On Wed, May 01, 2024 at 09:16:33AM +0100, Peter Hoyes wrote: > From: Peter Hoyes <peter.ho...@arm.com> > > Polling cntpct_el0 in a tight loop for delays is inefficient. > This is particularly apparent on Arm FVPs, which do not simulate > real time, meaning that a 1s sleep can take a couple of orders > of magnitude longer to execute in wall time. > > If running at EL2 or above (where CNTHCTL_EL2 is available), enable > the cntpct_el0 event stream temporarily and use wfe to implement > the delay more efficiently. The event period is chosen as a > trade-off between efficiency and the fact that Arm FVPs do not > typically simulate real time. > > This is only implemented for Armv8 boards, where an architectural > timer exists, and only enabled by default for the ARCH_VEXPRESS64 > board family. > > Signed-off-by: Peter Hoyes <peter.ho...@arm.com> > Reviewed-by: Andre Przywara <andre.przyw...@arm.com>
Applied to u-boot/next, thanks! -- Tom
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