On Fri, 2019-09-20 at 22:29 +0100, Chris Wilson wrote: > Quoting Summers, Stuart (2019-09-20 22:09:46) > > On Thu, 2019-09-19 at 08:00 +0100, Tvrtko Ursulin wrote: > > > On 18/09/2019 18:31, Stuart Summers wrote: > > > > Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=110559 > > > > > > Unless there was some discussion I missed we can't just turn it > > > on > > > to > > > work around a SKIP in IGT. Feature was deliberately limited to > > > Icelake > > > and even there just to a sub-set of possible configurations. > > > > No conversation was missed, or at least none I was a part of. Is > > there > > a reason we don't allow this on future platforms? > > > > We do claim powergate support on TGL, so I assumed it would be good > > to > > take this path on that platform. Maybe I'm misunderstanding > > something > > here though. > > The current interface is purely to work around a silicon issue on > icl. > It was not developed into a fully reconfigurable sseu interface > mostly > due to a lack of demonstrable need and a lack of appreciation of the > tradeoffs between different system users (along with the claim that > this > is all meant to be handled by instructions in the command stream...). > Another team did try to autoadjust sseu but also did not produce the > rationale nor attempt to integrate with the existing code. Ok that makes sense then and thanks for the explanations here. Please consider my patch dropped :) -Stuart > -Chris
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