PATCH] drm/i915/display/dp: Remove UHBR13.5 for icl

[Murthy, Arun R]

> -----Original Message-----
> From: Nikula, Jani <jani.nikula at intel.com>
> Sent: Wednesday, May 8, 2024 5:18 PM
> To: Murthy, Arun R <arun.r.murthy at intel.com>; Ville Syrjälä
> <ville.syrjala at linux.intel.com>
> Cc: intel-gfx at lists.freedesktop.org
> Subject: RE: [PATCH] drm/i915/display/dp: Remove UHBR13.5 for icl
> 
> On Wed, 08 May 2024, "Murthy, Arun R" <arun.r.murthy at intel.com> wrote:
> >> -----Original Message-----
> >> From: Nikula, Jani <jani.nikula at intel.com>
> >> Sent: Wednesday, May 8, 2024 3:29 PM
> >> To: Murthy, Arun R <arun.r.murthy at intel.com>; Ville Syrjälä
> >> <ville.syrjala at linux.intel.com>
> >> Cc: intel-gfx at lists.freedesktop.org
> >> Subject: RE: [PATCH] drm/i915/display/dp: Remove UHBR13.5 for icl
> >>
> >> On Wed, 08 May 2024, "Murthy, Arun R" <arun.r.murthy at intel.com> wrote:
> >> > This is the limitation from the retimer hardware.
> >>
> >> The commit message needs to reflect this.
> >>
> >> Do all units have a retimer with the limitation? Or could you have a
> >> DG2 without the limitation? Do we need to check for that instead of
> >> blanket removal of UHBR 13.5 for DG2?
> >>
> > Changed the commit msg as below
> >
> > Display 12+ hardware supports UHBR13.5
> 
> Not true.
> 
> > but due to the retimer constraints platform doesn't support UHBR13.5.
> 
> Which platform?
> 
> > This is the same for mtl and UHBR13.5 is removed as part of the commit
> > caf3d748f646 ("drm/i915/dp: Remove support for UHBR13.5") This patch
> removes UHBR13.5 support for icl/dg2.
> 
> ICL does not support UHBR 13.5.
> 

Per bspec display12+ has uhbr13.5 Due to the retimer constraint none of the Intel platforms supports UHBR13.5
Uhbr15.3 is already removed for mtl platform as part of commit caf3d748f646 ("drm/i915/dp: Remove support for UHBR13.5") this patch will remove for dg2.

Thanks and Regards,
Arun R Murthy
--------------------
> BR,
> Jani.
> 
> >
> > Thanks and Regards,
> > Arun R Murthy
> > --------------------
> >> BR,
> >> Jani.
> >>
> >>
> >> --
> >> Jani Nikula, Intel
> 
> --
> Jani Nikula, Intel