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, 19 Oct 2021 07:56:55 +0000
From:   Richard 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>,
        "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

> -----Original Message-----
> From: Bjorn Helgaas <helgaas@...nel.org>
> Sent: Saturday, October 16, 2021 2:52 AM
> To: Richard Zhu <hongxing.zhu@....com>
> Cc: 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
> 
> On Fri, Oct 15, 2021 at 01:49:45PM -0500, Bjorn Helgaas wrote:
> > On Fri, Oct 15, 2021 at 02:05:40PM +0800, Richard Zhu wrote:
> > > When link never came up, driver probe would be failed with error -110.
> > > To keep usage counter balance of the clocks, disable the previous
> > > enabled clocks when link is down.
> > > Move definitions of the imx6_pcie_clk_disable() function to the
> > > proper place. Because it wouldn't be used in imx6_pcie_suspend_noirq()
> only.
> 
> > > -static void imx6_pcie_clk_disable(struct imx6_pcie *imx6_pcie) -{
> > > -	clk_disable_unprepare(imx6_pcie->pcie);
> > > -	clk_disable_unprepare(imx6_pcie->pcie_phy);
> > > -	clk_disable_unprepare(imx6_pcie->pcie_bus);
> > > -
> > > -	switch (imx6_pcie->drvdata->variant) {
> > > -	case IMX6SX:
> > > -		clk_disable_unprepare(imx6_pcie->pcie_inbound_axi);
> > > -		break;
> > > -	case IMX7D:
> > > -		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> > > -				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL,
> > > -				   IMX7D_GPR12_PCIE_PHY_REFCLK_SEL);
> > > -		break;
> > > -	case IMX8MQ:
> > > -		clk_disable_unprepare(imx6_pcie->pcie_aux);
> > > -		break;
> > > -	default:
> > > -		break;
> 
> While you're at it, this "default: break;" thing is pointless.
> Normally it's better to just *move* something without changing it at all, but
> this is such a simple thing I think you could drop this at the same time as the
> move.
> 
[Richard Zhu] Okay, got that. Would remove the "default:break" later. Thanks.

Best Regards
Richard Zhu

> > > -	}
> > > -}