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References: <20220701162726.31346-4-jim2101024@gmail.com> <20220706231323.GA237418@bhelgaas>
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From:   Jim Quinlan <james.quinlan@broadcom.com>
Date:   Fri, 8 Jul 2022 11:16:08 -0400
Message-ID: <CA+-6iNxg1sMrejizShy7iDhdhun7b_4Yo1OA43=FufkZ_W6iyA@mail.gmail.com>
Subject: Re: [PATCH v1 3/4] PCI: brcmstb: Add control of subdevice voltage regulators
To:     Bjorn Helgaas <helgaas@kernel.org>
Cc:     Jim Quinlan <jim2101024@gmail.com>,
        "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" 
        <linux-pci@vger.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@kernel.org>,
        Bjorn Helgaas <bhelgaas@google.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>,
        Cyril Brulebois <kibi@debian.org>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@broadcom.com>,
        Florian Fainelli <f.fainelli@gmail.com>,
        Lorenzo Pieralisi <lpieralisi@kernel.org>,
        Rob Herring <robh@kernel.org>,
        =?UTF-8?Q?Krzysztof_Wilczy=C5=84ski?= <kw@linux.com>,
        Philipp Zabel <p.zabel@pengutronix.de>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@lists.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@lists.infradead.org>,
        open list <linux-kernel@vger.kernel.org>
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On Wed, Jul 6, 2022 at 7:13 PM Bjorn Helgaas <helgaas@kernel.org> wrote:
>
> On Fri, Jul 01, 2022 at 12:27:24PM -0400, Jim Quinlan wrote:
> > This Broadcom STB PCIe RC driver has one port and connects directly to one
> > device, be it a switch or an endpoint.  We want to be able to leverage the
> > recently added mechanism that allocates and turns on/off subdevice
> > regulators.
> >
> > All that needs to be done is to put the regulator DT nodes in the bridge
> > below host and to set the pci_ops methods add_bus and remove_bus.
> >
> > Note that the pci_subdev_regulators_add_bus() method is wrapped for two
> > reasons:
> >
> >    1. To achieve link up after the voltage regulators are turned on.
> >
> >    2. If, in the case of an unsuccessful link up, to redirect any PCIe
> >       accesses to subdevices, e.g. the scan for DEV/ID.  This redirection
> >       is needed because the Broadcom PCIe HW will issue a CPU abort if such
> >       an access is made when the link is down.
> >
> > [bhelgaas: fold in
> > https://lore.kernel.org/r/20220112013100.48029-1-jim2101024@gmail.com]
> > Link: https://lore.kernel.org/r/20220106160332.2143-7-jim2101024@gmail.com
> > Signed-off-by: Jim Quinlan <jim2101024@gmail.com>
> > ---
> >  drivers/pci/controller/pcie-brcmstb.c | 86 ++++++++++++++++++++++++---
> >  1 file changed, 77 insertions(+), 9 deletions(-)
> >
> > diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> > index 661d3834c6da..a86bf502a265 100644
> > --- a/drivers/pci/controller/pcie-brcmstb.c
> > +++ b/drivers/pci/controller/pcie-brcmstb.c
> > @@ -196,6 +196,8 @@ static inline void brcm_pcie_bridge_sw_init_set_generic(struct brcm_pcie *pcie,
> >  static inline void brcm_pcie_perst_set_4908(struct brcm_pcie *pcie, u32 val);
> >  static inline void brcm_pcie_perst_set_7278(struct brcm_pcie *pcie, u32 val);
> >  static inline void brcm_pcie_perst_set_generic(struct brcm_pcie *pcie, u32 val);
> > +static int brcm_pcie_linkup(struct brcm_pcie *pcie);
> > +static int brcm_pcie_add_bus(struct pci_bus *bus);
>
> I think the brcm_pcie_add_bus() declaration is unnecessary.
Will remove.

>
> The brcm_pcie_linkup() one is probably unnecessary, too, but would
> require a lot of reordering that I don't think we should do in this
> series.

I have a future commit that will remove all forward declarations.  I just
wanted to keep this the un-revert patchset simple.

>
> >  enum {
> >       RGR1_SW_INIT_1,
> > @@ -329,6 +331,8 @@ struct brcm_pcie {
> >       u32                     hw_rev;
> >       void                    (*perst_set)(struct brcm_pcie *pcie, u32 val);
> >       void                    (*bridge_sw_init_set)(struct brcm_pcie *pcie, u32 val);
> > +     bool                    refusal_mode;
> > +     struct subdev_regulators *sr;
> >  };
> >
> >  static inline bool is_bmips(const struct brcm_pcie *pcie)
> > @@ -497,6 +501,33 @@ static int pci_subdev_regulators_add_bus(struct pci_bus *bus)
> >       return 0;
> >  }
> >
> > +static int brcm_pcie_add_bus(struct pci_bus *bus)
> > +{
> > +     struct brcm_pcie *pcie = (struct brcm_pcie *) bus->sysdata;
> > +     int ret;
> > +
> > +     if (!bus->parent || !pci_is_root_bus(bus->parent))
> > +             return 0;
> > +
> > +     ret = pci_subdev_regulators_add_bus(bus);
> > +     if (ret)
> > +             return ret;
> > +
> > +     /* Grab the regulators for suspend/resume */
> > +     pcie->sr = bus->dev.driver_data;
> > +
> > +     /*
> > +      * If we have failed linkup there is no point to return an error as
> > +      * currently it will cause a WARNING() from pci_alloc_child_bus().
> > +      * We return 0 and turn on the "refusal_mode" so that any further
> > +      * accesses to the pci_dev just get 0xffffffff
> > +      */
> > +     if (brcm_pcie_linkup(pcie) != 0)
> > +             pcie->refusal_mode = true;
>
> Is there a bisection hole between the previous patch and this one?
> The previous patch sets .add_bus() to pci_subdev_regulators_add_bus(),
> so we'll turn on the regulators, but we don't know whether the link
> came up.  If it didn't come up, it looks like we might get a CPU abort
> when enumerating?

I don't think so.  At this commit, attempting the link-up is still
done before the call
to pci_host_probe().  Since there is no power there will be no link,
the probe will
fail and pci_host_probe() will never be invoked.

>
> I think we should split out the refusal_mode patch:
>
>   - Add refusal mode
>   - Add subdev regulator mechanism
>   - This patch (which would then be clearly about managing regulators
>     in suspend/resume, IIUC)

Will do.

>
> > +     return 0;
> > +}
> > +
> >  static void pci_subdev_regulators_remove_bus(struct pci_bus *bus)
> >  {
> >       struct device *dev = &bus->dev;
> > @@ -826,6 +857,18 @@ static void __iomem *brcm_pcie_map_conf(struct pci_bus *bus, unsigned int devfn,
> >       /* Accesses to the RC go right to the RC registers if slot==0 */
> >       if (pci_is_root_bus(bus))
> >               return PCI_SLOT(devfn) ? NULL : base + where;
> > +     if (pcie->refusal_mode) {
> > +             /*
> > +              * At this point we do not have link.  There will be a CPU
> > +              * abort -- a quirk with this controller --if Linux tries
> > +              * to read any config-space registers besides those
> > +              * targeting the host bridge.  To prevent this we hijack
> > +              * the address to point to a safe access that will return
> > +              * 0xffffffff.
> > +              */
> > +             writel(0xffffffff, base + PCIE_MISC_RC_BAR2_CONFIG_HI);
> > +             return base + PCIE_MISC_RC_BAR2_CONFIG_HI + (where & 0x3);
> > +     }
> >
> >       /* For devices, write to the config space index register */
> >       idx = PCIE_ECAM_OFFSET(bus->number, devfn, 0);
> > @@ -854,7 +897,7 @@ static struct pci_ops brcm_pcie_ops = {
> >       .map_bus = brcm_pcie_map_conf,
> >       .read = pci_generic_config_read,
> >       .write = pci_generic_config_write,
> > -     .add_bus = pci_subdev_regulators_add_bus,
> > +     .add_bus = brcm_pcie_add_bus,
> >       .remove_bus = pci_subdev_regulators_remove_bus,
> >  };
> >
> > @@ -1327,6 +1370,14 @@ static int brcm_pcie_suspend(struct device *dev)
> >               return ret;
> >       }
> >
> > +     if (pcie->sr) {
> > +             ret = regulator_bulk_disable(pcie->sr->num_supplies, pcie->sr->supplies);
> > +             if (ret) {
> > +                     dev_err(dev, "Could not turn off regulators\n");
> > +                     reset_control_reset(pcie->rescal);
> > +                     return ret;
> > +             }
> > +     }
> >       clk_disable_unprepare(pcie->clk);
> >
> >       return 0;
> > @@ -1344,9 +1395,17 @@ static int brcm_pcie_resume(struct device *dev)
> >       if (ret)
> >               return ret;
> >
> > +     if (pcie->sr) {
> > +             ret = regulator_bulk_enable(pcie->sr->num_supplies, pcie->sr->supplies);
> > +             if (ret) {
> > +                     dev_err(dev, "Could not turn on regulators\n");
> > +                     goto err_disable_clk;
> > +             }
> > +     }
> > +
> >       ret = reset_control_reset(pcie->rescal);
> >       if (ret)
> > -             goto err_disable_clk;
> > +             goto err_regulator;
> >
> >       ret = brcm_phy_start(pcie);
> >       if (ret)
> > @@ -1378,6 +1437,9 @@ static int brcm_pcie_resume(struct device *dev)
> >
> >  err_reset:
> >       reset_control_rearm(pcie->rescal);
> > +err_regulator:
> > +     if (pcie->sr)
> > +             regulator_bulk_disable(pcie->sr->num_supplies, pcie->sr->supplies);
> >  err_disable_clk:
> >       clk_disable_unprepare(pcie->clk);
> >       return ret;
> > @@ -1488,10 +1550,6 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >       if (ret)
> >               goto fail;
> >
> > -     ret = brcm_pcie_linkup(pcie);
> > -     if (ret)
> > -             goto fail;
> > -
> >       pcie->hw_rev = readl(pcie->base + PCIE_MISC_REVISION);
> >       if (pcie->type == BCM4908 && pcie->hw_rev >= BRCM_PCIE_HW_REV_3_20) {
> >               dev_err(pcie->dev, "hardware revision with unsupported PERST# setup\n");
> > @@ -1513,7 +1571,17 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >
> >       platform_set_drvdata(pdev, pcie);
> >
> > -     return pci_host_probe(bridge);
> > +     ret = pci_host_probe(bridge);
> > +     if (!ret && !brcm_pcie_link_up(pcie))
> > +             ret = -ENODEV;
> > +
> > +     if (ret) {
> > +             brcm_pcie_remove(pdev);
> > +             return ret;
> > +     }
> > +
> > +     return 0;
> > +
> >  fail:
> >       __brcm_pcie_remove(pcie);
> >       return ret;
> > @@ -1522,8 +1590,8 @@ static int brcm_pcie_probe(struct platform_device *pdev)
> >  MODULE_DEVICE_TABLE(of, brcm_pcie_match);
> >
> >  static const struct dev_pm_ops brcm_pcie_pm_ops = {
> > -     .suspend = brcm_pcie_suspend,
> > -     .resume = brcm_pcie_resume,
> > +     .suspend_noirq = brcm_pcie_suspend,
> > +     .resume_noirq = brcm_pcie_resume,
>
> Can you name these brcm_pcie_suspend_noirq() and
> brcm_pcie_resume_noirq() to match the hook names?
Yes.

Jim Quintlan
Broadcom STB

>
> >  };
> >
> >  static struct platform_driver brcm_pcie_driver = {
> > --
> > 2.17.1
> >
> >
> > _______________________________________________
> > linux-arm-kernel mailing list
> > linux-arm-kernel@lists.infradead.org
> > http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

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