[PATCH v5 0/3] PCI: Restrict pci transactions after pci suspend

Krishna chaitanya chundru
2022-08-03T11:29:11Z

If the endpoint device state is D0 and irq's are not freed, then
kernel try to mask interrupts in system suspend path by writing in to
the vector table (for MSIX interrupts) and config space (for MSI's).

These transactions are initiated in the pm suspend after pcie clocks got
disabled as part of platform driver pm suspend call. Due to it, these
transactions are resulting in un-clocked access and eventually to crashes.

So added a logic in qcom driver to restrict these unclocked access.
And updated the logic to check the link state before masking
or unmasking the interrupts.

And some devices are taking time to settle the link in L1ss, so added a
retry logic in the suspend ops.

Krishna chaitanya chundru (3):
PCI: qcom: Add system PM support
PCI: qcom: Restrict pci transactions after pci suspend
PCI: qcom: Add retry logic for link to be stable in L1ss

drivers/pci/controller/dwc/pcie-designware-host.c | 14 ++-
drivers/pci/controller/dwc/pcie-qcom.c | 117 +++++++++++++++++++++-
2 files changed, 127 insertions(+), 4 deletions(-)

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2.7.4