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

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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
This commit is contained in:
Shawn Lin 2025-12-12 09:33:24 +08:00 committed by Manivannan Sadhasivam
parent 6a13949909
commit 679ec639f2
2 changed files with 6 additions and 0 deletions
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2
drivers/pci/controller/dwc/pcie-designware-debugfs.c
View File

@ -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;

4
drivers/pci/controller/dwc/pcie-designware.h
View File

@ -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,
};