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
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);