Re: [PATCH] clocksource/drivers/sh_cmt: wait for CMCNT on init

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Hi Biju,

On Wed, Oct 10, 2018 at 11:50 AM Biju Das <biju.das@xxxxxxxxxxxxxx> wrote:
> > > Note:-
> > >
> > > For R-Car M3-W board, inconsistency-check and nanosleep tests are
> > working fine.
> > >
> > > However  there is a failure with clocksource_switch  "asynchronous"  test.
> > > The inconsistency-check is failing  for "arch_sys_counter" after some
> > > clocksource_switch operations
> > >
> > > So I skipped the "clocksource_switching"  for  arch_sys_counter  and
> > > the asynchronous test is passing for
> > > CMT0/1/2/3 timers.
> >
> > Sorry, being no timer expert, I don't understand the impact of the above
> > paragraph.
>
> We may start a discussion on this, when we start upstreaming CMT for R-Car M3-W devices.
>
> Basically clocksource_switch  test in "selftests "uses 2 threads,
> In 1 thread it executes inconsistency-check test followed by nano sleep test
> and on the  second thread it keep changing clock source one after the another.
>
> This test always fails  on R-Car M3-W which is based on arm64.

Sergei already enabled CMT on R-Car V3M and V3H, perhaps he has seen
similar issues?

Gr{oetje,eeting}s,

                        Geert

-- 
Geert Uytterhoeven -- There's lots of Linux beyond ia32 -- geert@xxxxxxxxxxxxxx

In personal conversations with technical people, I call myself a hacker. But
when I'm talking to journalists I just say "programmer" or something like that.
                                -- Linus Torvalds



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