Sam McNally
2020-Sep-01 06:22 UTC
[Nouveau] [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support
From: Hans Verkuil <hans.verkuil at cisco.com>
Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com>
[sammc at 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 at 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
Lyude Paul
2020-Sep-01 18:12 UTC
[Nouveau] [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support
Super minor nitpicks: On Tue, 2020-09-01 at 16:22 +1000, Sam McNally wrote:> From: Hans Verkuil <hans.verkuil at cisco.com> > > Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com> > [sammc at 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 at 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 at 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
Hans Verkuil
2020-Sep-08 08:41 UTC
[Nouveau] [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support
On 01/09/2020 08:22, Sam McNally wrote:> From: Hans Verkuil <hans.verkuil at cisco.com> > > Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com> > [sammc at 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 at 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) > { > } > >
Sam McNally
2020-Sep-09 06:59 UTC
[Nouveau] [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support
On Wed, 2 Sep 2020 at 04:12, Lyude Paul <lyude at redhat.com> wrote:> > Super minor nitpicks: > > On Tue, 2020-09-01 at 16:22 +1000, Sam McNally wrote: > > From: Hans Verkuil <hans.verkuil at cisco.com> > > > > Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com> > > [sammc at 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 at 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 at 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 >
Sam McNally
2020-Sep-09 06:59 UTC
[Nouveau] [PATCH 4/5] drm_dp_cec: add plumbing in preparation for MST support
On Tue, 8 Sep 2020 at 18:41, Hans Verkuil <hverkuil at xs4all.nl> wrote:> > On 01/09/2020 08:22, Sam McNally wrote: > > From: Hans Verkuil <hans.verkuil at cisco.com> > > > > Signed-off-by: Hans Verkuil <hans.verkuil at cisco.com> > > [sammc at 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 at 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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