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>
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@ -2870,11 +2870,23 @@ static void arcmsr_clear_doorbell_queue_buffer(struct AdapterControlBlock *acb)
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break;
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case ACB_ADAPTER_TYPE_C: {
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struct MessageUnit_C *reg = (struct MessageUnit_C *)acb->pmuC;
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uint32_t outbound_doorbell;
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uint32_t outbound_doorbell, i;
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/* empty doorbell Qbuffer if door bell ringed */
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outbound_doorbell = readl(®->outbound_doorbell);
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writel(outbound_doorbell, ®->outbound_doorbell_clear);
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writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, ®->inbound_doorbell);
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for (i = 0; i < 200; i++) {
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msleep(20);
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outbound_doorbell = readl(®->outbound_doorbell);
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if (outbound_doorbell &
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ARCMSR_HBCMU_IOP2DRV_DATA_WRITE_OK) {
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writel(outbound_doorbell,
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®->outbound_doorbell_clear);
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writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK,
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®->inbound_doorbell);
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} else
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break;
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}
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}
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}
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}
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@ -3102,9 +3114,7 @@ sleep:
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arcmsr_get_firmware_spec(acb);
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arcmsr_start_adapter_bgrb(acb);
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/* clear Qbuffer if door bell ringed */
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outbound_doorbell = readl(®->outbound_doorbell);
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writel(outbound_doorbell, ®->outbound_doorbell_clear); /*clear interrupt */
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writel(ARCMSR_HBCMU_DRV2IOP_DATA_READ_OK, ®->inbound_doorbell);
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arcmsr_clear_doorbell_queue_buffer(acb);
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/* enable outbound Post Queue,outbound doorbell Interrupt */
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arcmsr_enable_outbound_ints(acb, intmask_org);
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atomic_set(&acb->rq_map_token, 16);
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