src/soc/amd/common/block/cpu/svi2.c

   1 /* SPDX-License-Identifier: GPL-2.0-only */
   2
   3 #include <amdblocks/cpu.h>
   4 #include <soc/msr.h>
   5 #include <types.h>
   6
   7 /* Value defined in Serial VID Interface 2.0 spec (#48022, NDA only) */
   8 #define  SERIAL_VID_2_DECODE_MICROVOLTS 6250
   9 #define  SERIAL_VID_2_MAX_MICROVOLTS    1550000L
  10
  11 uint32_t get_uvolts_from_vid(uint16_t core_vid)
  12 {
  13         if (core_vid >= 0xF8) {
  14                 /* Voltage off for VID codes >= 0xF8 */
  15                 return 0;
  16         } else {
  17                 return SERIAL_VID_2_MAX_MICROVOLTS -
  18                         (SERIAL_VID_2_DECODE_MICROVOLTS * core_vid);
  19         }
  20 }
  21
  22 uint32_t get_pstate_core_uvolts(union pstate_msr pstate_reg)
  23 {
  24         return get_uvolts_from_vid(pstate_reg.cpu_vid_0_7);
  25 }