   * Teardown of a simple display pipe is all handled automatically by the drm
>   * core through calling drm_mode_config_cleanup(). Drivers afterwards need to
>   * release the memory for the structure themselves.
> diff --git a/include/drm/drm_simple_kms_helper.h b/include/drm/drm_simple_kms_helper.h
> index 2690397..5245d1f 100644
> --- a/include/drm/drm_simple_kms_helper.h
> +++ b/include/drm/drm_simple_kms_helper.h
> @@ -85,6 +85,11 @@ struct drm_simple_display_pipe {
>  	const struct drm_simple_display_pipe_funcs *funcs;
>  };
>  
> +int drm_simple_display_pipe_attach_bridge(struct drm_simple_display_pipe *pipe,
> +					struct drm_bridge *bridge);
> +
> +void drm_simple_display_pipe_detach_bridge(struct drm_simple_display_pipe *pipe);
> +
>  int drm_simple_display_pipe_init(struct drm_device *dev,
>  			struct drm_simple_display_pipe *pipe,
>  			const struct drm_simple_display_pipe_funcs *funcs,
> -- 
> 2.7.4
> 

-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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