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

[Maxime Ripard]

On Fri, Nov 26, 2021 at 06:12:42PM +0100, Daniel Vetter wrote:
> 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.

It's not really the conversion to the new helper that I suspect would be
hard to do, but rather the usage of the connector state that we do, and
the scrambling computation, and how it's all tied together in i915.

It seems to be fairly different from drivers that just rely on the
atomic helpers, and I'm not really confident about changing that. But
yeah, I guess I can give it a try and rely on the CI.

Maxime
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