[PATCH 6.19 250/844] PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if link is not up

[Sasha Levin]

From: Manivannan Sadhasivam <manivannan.sadhasivam@xxxxxxxxxxxxxxxx>

[ 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@xxxxxxxxxxxxxxxx>
Signed-off-by: Manivannan Sadhasivam <mani@xxxxxxxxxx>
Tested-by: Vincent Guittot <vincent.guittot@xxxxxxxxxx>
Reviewed-by: Frank Li <Frank.Li@xxxxxxx>
Reviewed-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx>
Link: https://patch.msgid.link/20251218-pci-dwc-suspend-rework-v2-1-5a7778c6094a@xxxxxxxxxxxxxxxx
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
 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 372207c33a857..250725ced9026 100644
--- a/drivers/pci/controller/dwc/pcie-designware-host.c
+++ b/drivers/pci/controller/dwc/pcie-designware-host.c
@@ -1158,8 +1158,11 @@ 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
@@ -1194,6 +1197,7 @@ 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