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>

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)

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)