diff options
Diffstat (limited to 'drivers/ata/libata-core.c')
| -rw-r--r-- | drivers/ata/libata-core.c | 34 |
1 files changed, 34 insertions, 0 deletions
diff --git a/drivers/ata/libata-core.c b/drivers/ata/libata-core.c index 83613280928b..6fb4e8dc8c3c 100644 --- a/drivers/ata/libata-core.c +++ b/drivers/ata/libata-core.c @@ -2042,6 +2042,33 @@ void ata_dev_power_set_standby(struct ata_device *dev) err_mask); } +static bool ata_dev_power_is_active(struct ata_device *dev) +{ + struct ata_taskfile tf; + unsigned int err_mask; + + ata_tf_init(dev, &tf); + tf.flags |= ATA_TFLAG_DEVICE | ATA_TFLAG_ISADDR; + tf.protocol = ATA_PROT_NODATA; + tf.command = ATA_CMD_CHK_POWER; + + err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); + if (err_mask) { + ata_dev_err(dev, "Check power mode failed (err_mask=0x%x)\n", + err_mask); + /* + * Assume we are in standby mode so that we always force a + * spinup in ata_dev_power_set_active(). + */ + return false; + } + + ata_dev_dbg(dev, "Power mode: 0x%02x\n", tf.nsect); + + /* Active or idle */ + return tf.nsect == 0xff; +} + /** * ata_dev_power_set_active - Set a device power mode to active * @dev: target device @@ -2065,6 +2092,13 @@ void ata_dev_power_set_active(struct ata_device *dev) if (!ata_dev_power_init_tf(dev, &tf, true)) return; + /* + * Check the device power state & condition and force a spinup with + * VERIFY command only if the drive is not already ACTIVE or IDLE. + */ + if (ata_dev_power_is_active(dev)) + return; + ata_dev_notice(dev, "Entering active power mode\n"); err_mask = ata_exec_internal(dev, &tf, NULL, DMA_NONE, NULL, 0, 0); |