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

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Message-ID: <1400067219.6957.41.camel@localhost>
Date:	Wed, 14 May 2014 19:33:39 +0800
From:	ching <ching2048@...ca.com.tw>
To:	jbottomley@...allels.com, dan.carpenter@...cle.com,
	thenzl@...hat.com, agordeev@...hat.com, linux-scsi@...r.kernel.org,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v1.2 10/16] arcmsr: clear outbound doorbell buffer
 completely

From: Ching<ching2048@...ca.com.tw>

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@...ca.com.tw>
---

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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