From: Mark Lord Date: Tue, 17 Apr 2007 22:26:07 +0000 (-0400) Subject: libata: Handle drives that require a spin-up command before first access X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=169439c2e35f01e7832a9b4fc8a7446980c3d593;p=GitHub%2FLineageOS%2Fandroid_kernel_samsung_universal7580.git libata: Handle drives that require a spin-up command before first access (S)ATA drives can be configured for "power-up in standby", a mode whereby a specific "spin up now!" command is required before the first media access. Currently, a drive with this feature enabled can not be used at all with libata, and once in this mode, the drive becomes a doorstop. The older drivers/ide subsystem at least enumerates the drive, so that it can be woken up after the fact from a userspace HDIO_* command, but not libata. This patch adds support to libata for the "power-up in standby" mode where a "spin up now!" command (SET_FEATURES) is needed. With this, libata will recognize such drives, spin them up, and then re-IDENTIFY them if necessary to get a full/complete set of drive features data. Drives in this state are determined by looking for special values in id[2], as documented in the current ATA specs. Signed-off-by: Mark Lord Signed-off-by: Jeff Garzik --- diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 6d0a946afe8..227399e4847 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -1649,13 +1649,13 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class, struct ata_taskfile tf; unsigned int err_mask = 0; const char *reason; + int tried_spinup = 0; int rc; if (ata_msg_ctl(ap)) ata_dev_printk(dev, KERN_DEBUG, "%s: ENTER\n", __FUNCTION__); ata_dev_select(ap, dev->devno, 1, 1); /* select device 0/1 */ - retry: ata_tf_init(dev, &tf); @@ -1712,6 +1712,32 @@ int ata_dev_read_id(struct ata_device *dev, unsigned int *p_class, goto err_out; } + if (!tried_spinup && (id[2] == 0x37c8 || id[2] == 0x738c)) { + tried_spinup = 1; + /* + * Drive powered-up in standby mode, and requires a specific + * SET_FEATURES spin-up subcommand before it will accept + * anything other than the original IDENTIFY command. + */ + ata_tf_init(dev, &tf); + tf.command = ATA_CMD_SET_FEATURES; + tf.feature = SETFEATURES_SPINUP; + tf.protocol = ATA_PROT_NODATA; + tf.flags |= ATA_TFLAG_ISADDR | ATA_TFLAG_DEVICE; + err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0); + if (err_mask) { + rc = -EIO; + reason = "SPINUP failed"; + goto err_out; + } + /* + * If the drive initially returned incomplete IDENTIFY info, + * we now must reissue the IDENTIFY command. + */ + if (id[2] == 0x37c8) + goto retry; + } + if ((flags & ATA_READID_POSTRESET) && class == ATA_DEV_ATA) { /* * The exact sequence expected by certain pre-ATA4 drives is: diff --git a/include/linux/ata.h b/include/linux/ata.h index f4dc8dfeadc..edb31bfff68 100644 --- a/include/linux/ata.h +++ b/include/linux/ata.h @@ -202,6 +202,8 @@ enum { SETFEATURES_WC_ON = 0x02, /* Enable write cache */ SETFEATURES_WC_OFF = 0x82, /* Disable write cache */ + SETFEATURES_SPINUP = 0x07, /* Spin-up drive */ + /* ATAPI stuff */ ATAPI_PKT_DMA = (1 << 0), ATAPI_DMADIR = (1 << 2), /* ATAPI data dir: