PCI: dwc: Add L1 Substates context to ltssm_status of debugfs

DWC core couldn't distinguish LTSSM state among L1.0, L1.1 and L1.2. But
the vendor glue driver may implement additional logic to convey this
information. So add two pseudo definitions for vendor glue drivers to
translate their internal L1 Substates for debugfs to show.

Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Manivannan Sadhasivam <mani@kernel.org>
Link: https://patch.msgid.link/1765503205-22184-1-git-send-email-shawn.lin@rock-chips.com

diff --git a/drivers/pci/controller/dwc/pcie-designware-debugfs.c b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
index 0fbf86c0b97e0cf5fba7253df522ad2a765d292b..df98fee69892bbd48103bc1f38add57b94c128a2 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware-debugfs.c
+++ b/drivers/pci/controller/dwc/pcie-designware-debugfs.c
@@ -485,6 +485,8 @@ static const char *ltssm_status_string(enum dw_pcie_ltssm ltssm)
        DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ1);
        DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ2);
        DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_RCVRY_EQ3);
+       DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L1_1);
+       DW_PCIE_LTSSM_NAME(DW_PCIE_LTSSM_L1_2);
        default:
                str = "DW_PCIE_LTSSM_UNKNOWN";
                break;

diff --git a/drivers/pci/controller/dwc/pcie-designware.h b/drivers/pci/controller/dwc/pcie-designware.h
index aec4af5194b516c2e994e80b61ee233968125c88..fc9cf8ce86290c42ef480582754b9483c5cd5268 100644 (file)
--- a/drivers/pci/controller/dwc/pcie-designware.h
+++ b/drivers/pci/controller/dwc/pcie-designware.h
@@ -388,6 +388,10 @@ enum dw_pcie_ltssm {
        DW_PCIE_LTSSM_RCVRY_EQ2 = 0x22,
        DW_PCIE_LTSSM_RCVRY_EQ3 = 0x23,
 
+       /* Vendor glue drivers provide pseudo L1 substates from get_ltssm() */
+       DW_PCIE_LTSSM_L1_1 = 0x141,
+       DW_PCIE_LTSSM_L1_2 = 0x142,
+
        DW_PCIE_LTSSM_UNKNOWN = 0xFFFFFFFF,
 };