diff options
| author | Manish Dusane <manish.dusane@qlogic.com> | 2013-03-07 05:43:07 -0500 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-04-10 11:31:01 -0700 |
| commit | c18b78ede52d2ac8c664449bccaf36753a3c419b (patch) | |
| tree | f2a22030a404b1c95f0fc4db53e53c0f852837fa /drivers/scsi/qla4xxx/ql4_83xx.c | |
| parent | 27db682bf07fdc105af38827dbbd67d6f0a4ae04 (diff) | |
[SCSI] qla4xxx: Take E-port out of reset before disabling pause frames
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@qlogic.com>
Signed-off-by: Vikas Chaudhary <vikas.chaudhary@qlogic.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi/qla4xxx/ql4_83xx.c')
| -rw-r--r-- | drivers/scsi/qla4xxx/ql4_83xx.c | 28 |
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); |