From: Hans de Goede <hdegoede@redhat.com>
To: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>,
Maxime Ripard <mripard@kernel.org>,
Thomas Zimmermann <tzimmermann@suse.de>,
Daniel Vetter <daniel@ffwll.ch>, David Airlie <airlied@linux.ie>,
Jani Nikula <jani.nikula@linux.intel.com>,
Joonas Lahtinen <joonas.lahtinen@linux.intel.com>,
Rodrigo Vivi <rodrigo.vivi@intel.com>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Guenter Roeck <linux@roeck-us.net>,
Heikki Krogerus <heikki.krogerus@linux.intel.com>
Cc: Hans de Goede <hdegoede@redhat.com>,
intel-gfx <intel-gfx@lists.freedesktop.org>,
dri-devel@lists.freedesktop.org,
platform-driver-x86@vger.kernel.org, linux-usb@vger.kernel.org
Subject: [PATCH 3/9] drm/connector: Add drm_connector_find_by_fwnode() function
Date: Wed, 28 Apr 2021 23:52:51 +0200 [thread overview]
Message-ID: <20210428215257.500088-4-hdegoede@redhat.com> (raw)
In-Reply-To: <20210428215257.500088-1-hdegoede@redhat.com>
Add a function which allows other subsystems to find a connector
based on a fwnode.
This will be used by the USB-Type-C code to be able to find the DP
connector to which to send hotplug events received by a Type-C port in
DP-alternate-mode.
Note this function is defined in drivers/gpu/drm/drm_sysfs.c because it
needs access to the drm_sysfs_device_connector device_type struct.
Signed-off-by: Hans de Goede <hdegoede@redhat.com>
---
drivers/gpu/drm/drm_sysfs.c | 38 +++++++++++++++++++++++++++++++++++++
include/drm/drm_connector.h | 1 +
2 files changed, 39 insertions(+)
diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
index c1d3e2b843b7..ca71c46fad78 100644
--- a/drivers/gpu/drm/drm_sysfs.c
+++ b/drivers/gpu/drm/drm_sysfs.c
@@ -520,3 +520,41 @@ void drm_class_device_unregister(struct device *dev)
return device_unregister(dev);
}
EXPORT_SYMBOL_GPL(drm_class_device_unregister);
+
+/**
+ * drm_connector_find_by_fwnode - Find a connector based on the associated fwnode
+ * @fwnode: fwnode for which to find the matching drm_connector
+ *
+ * This functions looks up a drm_connector based on its associated fwnode. When
+ * a connector is found a reference to the connector is returned. The caller must
+ * call drm_connector_put() to release this reference when it is done with the
+ * connector.
+ *
+ * Returns: A reference to the found connector or NULL if no matching connector was found
+ */
+struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *fwnode)
+{
+ struct drm_connector *connector, *found = NULL;
+ struct class_dev_iter iter;
+ struct device *dev;
+
+ if (!fwnode)
+ return NULL;
+
+ class_dev_iter_init(&iter, drm_class, NULL, &drm_sysfs_device_connector);
+ while ((dev = class_dev_iter_next(&iter))) {
+ connector = to_drm_connector(dev);
+
+ if ((connector->fwnode == fwnode) ||
+ (connector->fwnode && connector->fwnode->secondary == fwnode)) {
+ drm_connector_get(connector);
+ found = connector;
+ break;
+ }
+
+ }
+ class_dev_iter_exit(&iter);
+
+ return found;
+}
+EXPORT_SYMBOL(drm_connector_find_by_fwnode);
diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
index d20bfd7576ed..1e5d154d1f4a 100644
--- a/include/drm/drm_connector.h
+++ b/include/drm/drm_connector.h
@@ -1696,6 +1696,7 @@ drm_connector_is_unregistered(struct drm_connector *connector)
DRM_CONNECTOR_UNREGISTERED;
}
+struct drm_connector *drm_connector_find_by_fwnode(struct fwnode_handle *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);
--
2.31.1
next prev parent reply other threads:[~2021-04-28 21:53 UTC|newest]
Thread overview: 27+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-28 21:52 [PATCH 0/9] drm + usb-type-c: Add support for out-of-band hotplug notification Hans de Goede
2021-04-28 21:52 ` [PATCH 1/9] drm/connector: Make the drm_sysfs connector->kdev device hold a reference to the connector Hans de Goede
2021-04-29 11:40 ` Daniel Vetter
2021-04-29 11:54 ` Greg Kroah-Hartman
2021-04-29 12:04 ` Daniel Vetter
2021-04-29 12:33 ` Hans de Goede
2021-04-29 19:09 ` Daniel Vetter
2021-04-30 11:28 ` Hans de Goede
2021-04-30 11:38 ` Daniel Vetter
2021-04-30 13:32 ` Hans de Goede
2021-04-30 14:30 ` Daniel Vetter
2021-04-30 13:45 ` Hans de Goede
2021-04-29 12:30 ` Hans de Goede
2021-04-28 21:52 ` [PATCH 2/9] drm/connector: Add a fwnode pointer to drm_connector and register with ACPI Hans de Goede
2021-04-28 21:52 ` Hans de Goede [this message]
2021-04-28 21:52 ` [PATCH 4/9] drm/connector: Add support for out-of-band hotplug notification Hans de Goede
2021-05-03 8:00 ` Heikki Krogerus
2021-05-03 14:35 ` Hans de Goede
2021-05-04 14:52 ` Heikki Krogerus
2021-05-04 15:34 ` Hans de Goede
2021-05-04 12:53 ` Imre Deak
2021-04-28 21:52 ` [PATCH 5/9] drm/i915: Associate ACPI connector nodes with connector entries Hans de Goede
2021-04-28 21:52 ` [PATCH 6/9] drm/i915/dp: Add support for out-of-bound hotplug events Hans de Goede
2021-04-28 21:52 ` [PATCH 7/9] usb: typec: altmodes/displayport: Make dp_altmode_notify() more generic Hans de Goede
2021-04-28 21:52 ` [PATCH 8/9] usb: typec: altmodes/displayport: Notify drm subsys of hotplug events Hans de Goede
2021-04-28 21:52 ` [PATCH 9/9] platform/x86/intel_cht_int33fe: Correct "displayport" fwnode reference Hans de Goede
2021-04-28 21:57 ` [PATCH 0/9] drm + usb-type-c: Add support for out-of-band hotplug notification Hans de Goede
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