[PATCH] scsi: pm80xx: port reset timeout error handling correction.

[Ajish Koshy <Ajish.Koshy@microchip.com>]

Error handling steps were not in sequence as per the programmers
manual. Expected sequence:
 -PHY_DOWN (PORT_IN_RESET)
 -PORT_RESET_TIMER_TMO
 -Host aborts pending I/Os
 -Host deregister the device
 -Host sends HW_EVENT_PHY_DOWN ack

Earlier, we were sending HW_EVENT_PHY_DOWN ack first and then
deregister the device.

Signed-off-by: Ajish Koshy <Ajish.Koshy@microchip.com>
Signed-off-by: Viswas G <Viswas.G@microchip.com>
---
 drivers/scsi/pm8001/pm8001_sas.c | 7 ++++++-
 drivers/scsi/pm8001/pm8001_sas.h | 3 +++
 drivers/scsi/pm8001/pm80xx_hwi.c | 7 +++++--
 3 files changed, 14 insertions(+), 3 deletions(-)

diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
index c9a16eef38c1..160ee8b228c9 100644
--- a/drivers/scsi/pm8001/pm8001_sas.c
+++ b/drivers/scsi/pm8001/pm8001_sas.c
@@ -1199,7 +1199,7 @@ int pm8001_abort_task(struct sas_task *task)
 	struct pm8001_device *pm8001_dev;
 	struct pm8001_tmf_task tmf_task;
 	int rc = TMF_RESP_FUNC_FAILED, ret;
-	u32 phy_id;
+	u32 phy_id, port_id;
 	struct sas_task_slow slow_task;
 
 	if (unlikely(!task || !task->lldd_task || !task->dev))
@@ -1246,6 +1246,7 @@ int pm8001_abort_task(struct sas_task *task)
 			DECLARE_COMPLETION_ONSTACK(completion_reset);
 			DECLARE_COMPLETION_ONSTACK(completion);
 			struct pm8001_phy *phy = pm8001_ha->phy + phy_id;
+			port_id = phy->port->port_id;
 
 			/* 1. Set Device state as Recovery */
 			pm8001_dev->setds_completion = &completion;
@@ -1297,6 +1298,10 @@ int pm8001_abort_task(struct sas_task *task)
 						PORT_RESET_TMO);
 				if (phy->port_reset_status == PORT_RESET_TMO) {
 					pm8001_dev_gone_notify(dev);
+					PM8001_CHIP_DISP->hw_event_ack_req(
+						pm8001_ha, 0,
+						0x07, /*HW_EVENT_PHY_DOWN ack*/
+						port_id, phy_id, 0, 0);
 					goto out;
 				}
 			}
diff --git a/drivers/scsi/pm8001/pm8001_sas.h b/drivers/scsi/pm8001/pm8001_sas.h
index 83eec16d021d..a17da1cebce1 100644
--- a/drivers/scsi/pm8001/pm8001_sas.h
+++ b/drivers/scsi/pm8001/pm8001_sas.h
@@ -216,6 +216,9 @@ struct pm8001_dispatch {
 		u32 state);
 	int (*sas_re_init_req)(struct pm8001_hba_info *pm8001_ha);
 	int (*fatal_errors)(struct pm8001_hba_info *pm8001_ha);
+	void (*hw_event_ack_req)(struct pm8001_hba_info *pm8001_ha,
+		u32 Qnum, u32 SEA, u32 port_id, u32 phyId, u32 param0,
+		u32 param1);
 };
 
 struct pm8001_chip_info {
diff --git a/drivers/scsi/pm8001/pm80xx_hwi.c b/drivers/scsi/pm8001/pm80xx_hwi.c
index 0849ecc913c7..97750d0ebee9 100644
--- a/drivers/scsi/pm8001/pm80xx_hwi.c
+++ b/drivers/scsi/pm8001/pm80xx_hwi.c
@@ -3709,8 +3709,10 @@ static int mpi_hw_event(struct pm8001_hba_info *pm8001_ha, void *piomb)
 		break;
 	case HW_EVENT_PORT_RESET_TIMER_TMO:
 		pm8001_dbg(pm8001_ha, MSG, "HW_EVENT_PORT_RESET_TIMER_TMO\n");
-		pm80xx_hw_event_ack_req(pm8001_ha, 0, HW_EVENT_PHY_DOWN,
-			port_id, phy_id, 0, 0);
+		if (!pm8001_ha->phy[phy_id].reset_completion) {
+			pm80xx_hw_event_ack_req(pm8001_ha, 0, HW_EVENT_PHY_DOWN,
+				port_id, phy_id, 0, 0);
+		}
 		sas_phy_disconnected(sas_phy);
 		phy->phy_attached = 0;
 		sas_notify_port_event(sas_phy, PORTE_LINK_RESET_ERR,
@@ -5051,4 +5053,5 @@ const struct pm8001_dispatch pm8001_80xx_dispatch = {
 	.fw_flash_update_req	= pm8001_chip_fw_flash_update_req,
 	.set_dev_state_req	= pm8001_chip_set_dev_state_req,
 	.fatal_errors		= pm80xx_fatal_errors,
+	.hw_event_ack_req	= pm80xx_hw_event_ack_req,
 };
-- 
2.27.0