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[SCSI] qla4xxx: Take E-port out of reset before disabling pause frames

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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>
This commit is contained in:
Manish Dusane 2013-03-07 05:43:07 -05:00 committed by James Bottomley
parent 27db682bf0
commit c18b78ede5
2 changed files with 38 additions and 0 deletions
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28
drivers/scsi/qla4xxx/ql4_83xx.c
View file

@ -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);

10
drivers/scsi/qla4xxx/ql4_83xx.h
View file

@ -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