linux-kernel - Re: [PATCH v3 1/2] soc: imx: gpc: Disable 6sl display power gating for ERR006287

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Message-ID: <1531312186.3163.52.camel@pengutronix.de>
Date:   Wed, 11 Jul 2018 14:29:46 +0200
From:   Lucas Stach <l.stach@...gutronix.de>
To:     Leonard Crestez <leonard.crestez@....com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Shawn Guo <shawnguo@...nel.org>
Cc:     Fabio Estevam <fabio.estevam@....com>, linux-pm@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        linux-imx@....com, kernel@...gutronix.de
Subject: Re: [PATCH v3 1/2] soc: imx: gpc: Disable 6sl display power gating
 for ERR006287

Am Mittwoch, den 11.07.2018, 15:21 +0300 schrieb Leonard Crestez:
> On Wed, 2018-07-11 at 14:16 +0200, Lucas Stach wrote:
> > Am Mittwoch, den 11.07.2018, 15:11 +0300 schrieb Leonard Crestez:
> > > Handle this in the safest possible way by keeping the DISP domain
> > > always-on.
> > > 
> > > Signed-off-by: Leonard Crestez <leonard.crestez@....com>
> > 
> > Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> > 
> > Can you send a follow on patch to switch the i.MX6QP errata
> > workaround
> > to use GENPD_FLAG_ALWAYS_ON and remove the -EBUSY stuff in the
> > power
> > down path?
> 
> Sure.
> 
> I was thinking of converting it to a new GENPD_FLAG which allows
> power_off in suspend (as suggested by Ulf) but switching to
> GENPD_FLAG_ALWAYS_ON in order to simplify the code could be done
> first.

Sure, if you are going to work on this I'm fine with converting it over
to this without first going for GENPD_FLAG_ALWAYS_ON. Just wanted to
make sure that things are consistent.

> The -EBUSY stuff is not very harmful.

It's dead code once the appropriate flags have been added to the
domain, so should be removed.

Regards,
Lucas