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

Tero Kristo
2018-11-30T07:37:58Z

On 30/11/2018 02:26, Stephen Boyd wrote:
> 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.
>

Rest of it looks fine to me, except for the discussion under the
CLK_IS_BASIC flag, which might trigger a bigger rework of the code.

-Tero
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