diff options
| author | Manivannan Sadhasivam <manivannan.sadhasivam@oss.qualcomm.com> | 2025-12-18 15:04:52 +0300 |
|---|---|---|
| committer | Sasha Levin <sashal@kernel.org> | 2026-03-04 15:20:09 +0300 |
| commit | cf0e2c83136133f1aab3082d092e046fbc79991f (patch) | |
| tree | fa61e7bc1f36a998d5a91f28a4a7df3d6333d261 /drivers/pci/controller | |
| parent | fe136426e30ca6debcf916fd6a141555ed9fde74 (diff) | |
| download | linux-cf0e2c83136133f1aab3082d092e046fbc79991f.tar.xz | |
PCI: dwc: Skip PME_Turn_Off broadcast and L2/L3 transition during suspend if link is not up
[ 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>
Diffstat (limited to 'drivers/pci/controller')
| -rw-r--r-- | drivers/pci/controller/dwc/pcie-designware-host.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/pci/controller/dwc/pcie-designware-host.c b/drivers/pci/controller/dwc/pcie-designware-host.c index e92513c5bda5..702885c53f46 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); |