linux-kernel - Re: [PATCH] PCI: iproc: Set all 24 bits of PCI class code

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Message-ID: <244e74d9-1b46-2abc-6c2a-c089fa5b68b4@broadcom.com>
Date:   Wed, 5 Jan 2022 09:51:48 -0800
From:   Ray Jui <ray.jui@...adcom.com>
To:     Pali Rohár <pali@...nel.org>,
        Roman Bacik <roman.bacik@...adcom.com>,
        Lorenzo Pieralisi <lorenzo.pieralisi@....com>,
        Rob Herring <robh@...nel.org>,
        Krzysztof Wilczyński <kw@...ux.com>,
        Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     bcm-kernel-feedback-list@...adcom.com, linux-pci@...r.kernel.org,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] PCI: iproc: Set all 24 bits of PCI class code

Hi Pali,

On 1/5/2022 1:35 AM, Pali Rohár wrote:
> Register 0x43c in its low 24 bits contains PCI class code.
> 
> Update code to set all 24 bits of PCI class code and not only upper 16 bits
> of PCI class code.
> 
> Use a new macro PCI_CLASS_BRIDGE_PCI_NORMAL which represents whole 24 bits
> of normal PCI bridge class.
> 
> Signed-off-by: Pali Rohár <pali@...nel.org>
> 
> ---
> Roman helped me with this change and confirmed that class code is stored
> really in bits [23:0] of custom register 0x43c (normally class code is
> stored in bits [31:8] of pci register 0x08).
> 
> This patch depends on patch which adds PCI_CLASS_BRIDGE_PCI_NORMAL macro:
> https://lore.kernel.org/linux-pci/20211220145140.31898-1-pali@kernel.org/
> ---
>  drivers/pci/controller/pcie-iproc.c | 9 ++++-----
>  1 file changed, 4 insertions(+), 5 deletions(-)
> 
> diff --git a/drivers/pci/controller/pcie-iproc.c b/drivers/pci/controller/pcie-iproc.c
> index 3df4ab209253..2519201b0e51 100644
> --- a/drivers/pci/controller/pcie-iproc.c
> +++ b/drivers/pci/controller/pcie-iproc.c
> @@ -789,14 +789,13 @@ static int iproc_pcie_check_link(struct iproc_pcie *pcie)
>  		return -EFAULT;
>  	}
>  
> -	/* force class to PCI_CLASS_BRIDGE_PCI (0x0604) */
> +	/* force class to PCI_CLASS_BRIDGE_PCI_NORMAL (0x060400) */
>  #define PCI_BRIDGE_CTRL_REG_OFFSET	0x43c
> -#define PCI_CLASS_BRIDGE_MASK		0xffff00
> -#define PCI_CLASS_BRIDGE_SHIFT		8
> +#define PCI_BRIDGE_CTRL_REG_CLASS_MASK	0xffffff
>  	iproc_pci_raw_config_read32(pcie, 0, PCI_BRIDGE_CTRL_REG_OFFSET,
>  				    4, &class);
> -	class &= ~PCI_CLASS_BRIDGE_MASK;
> -	class |= (PCI_CLASS_BRIDGE_PCI << PCI_CLASS_BRIDGE_SHIFT);
> +	class &= ~PCI_BRIDGE_CTRL_REG_CLASS_MASK;
> +	class |= PCI_CLASS_BRIDGE_PCI_NORMAL;
>  	iproc_pci_raw_config_write32(pcie, 0, PCI_BRIDGE_CTRL_REG_OFFSET,
>  				     4, class);
>  

I have two comments:

1. You do not seem to generate the email list using the
get_maintainer.pl script, so the two maintainers for Broadcom ARM
architecture (Ray Jui and Scott Branden) are left out.

2. I suppose 'PCI_CLASS_BRIDGE_PCI_NORMAL' is defined in some common PCI
header in a separate patch as described in the commit message. Then how
come these patches are not constructed with a patch series?

Other than, the change itself is exactly what I sent to Roman and looks
good to me. Thanks.

Acked-by: Ray Jui <ray.jui@...adcom.com>

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