linux-kernel - Re: [v2,2/3] PCI: mediatek: Add new generation controller support

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Message-ID: <1ac4ba40a031169b968e3084c132579db921033c.camel@pengutronix.de>
Date:   Fri, 11 Sep 2020 16:33:21 +0200
From:   Philipp Zabel <p.zabel@...gutronix.de>
To:     Jianjun Wang <jianjun.wang@...iatek.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Rob Herring <robh+dt@...nel.org>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Ryder Lee <ryder.lee@...iatek.com>
Cc:     Matthias Brugger <matthias.bgg@...il.com>,
        Mauro Carvalho Chehab <mchehab+huawei@...nel.org>,
        davem@...emloft.net, linux-pci@...r.kernel.org,
        linux-mediatek@...ts.infradead.org, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
        Sj Huang <sj.huang@...iatek.com>
Subject: Re: [v2,2/3] PCI: mediatek: Add new generation controller support

Hi Jianjun,

On Thu, 2020-09-10 at 11:45 +0800, Jianjun Wang wrote:
> MediaTek's PCIe host controller has three generation HWs, the new
> generation HW is an individual bridge, it supoorts Gen3 speed and
> up to 256 MSI interrupt numbers for multi-function devices.
> 
> Add support for new Gen3 controller which can be found on MT8192.
> 
> Signed-off-by: Jianjun Wang <jianjun.wang@...iatek.com>
> Acked-by: Ryder Lee <ryder.lee@...iatek.com>
> ---
>  drivers/pci/controller/Kconfig              |   14 +
>  drivers/pci/controller/Makefile             |    1 +
>  drivers/pci/controller/pcie-mediatek-gen3.c | 1076 +++++++++++++++++++
>  3 files changed, 1091 insertions(+)
>  create mode 100644 drivers/pci/controller/pcie-mediatek-gen3.c
> 
[...]
> diff --git a/drivers/pci/controller/pcie-mediatek-gen3.c b/drivers/pci/controller/pcie-mediatek-gen3.c
> new file mode 100644
> index 000000000000..f8c8bdf88d33
> --- /dev/null
> +++ b/drivers/pci/controller/pcie-mediatek-gen3.c
[...]
> +static int mtk_pcie_power_up(struct mtk_pcie_port *port)
> +{
> +	struct device *dev = port->dev;
> +	int err;
> +
> +	port->phy_reset = devm_reset_control_get_optional(dev, "phy-rst");

Please use devm_reset_control_get_optional_exclusive() instead.

> +	if (PTR_ERR(port->phy_reset) == -EPROBE_DEFER)
> +		return PTR_ERR(port->phy_reset);

This should be

	if (IS_ERR(port->phy_reset))
		return PTR_ERR(port->phy_reset);

there is no reason to continue if this throws -ENOMEM, for example.

regards
Philipp