linux-kernel - RE: [RFC 2/2] PCI: imx6: Enable imx6qp pcie power management support

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Date:   Thu, 10 Feb 2022 01:58:19 +0000
From:   Hongxing Zhu <hongxing.zhu@....com>
To:     Lucas Stach <l.stach@...gutronix.de>,
        "bhelgaas@...gle.com" <bhelgaas@...gle.com>,
        "lorenzo.pieralisi@....com" <lorenzo.pieralisi@....com>,
        "shawnguo@...nel.org" <shawnguo@...nel.org>
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: [RFC 2/2] PCI: imx6: Enable imx6qp pcie power management support

> -----Original Message-----
> From: Lucas Stach <l.stach@...gutronix.de>
> Sent: 2022年2月9日 17:08
> To: Hongxing Zhu <hongxing.zhu@....com>; bhelgaas@...gle.com;
> lorenzo.pieralisi@....com; shawnguo@...nel.org
> 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: [RFC 2/2] PCI: imx6: Enable imx6qp pcie power management
> support
> 
> s/pcie/PCIe/ and maybe s/imx6qp/i.MX6QP/ in the subject.
Thanks, would be changed later.

> 
> Am Mittwoch, dem 09.02.2022 um 15:02 +0800 schrieb Richard Zhu:
> > i.MX6QP PCIe supports the RESET logic, thus it can support the L2 exit
> > by the reset mechanism.
> > Enable the i.MX6QP PCIe suspend/resume operations support.
> >
> > Signed-off-by: Richard Zhu <hongxing.zhu@....com>
> 
> Other than the nitpick:
> Reviewed-by: Lucas Stach <l.stach@...gutronix.de>

Thanks.
Best Regards
Richard Zhu> 
> > ---
> >  drivers/pci/controller/dwc/pci-imx6.c | 4 +++-
> >  1 file changed, 3 insertions(+), 1 deletion(-)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 784801f2f9e6..62262483470a 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -995,6 +995,7 @@ static void imx6_pcie_pm_turnoff(struct imx6_pcie
> *imx6_pcie)
> >  	/* Others poke directly at IOMUXC registers */
> >  	switch (imx6_pcie->drvdata->variant) {
> >  	case IMX6SX:
> > +	case IMX6QP:
> >  		regmap_update_bits(imx6_pcie->iomuxc_gpr, IOMUXC_GPR12,
> >  				IMX6SX_GPR12_PCIE_PM_TURN_OFF,
> >  				IMX6SX_GPR12_PCIE_PM_TURN_OFF);
> > @@ -1307,7 +1308,8 @@ static const struct imx6_pcie_drvdata drvdata[] =
> {
> >  	[IMX6QP] = {
> >  		.variant = IMX6QP,
> >  		.flags = IMX6_PCIE_FLAG_IMX6_PHY |
> > -			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE,
> > +			 IMX6_PCIE_FLAG_IMX6_SPEED_CHANGE |
> > +			 IMX6_PCIE_FLAG_SUPPORTS_SUSPEND,
> >  		.dbi_length = 0x200,
> >  	},
> >  	[IMX7D] = {
>