Hi,
On 9.05.2016 22:36, Tony Lindgren wrote:
* Ivaylo Dimitrov <ivo.g.dimitrov.75@xxxxxxxxx> [160507 08:24]:
once omap_dm_timer_start() is called, which calls omap_dm_timer_enable()
and thus pm_runtime_get_sync(), it doesn't make sense to call PM runtime
functions again before omap_dm_timer_stop is called(). Otherwise PM runtime
functions called in omap_dm_timer_enable/disable lead to long and unneeded
delays.
Fix that by implementing an "enabled" counter, so the PM runtime functions
get called only when really needed.
Without that patch Nokia N900 IR TX driver (ir-rx51) does not function.
Well, I just tested again, with the $subject patch reverted and
contradictory to my own words, it worked just fine. I believe the reason
is that I did hrtimer "migration" after I did the $subject patch. I was
thinking the reason for the slow transmission was PWM dmtimer, but now
it turns out it has been the "pulse" dmtimer. So, I think the $subject
patch should be dropped.
We should use pm_runtime for the refcounting though and call PM runtime
unconditionally. Can you try to follow the standard PM runtime usage
like this:
It works without that, but on the other hand, I finally have some
reference on how PM runtime API should be called :).
init:
pm_runtime_use_autosuspend(&timer->pdev->dev);
pm_runtime_set_autosuspend_delay(&timer->pdev->dev, 200);
pm_runtime_enable(&timer->pdev->dev);
...
enable:
pm_runtime_get_sync(&timer->pdev->dev);
...
disable:
pm_runtime_mark_last_busy(&timer->pdev->dev);
pm_runtime_put_autosuspend(&timer->pdev->dev);
...
exit:
pm_runtime_dont_use_autosuspend(&timer->pdev->dev);
pm_runtime_put_sync(&timer->pdev->dev);
pm_runtime_disable(&timer->pdev->dev);
No idea what the timeout should be, maybe less than 200 ms. Also we need
to test that off idle still works with timer1, that might need special
handling.
Thanks,
Ivo
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