linux-kernel - RE: [PATCH v9 5/8] PCI: imx6: Refine the regulator usage

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Message-ID: <AS8PR04MB8676EFCB2BA9C1DD0F33C4FA8CA79@AS8PR04MB8676.eurprd04.prod.outlook.com>
Date:   Thu, 9 Jun 2022 06:19:47 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Bjorn Helgaas <helgaas@...nel.org>
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 5/8] PCI: imx6: Refine the regulator usage

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@...nel.org>
> Sent: 2022年6月9日 2:55
> 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 5/8] PCI: imx6: Refine the regulator usage
> 
> On Fri, May 06, 2022 at 09:47:06AM +0800, Richard Zhu wrote:
> > The driver should undo any enables it did itself. The regulator
> > disable shouldn't be basing decisions on regulator_is_enabled().
> >
> > To keep the balance of the regulator usage counter, disable the
> > regulator just behind of imx6_pcie_assert_core_reset() in resume and
> shutdown.
> 
> In subject, "Refine" doesn't tell me anything about what's happening here.
Thanks for your comments.
How about the following one?
PCI: imx6: Do regulator disable without the regulator_is_enabled check

Best Regards
Richard Zhu