[Letux-kernel] [PATCH v2 0/3] mach-omap2: handle autoidle denial

Stephen Boyd sboyd at kernel.org
Fri Nov 30 01:26:13 CET 2018


Quoting Andreas Kemnade (2018-11-10 12:31:12)
> On the gta04 with a dm3730 omap_hdq does not work properly when the
> device enters lower power states. Idling uart1 and 2 is enough
> to show up that problem, if there are no other things enabled.
> Further research reveals that hdq iclk must not be turned off during
> transfers, also according to the TRM. That fact is also correctly described
> in the flags but the code to handle that is incomplete.
> 
> To handle multiple users of a single ick, autoidle is disabled
> when a user of that ick requires that (has the OCPIF_SWSUP_IDLE))
> 
> Changes since v1:
> - uses spinlocks instead of mutexes
> - invert counter logic
> - check whether clock type is basic
> 

I'm expecting someone like Tero or Tony to review this.



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