--- zzzz-none-000/linux-4.9.218/drivers/usb/storage/scsiglue.c	2020-04-02 15:20:41.000000000 +0000
+++ seale-7590ac-750/linux-4.9.218/drivers/usb/storage/scsiglue.c	2022-11-30 09:46:20.000000000 +0000
@@ -589,8 +589,37 @@
 }
 static DEVICE_ATTR_RW(max_sectors);
 
+#if defined (CONFIG_AVM_USB_SUSPEND)
+/* Output routine for the sysfs max_spinup_ms file */
+static ssize_t show_max_spinup_ms(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 store_max_spinup_ms(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(max_spinup_ms, S_IRUGO | S_IWUSR, show_max_spinup_ms, store_max_spinup_ms);
+#endif
+
 static struct device_attribute *sysfs_device_attr_list[] = {
 	&dev_attr_max_sectors,
+#if defined (CONFIG_AVM_USB_SUSPEND)
+		&dev_attr_max_spinup_ms,
+#endif
 	NULL,
 };
 
@@ -645,7 +674,14 @@
 	 * and Apple Mac OS X 10.11 limiting transfers to 256 sectors for USB2
 	 * and 2048 for USB3 devices.
 	 */
+#if defined (CONFIG_AVM_KERNEL)
+	/* == AVM/WK 20160420 - further 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