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PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if link is not up

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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
This commit is contained in:
Manivannan Sadhasivam
2025-12-18 17:34:52 +05:30
committed by Manivannan Sadhasivam
parent f994bb8f1c
commit cfd2fdfd0a
1 changed files with 5 additions and 1 deletions
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drivers/pci/controller/dwc/pcie-designware-host.c
+5 -1
View File
@@ -1169,8 +1169,11 @@ 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
@@ -1205,6 +1208,7 @@ 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);