linux-kernel - Re: [RESEND v2 4/5] PCI: imx6: Fix the clock reference handling unbalance when link never came up

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Date:   Tue, 26 Oct 2021 17:21:47 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     Krzysztof Wilczyński <kw@...ux.com>,
        "l.stach@...gutronix.de" <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "linux-pci@...r.kernel.org" <linux-pci@...r.kernel.org>,
        dl-linux-imx <linux-imx@....com>,
        "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>
Subject: Re: [RESEND v2 4/5] PCI: imx6: Fix the clock reference handling
 unbalance when link never came up

On Mon, Oct 25, 2021 at 02:35:36AM +0000, Richard Zhu wrote:
> > -----Original Message-----
> > From: Krzysztof Wilczyński <kw@...ux.com>
> > Sent: Saturday, October 23, 2021 5:54 PM
> > To: Richard Zhu <hongxing.zhu@....com>
> > Cc: Bjorn Helgaas <helgaas@...nel.org>; l.stach@...gutronix.de;
> > bhelgaas@...gle.com; lorenzo.pieralisi@....com; linux-pci@...r.kernel.org;
> > dl-linux-imx <linux-imx@....com>; linux-arm-kernel@...ts.infradead.org;
> > linux-kernel@...r.kernel.org; kernel@...gutronix.de
> > Subject: Re: [RESEND v2 4/5] PCI: imx6: Fix the clock reference handling
> > unbalance when link never came up

> > I hope you don't mind me asking, but how is an empty default case in the
> > switch statement helping IMX6Q and IMX6QP?  What does it achieve for
> > these two controllers specifically?
> > 
> [Richard Zhu] Never mind. 😊.
> There might be following building warning if the "default:break" is removed.
> "  CC      drivers/pci/controller/dwc/pci-imx6.o
> drivers/pci/controller/dwc/pci-imx6.c: In function ‘imx6_pcie_clk_disable’:
> drivers/pci/controller/dwc/pci-imx6.c:527:2: warning: enumeration value ‘IMX6Q’ not handled in switch [-Wswitch]
>   527 |  switch (imx6_pcie->drvdata->variant) {
>       |  ^~~~~~
> drivers/pci/controller/dwc/pci-imx6.c:527:2: warning: enumeration value ‘IMX6QP’ not handled in switch [-Wswitch]"

Sorry, I didn't see this until after asking the same question as
Krzysztof.

Sigh.  That's a really annoying gcc warning, but I guess I won't fight
it ;)

Bjorn