[PATCH v2 00/13] drm: Add generic helpers for HDMI scrambling

[Daniel Vetter]

On Fri, Nov 26, 2021 at 04:43:49PM +0100, Maxime Ripard wrote:
> Hi Daniel,
> 
> On Fri, Nov 19, 2021 at 05:01:14PM +0100, Daniel Vetter wrote:
> > On Thu, Nov 18, 2021 at 11:38:01AM +0100, Maxime Ripard wrote:
> > > This is a follow-up of the work to support the interactions between the hotplug
> > > and the scrambling support for vc4:
> > > 
> > > https://lore.kernel.org/dri-devel/20210507150515.257424-11-maxime@cerno.tech/
> > > https://lore.kernel.org/dri-devel/20211025152903.1088803-10-maxime@cerno.tech/
> > > 
> > > Ville feedback was that the same discussion happened some time ago for i915,
> > > and resulted in a function to do an full disable/enable cycle on reconnection
> > > to avoid breaking the HDMI 2.0 spec.
> > > 
> > > This series improves the current scrambling support by adding generic helpers
> > > for usual scrambling-related operations, and builds upon them to provide a
> > > generic alternative to intel_hdmi_reset_link.
> > 
> > Out of curiosity, can we rebuild intel_hdmi_reset_link on top of these?
> > Always better to have two drivers to actually show the helpers help, than
> > just one.
> 
> Unfortunately, I don't have any Intel system I can test it on, and it
> looks like the changes wouldn't be trivial.
> 
> Maybe we can use dw-hdmi instead?

Hm I guess so, maybe Ville can be motivated. Just figured since this seems
at least inspired by i915 code.

Also we have CI running on intel-gfx, so if you just type well enough it
generally works out and CI catches anything you got wrong. Christian König
is pretty good at not breaking i915 with all the dma-buf and ttm changes
nowadays, much better than random arm socs dying.
-Daniel
-- 
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch