On Wed, May 30, 2018 at 09:31:55AM -0700, Doug Anderson wrote: > On Wed, May 30, 2018 at 9:13 AM, Mark Brown <broo...@kernel.org> wrote:
> > If we're just going to use the most recently set voltage then hopefully > > the hardware already knew that, and it might not be the lowest available > > voltage if the last consumer to get turned off was holding the voltage > > higher. > To circle back to the original point: the problem is that (IMHO) the > hardware is doing the wrong thing by still counting Linux's vote for a > voltage even though Linux also voted that the regulator should be > disabled. So basically we're working around the hardware by > pretending to vote for a dummy lower voltage whenever Linux wants the > regulator disabled. From Linux's point of view everything works as > normal--we just tell the hardware a falsehood so it doesn't count our > vote for a voltage while the regulator is disabled. Yeah, and I don't think that's unreasonable for the core to do - just drop the voltage to the constraint minimum after it has turned off the regulator, then recheck and raise if needed before it enables again.
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