Re: [PATCH v2 03/23] ata: sata_dwc_460ex: set dma_boundary to 0x1fff
From: Tejun Heo <tj@kernel.org>
Date: 2016-05-08 19:41:35
Also in:
linux-ide, lkml
On Tue, Apr 26, 2016 at 12:03:04PM +0300, Andy Shevchenko wrote:
quoted hunk ↗ jump to hunk
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 */,
The host controller can't cross 8k boundary? Is this for real? -- tejun