linux-kernel - Re: [PATCH v5 5/6] PCI: brcmstb: Do not turn off regulators if EP can wake up

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Message-ID: <CA+-6iNyT5-X63bdioNQaY=htyev2KPEhELQAFcvH06sLMVo-qQ@mail.gmail.com>
Date:   Fri, 22 Oct 2021 11:06:21 -0400
From:   Jim Quinlan <james.quinlan@...adcom.com>
To:     Mark Brown <broonie@...nel.org>
Cc:     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>,
        Rob Herring <robh@...nel.org>,
        "maintainer:BROADCOM BCM7XXX ARM ARCHITECTURE" 
        <bcm-kernel-feedback-list@...adcom.com>,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.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 v5 5/6] PCI: brcmstb: Do not turn off regulators if EP can
 wake up

On Fri, Oct 22, 2021 at 10:39 AM Mark Brown <broonie@...nel.org> wrote:
>
> On Fri, Oct 22, 2021 at 10:06:58AM -0400, Jim Quinlan wrote:
>
> > +enum {
> > +     TURN_OFF,               /* Turn regulators off, unless an EP is wakeup-capable */
> > +     TURN_OFF_ALWAYS,        /* Turn regulators off, no exceptions */
> > +     TURN_ON,                /* Turn regulators on, unless pcie->ep_wakeup_capable */
> > +};
> > +
> > +static int brcm_set_regulators(struct brcm_pcie *pcie, int how)
> > +{
> > +     struct pci_host_bridge *bridge = pci_host_bridge_from_priv(pcie);
>
> I can't help but think this would be easier to follow as multiple
> functions, there is very little code sharing between the different
> paths especially the on and off paths.
Agree; I just wanted to make less changes to struct pci_host_bridge.  Will fix.

>
> >       if (pcie->num_supplies) {
> > -             (void)brcm_set_regulators(pcie, false);
> > +             (void)brcm_set_regulators(pcie, TURN_OFF_ALWAYS);
>
> I should've mentioned this on the earlier path but it's not normal Linux
> style to cast return values to void and looks worrying.
Got it.

Thanks,
JimQ