Hi,
On Wed, Jun 09, 2021 at 09:23:27PM +0000, Simon Ser wrote:
> This function sends a hotplug uevent with a CONNECTOR property.
>
> Signed-off-by: Simon Ser <contact@xxxxxxxxxxx>
> ---
> drivers/gpu/drm/drm_sysfs.c | 25 +++++++++++++++++++++++++
> include/drm/drm_sysfs.h | 1 +
> 2 files changed, 26 insertions(+)
>
> diff --git a/drivers/gpu/drm/drm_sysfs.c b/drivers/gpu/drm/drm_sysfs.c
> index 968a9560b4aa..8423e44c3035 100644
> --- a/drivers/gpu/drm/drm_sysfs.c
> +++ b/drivers/gpu/drm/drm_sysfs.c
> @@ -343,6 +343,31 @@ void drm_sysfs_hotplug_event(struct drm_device *dev)
> }
> EXPORT_SYMBOL(drm_sysfs_hotplug_event);
>
> +/**
> + * drm_sysfs_connector_hotplug_event - generate a DRM uevent for any connector
> + * change
> + * @connector: connector which has changed
> + *
> + * Send a uevent for the DRM connector specified by @connector. This will send
> + * a uevent with the properties HOTPLUG=1 and CONNECTOR.
> + */
> +void drm_sysfs_connector_hotplug_event(struct drm_connector *connector)
> +{
> + struct drm_device *dev = connector->dev;
> + char hotplug_str[] = "HOTPLUG=1", conn_id[21];
> + char *envp[] = { hotplug_str, conn_id, NULL };
> +
> + snprintf(conn_id, sizeof(conn_id),
> + "CONNECTOR=%u", connector->base.id);
> +
> + drm_dbg_kms(connector->dev,
> + "[CONNECTOR:%d:%s] generating connector hotplug event\n",
> + connector->base.id, connector->name);
> +
> + kobject_uevent_env(&dev->primary->kdev->kobj, KOBJ_CHANGE, envp);
> +}
> +EXPORT_SYMBOL(drm_sysfs_connector_hotplug_event);
Would it make sense to call sysfs_notify on the status file?
It would allow to call poll() on the status file in sysfs and skipping
udev in simple cases?
Maxime
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