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

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Date:   Wed,  9 Aug 2023 11:35:38 -0400
From:   Frank Li <Frank.Li@....com>
To:     helgaas@...nel.org
Cc:     Frank.li@....com, bhelgaas@...gle.com, 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,
        lpieralisi@...nel.org, 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: [PATCH v11 1/3] PCI: Add macro PCIE_PME_TO_L2_TIMEOUT_US

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(+)

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