[PATCH 0/9] drm + usb-type-c: Add support for out-of-band hotplug notification

[Hans de Goede]

Hi,

On 4/28/21 11:52 PM, Hans de Goede wrote:
> Hi All,
> 
> Here is a new attempt to make DP over Type-C work on devices where the
> Type-C controller does not drive the HPD pin on the GPU, but instead
> we need to forward HPD events from the Type-C controller to the DRM driver.
> 
> For anyone interested here are the old (2019!) patches for this:
> 
> https://patchwork.freedesktop.org/patch/288491/
> https://patchwork.freedesktop.org/patch/288493/
> https://patchwork.freedesktop.org/patch/288495/
> 
> Last time I posted this the biggest change requested was for more info to
> be included in the event send to the DRM-subsystem, specifically sending
> the following info was requested:
> 
> 1. Which DP connector on the GPU the event is for
> 2. How many lanes are available
> 3. Connector orientation
> 
> This series is basically an entirely new approach, which no longer
> uses the notifier framework at all. Instead the Type-C code looksup
> a connector based on a fwnode (this was suggested by Heikki Krogerus)
> and then calls a new oob_hotplug_event drm_connector_func directly
> on the connector, passing the requested info as argument.

p.s.

Info such as the orientation and the number of dp-lanes is now passed
to the drm_connector_oob_hotplug_event() function as requested in the
review of the old code, but nothing is done with it for now.
Using this info falls well outside of my knowledge of the i915 driver
so this is left to a follow-up patch (I will be available to test
patches for this).

Regards,

Hans