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SubjectRe: [RFC PATCH v2] media: cec: DRM connector to CEC dev mapping
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Hi Dariusz,

This is much closer to what I am looking for, but it can be simplified a bit more:

On 4/9/19 9:33 AM, Dariusz Marcinkiewicz wrote:
> This patch proposes to introduce explicit mapping between DRM connectors
> and /dev/cecX adapters.
>
> This is achieved here by adding a new structure with connector info
> (card number and connector id in case of DRM connectors) to cec_adapter.
> That connector info is expected to be set either by a code creating
> an adapter or trough a CEC notifier (which is extended for that purpose).
>
> New ioctl, exposing connector info to userland, is added to /dev/cec.
>
> Changes since v1:
> - removed the unnecessary event,
> - extended cec_connctor_info to allow for various types of connectors.
>
> Signed-off-by: Dariusz Marcinkiewicz <darekm@google.com>
> ---
> .../display/amdgpu_dm/amdgpu_dm_mst_types.c | 2 +-
> drivers/gpu/drm/drm_dp_cec.c | 24 +++++++++-----
> drivers/gpu/drm/i915/intel_dp.c | 5 ++-
> drivers/gpu/drm/i915/intel_hdmi.c | 11 ++++++-
> drivers/gpu/drm/nouveau/nouveau_connector.c | 3 +-
> drivers/media/cec/cec-adap.c | 7 +++++
> drivers/media/cec/cec-api.c | 11 +++++++
> drivers/media/cec/cec-core.c | 3 ++
> drivers/media/cec/cec-notifier.c | 19 +++++++++++-
> include/drm/drm_dp_helper.h | 14 ++++-----
> include/media/cec-notifier.h | 31 +++++++++++++++++--
> include/media/cec.h | 11 ++++++-
> include/uapi/linux/cec.h | 24 ++++++++++++++
> 13 files changed, 139 insertions(+), 26 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 c4ea3a91f17aa..41678df654cdc 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
> @@ -379,7 +379,7 @@ void amdgpu_dm_initialize_dp_connector(struct amdgpu_display_manager *dm,
>
> drm_dp_aux_register(&aconnector->dm_dp_aux.aux);
> drm_dp_cec_register_connector(&aconnector->dm_dp_aux.aux,
> - aconnector->base.name, dm->adev->dev);
> + &aconnector->base);
> aconnector->mst_mgr.cbs = &dm_mst_cbs;
> drm_dp_mst_topology_mgr_init(
> &aconnector->mst_mgr,
> diff --git a/drivers/gpu/drm/drm_dp_cec.c b/drivers/gpu/drm/drm_dp_cec.c
> index b15cee85b702b..c92aca0ff6320 100644
> --- a/drivers/gpu/drm/drm_dp_cec.c
> +++ b/drivers/gpu/drm/drm_dp_cec.c
> @@ -8,7 +8,9 @@
> #include <linux/kernel.h>
> #include <linux/module.h>
> #include <linux/slab.h>
> +#include <drm/drm_connector.h>
> #include <drm/drm_dp_helper.h>
> +#include <drm/drmP.h>
> #include <media/cec.h>
>
> /*
> @@ -295,6 +297,7 @@ static void drm_dp_cec_unregister_work(struct work_struct *work)
> */
> void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
> {
> + struct drm_connector *connector = aux->cec.connector;
> u32 cec_caps = CEC_CAP_DEFAULTS | CEC_CAP_NEEDS_HPD;
> unsigned int num_las = 1;
> u8 cap;
> @@ -344,16 +347,23 @@ void drm_dp_cec_set_edid(struct drm_dp_aux *aux, const struct edid *edid)
>
> /* Create a new adapter */
> aux->cec.adap = cec_allocate_adapter(&drm_dp_cec_adap_ops,
> - aux, aux->cec.name, cec_caps,
> + aux, connector->name, cec_caps,
> num_las);
> if (IS_ERR(aux->cec.adap)) {
> aux->cec.adap = NULL;
> goto unlock;
> }
> - if (cec_register_adapter(aux->cec.adap, aux->cec.parent)) {
> + if (cec_register_adapter(aux->cec.adap, connector->dev->dev)) {
> cec_delete_adapter(aux->cec.adap);
> aux->cec.adap = NULL;
> } else {
> + struct cec_connector_info info;
> +
> + info.type = CEC_CONNECTOR_TYPE_DRM;
> + info.drm.card_no = connector->dev->primary->index;
> + info.drm.connector_id = connector->base.id;
> + cec_s_connector_info(aux->cec.adap, connector);

Don't add this new function, just pass the information as an argument to
cec_allocate_adapter. That way the adapter information is correct before
the cec device is registered.

If there is no connector information, then just pass NULL to cec_allocate_adapter().

> +
> /*
> * Update the phys addr for the new CEC adapter. When called
> * from drm_dp_cec_register_connector() edid == NULL, so in
> @@ -406,22 +416,20 @@ EXPORT_SYMBOL(drm_dp_cec_unset_edid);
> /**
> * drm_dp_cec_register_connector() - register a new connector
> * @aux: DisplayPort AUX channel
> - * @name: name of the CEC device
> - * @parent: parent device
> + * @connector: drm connector
> *
> * A new connector was registered with associated CEC adapter name and
> * CEC adapter parent device. After registering the name and parent
> * drm_dp_cec_set_edid() is called to check if the connector supports
> * CEC and to register a CEC adapter if that is the case.
> */
> -void drm_dp_cec_register_connector(struct drm_dp_aux *aux, const char *name,
> - struct device *parent)
> +void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> + struct drm_connector *connector)
> {
> WARN_ON(aux->cec.adap);
> if (WARN_ON(!aux->transfer))
> return;
> - aux->cec.name = name;
> - aux->cec.parent = parent;
> + aux->cec.connector = connector;
> INIT_DELAYED_WORK(&aux->cec.unregister_work,
> drm_dp_cec_unregister_work);
> }
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index cf709835fb9a9..1d451999c4cc1 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5542,7 +5542,6 @@ static int
> intel_dp_connector_register(struct drm_connector *connector)
> {
> struct intel_dp *intel_dp = intel_attached_dp(connector);
> - struct drm_device *dev = connector->dev;
> int ret;
>
> ret = intel_connector_register(connector);
> @@ -5557,8 +5556,7 @@ 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->name, dev->dev);
> + drm_dp_cec_register_connector(&intel_dp->aux, connector);
> return ret;
> }
>
> @@ -7107,3 +7105,4 @@ void intel_dp_mst_resume(struct drm_i915_private *dev_priv)
> }
> }
> }
> +
> diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
> index f125a62eba8cf..228f58f568ef1 100644
> --- a/drivers/gpu/drm/i915/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/intel_hdmi.c
> @@ -2448,8 +2448,17 @@ void intel_hdmi_init_connector(struct intel_digital_port *intel_dig_port,
>
> intel_hdmi->cec_notifier = cec_notifier_get_conn(dev->dev,
> port_identifier(port));
> - if (!intel_hdmi->cec_notifier)
> + if (intel_hdmi->cec_notifier) {
> + struct cec_connector_info info;
> +
> + info.type = CEC_CONNECTOR_TYPE_DRM;
> + info.drm.card_no = connector->dev->primary->index;
> + info.drm.connector_id = connector->base.id;
> + cec_notifier_set_connector_info(intel_hdmi->cec_notifier,
> + &info);

Same here: the connector info should be passed as an argument to cec_notifier_get_conn()
and stored in the cec_notifier struct.

The CEC driver calls cec_notifier_get() and can then pass the connector_info to the
cec_allocate_adapter() call.

> + } else {
> DRM_DEBUG_KMS("CEC notifier get failed\n");
> + }
> }
>
> void intel_hdmi_init(struct drm_i915_private *dev_priv,
> diff --git a/drivers/gpu/drm/nouveau/nouveau_connector.c b/drivers/gpu/drm/nouveau/nouveau_connector.c
> index 4116ee62adafe..4438824ca88b0 100644
> --- a/drivers/gpu/drm/nouveau/nouveau_connector.c
> +++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
> @@ -1413,8 +1413,7 @@ 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->name, dev->dev);
> + drm_dp_cec_register_connector(&nv_connector->aux, connector);
> break;
> }
>
> diff --git a/drivers/media/cec/cec-adap.c b/drivers/media/cec/cec-adap.c
> index f1261cc2b6fa5..88f42c5e8512f 100644
> --- a/drivers/media/cec/cec-adap.c
> +++ b/drivers/media/cec/cec-adap.c
> @@ -1566,6 +1566,13 @@ void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
> }
> EXPORT_SYMBOL_GPL(cec_s_phys_addr_from_edid);
>
> +void cec_s_connector_info(struct cec_adapter *adap,
> + struct cec_connector_info *info)
> +{
> + memcpy(&adap->connector, info, sizeof(*info));
> +}
> +EXPORT_SYMBOL_GPL(cec_s_connector_info);
> +
> /*
> * Called from either the ioctl or a driver to set the logical addresses.
> *
> diff --git a/drivers/media/cec/cec-api.c b/drivers/media/cec/cec-api.c
> index 156a0d76ab2a1..0394a77d5bb5c 100644
> --- a/drivers/media/cec/cec-api.c
> +++ b/drivers/media/cec/cec-api.c
> @@ -187,6 +187,14 @@ static long cec_adap_s_log_addrs(struct cec_adapter *adap, struct cec_fh *fh,
> return 0;
> }
>
> +static long cec_adap_g_connector_info(struct cec_adapter *adap,
> + struct cec_connector_info __user *parg)
> +{
> + if (copy_to_user(parg, &adap->connector, sizeof(adap->connector)))
> + return -EFAULT;
> + return 0;
> +}
> +
> static long cec_transmit(struct cec_adapter *adap, struct cec_fh *fh,
> bool block, struct cec_msg __user *parg)
> {
> @@ -514,6 +522,9 @@ static long cec_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
> case CEC_ADAP_S_LOG_ADDRS:
> return cec_adap_s_log_addrs(adap, fh, block, parg);
>
> + case CEC_ADAP_G_CONNECTOR_INFO:
> + return cec_adap_g_connector_info(adap, parg);
> +
> case CEC_TRANSMIT:
> return cec_transmit(adap, fh, block, parg);
>
> diff --git a/drivers/media/cec/cec-core.c b/drivers/media/cec/cec-core.c
> index cc875dabd7658..7b0e28263195a 100644
> --- a/drivers/media/cec/cec-core.c
> +++ b/drivers/media/cec/cec-core.c
> @@ -195,6 +195,9 @@ void cec_register_cec_notifier(struct cec_adapter *adap,
>
> adap->notifier = notifier;
> cec_notifier_register(adap->notifier, adap, cec_cec_notify);
> +
> + cec_s_connector_info(adap,
> + cec_notifier_get_connector_info(notifier));
> }
> EXPORT_SYMBOL_GPL(cec_register_cec_notifier);
> #endif
> diff --git a/drivers/media/cec/cec-notifier.c b/drivers/media/cec/cec-notifier.c
> index dd2078b27a419..a3c172ee0999b 100644
> --- a/drivers/media/cec/cec-notifier.c
> +++ b/drivers/media/cec/cec-notifier.c
> @@ -26,6 +26,7 @@ struct cec_notifier {
> void (*callback)(struct cec_adapter *adap, u16 pa);
>
> u16 phys_addr;
> + struct cec_connector_info connector_info;
> };
>
> static LIST_HEAD(cec_notifiers);
> @@ -51,6 +52,7 @@ struct cec_notifier *cec_notifier_get_conn(struct device *dev, const char *conn)
> if (conn)
> n->conn = kstrdup(conn, GFP_KERNEL);
> n->phys_addr = CEC_PHYS_ADDR_INVALID;
> + n->connector_info.type = CEC_CONNECTOR_TYPE_NO_CONNECTOR;
> mutex_init(&n->lock);
> kref_init(&n->kref);
> list_add_tail(&n->head, &cec_notifiers);
> @@ -106,9 +108,24 @@ void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
> }
> EXPORT_SYMBOL_GPL(cec_notifier_set_phys_addr_from_edid);
>
> +void cec_notifier_set_connector_info(struct cec_notifier *n,
> + struct cec_connector_info *c)
> +{
> + memcpy(&n->connector_info, c, sizeof(*c));
> +}
> +EXPORT_SYMBOL_GPL(cec_notifier_set_connector_info);
> +
> +struct cec_connector_info *cec_notifier_get_connector_info(
> + struct cec_notifier *n)
> +{
> + return &n->connector_info;
> +}
> +EXPORT_SYMBOL_GPL(cec_notifier_get_connector_info);
> +
> void cec_notifier_register(struct cec_notifier *n,
> struct cec_adapter *adap,
> - void (*callback)(struct cec_adapter *adap, u16 pa))
> + void (*callback)(struct cec_adapter *adap,
> + u16 pa))
> {
> kref_get(&n->kref);
> mutex_lock(&n->lock);
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 97ce790a5b5aa..ded0ff01f2ac7 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1208,6 +1208,7 @@ struct drm_dp_aux_msg {
>
> struct cec_adapter;
> struct edid;
> +struct drm_connector;
>
> /**
> * struct drm_dp_aux_cec - DisplayPort CEC-Tunneling-over-AUX
> @@ -1220,8 +1221,7 @@ struct edid;
> struct drm_dp_aux_cec {
> struct mutex lock;
> struct cec_adapter *adap;
> - const char *name;
> - struct device *parent;
> + struct drm_connector *connector;
> struct delayed_work unregister_work;
> };
>
> @@ -1418,8 +1418,8 @@ drm_dp_has_quirk(const struct drm_dp_desc *desc, enum drm_dp_quirk quirk)
>
> #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, const char *name,
> - struct device *parent);
> +void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> + struct drm_connector *connector);
> 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);
> @@ -1428,9 +1428,9 @@ 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,
> - const char *name,
> - struct device *parent)
> +static inline
> +void drm_dp_cec_register_connector(struct drm_dp_aux *aux,
> + struct drm_connector *connector)
> {
> }
>
> diff --git a/include/media/cec-notifier.h b/include/media/cec-notifier.h
> index 814eeef35a5cf..f6a7572920f3f 100644
> --- a/include/media/cec-notifier.h
> +++ b/include/media/cec-notifier.h
> @@ -63,6 +63,21 @@ void cec_notifier_set_phys_addr(struct cec_notifier *n, u16 pa);
> void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
> const struct edid *edid);
>
> +/**
> + * cec_notifier_get_connector_info - get connector info associatied with
> + * a notifier
> + * @n: the CEC notifier
> + */
> +struct cec_connector_info *cec_notifier_get_connector_info(
> + struct cec_notifier *n);
> +
> +/**
> + * cec_notifier_set_connector_info - associates connector info with a notifier
> + * @n: the CEC notifier
> + * @c: the connector info
> + */
> +void cec_notifier_set_connector_info(struct cec_notifier *n,
> + struct cec_connector_info *c);
> /**
> * cec_notifier_register - register a callback with the notifier
> * @n: the CEC notifier
> @@ -108,9 +123,21 @@ static inline void cec_notifier_set_phys_addr_from_edid(struct cec_notifier *n,
> {
> }
>
> +const struct cec_connector_info*
> + cec_notifier_get_connector_info(struct cec_notifier *n)
> +{
> + return (struct cec_connector_info *)0xdeadfeed;
> +}
> +
> +static inline void cec_notifier_set_connector_info(
> + struct cec_notifier *n,
> + struct cec_connector_info *c)
> +{
> +}
> +
> static inline void cec_notifier_register(struct cec_notifier *n,
> - struct cec_adapter *adap,
> - void (*callback)(struct cec_adapter *adap, u16 pa))
> + struct cec_adapter *adap,
> + void (*callback)(struct cec_adapter *adap, u16 pa))
> {
> }
>
> diff --git a/include/media/cec.h b/include/media/cec.h
> index 707411ef8ba28..b19b6efb4a23a 100644
> --- a/include/media/cec.h
> +++ b/include/media/cec.h
> @@ -200,6 +200,8 @@ struct cec_adapter {
> u32 sequence;
>
> char input_phys[32];
> +
> + struct cec_connector_info connector;
> };
>
> static inline void *cec_get_drvdata(const struct cec_adapter *adap)
> @@ -247,9 +249,11 @@ void cec_s_phys_addr(struct cec_adapter *adap, u16 phys_addr,
> bool block);
> void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
> const struct edid *edid);
> +void cec_s_connector_info(struct cec_adapter *adap,
> + struct cec_connector_info *connector);
> +
> int cec_transmit_msg(struct cec_adapter *adap, struct cec_msg *msg,
> bool block);
> -
> /* Called by the adapter */
> void cec_transmit_done_ts(struct cec_adapter *adap, u8 status,
> u8 arb_lost_cnt, u8 nack_cnt, u8 low_drive_cnt,
> @@ -357,6 +361,11 @@ static inline void cec_s_phys_addr_from_edid(struct cec_adapter *adap,
> {
> }
>
> +void cec_s_connector_info(struct cec_adapter *adap, int card_no,
> + u32 connector_id)
> +{
> +}
> +
> static inline u16 cec_get_edid_phys_addr(const u8 *edid, unsigned int size,
> unsigned int *offset)
> {
> diff --git a/include/uapi/linux/cec.h b/include/uapi/linux/cec.h
> index 3094af68b6e76..618ef95ce79a1 100644
> --- a/include/uapi/linux/cec.h
> +++ b/include/uapi/linux/cec.h
> @@ -411,6 +411,27 @@ struct cec_event_lost_msgs {
> __u32 lost_msgs;
> };
>
> +/**
> + * struct cec_event_connector - tells if and which connector is associated
> + * with the CEC adapter.
> + * @card_no: drm card number, -1 if no connector
> + * @connector_id: drm connector id.
> + */
> +struct cec_drm_connector_info {
> + int card_no;
> + __u32 connector_id;
> +};
> +
> +#define CEC_CONNECTOR_TYPE_NO_CONNECTOR 0
> +#define CEC_CONNECTOR_TYPE_DRM 1
> +struct cec_connector_info {
> + int type;
> + union {
> + struct cec_drm_connector_info drm;
> + __u32 raw[16];
> + };
> +};
> +
> /**
> * struct cec_event - CEC event structure
> * @ts: the timestamp of when the event was sent.
> @@ -475,6 +496,9 @@ struct cec_event {
> #define CEC_G_MODE _IOR('a', 8, __u32)
> #define CEC_S_MODE _IOW('a', 9, __u32)
>
> +/* Gets the connector info */
> +#define CEC_ADAP_G_CONNECTOR_INFO _IOR('a', 10, struct cec_connector_info)
> +
> /*
> * The remainder of this header defines all CEC messages and operands.
> * The format matters since it the cec-ctl utility parses it to generate
>

Regards,

Hans

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