linux-kernel - Re: [PATCH v11 1/3] PCI: Add macro PCIE_PME_TO_L2_TIMEOUT

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Message-ID: <ZNyi2BkInSyUPYEU@lpieralisi>
Date:   Wed, 16 Aug 2023 12:20:08 +0200
From:   Lorenzo Pieralisi <lpieralisi@...nel.org>
To:     Frank Li <Frank.Li@....com>, bhelgaas@...gle.com
Cc:     helgaas@...nel.org, devicetree@...r.kernel.org,
        gustavo.pimentel@...opsys.com, imx@...ts.linux.dev, kw@...ux.com,
        leoyang.li@....com, linux-arm-kernel@...ts.infradead.org,
        linux-imx@....com, linux-kernel@...r.kernel.org,
        linux-pci@...r.kernel.org, lorenzo.pieralisi@....com,
        mani@...nel.org, manivannan.sadhasivam@...aro.org,
        minghuan.lian@....com, mingkai.hu@....com, robh+dt@...nel.org,
        roy.zang@....com, shawnguo@...nel.org, zhiqiang.hou@....com
Subject: Re: [PATCH v11 1/3] PCI: Add macro PCIE_PME_TO_L2_TIMEOUT_US

On Wed, Aug 09, 2023 at 11:35:38AM -0400, Frank Li wrote:
> Introduce the PCIE_PME_TO_L2_TIMEOUT_US macro to facilitate checking the
> L2 ready timeout in the PCI subsystem.
> 
> Acked-by: Manivannan Sadhasivam <mani@...nel.org>
> Signed-off-by: Frank Li <Frank.Li@....com>
> ---
>  drivers/pci/pci.h | 6 ++++++
>  1 file changed, 6 insertions(+)

This patch requires Bjorn's ACK.

Lorenzo

> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index a4c3974340576..da8156663c825 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -13,6 +13,12 @@
>  
>  #define PCIE_LINK_RETRAIN_TIMEOUT_MS	1000
>  
> +/*
> + * PCIe r6.0, sec 5.3.3.2.1 <PME Synchronization>
> + * Recommends 1ms to 10ms timeout to check L2 ready.
> + */
> +#define PCIE_PME_TO_L2_TIMEOUT_US	10000
> +
>  extern const unsigned char pcie_link_speed[];
>  extern bool pci_early_dump;
>  
> -- 
> 2.34.1
>