Refer to PCIe r6.0, sec 5.2, fig 5-1 Link Power Management State Flow
Diagram. Both L0 and L2/L3 Ready 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, whatever the LTSSM state is in L2 or L3 after
a recommended 10ms max wait refer to PCIe r6.0, sec 5.3.3.2.1 PME
Synchronization.
The LTSSM states of i.MX6QP PCIe are inaccessible after the PME_Turn_Off
is kicked off. To handle this case, don't poll L2 state and add one max
10ms delay if QUIRK_NOL2POLL_IN_PM flag is existing in suspend.
Signed-off-by: Richard Zhu <hongxing.zhu@xxxxxxx>
Reviewed-by: Frank Li <Frank.Li@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 80e48746bbaf6..18b97bd0462bb 100644
--- a/drivers/pci/controller/dwc/pci-imx6.c
+++ b/drivers/pci/controller/dwc/pci-imx6.c
@@ -125,6 +125,7 @@ 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;
@@ -1765,6 +1766,7 @@ 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);
@@ -1849,6 +1851,7 @@ 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
