scsi: megaraid_sas: Reset adapter if FW is not in READY state after device resume

After device resume we expect the firmware to be in READY state.
Transition to READY might fail due to unhandled exceptions, such as an
internal error or a hardware failure. Retry initiating chip reset and wait
for the controller to come to ready state.

Link: https://lore.kernel.org/r/1579000882-20246-2-git-send-email-anand.lodnoor@broadcom.com
Signed-off-by: Chandrakanth Patil <chandrakanth.patil@broadcom.com>
Signed-off-by: Anand Lodnoor <anand.lodnoor@broadcom.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 29 insertions, 2 deletions

diff --git a/drivers/scsi/megaraid/megaraid_sas_base.c b/drivers/scsi/megaraid/megaraid_sas_base.c
index a4bc81479284..6a01a605508b 100644
--- a/drivers/scsi/megaraid/megaraid_sas_base.c
+++ b/drivers/scsi/megaraid/megaraid_sas_base.c
@@ -7593,6 +7593,7 @@ megasas_resume(struct pci_dev *pdev)
 	struct Scsi_Host *host;
 	struct megasas_instance *instance;
 	int irq_flags = PCI_IRQ_LEGACY;
+	u32 status_reg;
 
 	instance = pci_get_drvdata(pdev);
 
@@ -7620,9 +7621,35 @@ megasas_resume(struct pci_dev *pdev)
 	/*
 	 * We expect the FW state to be READY
 	 */
-	if (megasas_transition_to_ready(instance, 0))
-		goto fail_ready_state;
 
+	if (megasas_transition_to_ready(instance, 0)) {
+		dev_info(&instance->pdev->dev,
+			 "Failed to transition controller to ready from %s!\n",
+			 __func__);
+		if (instance->adapter_type != MFI_SERIES) {
+			status_reg =
+				instance->instancet->read_fw_status_reg(instance);
+			if (!(status_reg & MFI_RESET_ADAPTER) ||
+				((megasas_adp_reset_wait_for_ready
+				(instance, true, 0)) == FAILED))
+				goto fail_ready_state;
+		} else {
+			atomic_set(&instance->fw_reset_no_pci_access, 1);
+			instance->instancet->adp_reset
+				(instance, instance->reg_set);
+			atomic_set(&instance->fw_reset_no_pci_access, 0);
+
+			/* waiting for about 30 seconds before retry */
+			ssleep(30);
+
+			if (megasas_transition_to_ready(instance, 0))
+				goto fail_ready_state;
+		}
+
+		dev_info(&instance->pdev->dev,
+			 "FW restarted successfully from %s!\n",
+			 __func__);
+	}
 	if (megasas_set_dma_mask(instance))
 		goto fail_set_dma_mask;