linux-kernel - RE: [RESEND v2 2/5] PCI: imx6: Add the error propagation from host

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Date:   Tue, 19 Oct 2021 07:33:27 +0000
From:   Richard Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>
CC:     "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 2/5] PCI: imx6: Add the error propagation from
 host_init

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: Saturday, October 16, 2021 2:16 AM
> To: Richard Zhu <hongxing.zhu@....com>; bhelgaas@...gle.com;
> lorenzo.pieralisi@....com
> Cc: 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 2/5] PCI: imx6: Add the error propagation from
> host_init
> 
> Am Freitag, dem 15.10.2021 um 14:05 +0800 schrieb Richard Zhu:
> > Since there is error return check of the host_init callback, add error
> > check to imx6_pcie_deassert_core_reset() function, and change the
> > function type accordingly.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> 
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>
> 
[Richard Zhu] Thanks.

Best Regards
Richard Zhu
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 24 ++++++++++++++++--------
> >  1 file changed, 16 insertions(+), 8 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 1fa1dba6da81..3372775834a2 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -527,24 +527,24 @@ static void
> imx7d_pcie_wait_for_phy_pll_lock(struct imx6_pcie *imx6_pcie)
> >  		dev_err(dev, "PCIe PLL lock timeout\n");  }
> >
> > -static void imx6_pcie_deassert_core_reset(struct imx6_pcie
> > *imx6_pcie)
> > +static int imx6_pcie_deassert_core_reset(struct imx6_pcie *imx6_pcie)
> >  {
> >  	struct dw_pcie *pci = imx6_pcie->pci;
> >  	struct device *dev = pci->dev;
> > -	int ret;
> > +	int ret, err;
> >
> >  	if (imx6_pcie->vpcie && !regulator_is_enabled(imx6_pcie->vpcie)) {
> >  		ret = regulator_enable(imx6_pcie->vpcie);
> >  		if (ret) {
> >  			dev_err(dev, "failed to enable vpcie regulator: %d\n",
> >  				ret);
> > -			return;
> > +			return ret;
> >  		}
> >  	}
> >
> > -	ret = imx6_pcie_clk_enable(imx6_pcie);
> > -	if (ret) {
> > -		dev_err(dev, "unable to enable pcie clocks\n");
> > +	err = imx6_pcie_clk_enable(imx6_pcie);
> > +	if (err) {
> > +		dev_err(dev, "unable to enable pcie clocks: %d\n", err);
> >  		goto err_clks;
> >  	}
> >
> > @@ -599,7 +599,7 @@ static void imx6_pcie_deassert_core_reset(struct
> imx6_pcie *imx6_pcie)
> >  		break;
> >  	}
> >
> > -	return;
> > +	return 0;
> >
> >  err_clks:
> >  	if (imx6_pcie->vpcie && regulator_is_enabled(imx6_pcie->vpcie) > 0)
> > { @@ -608,6 +608,7 @@ static void imx6_pcie_deassert_core_reset(struct
> imx6_pcie *imx6_pcie)
> >  			dev_err(dev, "failed to disable vpcie regulator: %d\n",
> >  				ret);
> >  	}
> > +	return err;
> >  }
> >
> >  static void imx6_pcie_configure_type(struct imx6_pcie *imx6_pcie) @@
> > -858,11 +859,18 @@ static int imx6_pcie_start_link(struct dw_pcie
> > *pci)  static int imx6_pcie_host_init(struct pcie_port *pp)  {
> >  	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> > +	struct device *dev = pci->dev;
> >  	struct imx6_pcie *imx6_pcie = to_imx6_pcie(pci);
> > +	int ret;
> >
> >  	imx6_pcie_assert_core_reset(imx6_pcie);
> >  	imx6_pcie_init_phy(imx6_pcie);
> > -	imx6_pcie_deassert_core_reset(imx6_pcie);
> > +	ret = imx6_pcie_deassert_core_reset(imx6_pcie);
> > +	if (ret < 0) {
> > +		dev_err(dev, "pcie host init failed: %d.\n", ret);
> > +		return ret;
> > +	}
> > +
> >  	imx6_setup_phy_mpll(imx6_pcie);
> >
> >  	return 0;
>