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PCI/PM: Shorten pci_bridge_wait_for_secondary_bus() wait time for slo…
…w links With slow links (<= 5GT/s) active link reporting is not mandatory, so if a device is disconnected during system sleep we might end up waiting for it to respond for ~60s, which slows down resume time. PCIe r6.0, sec 6.6.1, mandates that software must wait for at least 1s before it can assume a device is broken, so use that minimum requirement for slow links and bail out if the device doesn't respond within 1s. However, if the port supports active link reporting we can wait longer as we do with the fast links. This should make system resume time faster for slow links as well while still following the PCIe spec. While there move the PCI_RESET_WAIT constant into pci.c because it is not used outside of that file anymore. Link: https://lore.kernel.org/r/20230425064751.24951-1-mika.westerberg@linux.intel.com Signed-off-by: Mika Westerberg <mika.westerberg@linux.intel.com> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com> Reviewed-by: Lukas Wunner <lukas@wunner.de> Reviewed-by: Kuppuswamy Sathyanarayanan <sathyanarayanan.kuppuswamy@linux.intel.com>
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Mika Westerberg
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Bjorn Helgaas
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Jun 6, 2023
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