isci: Fix use of SATA soft reset state machine.

The driver SATA LUN reset function incorrectly sent an SRST deassert
FIS, which is unnecessary because the core initiates the entire SATA
soft reset state machine from the assert request.
Signed-off-by: NJeff Skirvin <jeffrey.d.skirvin@intel.com>
Signed-off-by: NDan Williams <dan.j.williams@intel.com>

drivers/scsi/isci/sata.c

@@ -301,8 +301,8 @@ int isci_task_send_lu_reset_sata(
 	int ret = TMF_RESP_FUNC_FAILED;
 	unsigned long flags;
 
-	/* Send the initial SRST to the target */
-	#define ISCI_SRST_TIMEOUT_MS 20 /* 20 ms timeout. */
+	/* Send the soft reset to the target */
+	#define ISCI_SRST_TIMEOUT_MS 25000 /* 25 second timeout. */
 	isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_high,
 			    NULL, NULL
 			    );
@@ -319,38 +319,6 @@ int isci_task_send_lu_reset_sata(
 		/* Return the failure so that the LUN reset is escalated
 		 * to a target reset.
 		 */
-		goto out;
 	}
-
-	/* Leave SRST high for a bit. */
-	#define ISCI_SRST_ASSERT_DELAY 100 /* usecs */
-	udelay(ISCI_SRST_ASSERT_DELAY);
-
-	/* Deassert SRST. */
-	isci_task_build_tmf(&tmf, isci_device, isci_tmf_sata_srst_low,
-			    NULL, NULL
-			    );
-	ret = isci_task_execute_tmf(isci_host, &tmf, ISCI_SRST_TIMEOUT_MS);
-
-	if (ret == TMF_RESP_FUNC_COMPLETE)
-		dev_dbg(&isci_host->pdev->dev,
-			"%s: SATA LUN reset passed (%p)\n",
-			__func__,
-			isci_device);
-	else
-		dev_warn(&isci_host->pdev->dev,
-			 "%s: Deassert SRST failed (%p)=%x\n",
-			 __func__,
-			 isci_device,
-			 ret);
-
- out:
-	spin_lock_irqsave(&isci_host->scic_lock, flags);
-
-	/* Resume the device. */
-	scic_sds_remote_device_resume(to_sci_dev(isci_device));
-
-	spin_unlock_irqrestore(&isci_host->scic_lock, flags);
-
 	return ret;
 }