linux-kernel - Re: [PATCH v8 2/2] PCI: amlogic: Add the Amlogic Meson PCIe controller driver

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Message-ID: <20181218224708.GB22610@google.com>
Date:   Tue, 18 Dec 2018 16:47:08 -0600
From:   Bjorn Helgaas <helgaas@...nel.org>
To:     Hanjie Lin <hanjie.lin@...ogic.com>
Cc:     Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Yue Wang <yue.wang@...ogic.com>,
        Kevin Hilman <khilman@...libre.com>,
        Carlo Caione <carlo@...one.org>,
        Jerome Brunet <jbrunet@...libre.com>,
        Rob Herring <robh@...nel.org>,
        Gustavo Pimentel <gustavo.pimentel@...opsys.com>,
        Shawn Lin <shawn.lin@...k-chips.com>,
        Philippe Ombredanne <pombredanne@...b.com>,
        Cyrille Pitchen <cyrille.pitchen@...e-electrons.com>,
        linux-kernel@...r.kernel.org, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org,
        linux-amlogic@...ts.infradead.org,
        Yixun Lan <yixun.lan@...ogic.com>,
        Liang Yang <liang.yang@...ogic.com>,
        Jianxin Pan <jianxin.pan@...ogic.com>,
        Qiufang Dai <qiufang.dai@...ogic.com>,
        Jian Hu <jian.hu@...ogic.com>
Subject: Re: [PATCH v8 2/2] PCI: amlogic: Add the Amlogic Meson PCIe
 controller driver

On Tue, Dec 18, 2018 at 04:04:46PM +0800, Hanjie Lin wrote:
> From: Yue Wang <yue.wang@...ogic.com>
> 
> The Amlogic Meson PCIe host controller is based on the Synopsys DesignWare
> PCI core. This patch adds the driver support for Meson PCIe controller.

I don't have any comments on the code itself; just the trivial things
below.  No need to repost for these unless you're changing something
else.

I thought it looked very pretty overall, thanks for paying attention
to that!

> +static int meson_size_to_payload(struct meson_pcie *mp, int size)
> +{
> +	struct device *dev = mp->pci.dev;
> +
> +	/*
> +	 * dwc supports 2^(val+7) payload size, which val is 0~5 default to 1.
> +	 * So if input size is not 2^order alignment or less than 2^7 or bigger
> +	 * than 2^12, just set to default size 2^(1+7).
> +	 */
> +	if (!is_power_of_2(size) || size < 128 || size > 4096) {
> +		dev_warn(dev, "playload size %d, set to default 256\n", size);

s/playload/payload/

> +static void meson_set_max_payload(struct meson_pcie *mp, int size)
> +{
> +	u32 val = 0;

Unnecessary initialization.

> +	int max_payload_size = meson_size_to_payload(mp, size);
> +
> +	val = meson_elb_readl(mp, PCIE_DEV_CTRL_DEV_STUS);

> +static int meson_pcie_rd_own_conf(struct pcie_port *pp, int where, int size,
> +				  u32 *val)
> +{
> +	struct dw_pcie *pci = to_dw_pcie_from_pp(pp);
> +	int ret;
> +
> +	ret = dw_pcie_read(pci->dbi_base + where, size, val);
> +	if (ret != PCIBIOS_SUCCESSFUL)
> +		return ret;
> +
> +	/*
> +	 * There is a bug in the MESON AXG pcie controller whereby software
> +	 * cannot programme the PCI_CLASS_DEVICE register, so we must fabricate
> +	 * the return value in the config accessors.

s/pcie/PCIe/
s/programme/program/ (IIUC, "programme" is British and only used as a
noun, where here you need a verb)

> +static int meson_pcie_link_up(struct dw_pcie *pci)
> +{
> +	struct meson_pcie *mp = to_meson_pcie(pci);
> +	struct device *dev = pci->dev;
> +	u32 smlh_up = 0;
> +	u32 ltssm_up = 0;
> +	u32 rdlh_up = 0;

Unnecessary initialization of smlh_up, ltssm_up, and rdlh_up.

> +	u32 speed_okay = 0;
> +	u32 cnt = 0;
> +	u32 state12, state17;
> +
> +	do {
> +		state12 = meson_cfg_readl(mp, PCIE_CFG_STATUS12);
> +		state17 = meson_cfg_readl(mp, PCIE_CFG_STATUS17);
> +		smlh_up = IS_SMLH_LINK_UP(state12);
> +		rdlh_up = IS_RDLH_LINK_UP(state12);
> +		ltssm_up = IS_LTSSM_UP(state12);

> +	dev_err(dev, "Error: Wait linkup timeout.\n");

Message doesn't match others from driver (capitalization and trailing
period).

> +			dev_err(dev, "failed to get msi irq\n");

s/msi irq/MSI IRQ/

> +	ret = meson_add_pcie_port(mp, pdev);
> +	if (ret < 0) {
> +		dev_err(dev, "Add PCIE port failed, %d\n", ret);

s/PCIE/PCIe/

All the messages in this function are capitalized differently than
other messages in the driver.

Bjorn