On Tue, 27 Jun 2023, "Murthy, Arun R" <arun.r.murthy@xxxxxxxxx> wrote: >> -----Original Message----- >> From: Nikula, Jani <jani.nikula@xxxxxxxxx> >> Sent: Monday, June 26, 2023 6:02 PM >> To: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>; intel- >> gfx@xxxxxxxxxxxxxxxxxxxxx >> Cc: Deak, Imre <imre.deak@xxxxxxxxx>; Kahola, Mika >> <mika.kahola@xxxxxxxxx> >> Subject: RE: [PATCH] drm/i915/display/dp: Remove support for UHBR13.5 >> >> On Thu, 22 Jun 2023, "Murthy, Arun R" <arun.r.murthy@xxxxxxxxx> wrote: >> >> -----Original Message----- >> >> From: Nikula, Jani <jani.nikula@xxxxxxxxx> >> >> Sent: Wednesday, June 21, 2023 2:27 PM >> >> To: Murthy, Arun R <arun.r.murthy@xxxxxxxxx>; intel- >> >> gfx@xxxxxxxxxxxxxxxxxxxxx >> >> Cc: Deak, Imre <imre.deak@xxxxxxxxx>; Kahola, Mika >> >> <mika.kahola@xxxxxxxxx>; Murthy, Arun R <arun.r.murthy@xxxxxxxxx> >> >> Subject: Re: [PATCH] drm/i915/display/dp: Remove support for UHBR13.5 >> >> >> >> On Tue, 20 Jun 2023, Arun R Murthy <arun.r.murthy@xxxxxxxxx> wrote: >> >> > As per the DP2.1 Spec support for UHBR13.5 is optional. Hence >> >> > removing the support for UHBR13.5 >> >> >> >> That's just not a proper rationale. Please explain. >> >> >> > Programming for UHBR10 and UHBR20 is similar compared to UHBR13.5 As >> > of now we have validated 10Gbps and 20Gbps. The spec also points out >> > when 20Gbps is supported 13.5Gbps is optional so we have not >> validated/implemented the UHBR13.5 Now we have the DP2.1 compatible >> panel is market, expecting users can come up with UHBR13.5 not working. >> Hence removing the support for 13.5Gbps for now. >> > Maybe once we have support for UHBR13.5 in the driver we can enable >> this. >> >> What's missing? >> > Port clock programming, pll values differs. > This table has been in place but some corrections/recheck required. Can we do that instead please? I accidentally stumbled on the relevant gitlab issue [1] (please add this kind of information up front in the future), so we have a reporter that could test the fixes. BR, Jani. [1] https://gitlab.freedesktop.org/drm/intel/-/issues/8686 > > Thanks and Regards, > Arun R Murthy > -------------------- -- Jani Nikula, Intel Open Source Graphics Center
