--- zzzz-none-000/linux-4.4.271/drivers/usb/storage/scsiglue.c	2021-06-03 06:22:09.000000000 +0000
+++ hawkeye-5590-750/linux-4.4.271/drivers/usb/storage/scsiglue.c	2023-04-19 10:22:30.000000000 +0000
@@ -540,8 +540,37 @@
 }
 static DEVICE_ATTR_RW(max_sectors);
 
+#if defined (CONFIG_AVM_USB_PM)
+/* Output routine for the sysfs max_spinup_ms file */
+static ssize_t max_spinup_ms_show(struct device *dev, struct device_attribute *attr, char *buf)
+{
+	struct us_data *us = host_to_us(dev_to_shost(dev));
+
+	return sprintf(buf, "%u\n", us->max_spinup_ms);
+}
+
+/* Input routine for the sysfs max_sectors file */
+static ssize_t max_spinup_ms_store(struct device *dev, struct device_attribute *attr, const char *buf,
+		size_t count)
+{
+	struct us_data *us = host_to_us(dev_to_shost(dev));
+	unsigned int ms;
+
+	if (sscanf(buf, "%u", &ms) > 0) {
+		us->max_spinup_ms = ms;
+		return count;
+	}
+	return -EINVAL;
+}
+
+static DEVICE_ATTR_RW(max_spinup_ms);
+#endif
+
 static struct device_attribute *sysfs_device_attr_list[] = {
 	&dev_attr_max_sectors,
+#if defined (CONFIG_AVM_USB_PM)
+	&dev_attr_max_spinup_ms,
+#endif
 	NULL,
 };
 
@@ -578,8 +607,14 @@
 	/* lots of sg segments can be handled */
 	.sg_tablesize =			SCSI_MAX_SG_CHAIN_SEGMENTS,
 
+#if 1 
+	/* == AVM/VGJ 20160725 - Transfer speed optimization == */
+	/* limit the total size of a transfer to 512 KB to reduce USB irqs */
+	.max_sectors =                  1024,
+#else
 	/* limit the total size of a transfer to 120 KB */
 	.max_sectors =                  240,
+#endif
 
 	/* merge commands... this seems to help performance, but
 	 * periodically someone should test to see which setting is more