mbox series

[v4,0/2] PCI: Restrict pci transactions after pci suspend

Message ID 1657118425-10304-1-git-send-email-quic_krichai@quicinc.com
Headers show
Series PCI: Restrict pci transactions after pci suspend | expand

Message

Krishna Chaitanya Chundru July 6, 2022, 2:40 p.m. UTC 
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.


Krishna chaitanya chundru (2):
  PCI: qcom: Add system PM support
  PCI: qcom: Restrict pci transactions after pci suspend

 drivers/pci/controller/dwc/pcie-designware-host.c |  14 ++-
 drivers/pci/controller/dwc/pcie-qcom.c            | 121 +++++++++++++++++++++-
 2 files changed, 131 insertions(+), 4 deletions(-)