diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.c b/drivers/infiniband/hw/mthca/mthca_cmd.c
index e15c1e2deab4b13e2f046176876a4fb4b2fdcdd5..c258c1b7022e37af90b2fc06638ea889b0705949 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.c
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.c
@@ -1282,10 +1282,8 @@ int mthca_INIT_IB(struct mthca_dev *dev,
 #define INIT_IB_FLAG_SIG         (1 << 18)
 #define INIT_IB_FLAG_NG          (1 << 17)
 #define INIT_IB_FLAG_G0          (1 << 16)
-#define INIT_IB_FLAG_1X          (1 << 8)
-#define INIT_IB_FLAG_4X          (1 << 9)
-#define INIT_IB_FLAG_12X         (1 << 11)
 #define INIT_IB_VL_SHIFT         4
+#define INIT_IB_PORT_WIDTH_SHIFT 8
 #define INIT_IB_MTU_SHIFT        12
 #define INIT_IB_MAX_GID_OFFSET   0x06
 #define INIT_IB_MAX_PKEY_OFFSET  0x0a
@@ -1301,12 +1299,11 @@ int mthca_INIT_IB(struct mthca_dev *dev,
 	memset(inbox, 0, INIT_IB_IN_SIZE);
 
 	flags = 0;
-	flags |= param->enable_1x     ? INIT_IB_FLAG_1X  : 0;
-	flags |= param->enable_4x     ? INIT_IB_FLAG_4X  : 0;
 	flags |= param->set_guid0     ? INIT_IB_FLAG_G0  : 0;
 	flags |= param->set_node_guid ? INIT_IB_FLAG_NG  : 0;
 	flags |= param->set_si_guid   ? INIT_IB_FLAG_SIG : 0;
 	flags |= param->vl_cap << INIT_IB_VL_SHIFT;
+	flags |= param->port_width << INIT_IB_PORT_WIDTH_SHIFT;
 	flags |= param->mtu_cap << INIT_IB_MTU_SHIFT;
 	MTHCA_PUT(inbox, flags, INIT_IB_FLAGS_OFFSET);
 
diff --git a/drivers/infiniband/hw/mthca/mthca_cmd.h b/drivers/infiniband/hw/mthca/mthca_cmd.h
index 4e0062778ff9c4a8b58ee9f3554d352dfd36ef79..11f02a61432af026238c59cce0542e9d9aee7855 100644
--- a/drivers/infiniband/hw/mthca/mthca_cmd.h
+++ b/drivers/infiniband/hw/mthca/mthca_cmd.h
@@ -220,8 +220,7 @@ struct mthca_init_hca_param {
 };
 
 struct mthca_init_ib_param {
-	int enable_1x;
-	int enable_4x;
+	int port_width;
 	int vl_cap;
 	int mtu_cap;
 	u16 gid_cap;
diff --git a/drivers/infiniband/hw/mthca/mthca_dev.h b/drivers/infiniband/hw/mthca/mthca_dev.h
index c8f67c03418313a23ecaf645e8b49f88d1e6759f..0f90a173ecee01a029ec4a6f9f9334ffff19d91a 100644
--- a/drivers/infiniband/hw/mthca/mthca_dev.h
+++ b/drivers/infiniband/hw/mthca/mthca_dev.h
@@ -148,6 +148,7 @@ struct mthca_limits {
 	int      reserved_mcgs;
 	int      num_pds;
 	int      reserved_pds;
+	u8       port_width_cap;
 };
 
 struct mthca_alloc {
diff --git a/drivers/infiniband/hw/mthca/mthca_main.c b/drivers/infiniband/hw/mthca/mthca_main.c
index 279f158aa12b9f65403622bf394063394035b6f2..16c5d4a805f0a367f9414517faa42f04f6d9f8e2 100644
--- a/drivers/infiniband/hw/mthca/mthca_main.c
+++ b/drivers/infiniband/hw/mthca/mthca_main.c
@@ -171,6 +171,7 @@ static int __devinit mthca_dev_lim(struct mthca_dev *mdev, struct mthca_dev_lim
 	mdev->limits.reserved_mrws      = dev_lim->reserved_mrws;
 	mdev->limits.reserved_uars      = dev_lim->reserved_uars;
 	mdev->limits.reserved_pds       = dev_lim->reserved_pds;
+	mdev->limits.port_width_cap     = dev_lim->max_port_width;
 
 	/* IB_DEVICE_RESIZE_MAX_WR not supported by driver.
 	   May be doable since hardware supports it for SRQ.
diff --git a/drivers/infiniband/hw/mthca/mthca_qp.c b/drivers/infiniband/hw/mthca/mthca_qp.c
index 8fbb4f1f5398b7c5fd277a9884cc5d7a1ed3e298..b7e3d2342799086174de85a1d8ab3f44f4248456 100644
--- a/drivers/infiniband/hw/mthca/mthca_qp.c
+++ b/drivers/infiniband/hw/mthca/mthca_qp.c
@@ -575,12 +575,11 @@ static void init_port(struct mthca_dev *dev, int port)
 
 	memset(&param, 0, sizeof param);
 
-	param.enable_1x = 1;
-	param.enable_4x = 1;
-	param.vl_cap    = dev->limits.vl_cap;
-	param.mtu_cap   = dev->limits.mtu_cap;
-	param.gid_cap   = dev->limits.gid_table_len;
-	param.pkey_cap  = dev->limits.pkey_table_len;
+	param.port_width = dev->limits.port_width_cap;
+	param.vl_cap     = dev->limits.vl_cap;
+	param.mtu_cap    = dev->limits.mtu_cap;
+	param.gid_cap    = dev->limits.gid_table_len;
+	param.pkey_cap   = dev->limits.pkey_table_len;
 
 	err = mthca_INIT_IB(dev, &param, port, &status);
 	if (err)