diff options
| author | Ching Huang <ching2048@areca.com.tw> | 2014-08-19 11:07:35 +0400 |
|---|---|---|
| committer | Christoph Hellwig <hch@lst.de> | 2014-09-16 20:39:49 +0400 |
| commit | 5eb6bfa02a9dfecbb1f644a0b13b16cd3d23770b (patch) | |
| tree | 3516dad932f67cab22915afa074abe9519025ae4 /drivers | |
| parent | a2c89bbccac476d42a8526c0c59d081d9e56d0a8 (diff) | |
| download | linux-5eb6bfa02a9dfecbb1f644a0b13b16cd3d23770b.tar.xz | |
arcmsr: clear outbound doorbell buffer completely
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/scsi/arcmsr/arcmsr_hba.c | 18 |
1 files changed, 14 insertions, 4 deletions
diff --git a/drivers/scsi/arcmsr/arcmsr_hba.c b/drivers/scsi/arcmsr/arcmsr_hba.c index 0707677c11a1..3363c31bb789 100644 --- a/drivers/scsi/arcmsr/arcmsr_hba.c +++ b/drivers/scsi/arcmsr/arcmsr_hba.c @@ -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(®->outbound_doorbell); writel(outbound_doorbell, ®->outbound_doorbell_clear); writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, ®->inbound_doorbell); + for (i = 0; i < 200; i++) { + msleep(20); + outbound_doorbell = readl(®->outbound_doorbell); + if (outbound_doorbell & + ARCMSR_HBCMU_IOP2DRV_DATA_WRITE_OK) { + writel(outbound_doorbell, + ®->outbound_doorbell_clear); + writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, + ®->inbound_doorbell); + } else + break; + } } } } @@ -3102,9 +3114,7 @@ sleep: arcmsr_get_firmware_spec(acb); arcmsr_start_adapter_bgrb(acb); /* clear Qbuffer if door bell ringed */ - outbound_doorbell = readl(®->outbound_doorbell); - writel(outbound_doorbell, ®->outbound_doorbell_clear); /*clear interrupt */ - writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, ®->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); |