linux-kernel - Re: [Patch 3/6] ARM: OMAP: DRA7xx: Make CAM clock domain SWSUP only

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Date:   Fri, 13 Oct 2017 12:59:43 -0500
From:   Benoit Parrot <bparrot@...com>
To:     Tony Lindgren <tony@...mide.com>
CC:     Tero Kristo <t-kristo@...com>, Rob Herring <robh+dt@...nel.org>,
        <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <linux-omap@...r.kernel.org>, <linux-media@...r.kernel.org>
Subject: Re: [Patch 3/6] ARM: OMAP: DRA7xx: Make CAM clock domain SWSUP only

Tony Lindgren <tony@...mide.com> wrote on Fri [2017-Oct-13 10:01:13 -0700]:
> * Benoit Parrot <bparrot@...com> [171012 12:29]:
> > HWSUP on this domain is only working when VIP1 probes.
> > If only VIP2 on DRA74x or CAL on DRA72x probes the domain does
> > not get enabled. This might indicates an issue in the HW Auto
> > state-machine for this domain.
> >
> > Work around is to set the CAM domain to use SWSUP only.
> 
> Hmm this you might get fixed automatically by configuring the
> parent interconnect target module to use "ti,sysc-omap4" and
> adding VIP1 and VIP2 as children to it.
> 
> The reason why I suspect it will fix the issue is because
> with the parent being "ti,sysc-omap4" with "ti,hwmods" being
> in that parent node too, you automatically get PM runtime
> refcounting keep the parent active for either child.
> 
> Maybe give it a try against today's Linux next and see for
> example how it was done for musb:
> 
> https://patchwork.kernel.org/patch/9978783/
> 
> Just use "ti,sysc-omap2" for type1 and "ti,sysc-omap4"
> for type2.

Hmm interesting, I'll give that a try and if it fixes it.

Benoit

> 
> Regards,
> 
> Tony