scsi: pm80xx: Set RETFIS when requested by libsas

By default PM80xx HBAs return FIS only when a drive reports an error.
The RETFIS bit forces the controller to populate FIS even when a drive
reports no error.

Signed-off-by: Igor Pylypiv <ipylypiv@google.com>
Link: https://lore.kernel.org/r/20230819213040.1101044-3-ipylypiv@google.com
Reviewed-by: Niklas Cassel <niklas.cassel@wdc.com>
Reviewed-by: Damien Le Moal <dlemoal@kernel.org>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

Author: ipylypiv

drivers/scsi/pm8001/pm8001_hwi.c

@@ -4095,7 +4095,7 @@ static int pm8001_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 	u32 hdr_tag, ncg_tag = 0;
 	u64 phys_addr;
 	u32 ATAP = 0x0;
-	u32 dir;
+	u32 dir, retfis = 0;
 	u32  opc = OPC_INB_SATA_HOST_OPSTART;
 
 	memset(&sata_cmd, 0, sizeof(sata_cmd));
@@ -4124,8 +4124,11 @@ static int pm8001_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 	sata_cmd.tag = cpu_to_le32(tag);
 	sata_cmd.device_id = cpu_to_le32(pm8001_ha_dev->device_id);
 	sata_cmd.data_len = cpu_to_le32(task->total_xfer_len);
-	sata_cmd.ncqtag_atap_dir_m =
-		cpu_to_le32(((ncg_tag & 0xff)<<16)|((ATAP & 0x3f) << 10) | dir);
+	if (task->ata_task.return_fis_on_success)
+		retfis = 1;
+	sata_cmd.retfis_ncqtag_atap_dir_m =
+		cpu_to_le32((retfis << 24) | ((ncg_tag & 0xff) << 16) |
+			    ((ATAP & 0x3f) << 10) | dir);
 	sata_cmd.sata_fis = task->ata_task.fis;
 	if (likely(!task->ata_task.device_control_reg_update))
 		sata_cmd.sata_fis.flags |= 0x80;/* C=1: update ATA cmd reg */

drivers/scsi/pm8001/pm8001_hwi.h

@@ -515,7 +515,7 @@ struct sata_start_req {
 	__le32	tag;
 	__le32	device_id;
 	__le32	data_len;
-	__le32	ncqtag_atap_dir_m;
+	__le32	retfis_ncqtag_atap_dir_m;
 	struct host_to_dev_fis	sata_fis;
 	u32	reserved1;
 	u32	reserved2;

drivers/scsi/pm8001/pm80xx_hwi.c

@@ -4457,7 +4457,7 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 	u64 phys_addr, end_addr;
 	u32 end_addr_high, end_addr_low;
 	u32 ATAP = 0x0;
-	u32 dir;
+	u32 dir, retfis = 0;
 	u32 opc = OPC_INB_SATA_HOST_OPSTART;
 	memset(&sata_cmd, 0, sizeof(sata_cmd));
 
@@ -4487,7 +4487,8 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 	sata_cmd.tag = cpu_to_le32(tag);
 	sata_cmd.device_id = cpu_to_le32(pm8001_ha_dev->device_id);
 	sata_cmd.data_len = cpu_to_le32(task->total_xfer_len);
-
+	if (task->ata_task.return_fis_on_success)
+		retfis = 1;
 	sata_cmd.sata_fis = task->ata_task.fis;
 	if (likely(!task->ata_task.device_control_reg_update))
 		sata_cmd.sata_fis.flags |= 0x80;/* C=1: update ATA cmd reg */
@@ -4500,12 +4501,10 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 			   "Encryption enabled.Sending Encrypt SATA cmd 0x%x\n",
 			   sata_cmd.sata_fis.command);
 		opc = OPC_INB_SATA_DIF_ENC_IO;
-
-		/* set encryption bit */
-		sata_cmd.ncqtag_atap_dir_m_dad =
-			cpu_to_le32(((ncg_tag & 0xff)<<16)|
-				((ATAP & 0x3f) << 10) | 0x20 | dir);
-							/* dad (bit 0-1) is 0 */
+		/* set encryption bit; dad (bits 0-1) is 0 */
+		sata_cmd.retfis_ncqtag_atap_dir_m_dad =
+			cpu_to_le32((retfis << 24) | ((ncg_tag & 0xff) << 16) |
+				    ((ATAP & 0x3f) << 10) | 0x20 | dir);
 		/* fill in PRD (scatter/gather) table, if any */
 		if (task->num_scatter > 1) {
 			pm8001_chip_make_sg(task->scatter,
@@ -4568,11 +4567,10 @@ static int pm80xx_chip_sata_req(struct pm8001_hba_info *pm8001_ha,
 		pm8001_dbg(pm8001_ha, IO,
 			   "Sending Normal SATA command 0x%x inb %x\n",
 			   sata_cmd.sata_fis.command, q_index);
-		/* dad (bit 0-1) is 0 */
-		sata_cmd.ncqtag_atap_dir_m_dad =
-			cpu_to_le32(((ncg_tag & 0xff)<<16) |
-					((ATAP & 0x3f) << 10) | dir);
-
+		/* dad (bits 0-1) is 0 */
+		sata_cmd.retfis_ncqtag_atap_dir_m_dad =
+			cpu_to_le32((retfis << 24) | ((ncg_tag & 0xff) << 16) |
+				    ((ATAP & 0x3f) << 10) | dir);
 		/* fill in PRD (scatter/gather) table, if any */
 		if (task->num_scatter > 1) {
 			pm8001_chip_make_sg(task->scatter,

drivers/scsi/pm8001/pm80xx_hwi.h

@@ -731,7 +731,7 @@ struct sata_start_req {
 	__le32	tag;
 	__le32	device_id;
 	__le32	data_len;
-	__le32	ncqtag_atap_dir_m_dad;
+	__le32	retfis_ncqtag_atap_dir_m_dad;
 	struct host_to_dev_fis	sata_fis;
 	u32	reserved1;
 	u32	reserved2;	/* dword 11. rsvd for normal I/O. */