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Date: Thu, 9 Jun 2022 06:18:11 +0000
From: Hongxing Zhu <hongxing.zhu@....com>
To: Lucas Stach <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>
CC: "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 7/8] PCI: imx6: Move the phy driver callbacks to the
proper places
> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年6月8日 15:45
> To: Hongxing Zhu <hongxing.zhu@....com>; bhelgaas@...gle.com;
> robh+dt@...nel.org; broonie@...nel.org; lorenzo.pieralisi@....com;
> jingoohan1@...il.com; festevam@...il.com;
> francesco.dolcini@...adex.com
> Cc: 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 7/8] PCI: imx6: Move the phy driver callbacks to the
> proper places
>
> Am Freitag, dem 06.05.2022 um 09:47 +0800 schrieb Richard Zhu:
> > To make it more reasonable, move the phy_power_on/phy_init callbacks
> > to the proper places.
> > - move the phy_power_on() out of imx6_pcie_clk_enable().
> > - move the phy_init() out of imx6_pcie_deassert_core_reset().
> >
> > In order to save power consumption, turn off the clocks and regulators
> > when the imx6_pcie_host_init() return error.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> > ---
> > drivers/pci/controller/dwc/pci-imx6.c | 77
> > +++++++++++++++++++++------
> > 1 file changed, 61 insertions(+), 16 deletions(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index d122c12193a6..f0ffd9011975 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -497,14 +497,6 @@ static int imx6_pcie_clk_enable(struct imx6_pcie
> *imx6_pcie)
> > goto err_ref_clk;
> > }
> >
> > - switch (imx6_pcie->drvdata->variant) {
> > - case IMX8MM:
> > - if (phy_power_on(imx6_pcie->phy))
> > - dev_err(dev, "unable to power on PHY\n");
> > - break;
> > - default:
> > - break;
> > - }
> > /* allow the clocks to stabilize */
> > usleep_range(200, 500);
> > return 0;
> > @@ -597,10 +589,7 @@ static int imx6_pcie_deassert_core_reset(struct
> imx6_pcie *imx6_pcie)
> > switch (imx6_pcie->drvdata->variant) {
> > case IMX8MQ:
> > reset_control_deassert(imx6_pcie->pciephy_reset);
> > - break;
> > case IMX8MM:
> > - if (phy_init(imx6_pcie->phy))
> > - dev_err(dev, "waiting for phy ready timeout!\n");
>
> This looks fishy. You now fall-through from the 8MQ case to the 8MM case,
> just to break there. Please move the 8MM case down to the 6QP case that also
> doesn't need to do anything here.
>
Thanks for your comments.
Would be changed.
> > break;
> > case IMX7D:
> > reset_control_deassert(imx6_pcie->pciephy_reset);
> > @@ -918,15 +907,38 @@ static int imx6_pcie_host_init(struct pcie_port
> > *pp)
> >
> > imx6_pcie_assert_core_reset(imx6_pcie);
> > imx6_pcie_init_phy(imx6_pcie);
> > + if (imx6_pcie->phy != NULL) {
>
> Same comment as on the last patch: drop the "!= NULL".
Okay, got that, all of them would be changed.
Thanks.
>
> > + ret = phy_power_on(imx6_pcie->phy);
> > + if (ret) {
> > + dev_err(dev, "pcie phy power up failed.\n");
> > + return ret;
> > + }
> > + }
> > +
> > ret = imx6_pcie_deassert_core_reset(imx6_pcie);
> > if (ret < 0) {
> > dev_err(dev, "pcie host init failed: %d.\n", ret);
> > - return ret;
> > + goto err_exit0;
>
> This label is not very descriptive. Please rename to something like err_phy_off
> or something like that.
Okay. Thanks.
>
> > + } else if (imx6_pcie->phy != NULL) {
>
> The else path isn't needed here. If there was an error you already moved the
> contol flow to the error label. So drop the else and again have this block under
> a simple "if (imx6_pcie->phy)" statement.
Okay. Thanks.
>
> > + ret = phy_init(imx6_pcie->phy);
> > + if (ret) {
> > + dev_err(dev, "waiting for phy ready timeout!\n");
> > + goto err_exit1;
>
> Again, please give those labels a more descriptive name.
>
> All of the above comments also apply to the changes in
> imx6_pcie_resume_noirq.
Okay, thanks. Would be changed later.
Best Regards
Richard Zhu
>
> Regards,
> Lucas
>
> > + }
> > }
> >
> > imx6_setup_phy_mpll(imx6_pcie);
> >
> > return 0;
> > +
> > +err_exit1:
> > + imx6_pcie_clk_disable(imx6_pcie);
> > + if (imx6_pcie->vpcie)
> > + regulator_disable(imx6_pcie->vpcie);
> > +err_exit0:
> > + if (imx6_pcie->phy != NULL)
> > + phy_power_off(imx6_pcie->phy);
> > + return ret;
> > }
> >
> > static const struct dw_pcie_host_ops imx6_pcie_host_ops = { @@
> > -1031,14 +1043,47 @@ static int imx6_pcie_resume_noirq(struct device
> *dev)
> > regulator_disable(imx6_pcie->vpcie);
> >
> > imx6_pcie_init_phy(imx6_pcie);
> > - imx6_pcie_deassert_core_reset(imx6_pcie);
> > - dw_pcie_setup_rc(pp);
> > + if (imx6_pcie->phy != NULL) {
> > + ret = phy_power_on(imx6_pcie->phy);
> > + if (ret) {
> > + dev_err(dev, "pcie phy power up failed.\n");
> > + return ret;
> > + }
> > + }
> > +
> > + ret = imx6_pcie_deassert_core_reset(imx6_pcie);
> > + if (ret < 0) {
> > + dev_err(dev, "pcie deassert core reset failed: %d.\n", ret);
> > + goto err_exit0;
> > + } else if (imx6_pcie->phy != NULL) {
> > + ret = phy_init(imx6_pcie->phy);
> > + if (ret) {
> > + dev_err(dev, "pcie phy init failed.\n");
> > + goto err_exit1;
> > + }
> > + }
> >
> > + dw_pcie_setup_rc(pp);
> > ret = imx6_pcie_start_link(imx6_pcie->pci);
> > - if (ret < 0)
> > - dev_info(dev, "pcie link is down after resume.\n");
> > + if (ret < 0) {
> > + /*
> > + * Return ret directly, since there are error exit
> > + * handle in imx6_pcie_start_link()
> > + */
> > + dev_err(dev, "pcie link is down after resume.\n");
> > + return ret;
> > + }
> >
> > return 0;
> > +
> > +err_exit1:
> > + imx6_pcie_clk_disable(imx6_pcie);
> > + if (imx6_pcie->vpcie)
> > + regulator_disable(imx6_pcie->vpcie);
> > +err_exit0:
> > + if (imx6_pcie->phy != NULL)
> > + phy_power_off(imx6_pcie->phy);
> > + return ret;
> > }
> > #endif
> >
>
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