[SCSI] qla2xxx: Wait for FLASH write-protection to complete after a write.

Some flash parts have a slow enable write-protection (WP)
operation whereby subsequent FLASH accesses would fail if the WP
operation had not completed.  Software now polls the SPI's
status-register for WP completion.

Signed-off-by: Andrew Vasquez <andrew.vasquez@qlogic.com>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>

1 files changed, 8 insertions, 2 deletions

diff --git a/drivers/scsi/qla2xxx/qla_sup.c b/drivers/scsi/qla2xxx/qla_sup.c
index ad2fa01bd233..af16c55b47a7 100644
--- a/drivers/scsi/qla2xxx/qla_sup.c
+++ b/drivers/scsi/qla2xxx/qla_sup.c
@@ -550,7 +550,7 @@ qla24xx_write_flash_data(scsi_qla_host_t *ha, uint32_t *dwptr, uint32_t faddr,
         int ret;
         uint32_t liter, miter;
         uint32_t sec_mask, rest_addr, conf_addr;
-        uint32_t fdata, findex ;
+        uint32_t fdata, findex, cnt;
         uint8_t man_id, flash_id;
         struct device_reg_24xx __iomem *reg = &ha->iobase->isp24;
         dma_addr_t optrom_dma;
@@ -690,8 +690,14 @@ qla24xx_write_flash_data(scsi_qla_host_t *ha, uint32_t *dwptr, uint32_t faddr,
                             0xff0000) | ((fdata >> 16) & 0xff));
         }
 
-        /* Enable flash write-protection. */
+        /* Enable flash write-protection and wait for completion. */
         qla24xx_write_flash_dword(ha, flash_conf_to_access_addr(0x101), 0x9c);
+        for (cnt = 300; cnt &&
+            qla24xx_read_flash_dword(ha,
+                    flash_conf_to_access_addr(0x005)) & BIT_0;
+            cnt--) {
+                udelay(10);
+        }
 
         /* Disable flash write. */
         WRT_REG_DWORD(&reg->ctrl_status,