* RE: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3
@ 2021-05-11 1:43 Richard Zhu
0 siblings, 0 replies; 3+ messages in thread
From: Richard Zhu @ 2021-05-11 1:43 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
lorenzo.pieralisi, linux-pci, dl-linux-imx, linux-arm-kernel,
linux-kernel, kernel
Hi Bjorn:
It seems that the email I replied on May07, is missing.
Re-send it.
Best Regards
Richard Zhu
> -----Original Message-----
<...>
> Subject: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph
> voltage is 3v3
> On Tue, Mar 30, 2021 at 04:08:21PM +0800, Richard Zhu wrote:
> > Both 1.8v and 3.3v power supplies can be used by i.MX8MQ PCIe PHY.
> > In default, the PCIE_VPH voltage is suggested to be 1.8v refer to data
> > sheet. When PCIE_VPH is supplied by 3.3v in the HW schematic design,
> > the VREG_BYPASS bits of GPR registers should be cleared from default
> > value 1b'1 to 1b'0. Thus, the internal 3v3 to 1v8 translator would be
> > turned on.
>
> Maybe something like this?
>
> PCI: imx6: Enable PHY internal regulator when supplied >3V
>
> The i.MX8MQ PCIe PHY needs 1.8V but can by supplied by either a 1.8V
> or a 3.3V regulator.
>
> The "vph-supply" DT property tells us which external regulator
> supplies the PHY. If that regulator supplies anything over 3V,
> enable the PHY's internal 3.3V-to-1.8V regulator.
>
[Richard Zhu] Hi Bjorn:
Thanks for your comments.
vph is the "high-voltage power supply" of the PHY.
How do you think with the following one with some minor updates?
PCI: imx6: Enable PHY internal regulator when supplied >3V
The i.MX8MQ PCIe PHY needs 1.8V in default but can be supplied by
either a 1.8V or a 3.3V regulator.
The "vph-supply" DT property tells us which external regulator
supplies the PHY. If that regulator supplies anything over 3V,
enable the PHY's internal 3.3V-to-1.8V regulator.
BR
Richard
> > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> > Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> > ---
> > drivers/pci/controller/dwc/pci-imx6.c | 20 ++++++++++++++++++++
> > 1 file changed, 20 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 853ea8e82952..94b43b4ecca1 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -37,6 +37,7 @@
> > #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
> > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
> > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
> > +#define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12)
> > #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
> > #define IMX8MQ_PCIE2_BASE_ADDR
> 0x33c00000
> >
> > @@ -80,6 +81,7 @@ struct imx6_pcie {
> > u32 tx_swing_full;
> > u32 tx_swing_low;
> > struct regulator *vpcie;
> > + struct regulator *vph;
> > void __iomem *phy_base;
> >
> > /* power domain for pcie */
> > @@ -621,6 +623,17 @@ static void imx6_pcie_init_phy(struct imx6_pcie
> *imx6_pcie)
> > imx6_pcie_grp_offset(imx6_pcie),
> >
> IMX8MQ_GPR_PCIE_REF_USE_PAD,
> >
> IMX8MQ_GPR_PCIE_REF_USE_PAD);
> > + /*
> > + * Regarding the datasheet, the PCIE_VPH is suggested
> > + * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
> > + * VREG_BYPASS should be cleared to zero.
> > + */
> > + if (imx6_pcie->vph &&
> > + regulator_get_voltage(imx6_pcie->vph) > 3000000)
> > + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> > +
> imx6_pcie_grp_offset(imx6_pcie),
> > +
> IMX8MQ_GPR_PCIE_VREG_BYPASS,
> > + 0);
> > break;
> > case IMX7D:
> > regmap_update_bits(imx6_pcie->iomuxc_gpr,
> IOMUXC_GPR12,
> > @@ -1130,6 +1143,13 @@ static int imx6_pcie_probe(struct
> platform_device *pdev)
> > imx6_pcie->vpcie = NULL;
> > }
> >
> > + imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev,
> "vph");
> > + if (IS_ERR(imx6_pcie->vph)) {
> > + if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
> > + return PTR_ERR(imx6_pcie->vph);
> > + imx6_pcie->vph = NULL;
> > + }
> > +
> > platform_set_drvdata(pdev, imx6_pcie);
> >
> > ret = imx6_pcie_attach_pd(dev);
> > --
> > 2.17.1
> >
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3
2021-05-07 6:18 Richard Zhu
@ 2021-05-10 1:15 ` Richard Zhu
0 siblings, 0 replies; 3+ messages in thread
From: Richard Zhu @ 2021-05-10 1:15 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
lorenzo.pieralisi, linux-pci, dl-linux-imx, linux-arm-kernel,
linux-kernel, kernel
Hi:
It seems that the email sent on May07, is missing.
Re-send it.
Best Regards
Richard Zhu
> -----Original Message-----
> From: Richard Zhu
> Sent: Friday, May 7, 2021 2:18 PM
...
> Subject: RE: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph
> voltage is 3v3
>
>
> > -----Original Message-----
> > Subject: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when
> > pcie vph voltage is 3v3 On Tue, Mar 30, 2021 at 04:08:21PM +0800,
> > Richard Zhu wrote:
> > > Both 1.8v and 3.3v power supplies can be used by i.MX8MQ PCIe PHY.
> > > In default, the PCIE_VPH voltage is suggested to be 1.8v refer to
> > > data sheet. When PCIE_VPH is supplied by 3.3v in the HW schematic
> > > design, the VREG_BYPASS bits of GPR registers should be cleared from
> > > default value 1b'1 to 1b'0. Thus, the internal 3v3 to 1v8 translator
> > > would be turned on.
> >
> > Maybe something like this?
> >
> > PCI: imx6: Enable PHY internal regulator when supplied >3V
> >
> > The i.MX8MQ PCIe PHY needs 1.8V but can by supplied by either a 1.8V
> > or a 3.3V regulator.
> >
> > The "vph-supply" DT property tells us which external regulator
> > supplies the PHY. If that regulator supplies anything over 3V,
> > enable the PHY's internal 3.3V-to-1.8V regulator.
> >
> [Richard Zhu] Hi Bjorn:
> Thanks for your comments.
> vph is the "high-voltage power supply" of the PHY.
> How do you think with the following one with some minor updates?
>
> PCI: imx6: Enable PHY internal regulator when supplied >3V
>
> The i.MX8MQ PCIe PHY needs 1.8V in default but can be supplied by
> either a 1.8V or a 3.3V regulator.
>
> The "vph-supply" DT property tells us which external regulator
> supplies the PHY. If that regulator supplies anything over 3V,
> enable the PHY's internal 3.3V-to-1.8V regulator.
> BR
> Richard
> > > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> > > Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> > > ---
> > > drivers/pci/controller/dwc/pci-imx6.c | 20 ++++++++++++++++++++
> > > 1 file changed, 20 insertions(+)
> > >
> > > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > > b/drivers/pci/controller/dwc/pci-imx6.c
> > > index 853ea8e82952..94b43b4ecca1 100644
> > > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > > @@ -37,6 +37,7 @@
> > > #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
> > > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
> > > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
> > > +#define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12)
> > > #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11,
> 8)
> > > #define IMX8MQ_PCIE2_BASE_ADDR
> > 0x33c00000
> > >
> > > @@ -80,6 +81,7 @@ struct imx6_pcie {
> > > u32 tx_swing_full;
> > > u32 tx_swing_low;
> > > struct regulator *vpcie;
> > > + struct regulator *vph;
> > > void __iomem *phy_base;
> > >
> > > /* power domain for pcie */
> > > @@ -621,6 +623,17 @@ static void imx6_pcie_init_phy(struct imx6_pcie
> > *imx6_pcie)
> > >
> imx6_pcie_grp_offset(imx6_pcie),
> > >
> > IMX8MQ_GPR_PCIE_REF_USE_PAD,
> > >
> > IMX8MQ_GPR_PCIE_REF_USE_PAD);
> > > + /*
> > > + * Regarding the datasheet, the PCIE_VPH is suggested
> > > + * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
> > > + * VREG_BYPASS should be cleared to zero.
> > > + */
> > > + if (imx6_pcie->vph &&
> > > + regulator_get_voltage(imx6_pcie->vph) > 3000000)
> > > + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> > > +
> > imx6_pcie_grp_offset(imx6_pcie),
> > > +
> > IMX8MQ_GPR_PCIE_VREG_BYPASS,
> > > + 0);
> > > break;
> > > case IMX7D:
> > > regmap_update_bits(imx6_pcie->iomuxc_gpr,
> > IOMUXC_GPR12,
> > > @@ -1130,6 +1143,13 @@ static int imx6_pcie_probe(struct
> > platform_device *pdev)
> > > imx6_pcie->vpcie = NULL;
> > > }
> > >
> > > + imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev,
> > "vph");
> > > + if (IS_ERR(imx6_pcie->vph)) {
> > > + if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
> > > + return PTR_ERR(imx6_pcie->vph);
> > > + imx6_pcie->vph = NULL;
> > > + }
> > > +
> > > platform_set_drvdata(pdev, imx6_pcie);
> > >
> > > ret = imx6_pcie_attach_pd(dev);
> > > --
> > > 2.17.1
> > >
^ permalink raw reply [flat|nested] 3+ messages in thread
* RE: Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3
@ 2021-05-07 6:18 Richard Zhu
2021-05-10 1:15 ` Richard Zhu
0 siblings, 1 reply; 3+ messages in thread
From: Richard Zhu @ 2021-05-07 6:18 UTC (permalink / raw)
To: Bjorn Helgaas
Cc: l.stach, andrew.smirnov, shawnguo, kw, bhelgaas, stefan,
lorenzo.pieralisi, linux-pci, dl-linux-imx, linux-arm-kernel,
linux-kernel, kernel
> -----Original Message-----
> Subject: [EXT] Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph
> voltage is 3v3
> On Tue, Mar 30, 2021 at 04:08:21PM +0800, Richard Zhu wrote:
> > Both 1.8v and 3.3v power supplies can be used by i.MX8MQ PCIe PHY.
> > In default, the PCIE_VPH voltage is suggested to be 1.8v refer to data
> > sheet. When PCIE_VPH is supplied by 3.3v in the HW schematic design,
> > the VREG_BYPASS bits of GPR registers should be cleared from default
> > value 1b'1 to 1b'0. Thus, the internal 3v3 to 1v8 translator would be
> > turned on.
>
> Maybe something like this?
>
> PCI: imx6: Enable PHY internal regulator when supplied >3V
>
> The i.MX8MQ PCIe PHY needs 1.8V but can by supplied by either a 1.8V
> or a 3.3V regulator.
>
> The "vph-supply" DT property tells us which external regulator
> supplies the PHY. If that regulator supplies anything over 3V,
> enable the PHY's internal 3.3V-to-1.8V regulator.
>
[Richard Zhu] Hi Bjorn:
Thanks for your comments.
vph is the "high-voltage power supply" of the PHY.
How do you think with the following one with some minor updates?
PCI: imx6: Enable PHY internal regulator when supplied >3V
The i.MX8MQ PCIe PHY needs 1.8V in default but can be supplied by
either a 1.8V or a 3.3V regulator.
The "vph-supply" DT property tells us which external regulator
supplies the PHY. If that regulator supplies anything over 3V,
enable the PHY's internal 3.3V-to-1.8V regulator.
BR
Richard
> > Signed-off-by: Richard Zhu <hongxing.zhu@nxp.com>
> > Reviewed-by: Lucas Stach <l.stach@pengutronix.de>
> > ---
> > drivers/pci/controller/dwc/pci-imx6.c | 20 ++++++++++++++++++++
> > 1 file changed, 20 insertions(+)
> >
> > diff --git a/drivers/pci/controller/dwc/pci-imx6.c
> > b/drivers/pci/controller/dwc/pci-imx6.c
> > index 853ea8e82952..94b43b4ecca1 100644
> > --- a/drivers/pci/controller/dwc/pci-imx6.c
> > +++ b/drivers/pci/controller/dwc/pci-imx6.c
> > @@ -37,6 +37,7 @@
> > #define IMX8MQ_GPR_PCIE_REF_USE_PAD BIT(9)
> > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE_EN BIT(10)
> > #define IMX8MQ_GPR_PCIE_CLK_REQ_OVERRIDE BIT(11)
> > +#define IMX8MQ_GPR_PCIE_VREG_BYPASS BIT(12)
> > #define IMX8MQ_GPR12_PCIE2_CTRL_DEVICE_TYPE GENMASK(11, 8)
> > #define IMX8MQ_PCIE2_BASE_ADDR
> 0x33c00000
> >
> > @@ -80,6 +81,7 @@ struct imx6_pcie {
> > u32 tx_swing_full;
> > u32 tx_swing_low;
> > struct regulator *vpcie;
> > + struct regulator *vph;
> > void __iomem *phy_base;
> >
> > /* power domain for pcie */
> > @@ -621,6 +623,17 @@ static void imx6_pcie_init_phy(struct imx6_pcie
> *imx6_pcie)
> > imx6_pcie_grp_offset(imx6_pcie),
> >
> IMX8MQ_GPR_PCIE_REF_USE_PAD,
> >
> IMX8MQ_GPR_PCIE_REF_USE_PAD);
> > + /*
> > + * Regarding the datasheet, the PCIE_VPH is suggested
> > + * to be 1.8V. If the PCIE_VPH is supplied by 3.3V, the
> > + * VREG_BYPASS should be cleared to zero.
> > + */
> > + if (imx6_pcie->vph &&
> > + regulator_get_voltage(imx6_pcie->vph) > 3000000)
> > + regmap_update_bits(imx6_pcie->iomuxc_gpr,
> > +
> imx6_pcie_grp_offset(imx6_pcie),
> > +
> IMX8MQ_GPR_PCIE_VREG_BYPASS,
> > + 0);
> > break;
> > case IMX7D:
> > regmap_update_bits(imx6_pcie->iomuxc_gpr,
> IOMUXC_GPR12,
> > @@ -1130,6 +1143,13 @@ static int imx6_pcie_probe(struct
> platform_device *pdev)
> > imx6_pcie->vpcie = NULL;
> > }
> >
> > + imx6_pcie->vph = devm_regulator_get_optional(&pdev->dev,
> "vph");
> > + if (IS_ERR(imx6_pcie->vph)) {
> > + if (PTR_ERR(imx6_pcie->vph) != -ENODEV)
> > + return PTR_ERR(imx6_pcie->vph);
> > + imx6_pcie->vph = NULL;
> > + }
> > +
> > platform_set_drvdata(pdev, imx6_pcie);
> >
> > ret = imx6_pcie_attach_pd(dev);
> > --
> > 2.17.1
> >
^ permalink raw reply [flat|nested] 3+ messages in thread
end of thread, other threads:[~2021-05-11 1:43 UTC | newest]
Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
-- links below jump to the message on this page --
2021-05-11 1:43 Re: [RESEND v4 2/2] PCI: imx: clear vreg bypass when pcie vph voltage is 3v3 Richard Zhu
-- strict thread matches above, loose matches on Subject: below --
2021-05-07 6:18 Richard Zhu
2021-05-10 1:15 ` Richard Zhu
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).