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| author |   Jiasen Lin <linjiasen@hygon.cn> | 2019-11-07 01:35:36 -0800 |
|---|---|---|
| committer |   Jon Mason <jdmason@kudzu.us> | 2020-03-12 20:41:25 -0400 |
| commit | bb81bf62151031df004864eabee0431c8b8e9064 (patch) | |
| tree | 734a4d8728ef138c5bd759f0b8e39a3571106391 /drivers/ntb | |
| parent | Linux 5.6-rc1 (diff) | |
| download | wireguard-linux-bb81bf62151031df004864eabee0431c8b8e9064.tar.xz wireguard-linux-bb81bf62151031df004864eabee0431c8b8e9064.zip | |
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 <linjiasen@hygon.cn>
Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb')
| -rw-r--r-- | drivers/ntb/hw/amd/ntb_hw_amd.c | 4 | ||||
| -rw-r--r-- | 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 <linux/pci.h> #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 |