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:   Fri, 15 Oct 2021 13:51:41 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Richard Zhu <hongxing.zhu@....com>
Cc:     l.stach@...gutronix.de, bhelgaas@...gle.com,
        lorenzo.pieralisi@....com, linux-pci@...r.kernel.org,
        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.

> > -	}
> > -}