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

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Message-ID: <20171013170113.GL4394@atomide.com>
Date:   Fri, 13 Oct 2017 10:01:13 -0700
From:   Tony Lindgren <tony@...mide.com>
To:     Benoit Parrot <bparrot@...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

* 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.

Regards,

Tony