Am Dienstag, den 18.12.2018, 08:24 -0200 schrieb Fabio Estevam: > Hi Anson, > > On Tue, Dec 18, 2018 at 12:56 AM Anson Huang <[email protected]> > wrote: > > > > On i.MX8M, some of the bus clocks' rate could be changed in TF-A, > > Do you mean ATF (ARM Trusted Firmware) instead?
TF-A is the name of the day for what was formerly known as ATF... However I don't think that it's correct to just don't cache the clock settings. Normally the secure world firmware should not change any clock settings at runtime, or it would run into all kinds of conflicts with the clock driver. So there are probably some well known points in time like a suspend or resume event when the firmware might change clock settings, so we could instead use those to trigger an explicit invalidate of the clock caches with much lower overhead. Regards, Lucas
