linux-kernel - Re: [PATCH v3 05/13] PCI: brcmstb: Add suspend and resume pm

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Date:   Wed, 3 Jun 2020 15:24:38 -0500
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Jim Quinlan <james.quinlan@...adcom.com>
Cc:     linux-pci@...r.kernel.org, Christoph Hellwig <hch@....de>,
        Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        bcm-kernel-feedback-list@...adcom.com,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Florian Fainelli <f.fainelli@...il.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 v3 05/13] PCI: brcmstb: Add suspend and resume pm_ops

On Wed, Jun 03, 2020 at 03:20:37PM -0400, Jim Quinlan wrote:
> From: Jim Quinlan <jquinlan@...adcom.com>
> 
> Broadcom Set-top (BrcmSTB) boards typically support S2, S3, and S5 suspend
> and resume.  Now the PCIe driver may do so as well.
> 
> Signed-off-by: Jim Quinlan <jquinlan@...adcom.com>
> ---
>  drivers/pci/controller/pcie-brcmstb.c | 49 +++++++++++++++++++++++++++
>  1 file changed, 49 insertions(+)
> 
> diff --git a/drivers/pci/controller/pcie-brcmstb.c b/drivers/pci/controller/pcie-brcmstb.c
> index 7c707e483181..f444751e247c 100644
> --- a/drivers/pci/controller/pcie-brcmstb.c
> +++ b/drivers/pci/controller/pcie-brcmstb.c
> @@ -979,6 +979,49 @@ static void brcm_pcie_turn_off(struct brcm_pcie *pcie)
>  	brcm_pcie_bridge_sw_init_set(pcie, 1);
>  }
>  
> +static int brcm_pcie_suspend(struct device *dev)
> +{
> +	struct brcm_pcie *pcie = dev_get_drvdata(dev);
> +	int ret = 0;
> +
> +	brcm_pcie_turn_off(pcie);
> +	clk_disable_unprepare(pcie->clk);
> +
> +	return ret;

No need for "ret".

> +}