drivers/gpu/drm/amd/display/dc/i2caux/i2c_engine.c

   1 /*
   2  * Copyright 2012-15 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  * Authors: AMD
  23  *
  24  */
  25
  26 #include "dm_services.h"
  27
  28 /*
  29  * Pre-requisites: headers required by header of this unit
  30  */
  31 #include "include/i2caux_interface.h"
  32 #include "engine.h"
  33
  34 /*
  35  * Header of this unit
  36  */
  37
  38 #include "i2c_engine.h"
  39
  40 /*
  41  * Post-requisites: headers required by this unit
  42  */
  43
  44 /*
  45  * This unit
  46  */
  47
  48 #define FROM_ENGINE(ptr) \
  49         container_of((ptr), struct i2c_engine, base)
  50
  51 bool dal_i2c_engine_acquire(
  52         struct engine *engine,
  53         struct ddc *ddc_handle)
  54 {
  55         struct i2c_engine *i2c_engine = FROM_ENGINE(engine);
  56
  57         uint32_t counter = 0;
  58         bool result;
  59
  60         do {
  61                 result = i2c_engine->funcs->acquire_engine(
  62                         i2c_engine, ddc_handle);
  63
  64                 if (result)
  65                         break;
  66
  67                 /* i2c_engine is busy by VBios, lets wait and retry */
  68
  69                 udelay(10);
  70
  71                 ++counter;
  72         } while (counter < 2);
  73
  74         if (result) {
  75                 if (!i2c_engine->funcs->setup_engine(i2c_engine)) {
  76                         engine->funcs->release_engine(engine);
  77                         result = false;
  78                 }
  79         }
  80
  81         return result;
  82 }
  83
  84 bool dal_i2c_engine_setup_i2c_engine(
  85         struct i2c_engine *engine)
  86 {
  87         /* Derivative classes do not have to override this */
  88
  89         return true;
  90 }
  91
  92 void dal_i2c_engine_submit_channel_request(
  93         struct i2c_engine *engine,
  94         struct i2c_request_transaction_data *request)
  95 {
  96
  97 }
  98
  99 void dal_i2c_engine_process_channel_reply(
 100         struct i2c_engine *engine,
 101         struct i2c_reply_transaction_data *reply)
 102 {
 103
 104 }
 105
 106 void dal_i2c_engine_construct(
 107         struct i2c_engine *engine,
 108         struct dc_context *ctx)
 109 {
 110         dal_i2caux_construct_engine(&engine->base, ctx);
 111         engine->timeout_delay = 0;
 112 }
 113
 114 void dal_i2c_engine_destruct(
 115         struct i2c_engine *engine)
 116 {
 117         dal_i2caux_destruct_engine(&engine->base);
 118 }