Thanks, Martin. I'll try to follow up on this next week and get you an answer. What GPUs have you observed this on?
On Fri, Sep 18, 2015 at 11:13:53PM +0300, Martin Peres wrote: > Hello, > > We recently reverse engineered PWM-based voltage management but found an > odity in the input clock frequency for the PWM controller. It seems like RM > is assuming an input clock of 27.648 MHz instead of the actual 27MHz crystal > found on the board. > > I thus have the following questions: > - Is it a fixed value hardcoded in RM? (Current way it is done in Nouveau) > - Should we use crystal_MHz * 1.024? > > I could spend some time hooking up my osciloscope to the VR to check if it > is a bringup issue but it would not help Nouveau much as we need to > reproduce the behaviour of RM anyway since this is the only validated > configuration. > > Thanks in advance, > Martin > > PS: The registers for this PWM controller are 0x20340 and 0x20344. _______________________________________________ Nouveau mailing list [email protected] http://lists.freedesktop.org/mailman/listinfo/nouveau
