[libata scsi] add START STOP UNIT translation (972dcafb) · Commits · e / devices / android_kernel_oneplus_sm8150

drivers/scsi/libata-scsi.c

+56 −0

Original line number	Diff line number	Diff line
		@@ -391,6 +391,60 @@ int ata_scsi_error(struct Scsi_Host *host)
		return 0;
		}

		/**
		* ata_scsi_start_stop_xlat - Translate SCSI START STOP UNIT command
		* @qc: Storage for translated ATA taskfile
		* @scsicmd: SCSI command to translate
		*
		* Sets up an ATA taskfile to issue STANDBY (to stop) or READ VERIFY
		* (to start). Perhaps these commands should be preceded by
		* CHECK POWER MODE to see what power mode the device is already in.
		* [See SAT revision 5 at www.t10.org]
		*
		* LOCKING:
		* spin_lock_irqsave(host_set lock)
		*
		* RETURNS:
		* Zero on success, non-zero on error.
		*/

		static unsigned int ata_scsi_start_stop_xlat(struct ata_queued_cmd *qc,
		u8 *scsicmd)
		{
		struct ata_taskfile *tf = &qc->tf;

		tf->flags \|= ATA_TFLAG_DEVICE \| ATA_TFLAG_ISADDR;
		tf->protocol = ATA_PROT_NODATA;
		if (scsicmd[1] & 0x1) {
		; /* ignore IMMED bit, violates sat-r05 */
		}
		if (scsicmd[4] & 0x2)
		return 1; /* LOEJ bit set not supported */
		if (((scsicmd[4] >> 4) & 0xf) != 0)
		return 1; /* power conditions not supported */
		if (scsicmd[4] & 0x1) {
		tf->nsect = 1; /* 1 sector, lba=0 */
		tf->lbah = 0x0;
		tf->lbam = 0x0;
		tf->lbal = 0x0;
		tf->device \|= ATA_LBA;
		tf->command = ATA_CMD_VERIFY; /* READ VERIFY */
		} else {
		tf->nsect = 0; /* time period value (0 implies now) */
		tf->command = ATA_CMD_STANDBY;
		/* Consider: ATA STANDBY IMMEDIATE command */
		}
		/*
		* Standby and Idle condition timers could be implemented but that
		* would require libata to implement the Power condition mode page
		* and allow the user to change it. Changing mode pages requires
		* MODE SELECT to be implemented.
		*/

		return 0;
		}


		/**
		* ata_scsi_flush_xlat - Translate SCSI SYNCHRONIZE CACHE command
		* @qc: Storage for translated ATA taskfile
		@@ -1435,6 +1489,8 @@ static inline ata_xlat_func_t ata_get_xlat_func(struct ata_device *dev, u8 cmd)
		case VERIFY:
		case VERIFY_16:
		return ata_scsi_verify_xlat;
		case START_STOP:
		return ata_scsi_start_stop_xlat;
		}

		return NULL;

include/linux/ata.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -108,6 +108,8 @@ enum {

		/* ATA device commands */
		ATA_CMD_CHK_POWER = 0xE5, /* check power mode */
		ATA_CMD_STANDBY = 0xE2, /* place in standby power mode */
		ATA_CMD_IDLE = 0xE3, /* place in idle power mode */
		ATA_CMD_EDD = 0x90, /* execute device diagnostic */
		ATA_CMD_FLUSH = 0xE7,
		ATA_CMD_FLUSH_EXT = 0xEA,