linux-kernel - Re: [PATCH] Revert "firmware: arm_scmi: Add clock management to the SCMI power domain"

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Date:   Thu, 22 Sep 2022 12:04:06 +0100
From:   Sudeep Holla <sudeep.holla@....com>
To:     Ulf Hansson <ulf.hansson@...aro.org>
Cc:     Dien Pham <dien.pham.ry@...esas.com>,
        Gaku Inami <gaku.inami.xh@...esas.com>,
        Cristian Marussi <cristian.marussi@....com>,
        linux-arm-kernel@...ts.infradead.org, Peng Fan <peng.fan@....com>,
        Geert Uytterhoeven <geert@...ux-m68k.org>,
        Nicolas Pitre <npitre@...libre.com>,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH] Revert "firmware: arm_scmi: Add clock management to the
 SCMI power domain"

On Wed, Sep 21, 2022 at 08:46:21PM +0200, Ulf Hansson wrote:
> On Wed, 21 Sept 2022 at 17:56, Sudeep Holla <sudeep.holla@....com> wrote:
> >
> > Hi Dien, Gaku,
> >
> > On Mon, Sep 19, 2022 at 02:20:33PM +0200, Ulf Hansson wrote:
> > > This reverts commit a3b884cef873 ("firmware: arm_scmi: Add clock management
> > > to the SCMI power domain").
> > >
> > > Using the GENPD_FLAG_PM_CLK tells genpd to gate/ungate the consumer
> > > device's clock(s) during runtime suspend/resume through the PM clock API.
> > > More precisely, in genpd_runtime_resume() the clock(s) for the consumer
> > > device would become ungated prior to the driver-level ->runtime_resume()
> > > callbacks gets invoked.
> > >
> > > This behaviour isn't a good fit for all platforms/drivers. For example, a
> > > driver may need to make some preparations of its device in its
> > > ->runtime_resume() callback, like calling clk_set_rate() before the
> > > clock(s) should be ungated. In these cases, it's easier to let the clock(s)
> > > to be managed solely by the driver, rather than at the PM domain level.
> > >
> > > For these reasons, let's drop the use GENPD_FLAG_PM_CLK for the SCMI PM
> > > domain, as to enable it to be more easily adopted across ARM platforms.
> > >
> > > Fixes: a3b884cef873 ("firmware: arm_scmi: Add clock management to the SCMI power domain")
> > > Cc: Nicolas Pitre <npitre@...libre.com>
> > > Cc: stable@...r.kernel.org
> > > Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
> > > ---
> > >
> > > To get some more background to $subject patch, please have a look at the
> > > lore-link below.
> > >
> > > https://lore.kernel.org/all/DU0PR04MB94173B45A2CFEE3BF1BD313A88409@DU0PR04MB9417.eurprd04.prod.outlook.com/
> > >
> >
> > If you have any objections, this is your last chance to speak up before
> > the original change gets reverted in the mainline with this patch.
> >
> > Hi Ulf,
> >
> > I don't have any other SCMI changes for v6.0 fixes or v6.1
> > I am fine if you are happy to take this via your tree or I can send it
> > to SoC team. Let me know. I will give final one or 2 days for Renesas
> > to get back if they really care much.
> 
> I have a slew of fixes for mmc that I intend to send next week, I can
> funnel them through that pull request.
> 
> Assuming, Renesas folkz are okay, I consider that as an ack from you, right?
>

Yes for official reasons, here is the formal :)

Acked-by: Sudeep Holla <sudeep.holla@....com>

in case you manage to get this in via your tree.

--
Regards,
Sudeep