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(-) -- 2.7.4
