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drm/connector: Add support for out-of-band hotplug notification (v3)

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[ Upstream commit 72ad49682dde3d9de5708b8699dc8e0b44962322 ]

Add a new drm_connector_oob_hotplug_event() function and
oob_hotplug_event drm_connector_funcs member.

On some hardware a hotplug event notification may come from outside the
display driver / device. An example of this is some USB Type-C setups
where the hardware muxes the DisplayPort data and aux-lines but does
not pass the altmode HPD status bit to the GPU's DP HPD pin.

In cases like this the new drm_connector_oob_hotplug_event() function can
be used to report these out-of-band events.

Changes in v2:
- Make drm_connector_oob_hotplug_event() take a fwnode as argument and
  have it call drm_connector_find_by_fwnode() internally. This allows
  making drm_connector_find_by_fwnode() a drm-internal function and
  avoids code outside the drm subsystem potentially holding on the
  a drm_connector reference for a longer period.

Changes in v3:
- Drop the data argument to the drm_connector_oob_hotplug_event
  function since it is not used atm. This can be re-added later when
  a use for it actually arises.

Tested-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
Reviewed-by: Lyude Paul <lyude@redhat.com>
Link: https://lore.kernel.org/r/20210817215201.795062-5-hdegoede@redhat.com
Stable-dep-of: 89434b069e46 ("usb: typec: altmodes/displayport: Signal hpd low when exiting mode")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Hans de Goede 2021-08-17 23:51:57 +02:00 committed by Ksawlii
parent 372b6dda17
commit 040a07667f
2 changed files with 36 additions and 0 deletions
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27
drivers/gpu/drm/drm_connector.c
View file

@ -2514,6 +2514,33 @@ struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
return found;
}
/**
* drm_connector_oob_hotplug_event - Report out-of-band hotplug event to connector
* @connector: connector to report the event on
*
* On some hardware a hotplug event notification may come from outside the display
* driver / device. An example of this is some USB Type-C setups where the hardware
* muxes the DisplayPort data and aux-lines but does not pass the altmode HPD
* status bit to the GPU's DP HPD pin.
*
* This function can be used to report these out-of-band events after obtaining
* a drm_connector reference through calling drm_connector_find_by_fwnode().
*/
void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode)
{
struct drm_connector *connector;
connector = drm_connector_find_by_fwnode(connector_fwnode);
if (IS_ERR(connector))
return;
if (connector->funcs->oob_hotplug_event)
connector->funcs->oob_hotplug_event(connector);
drm_connector_put(connector);
}
EXPORT_SYMBOL(drm_connector_oob_hotplug_event);
/**
* DOC: Tile group

9
include/drm/drm_connector.h
View file

@ -1030,6 +1030,14 @@ struct drm_connector_funcs {
*/
void (*atomic_print_state)(struct drm_printer *p,
const struct drm_connector_state *state);
/**
* @oob_hotplug_event:
*
* This will get called when a hotplug-event for a drm-connector
* has been received from a source outside the display driver / device.
*/
void (*oob_hotplug_event)(struct drm_connector *connector);
};
/**
@ -1612,6 +1620,7 @@ drm_connector_is_unregistered(struct drm_connector *connector)
DRM_CONNECTOR_UNREGISTERED;
}
void drm_connector_oob_hotplug_event(struct fwnode_handle *connector_fwnode);
const char *drm_get_connector_type_name(unsigned int connector_type);
const char *drm_get_connector_status_name(enum drm_connector_status status);
const char *drm_get_subpixel_order_name(enum subpixel_order order);