From: Manish Dusane <manish.dusane@xxxxxxxxxx>
Problem Description:
Disabling pause frames might cause hardware wedging needing a power cycle.
This might happen if the Eport is not initialized and is in reset.
Solution:
Before disabling pause frames ensure that eport is out of reset.
Signed-off-by: Manish Dusane <manish.dusane@xxxxxxxxxx>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@xxxxxxxxxx>
---
drivers/scsi/qla4xxx/ql4_83xx.c | 28 ++++++++++++++++++++++++++++
drivers/scsi/qla4xxx/ql4_83xx.h | 10 ++++++++++
2 files changed, 38 insertions(+)
diff --git a/drivers/scsi/qla4xxx/ql4_83xx.c b/drivers/scsi/qla4xxx/ql4_83xx.c
index 5d8fe4f..d607eb8 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);
diff --git a/drivers/scsi/qla4xxx/ql4_83xx.h b/drivers/scsi/qla4xxx/ql4_83xx.h
index 6a00f90..fab237f 100644
--- a/drivers/scsi/qla4xxx/ql4_83xx.h
+++ b/drivers/scsi/qla4xxx/ql4_83xx.h
@@ -55,6 +55,16 @@
#define QLA83XX_SET_PAUSE_VAL 0x0
#define QLA83XX_SET_TC_MAX_CELL_VAL 0x03FF03FF
+#define QLA83XX_RESET_CONTROL 0x28084E50
+#define QLA83XX_RESET_REG 0x28084E60
+#define QLA83XX_RESET_PORT0 0x28084E70
+#define QLA83XX_RESET_PORT1 0x28084E80
+#define QLA83XX_RESET_PORT2 0x28084E90
+#define QLA83XX_RESET_PORT3 0x28084EA0
+#define QLA83XX_RESET_SRE_SHIM 0x28084EB0
+#define QLA83XX_RESET_EPG_SHIM 0x28084EC0
+#define QLA83XX_RESET_ETHER_PCS 0x28084ED0
+
/* qla_83xx_reg_tbl registers */
#define QLA83XX_PEG_HALT_STATUS1 0x34A8
#define QLA83XX_PEG_HALT_STATUS2 0x34AC
--
1.8.0
--
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