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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: Vinayak Kale <vinayak.kale@seagate.com> Signed-off-by: Tejun Heo <tj@kernel.org>
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1 changed files with 7 additions and 1 deletions
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@ -2912,12 +2912,14 @@ ata_scsi_map_proto(u8 byte1)
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case 5: /* PIO Data-out */
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return ATA_PROT_PIO;
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case 12: /* FPDMA */
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return ATA_PROT_NCQ;
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case 0: /* Hard Reset */
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case 1: /* SRST */
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case 8: /* Device Diagnostic */
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case 9: /* Device Reset */
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case 7: /* DMA Queued */
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case 12: /* FPDMA */
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case 15: /* Return Response Info */
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default: /* Reserved */
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break;
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@ -2990,6 +2992,10 @@ static unsigned int ata_scsi_pass_thru(struct ata_queued_cmd *qc)
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tf->command = cdb[9];
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}
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/* For NCQ commands with FPDMA protocol, copy the tag value */
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if (tf->protocol == ATA_PROT_NCQ)
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tf->nsect = qc->tag << 3;
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/* enforce correct master/slave bit */
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tf->device = dev->devno ?
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tf->device | ATA_DEV1 : tf->device & ~ATA_DEV1;
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