From bb81bf62151031df004864eabee0431c8b8e9064 Mon Sep 17 00:00:00 2001 From: Jiasen Lin Date: Thu, 7 Nov 2019 01:35:36 -0800 Subject: NTB: Fix an error in get link status The offset of PCIe Capability Header for AMD and HYGON NTB is 0x64, but the macro which named "AMD_LINK_STATUS_OFFSET" is defined as 0x68. It is offset of Device Capabilities Reg rather than Link Control Reg. This code trigger an error in get link statsus: cat /sys/kernel/debug/ntb_hw_amd/0000:43:00.1/info LNK STA - 0x8fa1 Link Status - Up Link Speed - PCI-E Gen 0 Link Width - x0 This patch use pcie_capability_read_dword to get link status. After fix this issue, we can get link status accurately: cat /sys/kernel/debug/ntb_hw_amd/0000:43:00.1/info LNK STA - 0x11030042 Link Status - Up Link Speed - PCI-E Gen 3 Link Width - x16 Fixes: a1b3695820aa4 ("NTB: Add support for AMD PCI-Express Non-Transparent Bridge") Signed-off-by: Jiasen Lin Signed-off-by: Jon Mason --- drivers/ntb/hw/amd/ntb_hw_amd.c | 4 ++-- drivers/ntb/hw/amd/ntb_hw_amd.h | 1 - 2 files changed, 2 insertions(+), 3 deletions(-) diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c index e52b300b2f5b..ae911053ba9c 100644 --- a/drivers/ntb/hw/amd/ntb_hw_amd.c +++ b/drivers/ntb/hw/amd/ntb_hw_amd.c @@ -855,8 +855,8 @@ static int amd_poll_link(struct amd_ntb_dev *ndev) ndev->cntl_sta = reg; - rc = pci_read_config_dword(ndev->ntb.pdev, - AMD_LINK_STATUS_OFFSET, &stat); + rc = pcie_capability_read_dword(ndev->ntb.pdev, + PCI_EXP_LNKCTL, &stat); if (rc) return 0; ndev->lnk_sta = stat; diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h index 139a307147bc..39e5d18e12ff 100644 --- a/drivers/ntb/hw/amd/ntb_hw_amd.h +++ b/drivers/ntb/hw/amd/ntb_hw_amd.h @@ -53,7 +53,6 @@ #include #define AMD_LINK_HB_TIMEOUT msecs_to_jiffies(1000) -#define AMD_LINK_STATUS_OFFSET 0x68 #define NTB_LIN_STA_ACTIVE_BIT 0x00000002 #define NTB_LNK_STA_SPEED_MASK 0x000F0000 #define NTB_LNK_STA_WIDTH_MASK 0x03F00000 -- cgit v1.2.3-59-g8ed1b