linux-kernel - Re: [PATCH 1/2] PCI: dwc: kirin: add PCIe Driver for HiSilicon Kirin SoC

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Date:   Wed, 17 May 2017 22:29:17 +0200
From:   Arnd Bergmann <arnd@...db.de>
To:     Song Xiaowei <songxiaowei@...ilicon.com>
Cc:     Bjorn Helgaas <bhelgaas@...gle.com>, Kishon <kishon@...com>,
        Jingoo Han <jingoohan1@...il.com>,
        Tomasz Nowicki <tn@...ihalf.com>,
        Keith Busch <keith.busch@...el.com>, niklas.cassel@...s.com,
        Duc Dang <dhdang@....com>, liudongdong3@...wei.com,
        puck.chen@...ilicon.com, Guodong Xu <guodong.xu@...aro.org>,
        wangbinghui@...ilicon.com, suzhuangluan@...ilicon.com,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        linux-pci <linux-pci@...r.kernel.org>
Subject: Re: [PATCH 1/2] PCI: dwc: kirin: add PCIe Driver for HiSilicon Kirin SoC

On Fri, May 12, 2017 at 3:51 AM, Song Xiaowei <songxiaowei@...ilicon.com> wrote:
> From: songxiaowei <songxiaowei@...ilicon.com>

Looks good overall, just a few details:

Please fix your ~/.gitconfig to contain the same real name ("Song Xiaowei"
instead of "songxiaowei") that you use for sending the emails.

> +
> +static int kirin_pcie_phy_init(struct kirin_pcie *kirin_pcie)
> +{
...
> +       reg_val = kirin_apb_phy_readl(kirin_pcie, 0x400);
> +       while (reg_val & pipe_clk_stable) {
> +               udelay(100);
> +               if (time == 0) {
> +                       dev_err(kirin_pcie->pci->dev, "PIPE clk is not stable\n");
> +                       return -EINVAL;
> +               }
> +               time--;
> +               reg_val = kirin_apb_phy_readl(kirin_pcie, 0x400);
> +       }

If this is not called with interrupts disabled, please use a
sleeping function (e.g. msleep(1)) as the delay and compare
against ktime_before() to see how much total time has expired
when waiting for a timeout, instead of using a counter.

> diff --git a/drivers/pci/dwc/pcie-kirin.h b/drivers/pci/dwc/pcie-kirin.h
> new file mode 100644
> index 000000000000..ad9a3b427298
> --- /dev/null
> +++ b/drivers/pci/dwc/pcie-kirin.h
> @@ -0,0 +1,79 @@
> +/*
> + * PCIe host controller driver for Kirin 960 SoCs
> + *
> + * Copyright (C) 2015 Huawei Electronics Co., Ltd.
> + *             http://www.huawei.com
> + *
> + * Author: Xiaowei Song <songxiaowei@...wei.com>

The header is only used in one .c file, so just remove it and
add the contents to that file.

    Arnd