RDMA/qedr: Fix doorbell setting

Change the doorbell setting so that the maximum value between the last and
current value is set. This is to avoid doorbells being lost.

Fixes: a7efd777 ("qedr: Add support for PD,PKEY and CQ verbs")
Link: https://lore.kernel.org/r/20200902165741.8355-3-michal.kalderon@marvell.comSigned-off-by: Michal Kalderon <michal.kalderon@marvell.com>
Signed-off-by: Jason Gunthorpe <jgg@nvidia.com>

drivers/infiniband/hw/qedr/verbs.c

@@ -989,7 +989,7 @@ int qedr_create_cq(struct ib_cq *ibcq, const struct ib_cq_init_attr *attr,
 		/* Generate doorbell address. */
 		cq->db.data.icid = cq->icid;
 		cq->db_addr = dev->db_addr + db_offset;
-		cq->db.data.params = DB_AGG_CMD_SET <<
+		cq->db.data.params = DB_AGG_CMD_MAX <<
 		    RDMA_PWM_VAL32_DATA_AGG_CMD_SHIFT;
 
 		/* point to the very last element, passing it we will toggle */