linux-kernel - Re: [PATCH] PCI: apple: Enable clock gating

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Date:   Wed, 17 Nov 2021 17:56:46 +0000
From:   Marc Zyngier <maz@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: apple: Enable clock gating

On Wed, 17 Nov 2021 14:19:16 +0000,
Hector Martin <marcan@...can.st> wrote:
> 
> These pokes are not required to make the PCIe port work, but it sounds
> like this should save some power at least.
> 
> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/pci/controller/pcie-apple.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index 420c291a5c68..03bfe977c579 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -553,6 +553,9 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
>  		return ret;
>  	}
>  
> +	rmw_clear(PORT_REFCLK_CGDIS, port->base + PORT_REFCLK);
> +	rmw_clear(PORT_APPCLK_CGDIS, port->base + PORT_APPCLK);
> +
>  	ret = apple_pcie_port_setup_irq(port);
>  	if (ret)
>  		return ret;
> -- 
> 2.33.0
> 
> 

Acked-by: Marc Zyngier <maz@...nel.org>
Tested-by: Marc Zyngier <maz@...nel.org>

	M.

-- 
Without deviation from the norm, progress is not possible.