[PATCH v3 0/2] PCI: qcom: Implement shutdown() to avoid SMMU/NoC errors on reboot

[Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>]

During system shutdown/reboot, power/clocks to the PCIe controller get
removed regardless of link state. If the link is still up when that
happens, it can trigger SMMU or NoC errors.

This series adds a shutdown() callback to the Qualcomm PCIe host driver
that forces the link into L2/D3cold before shutdown proceeds, reusing
the existing suspend_noirq() path.

Patch 1 makes dw_pcie_suspend_noirq() skip the D3cold capability check
during shutdown/reboot, since that check can fail and leave the link up
if any endpoint hasn't suspended yet.

Patch 2 adds qcom_pcie_shutdown() and wires it up as .shutdown.

Signed-off-by: Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>
---
Changes in v3:
- Added null point check and use pm_runtime_put_sync (Sashiko).
- Link to v2: https://patch.msgid.link/20260822-shutdown-v2-0-520a68f1b4a5@oss.qualcomm.com

Changes in v2:
1) don't remove the endpoint pci dev's only keep link in D3cold.
Link to v1: https://lore.kernel.org/all/20250401-shutdown-v1-1-f699859403ae@oss.qualcomm.com/

---
Krishna Chaitanya Chundru (1):
      PCI: dwc: Force L2 link entry on shutdown/reboot without D3cold check

Manivannan Sadhasivam (1):
      PCI: qcom: Implement shutdown() callback

 drivers/pci/controller/dwc/pcie-designware-host.c | 18 ++++++++++++++++--
 drivers/pci/controller/dwc/pcie-qcom.c            | 12 ++++++++++++
 2 files changed, 28 insertions(+), 2 deletions(-)
---
base-commit: c1366b72ad4e87be60b57b74635a3a0bc58d2b0b
change-id: 20260822-shutdown-fe8139dff2b7

Best regards,
--  
Krishna Chaitanya Chundru <krishna.chundru@oss.qualcomm.com>