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

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Message-ID: <154353757335.88331.5161306764126530976@swboyd.mtv.corp.google.com>
Date:   Thu, 29 Nov 2018 16:26:13 -0800
From:   Stephen Boyd <sboyd@...nel.org>
To:     Andreas Kemnade <andreas@...nade.info>, bcousson@...libre.com,
        letux-kernel@...nphoenux.org, linux-clk@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-omap@...r.kernel.org,
        mturquette@...libre.com, paul@...an.com, t-kristo@...com,
        tony@...mide.com
Cc:     Andreas Kemnade <andreas@...nade.info>
Subject: Re: [PATCH v2 0/3] mach-omap2: handle autoidle denial

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.