usb: mtu3: fix interval value for intr and isoc

Use the Interval value from isoc/intr endpoint descriptor, no need
minus one. The original code doesn't cause transfer error for
normal cases, but it may have side effect with respond time of ERDY
or tPingTimeout.

Signed-off-by: Chunfeng Yun <chunfeng.yun@mediatek.com>
Link: https://lore.kernel.org/r/20211218095749.6250-1-chunfeng.yun@mediatek.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/mtu3/mtu3_gadget.c b/drivers/usb/mtu3/mtu3_gadget.c
index a9a65b4bbfedea1e0cb1437b678d5c909020b2b3..c51be015345b9e7d16042bc0bdfcb1936661ddc3 100644 (file)
--- a/drivers/usb/mtu3/mtu3_gadget.c
+++ b/drivers/usb/mtu3/mtu3_gadget.c
@@ -77,7 +77,7 @@ static int mtu3_ep_enable(struct mtu3_ep *mep)
                if (usb_endpoint_xfer_int(desc) ||
                                usb_endpoint_xfer_isoc(desc)) {
                        interval = desc->bInterval;
-                       interval = clamp_val(interval, 1, 16) - 1;
+                       interval = clamp_val(interval, 1, 16);
                        if (usb_endpoint_xfer_isoc(desc) && comp_desc)
                                mult = comp_desc->bmAttributes;
                }
@@ -89,7 +89,7 @@ static int mtu3_ep_enable(struct mtu3_ep *mep)
                if (usb_endpoint_xfer_isoc(desc) ||
                                usb_endpoint_xfer_int(desc)) {
                        interval = desc->bInterval;
-                       interval = clamp_val(interval, 1, 16) - 1;
+                       interval = clamp_val(interval, 1, 16);
                        mult = usb_endpoint_maxp_mult(desc) - 1;
                }
                break;