linux-kernel - Re: [PATCH v9 7/8] PCI: imx6: Move the phy driver callbacks to the proper places

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Date:   Thu, 9 Jun 2022 11:25:52 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Hongxing Zhu <hongxing.zhu@....com>
Cc:     "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "robh+dt@...nel.org" <robh+dt@...nel.org>,
        "broonie@...nel.org" <broonie@...nel.org>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "jingoohan1@...il.com" <jingoohan1@...il.com>,
        "festevam@...il.com" <festevam@...il.com>,
        "francesco.dolcini@...adex.com" <francesco.dolcini@...adex.com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        "linux-arm-kernel@...ts.infradead.org" 
        <linux-arm-kernel@...ts.infradead.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "kernel@...gutronix.de" <kernel@...gutronix.de>,
        dl-linux-imx <linux-imx@....com>
Subject: Re: [PATCH v9 7/8] PCI: imx6: Move the phy driver callbacks to the
 proper places

On Thu, Jun 09, 2022 at 06:20:16AM +0000, Hongxing Zhu wrote:
> > -----Original Message-----
> > From: Bjorn Helgaas <helgaas@...nel.org>
> > Sent: 2022年6月9日 2:58
> > To: Hongxing Zhu <hongxing.zhu@....com>
> > Cc: l.stach@...gutronix.de; bhelgaas@...gle.com; robh+dt@...nel.org;
> > broonie@...nel.org; lorenzo.pieralisi@....com; jingoohan1@...il.com;
> > festevam@...il.com; francesco.dolcini@...adex.com;
> > linux-pci@...r.kernel.org; linux-arm-kernel@...ts.infradead.org;
> > linux-kernel@...r.kernel.org; kernel@...gutronix.de; dl-linux-imx
> > <linux-imx@....com>
> > Subject: Re: [PATCH v9 7/8] PCI: imx6: Move the phy driver callbacks to the
> > proper places
> > 
> > On Fri, May 06, 2022 at 09:47:08AM +0800, Richard Zhu wrote:
> > > To make it more reasonable, move the phy_power_on/phy_init callbacks
> > > to the proper places.
> > > - move the phy_power_on() out of imx6_pcie_clk_enable().
> > > - move the phy_init() out of imx6_pcie_deassert_core_reset().
> > 
> > I'm not sure what "make it more reasonable" is telling me.  In
> > subject line and commit log, please say something more specific
> > than "the proper places."
> > 
> > It's probably more important to say where they are moving *to*
> > than where they're moving *out of*.

> Thanks for your comments.
> In another review loop listed below, Lucas used said that it's not
> good to hide PHY init in imx6_pcie_assert_core_reset() So, I make a
> try to move the phy_init() out of imx6_pcie_assert_core_reset().
> And move phy_power_on() out of imx6_pcie_clk_enable() accordingly.
> https://patchwork.kernel.org/project/linux-pci/patch/1646289275-17813-1-git-send-email-hongxing.zhu@nxp.com/
> Okay, I would specific that they are moving *to* later.
> 
> > > In order to save power consumption, turn off the clocks and
> > > regulators when the imx6_pcie_host_init() return error.
> > 
> > Is the power savings the *reason* for this change?  I can't tell
> > from the commit log.
>
> The error handling of the imx6_pcie_host_init() is not mentioned in
> the subject.  Should I split these changes into two patches?

If they can be split, they probably should be split.