Quoting Gregory CLEMENT (2018-06-29 07:44:02) > Hi, > > On mar., juin 19 2018, Gregory CLEMENT <gregory.clement@xxxxxxxxxxx> wrote: > > > Switching the CPU from the L2 or L3 frequencies (300 and 200 Mhz > > respectively) to L0 frequency (1.2 Ghz) requires a significant amount > > of time to let VDD stabilize to the appropriate voltage. This amount of > > time is large enough that it cannot be covered by the hardware > > countdown register. Due to this, the CPU might start operating at L0 > > before the voltage is stabilized, leading to CPU stalls. > > > > To work around this problem, we prevent switching directly from the > > L2/L3 frequencies to the L0 frequency, and instead switch to the L1 > > frequency in-between. The sequence therefore becomes: > > > > 1. First switch from L2/L3(200/300MHz) to L1(600MHZ) > > 2. Sleep 20ms for stabling VDD voltage > > 3. Then switch from L1(600MHZ) to L0(1200Mhz). > > Do you have any comment on this fix? > Looks good. Is it crashing right now? I can throw it into clk-fixes if it's fixing pain.
