[PATCH v1.2 10/16] arcmsr: clear outbound doorbell buffer completely

From: ching
Date: Wed May 14 2014 - 07:33:58 EST


From: Ching<ching2048@xxxxxxxxxxxx>

Clearing outbound doorbell buffer completely for adapter type C.
This is to prevent getting garbage data input from IOP before ioctl command beginning.

Signed-off-by: Ching<ching2048@xxxxxxxxxxxx>
---

diff -uprN a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c
--- a/drivers/scsi/arcmsr/arcmsr_hba.c 2014-05-07 18:47:20.000000000 +0800
+++ b/drivers/scsi/arcmsr/arcmsr_hba.c 2014-05-07 18:48:04.000000000 +0800
@@ -2892,11 +2892,23 @@ static void arcmsr_clear_doorbell_queue_
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;
+ }
}
}
}
@@ -3124,9 +3136,7 @@ sleep:
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);


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