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[SCSI] qla2xxx: Correct additional posting issues during NVRAM accesses. 

On MMIO relaxed-order platforms, it is possible for the
proper delay during NVRAM access to begin before the request
passes through the PCI bus (via a MMIO write) to the ISP.
Thus, causing a subsequent read to the NVRAM part to fail.
Add a MMIO read, after the MMIO write to insure any posted
writes are flushed.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@SteelEye.com>
This commit is contained in:
Andrew Vasquez 2005-11-08 14:37:06 -08:00 committed by James Bottomley
parent 07ce5eba85
commit dcb36ce9d9
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/qla2xxx/qla_sup.c
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@ -126,6 +126,7 @@ qla2x00_write_nvram_word(scsi_qla_host_t *ha, uint32_t addr, uint16_t data)
/* Wait for NVRAM to become ready */
WRT_REG_WORD(&reg->nvram, NVR_SELECT);
RD_REG_WORD(&reg->nvram); /* PCI Posting. */
do {
NVRAM_DELAY();
word = RD_REG_WORD(&reg->nvram);
@ -178,6 +179,7 @@ qla2x00_write_nvram_word_tmo(scsi_qla_host_t *ha, uint32_t addr, uint16_t data,
/* Wait for NVRAM to become ready */
WRT_REG_WORD(&reg->nvram, NVR_SELECT);
RD_REG_WORD(&reg->nvram); /* PCI Posting. */
do {
NVRAM_DELAY();
word = RD_REG_WORD(&reg->nvram);
@ -235,6 +237,7 @@ qla2x00_nvram_request(scsi_qla_host_t *ha, uint32_t nv_cmd)
/* Read data from NVRAM. */
for (cnt = 0; cnt < 16; cnt++) {
WRT_REG_WORD(&reg->nvram, NVR_SELECT | NVR_CLOCK);
RD_REG_WORD(&reg->nvram); /* PCI Posting. */
NVRAM_DELAY();
data <<= 1;
reg_data = RD_REG_WORD(&reg->nvram);
@ -337,6 +340,7 @@ qla2x00_clear_nvram_protection(scsi_qla_host_t *ha)
/* Wait for NVRAM to become ready. */
WRT_REG_WORD(&reg->nvram, NVR_SELECT);
RD_REG_WORD(&reg->nvram); /* PCI Posting. */
do {
NVRAM_DELAY();
word = RD_REG_WORD(&reg->nvram);
@ -388,6 +392,7 @@ qla2x00_set_nvram_protection(scsi_qla_host_t *ha, int stat)
/* Wait for NVRAM to become ready. */
WRT_REG_WORD(&reg->nvram, NVR_SELECT);
RD_REG_WORD(&reg->nvram); /* PCI Posting. */
do {
NVRAM_DELAY();
word = RD_REG_WORD(&reg->nvram);