USB: ftdi_sio: set device latency timeout at port probe
No need to set latency timeout at every open.
This also fixes an issue with the read latency being as high as 250ms
(instead of 1ms) for the first read after port probe.
Signed-off-by: Johan Hovold <jhovold@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
diff --git a/drivers/usb/serial/ftdi_sio.c b/drivers/usb/serial/ftdi_sio.c
index 89284df2..d3e58b5 100644
--- a/drivers/usb/serial/ftdi_sio.c
+++ b/drivers/usb/serial/ftdi_sio.c
@@ -1589,6 +1589,7 @@
ftdi_set_max_packet_size(port);
if (read_latency_timer(port) < 0)
priv->latency = 16;
+ write_latency_timer(port);
create_sysfs_attrs(port);
return 0;
}
@@ -1717,8 +1718,6 @@
dbg("%s", __func__);
- write_latency_timer(port);
-
/* No error checking for this (will get errors later anyway) */
/* See ftdi_sio.h for description of what is reset */
usb_control_msg(dev, usb_sndctrlpipe(dev, 0),
