[SCSI] qla2xxx: Workaround D3 power-management issues.

Early ISP2432 parts have a known hardware issue when coming
out of a D3 hot state.  This issue can result in a hung PCIe
link.  Recent firmwares contain a workaround whereby the
stop-firmware mailbox command prevents the ISP from entering
the D3 hot state.

In order to ensure that the workaround succeeded the driver
must verify that the stop-firmware mailbox command completes
successfully.  In the event of a failure, the driver
attempts a shutdown-retry after resetting the ISP and
re-executing firmware.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>

3 files changed, 25 insertions, 3 deletions

diff --git a/drivers/scsi/qla2xxx/qla_gbl.h b/drivers/scsi/qla2xxx/qla_gbl.h
index b51ce8f59cb9..ca2f660a5438 100644
--- a/drivers/scsi/qla2xxx/qla_gbl.h
+++ b/drivers/scsi/qla2xxx/qla_gbl.h
@@ -48,6 +48,7 @@ extern void qla2x00_update_fcport(scsi_qla_host_t *, fc_port_t *);
 extern void qla2x00_reg_remote_port(scsi_qla_host_t *, fc_port_t *);
 
 extern void qla2x00_alloc_fw_dump(scsi_qla_host_t *);
+extern void qla2x00_try_to_stop_firmware(scsi_qla_host_t *);
 
 /*
  * Global Data in qla_os.c source file.
diff --git a/drivers/scsi/qla2xxx/qla_init.c b/drivers/scsi/qla2xxx/qla_init.c
index d5e0a124c4f4..08cb5e3fb553 100644
--- a/drivers/scsi/qla2xxx/qla_init.c
+++ b/drivers/scsi/qla2xxx/qla_init.c
@@ -3948,3 +3948,24 @@ qla24xx_load_risc(scsi_qla_host_t *ha, uint32_t *srisc_addr)
 fail_fw_integrity:
         return QLA_FUNCTION_FAILED;
 }
+
+void
+qla2x00_try_to_stop_firmware(scsi_qla_host_t *ha)
+{
+        int ret, retries;
+
+        if (!IS_QLA24XX(ha) && !IS_QLA54XX(ha))
+                return;
+
+        ret = qla2x00_stop_firmware(ha);
+        for (retries = 5; ret != QLA_SUCCESS && retries ; retries--) {
+                qla2x00_reset_chip(ha);
+                if (qla2x00_chip_diag(ha) != QLA_SUCCESS)
+                        continue;
+                if (qla2x00_setup_chip(ha) != QLA_SUCCESS)
+                        continue;
+                qla_printk(KERN_INFO, ha,
+                    "Attempting retry of stop-firmware command...\n");
+                ret = qla2x00_stop_firmware(ha);
+        }
+}
diff --git a/drivers/scsi/qla2xxx/qla_os.c b/drivers/scsi/qla2xxx/qla_os.c
index 34b6eb71e450..54f561d9c7a7 100644
--- a/drivers/scsi/qla2xxx/qla_os.c
+++ b/drivers/scsi/qla2xxx/qla_os.c
@@ -1712,8 +1712,10 @@ qla2x00_free_device(scsi_qla_host_t *ha)
         if (ha->eft)
                 qla2x00_trace_control(ha, TC_DISABLE, 0, 0);
 
+        ha->flags.online = 0;
+
         /* Stop currently executing firmware. */
-        qla2x00_stop_firmware(ha);
+        qla2x00_try_to_stop_firmware(ha);
 
         /* turn-off interrupts on the card */
         if (ha->interrupts_on)
@@ -1721,8 +1723,6 @@ qla2x00_free_device(scsi_qla_host_t *ha)
 
         qla2x00_mem_free(ha);
 
-        ha->flags.online = 0;
-
         /* Detach interrupts */
         if (ha->host->irq)
                 free_irq(ha->host->irq, ha);