[PATCH 6.18 213/752] PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if link is not up

Sasha Levin
2026-02-28T17:51:09Z

From: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>

[ Upstream commit cfd2fdfd0a8da2e5bbfdc4009b9c4b8bf164c937 ]

During system suspend, if the PCIe link is not up, then there is no need
to broadcast PME_Turn_Off message and wait for L2/L3 transition. So skip
them.

Signed-off-by: Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Tested-by: Vincent Guittot <vincent.guittot@linaro.org>
Reviewed-by: Frank Li <Frank.Li@nxp.com>
Reviewed-by: Shawn Lin <shawn.lin@rock-chips.com>
Link: https://patch.msgid.link/20251218-pci-dwc-suspend-rework-v2-1-5a7778c6094a@oss.qualcomm.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
drivers/pci/controller/dwc/pcie-designware-host.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c
index e92513c5bda51..702885c53f467 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -1146,8 +1146,11 @@ static int dw_pcie_pme_turn_off(struct dw_pcie *pci)
int dw_pcie_suspend_noirq(struct dw_pcie *pci)
{
u8 offset = dw_pcie_find_capability(pci, PCI_CAP_ID_EXP);
+ int ret = 0;
u32 val;
- int ret;
+
+ if (!dw_pcie_link_up(pci))
+ goto stop_link;

/*
* If L1SS is supported, then do not put the link into L2 as some
@@ -1182,6 +1185,7 @@ int dw_pcie_suspend_noirq(struct dw_pcie *pci)
*/
udelay(1);

+stop_link:
dw_pcie_stop_link(pci);
if (pci->pp.ops->deinit)
pci->pp.ops->deinit(&pci->pp);
--
2.51.0