src/soc/mediatek/mt8196/usb.c

   1 /* SPDX-License-Identifier: GPL-2.0-only OR MIT */
   2
   3 /*
   4  * This file is created based on MT8188 Functional Specification
   5  * Chapter number: 13.1,13.2
   6  */
   7
   8 #include <soc/addressmap.h>
   9 #include <device/mmio.h>
  10 #include <soc/usb.h>
  11
  12 #define CTRL_U3_PORT_SS_SUP_SPEED      (3U << 9)
  13
  14 void mtk_usb_prepare(void)
  15 {
  16         /* SW sets this register to change USB3.2 speed to Gen1-5Gbps */
  17         struct ssusb_ippc_regs *ippc_regs = (void *)(SSUSB_IPPC_BASE);
  18
  19         clrsetbits32(&ippc_regs->u3_ctrl_p[0], CTRL_U3_PORT_SS_SUP_SPEED, 0);
  20 }