1 files changed, 8 insertions, 1 deletions
diff --git a/src/host/usbh.c b/src/host/usbh.c
index 7c4910af1..5b14a15cb 100644
--- a/src/host/usbh.c
+++ b/src/host/usbh.c
@@ -1066,7 +1066,14 @@ static bool usbh_edpt_control_open(uint8_t dev_addr, uint8_t max_packet_size) {
 }
 
 bool tuh_edpt_open(uint8_t dev_addr, tusb_desc_endpoint_t const* desc_ep) {
-  TU_ASSERT(tu_edpt_validate(desc_ep, tuh_speed_get(dev_addr), true));
+  // HACK: some device incorrectly always report 512 bulk regardless of link speed, overwrite descriptor to force 64
+  if (desc_ep->bmAttributes.xfer == TUSB_XFER_BULK && tu_edpt_packet_size(desc_ep) > 64 &&
+      tuh_speed_get(dev_addr) == TUSB_SPEED_FULL) {
+    TU_LOG1("  WARN: EP max packet size is 512 in fullspeed, force to 64\r\n");
+    tusb_desc_endpoint_t *hacked_ep = (tusb_desc_endpoint_t *)(uintptr_t)desc_ep;
+    hacked_ep->wMaxPacketSize       = tu_htole16(64);
+  }
+  TU_ASSERT(tu_edpt_validate(desc_ep, tuh_speed_get(dev_addr)));
   return hcd_edpt_open(usbh_get_rhport(dev_addr), dev_addr, desc_ep);
 }