linux-kernel - Re: [PATCH v2 2/6] PCI: brcmstb: Split brcm_pcie

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Message-ID: <20220718131131.dclndpkkh7yojhj4@pali>
Date:   Mon, 18 Jul 2022 15:11:31 +0200
From:   Pali Rohár <pali@...nel.org>
To:     Jim Quinlan <jim2101024@...il.com>
Cc:     linux-pci@...r.kernel.org,
        Nicolas Saenz Julienne <nsaenz@...nel.org>,
        Bjorn Helgaas <bhelgaas@...gle.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Cyril Brulebois <kibi@...ian.org>,
        bcm-kernel-feedback-list@...adcom.com, james.quinlan@...adcom.com,
        Florian Fainelli <f.fainelli@...il.com>,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-rpi-kernel@...ts.infradead.org>,
        "moderated list:BROADCOM BCM2711/BCM2835 ARM ARCHITECTURE" 
        <linux-arm-kernel@...ts.infradead.org>,
        open list <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2 2/6] PCI: brcmstb: Split brcm_pcie_setup() into two
 funcs

Hello!

On Saturday 16 July 2022 18:24:49 Jim Quinlan wrote:
> @@ -948,6 +941,40 @@ static int brcm_pcie_setup(struct brcm_pcie *pcie)
>  	if (pcie->gen)
>  		brcm_pcie_set_gen(pcie, pcie->gen);
>  
> +	/* Don't advertise L0s capability if 'aspm-no-l0s' */
> +	aspm_support = PCIE_LINK_STATE_L1;
> +	if (!of_property_read_bool(pcie->np, "aspm-no-l0s"))
> +		aspm_support |= PCIE_LINK_STATE_L0S;
> +	tmp = readl(base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
> +	u32p_replace_bits(&tmp, aspm_support,
> +		PCIE_RC_CFG_PRIV1_LINK_CAPABILITY_ASPM_SUPPORT_MASK);
> +	writel(tmp, base + PCIE_RC_CFG_PRIV1_LINK_CAPABILITY);
> +
> +	/*
> +	 * For config space accesses on the RC, show the right class for
> +	 * a PCIe-PCIe bridge (the default setting is to be EP mode).
> +	 */
> +	tmp = readl(base + PCIE_RC_CFG_PRIV1_ID_VAL3);
> +	u32p_replace_bits(&tmp, 0x060400,

There is already macro PCI_CLASS_BRIDGE_PCI_NORMAL, so please use it
instead of magic constant.

I introduced it recently in commit:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=904b10fb189cc15376e9bfce1ef0282e68b0b004

> +			  PCIE_RC_CFG_PRIV1_ID_VAL3_CLASS_CODE_MASK);
> +	writel(tmp, base + PCIE_RC_CFG_PRIV1_ID_VAL3);
> +
> +	return 0;
> +}