linux-kernel - Re: [PATCH v2 2/6] PCI: brcmstb: Split brcm_pcie_setup() into two funcs

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Date:   Mon, 18 Jul 2022 12:05:28 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     Pali Rohár <pali@...nel.org>,
        Jim Quinlan <jim2101024@...il.com>,
        "open list:PCI NATIVE HOST BRIDGE AND ENDPOINT DRIVERS" 
        <linux-pci@...r.kernel.org>,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] PCI: brcmstb: Split brcm_pcie_setup() into two
 funcs

On Mon, Jul 18, 2022 at 09:37:08AM -0400, Jim Quinlan wrote:
> On Mon, Jul 18, 2022 at 9:11 AM Pali Rohár <pali@...nel.org> wrote:
> >
> > Hello!
> >
> > On Saturday 16 July 2022 18:24:49 Jim Quinlan wrote:
> > > @@ -948,6 +941,40 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
> > >       if (pcie->gen)
> > >               brcm_pcie_set_gen(pcie, pcie->gen);
> > >
> > > +     /* Don't advertise L0s capability if 'aspm-no-l0s' */
> > > +     aspm_support = PCIE_LINK_STATE_L1;
> > > +     if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
> > > +             aspm_support |= PCIE_LINK_STATE_L0S;
> > > +     tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
> > > +     u32p_replace_bits(&tmp, aspm_support,
> > > +             PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
> > > +     writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
> > > +
> > > +     /*
> > > +      * For config space accesses on the RC, show the right class for
> > > +      * a PCIe-PCIe bridge (the default setting is to be EP mode).
> > > +      */
> > > +     tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
> > > +     u32p_replace_bits(&tmp, 0x060400,
> >
> > There is already macro PCI_CLASS_BRIDGE_PCI_NORMAL, so please use it
> > instead of magic constant.
> 
> Will do, thanks.

I can fix that up locally.

> > I introduced it recently in commit:
> > https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=904b10fb189cc15376e9bfce1ef0282e68b0b004
> >
> > > +                       PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
> > > +     writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
> > > +
> > > +     return 0;
> > > +}

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