linux-kernel - [PATCH v2 03/23] ata: sata_dwc_460ex: set dma

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Message-Id: <1461661404-1952-4-git-send-email-andriy.shevchenko@linux.intel.com>
Date:	Tue, 26 Apr 2016 12:03:04 +0300
From:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:	Tejun Heo <tj@...nel.org>, linux-ide@...r.kernel.org,
	Rob Herring <robh+dt@...nel.org>,
	linuxppc-dev@...ts.ozlabs.org, linux-kernel@...r.kernel.org,
	Christian Lamparter <chunkeey@...glemail.com>,
	Måns Rullgård <mans@...sr.com>,
	Julian Margetson <runaway@...dw.ms>
Cc:	Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
Subject: [PATCH v2 03/23] ata: sata_dwc_460ex: set dma_boundary to 0x1fff

The original code states:

	Make sure a LLI block is not created that will span 8K max FIS
	boundary. If the block spans such a FIS boundary, there is a chance
	that a DMA burst will cross that boundary -- this results in an error
	in the host controller.

Since we have switched to generic DMAengine API we satisfy above by setting
dma_boundary value to 0x1fff.

Suggested-by: Mans Rullgard <mans@...sr.com>
Tested-by: Christian Lamparter <chunkeey@...glemail.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
---
 drivers/ata/sata_dwc_460ex.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/ata/sata_dwc_460ex.c b/drivers/ata/sata_dwc_460ex.c
index 7f95389..aee8873 100644
--- a/drivers/ata/sata_dwc_460ex.c
+++ b/drivers/ata/sata_dwc_460ex.c
@@ -1151,7 +1151,13 @@ static struct scsi_host_template sata_dwc_sht = {
 	 */
 	.sg_tablesize		= LIBATA_MAX_PRD,
 	/* .can_queue		= ATA_MAX_QUEUE, */
-	.dma_boundary		= ATA_DMA_BOUNDARY,
+	/*
+	 * Make sure a LLI block is not created that will span 8K max FIS
+	 * boundary. If the block spans such a FIS boundary, there is a chance
+	 * that a DMA burst will cross that boundary -- this results in an
+	 * error in the host controller.
+	 */
+	.dma_boundary		= 0x1fff /* ATA_DMA_BOUNDARY */,
 };
 
 static struct ata_port_operations sata_dwc_ops = {
-- 
2.8.0.rc3