> As it stands, this query has nothing to do with the actual GPU so > doesn't really belong here. > > It'd be more valuable, and can maybe give better calibration results > than querying the system timestamp separately in userspace, if you > reported all of: > * the system timer value > * the system timer frequency > * the GPU timer value > * the GPU timer frequency (because it _could_ be different in some systems) > * the GPU timer offset
I see, I missed those registers... I will also fix this on my v2 of my Panfrost series. >From my understanding, the GPU timer frequency doesn't have a register so I suppose it would be wired to cntfrq_el0 if CONFIG_ARM_ARCH_TIMER is set, am I correct? Thanks for the review, Mary
