drivers/gpu/drm/amd/powerplay/hwmgr/pp_acpi.c

   1 /*
   2  * Copyright 2016 Advanced Micro Devices, Inc.
   3  *
   4  * Permission is hereby granted, free of charge, to any person obtaining a
   5  * copy of this software and associated documentation files (the "Software"),
   6  * to deal in the Software without restriction, including without limitation
   7  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
   8  * and/or sell copies of the Software, and to permit persons to whom the
   9  * Software is furnished to do so, subject to the following conditions:
  10  *
  11  * The above copyright notice and this permission notice shall be included in
  12  * all copies or substantial portions of the Software.
  13  *
  14  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  15  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  16  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  17  * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR
  18  * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
  19  * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
  20  * OTHER DEALINGS IN THE SOFTWARE.
  21  *
  22  */
  23
  24 #include <linux/errno.h>
  25 #include "linux/delay.h"
  26 #include "hwmgr.h"
  27 #include "amd_acpi.h"
  28
  29 bool acpi_atcs_functions_supported(void *device, uint32_t index)
  30 {
  31         int32_t result;
  32         struct atcs_verify_interface output_buf = {0};
  33
  34         int32_t temp_buffer = 1;
  35
  36         result = cgs_call_acpi_method(device, CGS_ACPI_METHOD_ATCS,
  37                                                 ATCS_FUNCTION_VERIFY_INTERFACE,
  38                                                 &temp_buffer,
  39                                                 &output_buf,
  40                                                 1,
  41                                                 sizeof(temp_buffer),
  42                                                 sizeof(output_buf));
  43
  44         return result == 0 ? (output_buf.function_bits & (1 << (index - 1))) != 0 : false;
  45 }
  46
  47 int acpi_pcie_perf_request(void *device, uint8_t perf_req, bool advertise)
  48 {
  49         struct atcs_pref_req_input atcs_input;
  50         struct atcs_pref_req_output atcs_output;
  51         u32 retry = 3;
  52         int result;
  53         struct cgs_system_info info = {0};
  54
  55         if (!acpi_atcs_functions_supported(device, ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST))
  56                 return -EINVAL;
  57
  58         info.size = sizeof(struct cgs_system_info);
  59         info.info_id = CGS_SYSTEM_INFO_ADAPTER_BDF_ID;
  60         result = cgs_query_system_info(device, &info);
  61         if (result != 0)
  62                 return -EINVAL;
  63         atcs_input.client_id = (uint16_t)info.value;
  64         atcs_input.size = sizeof(struct atcs_pref_req_input);
  65         atcs_input.valid_flags_mask = ATCS_VALID_FLAGS_MASK;
  66         atcs_input.flags = ATCS_WAIT_FOR_COMPLETION;
  67         if (advertise)
  68                 atcs_input.flags |= ATCS_ADVERTISE_CAPS;
  69         atcs_input.req_type = ATCS_PCIE_LINK_SPEED;
  70         atcs_input.perf_req = perf_req;
  71
  72         atcs_output.size = sizeof(struct atcs_pref_req_input);
  73
  74         while (retry--) {
  75                 result = cgs_call_acpi_method(device,
  76                                                 CGS_ACPI_METHOD_ATCS,
  77                                                 ATCS_FUNCTION_PCIE_PERFORMANCE_REQUEST,
  78                                                 &atcs_input,
  79                                                 &atcs_output,
  80                                                 0,
  81                                                 sizeof(atcs_input),
  82                                                 sizeof(atcs_output));
  83                 if (result != 0)
  84                         return -EIO;
  85
  86                 switch (atcs_output.ret_val) {
  87                 case ATCS_REQUEST_REFUSED:
  88                 default:
  89                         return -EINVAL;
  90                 case ATCS_REQUEST_COMPLETE:
  91                         return 0;
  92                 case ATCS_REQUEST_IN_PROGRESS:
  93                         udelay(10);
  94                         break;
  95                 }
  96         }
  97
  98         return 0;
  99 }