A chip freeze is observed on i.MX7D when PCIe RC kicks off the PM_PME
message and no any devices are connected on the port.
To workaroud such kind of issue, skip PME_Turn_Off message if there is
no endpoint connected.
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 15 +++++++++------
1 file changed, 9 insertions(+), 6 deletions(-)
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index 85740400a8d0d..fb5639c73e29f 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -1009,12 +1009,15 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
u32 val;
int ret;
- if (pci->pp.ops->pme_turn_off) {
- pci->pp.ops->pme_turn_off(&pci->pp);
- } else {
- ret = dw_pcie_pme_turn_off(pci);
- if (ret)
- return ret;
+ /* Skip PME_Turn_Off message if there is no endpoint connected */
+ if (dw_pcie_get_ltssm(pci) > DW_PCIE_LTSSM_DETECT_WAIT) {
+ if (pci->pp.ops->pme_turn_off) {
+ pci->pp.ops->pme_turn_off(&pci->pp);
+ } else {
+ ret = dw_pcie_pme_turn_off(pci);
+ if (ret)
+ return ret;
+ }
}
if (dwc_quirk(pci, QUIRK_NOL2POLL_IN_PM)) {
--
2.37.1
