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arcmsr: clear outbound doorbell buffer completely

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Clear outbound doorbell buffer completely for adapter type C.  This is to
prevent getting bad data input from IOP before ioctl command processing
starts.

Signed-off-by: Ching Huang <ching2048@areca.com.tw>
Reviewed-by: Tomas Henzl <thenzl@redhat.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Ching Huang 2014-08-19 15:07:35 +08:00 committed by Christoph Hellwig
parent a2c89bbcca
commit 5eb6bfa02a
1 changed files with 14 additions and 4 deletions
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18
drivers/scsi/arcmsr/arcmsr_hba.c
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@ -2870,11 +2870,23 @@ static void arcmsr_clear_doorbell_queue_buffer(struct AdapterControlBlock *acb)
break;
case ACB_ADAPTER_TYPE_C: {
struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
uint32_t outbound_doorbell;
uint32_t outbound_doorbell, i;
/* empty doorbell Qbuffer if door bell ringed */
outbound_doorbell = readl(&reg->outbound_doorbell);
writel(outbound_doorbell, &reg->outbound_doorbell_clear);
writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);
for (i = 0; i < 200; i++) {
msleep(20);
outbound_doorbell = readl(&reg->outbound_doorbell);
if (outbound_doorbell &
ARCMSR_HBCMU_IOP2DRV_DATA_WRITE_OK) {
writel(outbound_doorbell,
&reg->outbound_doorbell_clear);
writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK,
&reg->inbound_doorbell);
} else
break;
}
}
}
}
@ -3102,9 +3114,7 @@ static int arcmsr_bus_reset(struct scsi_cmnd *cmd)
arcmsr_get_firmware_spec(acb);
arcmsr_start_adapter_bgrb(acb);
/* clear Qbuffer if door bell ringed */
outbound_doorbell = readl(&reg->outbound_doorbell);
writel(outbound_doorbell, &reg->outbound_doorbell_clear); /*clear interrupt */
writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, &reg->inbound_doorbell);
arcmsr_clear_doorbell_queue_buffer(acb);
/* enable outbound Post Queue,outbound doorbell Interrupt */
arcmsr_enable_outbound_ints(acb, intmask_org);
atomic_set(&acb->rq_map_token, 16);