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tests/pm_rps: quiescent harder

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Apparently some rps chips are prone to stick to max once you're there.
And all the synchronous waits in gem_quiescent_gpu are _really_ good
at forcing the kernel to go full throttle.

And even a positively tiny load (one MI_STORE_IMM per 50 ms) is enough
to eternally keeep it there, which means the first idle measurement of
the freqs before we do the reset it completely busted.

Just add a wait before the tricky test and call it a day.

Option b) would have been to now have this tiny load, but I think a
good reminder how quirky rps is is always welcome. Just in case we
start sleeping too easy at night.

Bugzilla: https://bugs.freedesktop.org/show_bug.cgi?id=74956
Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch>
This commit is contained in:
Daniel Vetter 2014-03-26 21:30:17 +01:00
parent 896b550984
commit 669a2fca6c
1 changed files with 6 additions and 0 deletions
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6
tests/pm_rps.c
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@ -488,6 +488,12 @@ static void reset(void)
int pre_freqs[NUMFREQ];
int post_freqs[NUMFREQ];
/*
* quiescent_gpu upsets the gpu and makes it get pegged to max somehow.
* Don't ask.
*/
sleep(10);
igt_debug("Apply low load...\n");
load_helper_run(LOW);
stabilize_check(pre_freqs);