On 11/23/2017 05:06 AM, Ladislav Michl wrote:
On Thu, Nov 23, 2017 at 11:26:04AM +0100, Ladislav Michl wrote:
On Thu, Nov 23, 2017 at 10:35:42AM +0100, Ladislav Michl wrote:
On Thu, Nov 16, 2017 at 03:04:48PM -0600, Grygorii Strashko wrote:
[snip]
I recommend to disable CPU idle completely in config and re-check test,
before continue with other things.
Strangely enough latency is much worse with CONFIG_CPU_IDLE disabled.
While it is better with:
CONFIG_HZ_PERIODIC=y
CONFIG_CPU_FREQ=n
CONFIG_PM=n
But both ehci and musb does not see any device connected and:
[snip]
The culprit here is CONFIG_PM. With CONFIG_PM disabled latency jitter is
about 30us, which is pretty good for general purpose OS. But some drivers
do not work without CONFIG_PM. Suggestions?
Not sure OMAP ever expected to fully work with CONFIG_PM=n
You can try play with HWMOD props, like add flags to gpio hwmods:
HWMOD_NO_OCP_AUTOIDLE
HWMOD_NO_IDLE
HWMOD_CLKDM_NOAUTO
--
regards,
-grygorii
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