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authorJiasen Lin <linjiasen@hygon.cn>2019-11-07 12:35:36 +0300
committerJon Mason <jdmason@kudzu.us>2020-03-13 03:41:25 +0300
commitbb81bf62151031df004864eabee0431c8b8e9064 (patch)
tree734a4d8728ef138c5bd759f0b8e39a3571106391 /drivers/ntb
parentbb6d3fb354c5ee8d6bde2d576eb7220ea09862b9 (diff)
downloadlinux-bb81bf62151031df004864eabee0431c8b8e9064.tar.xz
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.c4
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.h1
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