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Commit ee7fb331 authored by Vinayak Kale's avatar Vinayak Kale Committed by Tejun Heo
Browse files

libata: add support for NCQ commands for SG interface 



This patch is needed to make NCQ commands with FPDMA protocol value
(eg READ/WRITE FPDMA) work over SCSI Generic (SG) interface.

Signed-off-by: default avatarVinayak Kale <vinayak.kale@seagate.com>
Signed-off-by: default avatarTejun Heo <tj@kernel.org>
parent eb351031

drivers/ata/libata-scsi.c

+7 −1
Original line number Diff line number Diff line
@@ -2912,12 +2912,14 @@ ata_scsi_map_proto(u8 byte1) 
	case 5:		/* PIO Data-out */

		return ATA_PROT_PIO;



	case 12:	/* FPDMA */

		return ATA_PROT_NCQ;



	case 0:		/* Hard Reset */

	case 1:		/* SRST */

	case 8:		/* Device Diagnostic */

	case 9:		/* Device Reset */

	case 7:		/* DMA Queued */

	case 12:	/* FPDMA */

	case 15:	/* Return Response Info */

	default:	/* Reserved */

		break;
@@ -2990,6 +2992,10 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc) 
		tf->command = cdb[9];

	}



	/* For NCQ commands with FPDMA protocol, copy the tag value */

	if (tf->protocol == ATA_PROT_NCQ)

		tf->nsect = qc->tag << 3;



	/* enforce correct master/slave bit */

	tf->device = dev->devno ?

		tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;