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PCI: Add T_PVPERL macro

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[ Upstream commit 164f66be0c2523e65df41b755c41b7c9ff58035a ]

According to the PCIe CEM r5.0, sec 2.9.2, Power stable to PERST#
inactive interval is 100 ms as minimum. Add a macro so that the PCIe
controller drivers can make use of it.

Link: https://lore.kernel.org/linux-pci/20231018085631.1121289-2-yoshihiro.shimoda.uh@renesas.com
Signed-off-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Signed-off-by: Krzysztof Wilczyński <kwilczynski@kernel.org>
Reviewed-by: Manivannan Sadhasivam <manivannan.sadhasivam@linaro.org>
Reviewed-by: Serge Semin <fancer.lancer@gmail.com>
Stable-dep-of: 22a9120479a4 ("PCI: j721e: Deassert PERST# after a delay of PCIE_T_PVPERL_MS milliseconds")
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yoshihiro Shimoda
2023-10-18 17:56:17 +09:00
committed by Greg Kroah-Hartman
parent ed16873faf
commit 47203d68f5
1 changed files with 3 additions and 0 deletions
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3
drivers/pci/pci.h
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@@ -13,6 +13,9 @@
#define PCIE_LINK_RETRAIN_TIMEOUT_MS 1000
/* Power stable to PERST# inactive from PCIe card Electromechanical Spec */
#define PCIE_T_PVPERL_MS 100
/*
* PCIe r6.0, sec 5.3.3.2.1 <PME Synchronization>
* Recommends 1ms to 10ms timeout to check L2 ready.