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authorArindam Nath <arindam.nath@amd.com>2020-02-05 18:54:22 +0300
committerJon Mason <jdmason@kudzu.us>2020-03-13 17:04:19 +0300
commit5cafa48502c833fa175d2d16a26d1b4e0702aa74 (patch)
tree36b43477c287bd7fd19f76bff3b8fa481812114b /drivers/ntb
parent5c6404d5fa74124c64661ce44d7e447f3bf3df1e (diff)
downloadlinux-5cafa48502c833fa175d2d16a26d1b4e0702aa74.tar.xz
NTB: return the side info status from amd_poll_link
Bit 1 of SIDE_INFO register is an indication that the driver on the other side of link is ready. We set this bit during driver initialization sequence. So rather than having separate macros to return the status, we can simply return the status of this bit from amd_poll_link(). So a return of 1 or 0 from this function will indicate to the caller whether the driver on the other side of link is ready or not, respectively. Signed-off-by: Arindam Nath <arindam.nath@amd.com> Signed-off-by: Jon Mason <jdmason@kudzu.us>
Diffstat (limited to 'drivers/ntb')
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.c11
-rw-r--r--drivers/ntb/hw/amd/ntb_hw_amd.h2
2 files changed, 5 insertions, 8 deletions
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.c b/drivers/ntb/hw/amd/ntb_hw_amd.c
index f50537e0917b..84723420d70b 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.c
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.c
@@ -246,7 +246,7 @@ static int amd_ntb_get_link_status(struct amd_ntb_dev *ndev)
static int amd_link_is_up(struct amd_ntb_dev *ndev)
{
if (!ndev->peer_sta)
- return NTB_LNK_STA_ACTIVE(ndev->cntl_sta);
+ return ndev->cntl_sta;
if (ndev->peer_sta & AMD_LINK_UP_EVENT) {
ndev->peer_sta = 0;
@@ -896,16 +896,15 @@ static int amd_poll_link(struct amd_ntb_dev *ndev)
u32 reg;
reg = readl(mmio + AMD_SIDEINFO_OFFSET);
- reg &= NTB_LIN_STA_ACTIVE_BIT;
+ reg &= AMD_SIDE_READY;
dev_dbg(&ndev->ntb.pdev->dev, "%s: reg_val = 0x%x.\n", __func__, reg);
- if (reg == ndev->cntl_sta)
- return 0;
-
ndev->cntl_sta = reg;
- return amd_ntb_get_link_status(ndev);
+ amd_ntb_get_link_status(ndev);
+
+ return ndev->cntl_sta;
}
static void amd_link_hb(struct work_struct *work)
diff --git a/drivers/ntb/hw/amd/ntb_hw_amd.h b/drivers/ntb/hw/amd/ntb_hw_amd.h
index 39e5d18e12ff..156a4a92b803 100644
--- a/drivers/ntb/hw/amd/ntb_hw_amd.h
+++ b/drivers/ntb/hw/amd/ntb_hw_amd.h
@@ -53,10 +53,8 @@
#include <linux/pci.h>
#define AMD_LINK_HB_TIMEOUT msecs_to_jiffies(1000)
-#define NTB_LIN_STA_ACTIVE_BIT 0x00000002
#define NTB_LNK_STA_SPEED_MASK 0x000F0000
#define NTB_LNK_STA_WIDTH_MASK 0x03F00000
-#define NTB_LNK_STA_ACTIVE(x) (!!((x) & NTB_LIN_STA_ACTIVE_BIT))
#define NTB_LNK_STA_SPEED(x) (((x) & NTB_LNK_STA_SPEED_MASK) >> 16)
#define NTB_LNK_STA_WIDTH(x) (((x) & NTB_LNK_STA_WIDTH_MASK) >> 20)