linux-kernel - Re: [PATCH 1/3] PCI: apple: GPIO handling nitfixes

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Message-ID: <87h768i6ci.wl-maz@kernel.org>
Date:   Mon, 02 May 2022 11:20:13 +0100
From:   Marc Zyngier <maz@...nel.org>
To:     Hector Martin <marcan@...can.st>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Alyssa Rosenzweig <alyssa@...enzweig.io>,
        Sven Peter <sven@...npeter.dev>, linux-pci@...r.kernel.org,
        linux-kernel@...r.kernel.org, stable@...r.kernel.org
Subject: Re: [PATCH 1/3] PCI: apple: GPIO handling nitfixes

On Mon, 02 May 2022 10:38:30 +0100,
Hector Martin <marcan@...can.st> wrote:
> 
> - Use devm managed GPIO getter
> - GPIO ops can sleep in this context
> 
> Fixes: 1e33888fbe44 ("PCI: apple: Add initial hardware bring-up")
> Cc: stable@...r.kernel.org

Why the Cc: stable? I'd guess that at a push, the devm_*() usage help
with potential memory leaks when the driver fails to probe, but it
would be good to call that out in the commit message.

> Signed-off-by: Hector Martin <marcan@...can.st>
> ---
>  drivers/pci/controller/pcie-apple.c | 8 ++++----
>  1 file changed, 4 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-apple.c b/drivers/pci/controller/pcie-apple.c
> index a2c3c207a04b..e0c06c0ee731 100644
> --- a/drivers/pci/controller/pcie-apple.c
> +++ b/drivers/pci/controller/pcie-apple.c
> @@ -516,8 +516,8 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
>  	u32 stat, idx;
>  	int ret, i;
>  
> -	reset = gpiod_get_from_of_node(np, "reset-gpios", 0,
> -				       GPIOD_OUT_LOW, "PERST#");
> +	reset = devm_gpiod_get_from_of_node(pcie->dev, np, "reset-gpios", 0,
> +					    GPIOD_OUT_LOW, "PERST#");
>  	if (IS_ERR(reset))
>  		return PTR_ERR(reset);
>  
> @@ -541,7 +541,7 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
>  	rmw_set(PORT_APPCLK_EN, port->base + PORT_APPCLK);
>  
>  	/* Assert PERST# before setting up the clock */
> -	gpiod_set_value(reset, 1);
> +	gpiod_set_value_cansleep(reset, 1);
>  
>  	ret = apple_pcie_setup_refclk(pcie, port);
>  	if (ret < 0)
> @@ -552,7 +552,7 @@ static int apple_pcie_setup_port(struct apple_pcie *pcie,
>  
>  	/* Deassert PERST# */
>  	rmw_set(PORT_PERST_OFF, port->base + PORT_PERST);
> -	gpiod_set_value(reset, 0);
> +	gpiod_set_value_cansleep(reset, 0);
>  
>  	/* Wait for 100ms after PERST# deassertion (PCIe r5.0, 6.6.1) */
>  	msleep(100);

Otherwise:

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

	M.

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