linux-kernel - Re: [PATCH v13 09/10] PCI: kirin: fix poweroff sequence

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Date:   Mon, 18 Oct 2021 11:21:27 +0100
From:   Lorenzo Pieralisi <lorenzo.pieralisi@....com>
To:     Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
Cc:     linuxarm@...wei.com, mauro.chehab@...wei.com,
        Krzysztof Wilczyński <kw@...ux.com>,
        Songxiaowei <songxiaowei@...ilicon.com>,
        Binghui Wang <wangbinghui@...ilicon.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh@...nel.org>, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org
Subject: Re: [PATCH v13 09/10] PCI: kirin: fix poweroff sequence

On Mon, Oct 18, 2021 at 08:07:34AM +0100, Mauro Carvalho Chehab wrote:
> This driver currently doesn't call dw_pcie_host_deinit()
> at the .remove() callback. This can cause an OOPS if the driver
> is unbound.

This looks like a fix, it has to be marked as such.

> While here, add a poweroff function, in order to abstract
> between the internal and external PHY logic.
> 
> Acked-by: Xiaowei Song <songxiaowei@...ilicon.com>
> Signed-off-by: Mauro Carvalho Chehab <mchehab+huawei@...nel.org>
> ---
> 
> See [PATCH v13 00/10] at: https://lore.kernel.org/all/cover.1634539769.git.mchehab+huawei@kernel.org/
> 
>  drivers/pci/controller/dwc/pcie-kirin.c | 30 ++++++++++++++++---------
>  1 file changed, 20 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/pci/controller/dwc/pcie-kirin.c b/drivers/pci/controller/dwc/pcie-kirin.c
> index b17a194cf78d..ffc63d12f8ed 100644
> --- a/drivers/pci/controller/dwc/pcie-kirin.c
> +++ b/drivers/pci/controller/dwc/pcie-kirin.c
> @@ -680,6 +680,23 @@ static const struct dw_pcie_host_ops kirin_pcie_host_ops = {
>  	.host_init = kirin_pcie_host_init,
>  };
>  
> +static int kirin_pcie_power_off(struct kirin_pcie *kirin_pcie)
> +{
> +	int i;
> +
> +	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
> +		return hi3660_pcie_phy_power_off(kirin_pcie);
> +
> +	for (i = 0; i < kirin_pcie->n_gpio_clkreq; i++) {
> +		gpio_direction_output(kirin_pcie->gpio_id_clkreq[i], 1);
> +	}

It looks like you are adding functionality here (ie gpio), not
just wrapping common code in a function.

Also, remove the braces, they aren't needed.

Lorenzo

> +
> +	phy_power_off(kirin_pcie->phy);
> +	phy_exit(kirin_pcie->phy);
> +
> +	return 0;
> +}
> +
>  static int kirin_pcie_power_on(struct platform_device *pdev,
>  			       struct kirin_pcie *kirin_pcie)
>  {
> @@ -725,12 +742,7 @@ static int kirin_pcie_power_on(struct platform_device *pdev,
>  
>  	return 0;
>  err:
> -	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY) {
> -		hi3660_pcie_phy_power_off(kirin_pcie);
> -	} else {
> -		phy_power_off(kirin_pcie->phy);
> -		phy_exit(kirin_pcie->phy);
> -	}
> +	kirin_pcie_power_off(kirin_pcie);
>  
>  	return ret;
>  }
> @@ -739,11 +751,9 @@ static int __exit kirin_pcie_remove(struct platform_device *pdev)
>  {
>  	struct kirin_pcie *kirin_pcie = platform_get_drvdata(pdev);
>  
> -	if (kirin_pcie->type == PCIE_KIRIN_INTERNAL_PHY)
> -		return hi3660_pcie_phy_power_off(kirin_pcie);
> +	dw_pcie_host_deinit(&kirin_pcie->pci->pp);
>  
> -	phy_power_off(kirin_pcie->phy);
> -	phy_exit(kirin_pcie->phy);
> +	kirin_pcie_power_off(kirin_pcie);
>  
>  	return 0;
>  }
> -- 
> 2.31.1
>