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Diffstat (limited to 'drivers/scsi/qla4xxx/ql4_83xx.c')
-rw-r--r--drivers/scsi/qla4xxx/ql4_83xx.c28
1 files changed, 28 insertions, 0 deletions
diff --git a/drivers/scsi/qla4xxx/ql4_83xx.c b/drivers/scsi/qla4xxx/ql4_83xx.c
index 5d8fe4f75650..d607eb8e24cb 100644
--- a/drivers/scsi/qla4xxx/ql4_83xx.c
+++ b/drivers/scsi/qla4xxx/ql4_83xx.c
@@ -1629,9 +1629,37 @@ static void __qla4_83xx_disable_pause(struct scsi_qla_host *ha)
ql4_printk(KERN_INFO, ha, "Disabled pause frames successfully.\n");
}
+/**
+ * qla4_83xx_eport_init - Initialize EPort.
+ * @ha: Pointer to host adapter structure.
+ *
+ * If EPort hardware is in reset state before disabling pause, there would be
+ * serious hardware wedging issues. To prevent this perform eport init everytime
+ * before disabling pause frames.
+ **/
+static void qla4_83xx_eport_init(struct scsi_qla_host *ha)
+{
+ /* Clear the 8 registers */
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_REG, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_PORT0, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_PORT1, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_PORT2, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_PORT3, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_SRE_SHIM, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_EPG_SHIM, 0x0);
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_ETHER_PCS, 0x0);
+
+ /* Write any value to Reset Control register */
+ qla4_83xx_wr_reg_indirect(ha, QLA83XX_RESET_CONTROL, 0xFF);
+
+ ql4_printk(KERN_INFO, ha, "EPORT is out of reset.\n");
+}
+
void qla4_83xx_disable_pause(struct scsi_qla_host *ha)
{
ha->isp_ops->idc_lock(ha);
+ /* Before disabling pause frames, ensure that eport is not in reset */
+ qla4_83xx_eport_init(ha);
qla4_83xx_dump_pause_control_regs(ha);
__qla4_83xx_disable_pause(ha);
ha->isp_ops->idc_unlock(ha);