linux-kernel - [PATCH v12 1/3] PCI: Add macro PCIE_PME_TO_L2_TIMEOUT

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Message-Id: <20230821184815.2167131-2-Frank.Li@nxp.com>
Date:   Mon, 21 Aug 2023 14:48:13 -0400
From:   Frank Li <Frank.Li@....com>
To:     frank.li@....com
Cc:     bhelgaas@...gle.com, devicetree@...r.kernel.org,
        gustavo.pimentel@...opsys.com, helgaas@...nel.org,
        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 v12 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 a4c397434057..da8156663c82 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