[PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[Sam McNally]

From: Hans Verkuil <hans.verkuil@cisco.com>

Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
[sammc@chromium.org:
 - rebased
 - removed polling-related changes
 - moved the calls to drm_dp_cec_(un)set_edid() into the next patch
]
Signed-off-by: Sam McNally <sammc@chromium.org>
---

 .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
 drivers/gpu/drm/drm_dp_cec.c                  | 22 ++++++++++---------
 drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
 drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
 include/drm/drm_dp_helper.h                   |  6 +++--
 5 files changed, 19 insertions(+), 15 deletions(-)

diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
index 461fa4da0a34..6e7075893ec9 100644
--- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
+++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
@@ -419,7 +419,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
 
 	drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
 	drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
-				      &aconnector->base);
+				      &aconnector->base, false);
 
 	if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
 		return;
diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
index 3ab2609f9ec7..04ab7b88055c 100644
--- a/drivers/gpu/drm/drm_dp_cec.c
+++ b/drivers/gpu/drm/drm_dp_cec.c
@@ -14,6 +14,7 @@
 #include <drm/drm_connector.h>
 #include <drm/drm_device.h>
 #include <drm/drm_dp_helper.h>
+#include <drm/drm_dp_mst_helper.h>
 
 /*
  * Unfortunately it turns out that we have a chicken-and-egg situation
@@ -338,8 +339,6 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
 	if (aux->cec.adap) {
 		if (aux->cec.adap->capabilities == cec_caps &&
 		    aux->cec.adap->available_log_addrs == num_las) {
-			/* Unchanged, so just set the phys addr */
-			cec_s_phys_addr_from_edid(aux->cec.adap, edid);
 			goto unlock;
 		}
 		/*
@@ -364,15 +363,16 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
 	if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
 		cec_delete_adapter(aux->cec.adap);
 		aux->cec.adap = NULL;
-	} else {
-		/*
-		 * Update the phys addr for the new CEC adapter. When called
-		 * from drm_dp_cec_register_connector() edid == NULL, so in
-		 * that case the phys addr is just invalidated.
-		 */
-		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
 	}
 unlock:
+	/*
+	 * Update the phys addr for the new CEC adapter. When called
+	 * from drm_dp_cec_register_connector() edid == NULL, so in
+	 * that case the phys addr is just invalidated.
+	 */
+	if (aux->cec.adap && edid) {
+		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
+	}
 	mutex_unlock(&aux->cec.lock);
 }
 EXPORT_SYMBOL(drm_dp_cec_set_edid);
@@ -418,6 +418,7 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
  * drm_dp_cec_register_connector() - register a new connector
  * @aux: DisplayPort AUX channel
  * @connector: drm connector
+ * @is_mst: set to true if this is an MST branch
  *
  * A new connector was registered with associated CEC adapter name and
  * CEC adapter parent device. After registering the name and parent
@@ -425,12 +426,13 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
  * CEC and to register a CEC adapter if that is the case.
  */
 void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
-				   struct drm_connector *connector)
+				   struct drm_connector *connector, bool is_mst)
 {
 	WARN_ON(aux->cec.adap);
 	if (WARN_ON(!aux->transfer))
 		return;
 	aux->cec.connector = connector;
+	aux->cec.is_mst = is_mst;
 	INIT_DELAYED_WORK(&aux->cec.unregister_work,
 			  drm_dp_cec_unregister_work);
 }
diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
index 82b9de274f65..744cb55572f9 100644
--- a/drivers/gpu/drm/i915/display/intel_dp.c
+++ b/drivers/gpu/drm/i915/display/intel_dp.c
@@ -6261,7 +6261,7 @@ intel_dp_connector_register(struct drm_connector *connector)
 	intel_dp->aux.dev = connector->kdev;
 	ret = drm_dp_aux_register(&intel_dp->aux);
 	if (!ret)
-		drm_dp_cec_register_connector(&intel_dp->aux, connector);
+		drm_dp_cec_register_connector(&intel_dp->aux, connector, false);
 	return ret;
 }
 
diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
index 49dd0cbc332f..671a70e95cd1 100644
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -1414,7 +1414,7 @@ nouveau_connector_create(struct drm_device *dev,
 	switch (type) {
 	case DRM_MODE_CONNECTOR_DisplayPort:
 	case DRM_MODE_CONNECTOR_eDP:
-		drm_dp_cec_register_connector(&nv_connector->aux, connector);
+		drm_dp_cec_register_connector(&nv_connector->aux, connector, false);
 		break;
 	}
 
diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
index 85513eeb2196..12bca1b9512b 100644
--- a/include/drm/drm_dp_helper.h
+++ b/include/drm/drm_dp_helper.h
@@ -1495,12 +1495,14 @@ struct drm_connector;
  * @lock: mutex protecting this struct
  * @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
  * @connector: the connector this CEC adapter is associated with
+ * @is_mst: this is an MST branch
  * @unregister_work: unregister the CEC adapter
  */
 struct drm_dp_aux_cec {
 	struct mutex lock;
 	struct cec_adapter *adap;
 	struct drm_connector *connector;
+	bool is_mst;
 	struct delayed_work unregister_work;
 };
 
@@ -1746,7 +1748,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, u32 edid_quirks,
 #ifdef CONFIG_DRM_DP_CEC
 void drm_dp_cec_irq(struct drm_dp_aux *aux);
 void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
-				   struct drm_connector *connector);
+				   struct drm_connector *connector, bool is_mst);
 void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
 void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
 void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
@@ -1757,7 +1759,7 @@ static inline void drm_dp_cec_irq(struct drm_dp_aux *aux)
 
 static inline void
 drm_dp_cec_register_connector(struct drm_dp_aux *aux,
-			      struct drm_connector *connector)
+			      struct drm_connector *connector, bool is_mst)
 {
 }
 
-- 
2.28.0.402.g5ffc5be6b7-goog

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Re: [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[Lyude Paul]

Super minor nitpicks:

On Tue, 2020-09-01 at 16:22 +1000, Sam McNally wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> [sammc@chromium.org:
>  - rebased
>  - removed polling-related changes
>  - moved the calls to drm_dp_cec_(un)set_edid() into the next patch
> ]
> Signed-off-by: Sam McNally <sammc@chromium.org>
> ---
> 
>  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
>  drivers/gpu/drm/drm_dp_cec.c                  | 22 ++++++++++---------
>  drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
>  include/drm/drm_dp_helper.h                   |  6 +++--
>  5 files changed, 19 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 461fa4da0a34..6e7075893ec9 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -419,7 +419,7 @@ void amdgpu_dm_initialize_dp_connector(struct
> amdgpu_display_manager *dm,
>  
>  	drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
>  	drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> -				      &aconnector->base);
> +				      &aconnector->base, false);
>  
>  	if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
>  		return;
> diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
> index 3ab2609f9ec7..04ab7b88055c 100644
> --- a/drivers/gpu/drm/drm_dp_cec.c
> +++ b/drivers/gpu/drm/drm_dp_cec.c
> @@ -14,6 +14,7 @@
>  #include <drm/drm_connector.h>
>  #include <drm/drm_device.h>
>  #include <drm/drm_dp_helper.h>
> +#include <drm/drm_dp_mst_helper.h>
>  
>  /*
>   * Unfortunately it turns out that we have a chicken-and-egg situation
> @@ -338,8 +339,6 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const
> struct edid *edid)
>  	if (aux->cec.adap) {
>  		if (aux->cec.adap->capabilities == cec_caps &&
>  		    aux->cec.adap->available_log_addrs == num_las) {
> -			/* Unchanged, so just set the phys addr */
> -			cec_s_phys_addr_from_edid(aux->cec.adap, edid);
>  			goto unlock;
>  		}

May as well drop the braces here

>  		/*
> @@ -364,15 +363,16 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const
> struct edid *edid)
>  	if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
>  		cec_delete_adapter(aux->cec.adap);
>  		aux->cec.adap = NULL;
> -	} else {
> -		/*
> -		 * Update the phys addr for the new CEC adapter. When called
> -		 * from drm_dp_cec_register_connector() edid == NULL, so in
> -		 * that case the phys addr is just invalidated.
> -		 */
> -		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
>  	}
>  unlock:
> +	/*
> +	 * Update the phys addr for the new CEC adapter. When called
> +	 * from drm_dp_cec_register_connector() edid == NULL, so in
> +	 * that case the phys addr is just invalidated.
> +	 */
> +	if (aux->cec.adap && edid) {
> +		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> +	}

And here

>  	mutex_unlock(&aux->cec.lock);
>  }
>  EXPORT_SYMBOL(drm_dp_cec_set_edid);
> @@ -418,6 +418,7 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
>   * drm_dp_cec_register_connector() - register a new connector
>   * @aux: DisplayPort AUX channel
>   * @connector: drm connector
> + * @is_mst: set to true if this is an MST branch
>   *
>   * A new connector was registered with associated CEC adapter name and
>   * CEC adapter parent device. After registering the name and parent
> @@ -425,12 +426,13 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
>   * CEC and to register a CEC adapter if that is the case.
>   */
>  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -				   struct drm_connector *connector)
> +				   struct drm_connector *connector, bool is_mst)
>  {
>  	WARN_ON(aux->cec.adap);
>  	if (WARN_ON(!aux->transfer))
>  		return;
>  	aux->cec.connector = connector;
> +	aux->cec.is_mst = is_mst;

Also JFYI, you can also check aux->is_remote, but maybe you've got another
reason for copying this here

Either way:

Reviewed-by: Lyude Paul <lyude@redhat.com>

...Also, maybe this is just a coincidence - but do I know your name from
somewhere? Perhaps an IRC community from long ago?

>  	INIT_DELAYED_WORK(&aux->cec.unregister_work,
>  			  drm_dp_cec_unregister_work);
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 82b9de274f65..744cb55572f9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6261,7 +6261,7 @@ intel_dp_connector_register(struct drm_connector
> *connector)
>  	intel_dp->aux.dev = connector->kdev;
>  	ret = drm_dp_aux_register(&intel_dp->aux);
>  	if (!ret)
> -		drm_dp_cec_register_connector(&intel_dp->aux, connector);
> +		drm_dp_cec_register_connector(&intel_dp->aux, connector, false);
>  	return ret;
>  }
>  
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c
> b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 49dd0cbc332f..671a70e95cd1 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -1414,7 +1414,7 @@ nouveau_connector_create(struct drm_device *dev,
>  	switch (type) {
>  	case DRM_MODE_CONNECTOR_DisplayPort:
>  	case DRM_MODE_CONNECTOR_eDP:
> -		drm_dp_cec_register_connector(&nv_connector->aux, connector);
> +		drm_dp_cec_register_connector(&nv_connector->aux, connector,
> false);
>  		break;
>  	}
>  
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 85513eeb2196..12bca1b9512b 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1495,12 +1495,14 @@ struct drm_connector;
>   * @lock: mutex protecting this struct
>   * @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
>   * @connector: the connector this CEC adapter is associated with
> + * @is_mst: this is an MST branch
>   * @unregister_work: unregister the CEC adapter
>   */
>  struct drm_dp_aux_cec {
>  	struct mutex lock;
>  	struct cec_adapter *adap;
>  	struct drm_connector *connector;
> +	bool is_mst;
>  	struct delayed_work unregister_work;
>  };
>  
> @@ -1746,7 +1748,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, u32
> edid_quirks,
>  #ifdef CONFIG_DRM_DP_CEC
>  void drm_dp_cec_irq(struct drm_dp_aux *aux);
>  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -				   struct drm_connector *connector);
> +				   struct drm_connector *connector, bool
> is_mst);
>  void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
>  void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
>  void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
> @@ -1757,7 +1759,7 @@ static inline void drm_dp_cec_irq(struct drm_dp_aux
> *aux)
>  
>  static inline void
>  drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -			      struct drm_connector *connector)
> +			      struct drm_connector *connector, bool is_mst)
>  {
>  }
>  
-- 
Sincerely,
      Lyude Paul (she/her)
      Software Engineer at Red Hat

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Re: [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[Sam McNally]

On Wed, 2 Sep 2020 at 04:12, Lyude Paul <lyude@redhat.com> wrote:
>
> Super minor nitpicks:
>
> On Tue, 2020-09-01 at 16:22 +1000, Sam McNally wrote:
> > From: Hans Verkuil <hans.verkuil@cisco.com>
> >
> > Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> > [sammc@chromium.org:
> >  - rebased
> >  - removed polling-related changes
> >  - moved the calls to drm_dp_cec_(un)set_edid() into the next patch
> > ]
> > Signed-off-by: Sam McNally <sammc@chromium.org>
> > ---
> >
> >  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
> >  drivers/gpu/drm/drm_dp_cec.c                  | 22 ++++++++++---------
> >  drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
> >  drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
> >  include/drm/drm_dp_helper.h                   |  6 +++--
> >  5 files changed, 19 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > index 461fa4da0a34..6e7075893ec9 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > @@ -419,7 +419,7 @@ void amdgpu_dm_initialize_dp_connector(struct
> > amdgpu_display_manager *dm,
> >
> >       drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
> >       drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> > -                                   &aconnector->base);
> > +                                   &aconnector->base, false);
> >
> >       if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
> >               return;
> > diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
> > index 3ab2609f9ec7..04ab7b88055c 100644
> > --- a/drivers/gpu/drm/drm_dp_cec.c
> > +++ b/drivers/gpu/drm/drm_dp_cec.c
> > @@ -14,6 +14,7 @@
> >  #include <drm/drm_connector.h>
> >  #include <drm/drm_device.h>
> >  #include <drm/drm_dp_helper.h>
> > +#include <drm/drm_dp_mst_helper.h>
> >
> >  /*
> >   * Unfortunately it turns out that we have a chicken-and-egg situation
> > @@ -338,8 +339,6 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const
> > struct edid *edid)
> >       if (aux->cec.adap) {
> >               if (aux->cec.adap->capabilities == cec_caps &&
> >                   aux->cec.adap->available_log_addrs == num_las) {
> > -                     /* Unchanged, so just set the phys addr */
> > -                     cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> >                       goto unlock;
> >               }
>
> May as well drop the braces here
>
> >               /*
> > @@ -364,15 +363,16 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const
> > struct edid *edid)
> >       if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
> >               cec_delete_adapter(aux->cec.adap);
> >               aux->cec.adap = NULL;
> > -     } else {
> > -             /*
> > -              * Update the phys addr for the new CEC adapter. When called
> > -              * from drm_dp_cec_register_connector() edid == NULL, so in
> > -              * that case the phys addr is just invalidated.
> > -              */
> > -             cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> >       }
> >  unlock:
> > +     /*
> > +      * Update the phys addr for the new CEC adapter. When called
> > +      * from drm_dp_cec_register_connector() edid == NULL, so in
> > +      * that case the phys addr is just invalidated.
> > +      */
> > +     if (aux->cec.adap && edid) {
> > +             cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> > +     }
>
> And here
>
> >       mutex_unlock(&aux->cec.lock);
> >  }
> >  EXPORT_SYMBOL(drm_dp_cec_set_edid);
> > @@ -418,6 +418,7 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
> >   * drm_dp_cec_register_connector() - register a new connector
> >   * @aux: DisplayPort AUX channel
> >   * @connector: drm connector
> > + * @is_mst: set to true if this is an MST branch
> >   *
> >   * A new connector was registered with associated CEC adapter name and
> >   * CEC adapter parent device. After registering the name and parent
> > @@ -425,12 +426,13 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
> >   * CEC and to register a CEC adapter if that is the case.
> >   */
> >  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                                struct drm_connector *connector)
> > +                                struct drm_connector *connector, bool is_mst)
> >  {
> >       WARN_ON(aux->cec.adap);
> >       if (WARN_ON(!aux->transfer))
> >               return;
> >       aux->cec.connector = connector;
> > +     aux->cec.is_mst = is_mst;
>
> Also JFYI, you can also check aux->is_remote, but maybe you've got another
> reason for copying this here
>

I think this was just an artefact of this patch originally being
written before aux->is_remote was added. Switching to it mostly
removes the need for this patch, and leaving drm_dp_cec_set_edid()
unchanged, as Hans suggests, removes the rest.

> Either way:
>
> Reviewed-by: Lyude Paul <lyude@redhat.com>
>
> ...Also, maybe this is just a coincidence - but do I know your name from
> somewhere? Perhaps an IRC community from long ago?
>

Not that I can think of; it's probably just a coincidence.

> >       INIT_DELAYED_WORK(&aux->cec.unregister_work,
> >                         drm_dp_cec_unregister_work);
> >  }
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> > b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 82b9de274f65..744cb55572f9 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -6261,7 +6261,7 @@ intel_dp_connector_register(struct drm_connector
> > *connector)
> >       intel_dp->aux.dev = connector->kdev;
> >       ret = drm_dp_aux_register(&intel_dp->aux);
> >       if (!ret)
> > -             drm_dp_cec_register_connector(&intel_dp->aux, connector);
> > +             drm_dp_cec_register_connector(&intel_dp->aux, connector, false);
> >       return ret;
> >  }
> >
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c
> > b/drivers/gpu/drm/nouveau/nouveau_connector.c
> > index 49dd0cbc332f..671a70e95cd1 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> > @@ -1414,7 +1414,7 @@ nouveau_connector_create(struct drm_device *dev,
> >       switch (type) {
> >       case DRM_MODE_CONNECTOR_DisplayPort:
> >       case DRM_MODE_CONNECTOR_eDP:
> > -             drm_dp_cec_register_connector(&nv_connector->aux, connector);
> > +             drm_dp_cec_register_connector(&nv_connector->aux, connector,
> > false);
> >               break;
> >       }
> >
> > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > index 85513eeb2196..12bca1b9512b 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1495,12 +1495,14 @@ struct drm_connector;
> >   * @lock: mutex protecting this struct
> >   * @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
> >   * @connector: the connector this CEC adapter is associated with
> > + * @is_mst: this is an MST branch
> >   * @unregister_work: unregister the CEC adapter
> >   */
> >  struct drm_dp_aux_cec {
> >       struct mutex lock;
> >       struct cec_adapter *adap;
> >       struct drm_connector *connector;
> > +     bool is_mst;
> >       struct delayed_work unregister_work;
> >  };
> >
> > @@ -1746,7 +1748,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, u32
> > edid_quirks,
> >  #ifdef CONFIG_DRM_DP_CEC
> >  void drm_dp_cec_irq(struct drm_dp_aux *aux);
> >  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                                struct drm_connector *connector);
> > +                                struct drm_connector *connector, bool
> > is_mst);
> >  void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
> >  void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
> >  void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
> > @@ -1757,7 +1759,7 @@ static inline void drm_dp_cec_irq(struct drm_dp_aux
> > *aux)
> >
> >  static inline void
> >  drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                           struct drm_connector *connector)
> > +                           struct drm_connector *connector, bool is_mst)
> >  {
> >  }
> >
> --
> Sincerely,
>       Lyude Paul (she/her)
>       Software Engineer at Red Hat
>
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Re: [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[Hans Verkuil]

On 01/09/2020 08:22, Sam McNally wrote:
> From: Hans Verkuil <hans.verkuil@cisco.com>
> 
> Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> [sammc@chromium.org:
>  - rebased
>  - removed polling-related changes
>  - moved the calls to drm_dp_cec_(un)set_edid() into the next patch
> ]
> Signed-off-by: Sam McNally <sammc@chromium.org>
> ---
> 
>  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
>  drivers/gpu/drm/drm_dp_cec.c                  | 22 ++++++++++---------
>  drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
>  drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
>  include/drm/drm_dp_helper.h                   |  6 +++--
>  5 files changed, 19 insertions(+), 15 deletions(-)
> 
> diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> index 461fa4da0a34..6e7075893ec9 100644
> --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> @@ -419,7 +419,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
>  
>  	drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
>  	drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> -				      &aconnector->base);
> +				      &aconnector->base, false);
>  
>  	if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
>  		return;
> diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
> index 3ab2609f9ec7..04ab7b88055c 100644
> --- a/drivers/gpu/drm/drm_dp_cec.c
> +++ b/drivers/gpu/drm/drm_dp_cec.c
> @@ -14,6 +14,7 @@
>  #include <drm/drm_connector.h>
>  #include <drm/drm_device.h>
>  #include <drm/drm_dp_helper.h>
> +#include <drm/drm_dp_mst_helper.h>
>  
>  /*
>   * Unfortunately it turns out that we have a chicken-and-egg situation
> @@ -338,8 +339,6 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
>  	if (aux->cec.adap) {
>  		if (aux->cec.adap->capabilities == cec_caps &&
>  		    aux->cec.adap->available_log_addrs == num_las) {
> -			/* Unchanged, so just set the phys addr */
> -			cec_s_phys_addr_from_edid(aux->cec.adap, edid);
>  			goto unlock;
>  		}
>  		/*
> @@ -364,15 +363,16 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
>  	if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
>  		cec_delete_adapter(aux->cec.adap);
>  		aux->cec.adap = NULL;
> -	} else {
> -		/*
> -		 * Update the phys addr for the new CEC adapter. When called
> -		 * from drm_dp_cec_register_connector() edid == NULL, so in
> -		 * that case the phys addr is just invalidated.
> -		 */
> -		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
>  	}
>  unlock:
> +	/*
> +	 * Update the phys addr for the new CEC adapter. When called
> +	 * from drm_dp_cec_register_connector() edid == NULL, so in
> +	 * that case the phys addr is just invalidated.
> +	 */

The comment is no longer in sync with the code: if EDID == NULL, then
nothing is done due to the edid check in the 'if' below.

> +	if (aux->cec.adap && edid) {

I think this should just be: if (aux->cec.adap)

Also, the {} aren't necessary here.

> +		cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> +	}
>  	mutex_unlock(&aux->cec.lock);
>  }
>  EXPORT_SYMBOL(drm_dp_cec_set_edid);

Frankly, the changes to this function should be dropped completely, from
what I can see they are not necessary. It was done in my original patch
because of the way I handled mst, but you did it differently (and I think
better), so these changes are no longer needed.

I know I am actually commenting on my old patch, but that patch was from a
work-in-progress git branch and was never meant as a 'proper' patch.

However, what complicates matters is that after digging a bit more I discovered
that commit 732300154980 ("drm: Do not call drm_dp_cec_set_edid() while registering
DP connectors") changed drm_dp_cec_register_connector() so that it no longer
calls drm_dp_cec_set_edid(), but the comments there and in this function were
not updated. It would be nice if you can add a patch fixing these outdated
comments.

Regardless of that change in commit 732300154980, the edid pointer can still be
NULL and the existing behavior should be kept (i.e. create a CEC device, but with
an invalid physical address since there is no EDID for some reason).

Regards,

	Hans

> @@ -418,6 +418,7 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
>   * drm_dp_cec_register_connector() - register a new connector
>   * @aux: DisplayPort AUX channel
>   * @connector: drm connector
> + * @is_mst: set to true if this is an MST branch
>   *
>   * A new connector was registered with associated CEC adapter name and
>   * CEC adapter parent device. After registering the name and parent
> @@ -425,12 +426,13 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
>   * CEC and to register a CEC adapter if that is the case.
>   */
>  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -				   struct drm_connector *connector)
> +				   struct drm_connector *connector, bool is_mst)
>  {
>  	WARN_ON(aux->cec.adap);
>  	if (WARN_ON(!aux->transfer))
>  		return;
>  	aux->cec.connector = connector;
> +	aux->cec.is_mst = is_mst;
>  	INIT_DELAYED_WORK(&aux->cec.unregister_work,
>  			  drm_dp_cec_unregister_work);
>  }
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 82b9de274f65..744cb55572f9 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -6261,7 +6261,7 @@ intel_dp_connector_register(struct drm_connector *connector)
>  	intel_dp->aux.dev = connector->kdev;
>  	ret = drm_dp_aux_register(&intel_dp->aux);
>  	if (!ret)
> -		drm_dp_cec_register_connector(&intel_dp->aux, connector);
> +		drm_dp_cec_register_connector(&intel_dp->aux, connector, false);
>  	return ret;
>  }
>  
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 49dd0cbc332f..671a70e95cd1 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -1414,7 +1414,7 @@ nouveau_connector_create(struct drm_device *dev,
>  	switch (type) {
>  	case DRM_MODE_CONNECTOR_DisplayPort:
>  	case DRM_MODE_CONNECTOR_eDP:
> -		drm_dp_cec_register_connector(&nv_connector->aux, connector);
> +		drm_dp_cec_register_connector(&nv_connector->aux, connector, false);
>  		break;
>  	}
>  
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 85513eeb2196..12bca1b9512b 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1495,12 +1495,14 @@ struct drm_connector;
>   * @lock: mutex protecting this struct
>   * @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
>   * @connector: the connector this CEC adapter is associated with
> + * @is_mst: this is an MST branch
>   * @unregister_work: unregister the CEC adapter
>   */
>  struct drm_dp_aux_cec {
>  	struct mutex lock;
>  	struct cec_adapter *adap;
>  	struct drm_connector *connector;
> +	bool is_mst;
>  	struct delayed_work unregister_work;
>  };
>  
> @@ -1746,7 +1748,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, u32 edid_quirks,
>  #ifdef CONFIG_DRM_DP_CEC
>  void drm_dp_cec_irq(struct drm_dp_aux *aux);
>  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -				   struct drm_connector *connector);
> +				   struct drm_connector *connector, bool is_mst);
>  void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
>  void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
>  void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
> @@ -1757,7 +1759,7 @@ static inline void drm_dp_cec_irq(struct drm_dp_aux *aux)
>  
>  static inline void
>  drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> -			      struct drm_connector *connector)
> +			      struct drm_connector *connector, bool is_mst)
>  {
>  }
>  
> 

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Re: [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support

[Sam McNally]

On Tue, 8 Sep 2020 at 18:41, Hans Verkuil <hverkuil@xs4all.nl> wrote:
>
> On 01/09/2020 08:22, Sam McNally wrote:
> > From: Hans Verkuil <hans.verkuil@cisco.com>
> >
> > Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com>
> > [sammc@chromium.org:
> >  - rebased
> >  - removed polling-related changes
> >  - moved the calls to drm_dp_cec_(un)set_edid() into the next patch
> > ]
> > Signed-off-by: Sam McNally <sammc@chromium.org>
> > ---
> >
> >  .../display/amdgpu_dm/amdgpu_dm_mst_types.c   |  2 +-
> >  drivers/gpu/drm/drm_dp_cec.c                  | 22 ++++++++++---------
> >  drivers/gpu/drm/i915/display/intel_dp.c       |  2 +-
> >  drivers/gpu/drm/nouveau/nouveau_connector.c   |  2 +-
> >  include/drm/drm_dp_helper.h                   |  6 +++--
> >  5 files changed, 19 insertions(+), 15 deletions(-)
> >
> > diff --git a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > index 461fa4da0a34..6e7075893ec9 100644
> > --- a/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > +++ b/drivers/gpu/drm/amd/display/amdgpu_dm/amdgpu_dm_mst_types.c
> > @@ -419,7 +419,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
> >
> >       drm_dp_aux_init(&aconnector->dm_dp_aux.aux);
> >       drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> > -                                   &aconnector->base);
> > +                                   &aconnector->base, false);
> >
> >       if (aconnector->base.connector_type == DRM_MODE_CONNECTOR_eDP)
> >               return;
> > diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
> > index 3ab2609f9ec7..04ab7b88055c 100644
> > --- a/drivers/gpu/drm/drm_dp_cec.c
> > +++ b/drivers/gpu/drm/drm_dp_cec.c
> > @@ -14,6 +14,7 @@
> >  #include <drm/drm_connector.h>
> >  #include <drm/drm_device.h>
> >  #include <drm/drm_dp_helper.h>
> > +#include <drm/drm_dp_mst_helper.h>
> >
> >  /*
> >   * Unfortunately it turns out that we have a chicken-and-egg situation
> > @@ -338,8 +339,6 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
> >       if (aux->cec.adap) {
> >               if (aux->cec.adap->capabilities == cec_caps &&
> >                   aux->cec.adap->available_log_addrs == num_las) {
> > -                     /* Unchanged, so just set the phys addr */
> > -                     cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> >                       goto unlock;
> >               }
> >               /*
> > @@ -364,15 +363,16 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
> >       if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
> >               cec_delete_adapter(aux->cec.adap);
> >               aux->cec.adap = NULL;
> > -     } else {
> > -             /*
> > -              * Update the phys addr for the new CEC adapter. When called
> > -              * from drm_dp_cec_register_connector() edid == NULL, so in
> > -              * that case the phys addr is just invalidated.
> > -              */
> > -             cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> >       }
> >  unlock:
> > +     /*
> > +      * Update the phys addr for the new CEC adapter. When called
> > +      * from drm_dp_cec_register_connector() edid == NULL, so in
> > +      * that case the phys addr is just invalidated.
> > +      */
>
> The comment is no longer in sync with the code: if EDID == NULL, then
> nothing is done due to the edid check in the 'if' below.
>
> > +     if (aux->cec.adap && edid) {
>
> I think this should just be: if (aux->cec.adap)
>
> Also, the {} aren't necessary here.
>
> > +             cec_s_phys_addr_from_edid(aux->cec.adap, edid);
> > +     }
> >       mutex_unlock(&aux->cec.lock);
> >  }
> >  EXPORT_SYMBOL(drm_dp_cec_set_edid);
>
> Frankly, the changes to this function should be dropped completely, from
> what I can see they are not necessary. It was done in my original patch
> because of the way I handled mst, but you did it differently (and I think
> better), so these changes are no longer needed.
>
> I know I am actually commenting on my old patch, but that patch was from a
> work-in-progress git branch and was never meant as a 'proper' patch.
>
> However, what complicates matters is that after digging a bit more I discovered
> that commit 732300154980 ("drm: Do not call drm_dp_cec_set_edid() while registering
> DP connectors") changed drm_dp_cec_register_connector() so that it no longer
> calls drm_dp_cec_set_edid(), but the comments there and in this function were
> not updated. It would be nice if you can add a patch fixing these outdated
> comments.
>
> Regardless of that change in commit 732300154980, the edid pointer can still be
> NULL and the existing behavior should be kept (i.e. create a CEC device, but with
> an invalid physical address since there is no EDID for some reason).
>
> Regards,
>
>         Hans
>

Thanks. Leaving drm_dp_cec_set_edid() unchanged combined with Lyude's
suggestion to use aux->is_remote removes the need for this patch
entirely.

> > @@ -418,6 +418,7 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
> >   * drm_dp_cec_register_connector() - register a new connector
> >   * @aux: DisplayPort AUX channel
> >   * @connector: drm connector
> > + * @is_mst: set to true if this is an MST branch
> >   *
> >   * A new connector was registered with associated CEC adapter name and
> >   * CEC adapter parent device. After registering the name and parent
> > @@ -425,12 +426,13 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
> >   * CEC and to register a CEC adapter if that is the case.
> >   */
> >  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                                struct drm_connector *connector)
> > +                                struct drm_connector *connector, bool is_mst)
> >  {
> >       WARN_ON(aux->cec.adap);
> >       if (WARN_ON(!aux->transfer))
> >               return;
> >       aux->cec.connector = connector;
> > +     aux->cec.is_mst = is_mst;
> >       INIT_DELAYED_WORK(&aux->cec.unregister_work,
> >                         drm_dp_cec_unregister_work);
> >  }
> > diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> > index 82b9de274f65..744cb55572f9 100644
> > --- a/drivers/gpu/drm/i915/display/intel_dp.c
> > +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> > @@ -6261,7 +6261,7 @@ intel_dp_connector_register(struct drm_connector *connector)
> >       intel_dp->aux.dev = connector->kdev;
> >       ret = drm_dp_aux_register(&intel_dp->aux);
> >       if (!ret)
> > -             drm_dp_cec_register_connector(&intel_dp->aux, connector);
> > +             drm_dp_cec_register_connector(&intel_dp->aux, connector, false);
> >       return ret;
> >  }
> >
> > diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> > index 49dd0cbc332f..671a70e95cd1 100644
> > --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> > +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> > @@ -1414,7 +1414,7 @@ nouveau_connector_create(struct drm_device *dev,
> >       switch (type) {
> >       case DRM_MODE_CONNECTOR_DisplayPort:
> >       case DRM_MODE_CONNECTOR_eDP:
> > -             drm_dp_cec_register_connector(&nv_connector->aux, connector);
> > +             drm_dp_cec_register_connector(&nv_connector->aux, connector, false);
> >               break;
> >       }
> >
> > diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> > index 85513eeb2196..12bca1b9512b 100644
> > --- a/include/drm/drm_dp_helper.h
> > +++ b/include/drm/drm_dp_helper.h
> > @@ -1495,12 +1495,14 @@ struct drm_connector;
> >   * @lock: mutex protecting this struct
> >   * @adap: the CEC adapter for CEC-Tunneling-over-AUX support.
> >   * @connector: the connector this CEC adapter is associated with
> > + * @is_mst: this is an MST branch
> >   * @unregister_work: unregister the CEC adapter
> >   */
> >  struct drm_dp_aux_cec {
> >       struct mutex lock;
> >       struct cec_adapter *adap;
> >       struct drm_connector *connector;
> > +     bool is_mst;
> >       struct delayed_work unregister_work;
> >  };
> >
> > @@ -1746,7 +1748,7 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, u32 edid_quirks,
> >  #ifdef CONFIG_DRM_DP_CEC
> >  void drm_dp_cec_irq(struct drm_dp_aux *aux);
> >  void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                                struct drm_connector *connector);
> > +                                struct drm_connector *connector, bool is_mst);
> >  void drm_dp_cec_unregister_connector(struct drm_dp_aux *aux);
> >  void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid);
> >  void drm_dp_cec_unset_edid(struct drm_dp_aux *aux);
> > @@ -1757,7 +1759,7 @@ static inline void drm_dp_cec_irq(struct drm_dp_aux *aux)
> >
> >  static inline void
> >  drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> > -                           struct drm_connector *connector)
> > +                           struct drm_connector *connector, bool is_mst)
> >  {
> >  }
> >
> >
>
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