linux-kernel - Re: [PATCH v6 0/2] memory: Introduce ti-emif-sram driver

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Message-ID: <20171203163632.GU28152@atomide.com>
Date:   Sun, 3 Dec 2017 08:36:32 -0800
From:   Tony Lindgren <tony@...mide.com>
To:     "santosh.shilimkar@...cle.com" <santosh.shilimkar@...cle.com>
Cc:     Dave Gerlach <d-gerlach@...com>,
        Santosh Shilimkar <ssantosh@...nel.org>,
        linux-arm-kernel@...ts.infradead.org, linux-omap@...r.kernel.org,
        linux-kernel@...r.kernel.org, devicetree@...r.kernel.org,
        Rob Herring <robh+dt@...nel.org>,
        Russell King <linux@...linux.org.uk>,
        Keerthy J <j-keerthy@...com>, Johan Hovold <johan@...nel.org>
Subject: Re: [PATCH v6 0/2] memory: Introduce ti-emif-sram driver

* santosh.shilimkar@...cle.com <santosh.shilimkar@...cle.com> [171203 04:03]:
> 
> 
> On 11/30/17 2:56 PM, Dave Gerlach wrote:
> > This is a resend of v5 of this series found here [1]. It introduces
> > relocatable PM handlers for the emif that are copied to sram and
> > run from there during low power mode entry.
> > 
> > The patches still have the previous ACKs but have a small change to
> > accomodate a change made by Tony in commit cd57dc5a2099 ("ARM: dts:
> > Add missing hwmod related nodes for am33xx"). If there are objections
> > to this let me know ASAP.
> > 
> > Now that a hwmod is present for the am335x EMIF, on probe fail the call to
> > pm_runtime_put_sync causes the board to hang. In fact, this emif driver should
> > never alter the PM state of the hardware at all through normal kernel calls, it
> > is the job of the suspend handlers that are added, that is the whole point of
> > this driver. Because of this, I have dropped all runtime pm calls, as any
> > change to the PM state while the kernel is running is dangerous as we may shut
> > of the memory controller. It makes the most sense just to drop runtime PM from
> > the driver entirely. Besides that patch is unchanged.
> > 
> > This code is required for low-power modes to work on AM335x and AM437x and a
> > forthcoming PM series for those platforms will depend on this series. After
> > both this and the PM series are reviewed I will send the necessary device tree
> > changes for both, but in the meantime all remaining patches for am335x and
> > am437x PM can be found here [2].
> > 
> Applied

OK, do you have some immutable commit for these I can pull in too for
the related SoC changes?

Regards,

Tony