During suspend/resume, i.MX6QP PCIe is hang in L2 poll when one endpoint
device is connected, for example the Intel e1000e network card.
Refer to Figure5-1 Link Power Management State Flow Diagram of PCI
Express Base Spec Rev6.0. L0 can be transferred to LDn directly.
It's harmless to let dw_pcie_suspend_noirq() proceed suspend after the
PME_Turn_Off is sent out, whateve the ltssm state is in L2 or L3 on some
PME_Turn_Off handshake broken platforms.
To fix this issue, add one quirk to remove the L2 entry poll and let
dw_pcie_suspend_noirq() proceed directly after PME_Turn_Off is sent out.
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
---
drivers/pci/controller/dwc/pci-imx6.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/pci/controller/dwc/pci-imx6.c b/drivers/pci/controller/dwc/pci-imx6.c
index 5f267dd261b5..aade80010cbe 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -116,6 +116,7 @@ struct imx_pcie_drvdata {
enum imx_pcie_variants variant;
enum dw_pcie_device_mode mode;
u32 flags;
+ u32 quirk;
int dbi_length;
const char *gpr;
const u32 ltssm_off;
@@ -1614,6 +1615,7 @@ static int imx_pcie_probe(struct platform_device *pdev)
if (ret)
return ret;
+ pci->quirk_flag = imx_pcie->drvdata->quirk;
pci->use_parent_dt_ranges = true;
if (imx_pcie->drvdata->mode == DW_PCIE_EP_TYPE) {
ret = imx_add_pcie_ep(imx_pcie, pdev);
@@ -1692,6 +1694,7 @@ static const struct imx_pcie_drvdata drvdata[] = {
.enable_ref_clk = imx6q_pcie_enable_ref_clk,
.core_reset = imx6qp_pcie_core_reset,
.ops = &imx_pcie_host_ops,
+ .quirk = QUIRK_NOL2POLL_IN_PM,
},
[IMX7D] = {
.variant = IMX7D,
--
2.37.1
