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: <YXLNLWNKkcYodqCG@sirena.org.uk>
Date:   Fri, 22 Oct 2021 15:39:41 +0100
From:   Mark Brown <broonie@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Rob Herring <robh@...nel.org>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...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 10:06:58AM -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.

>  	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.

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