drivers/gpu/drm/amd/display/dc/dce/dce_i2c.c

   1 /*
   2  * Copyright 2018 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 #include "dce_i2c.h"
  26 #include "reg_helper.h"
  27
  28 bool dce_i2c_submit_command(
  29         struct resource_pool *pool,
  30         struct ddc *ddc,
  31         struct i2c_command *cmd)
  32 {
  33         struct dce_i2c_hw *dce_i2c_hw;
  34         struct dce_i2c_sw dce_i2c_sw = {0};
  35
  36         if (!ddc) {
  37                 BREAK_TO_DEBUGGER();
  38                 return false;
  39         }
  40
  41         if (!cmd) {
  42                 BREAK_TO_DEBUGGER();
  43                 return false;
  44         }
  45
  46         dce_i2c_hw = acquire_i2c_hw_engine(pool, ddc);
  47
  48         if (dce_i2c_hw)
  49                 return dce_i2c_submit_command_hw(pool, ddc, cmd, dce_i2c_hw);
  50
  51         dce_i2c_sw.ctx = ddc->ctx;
  52         if (dce_i2c_engine_acquire_sw(&dce_i2c_sw, ddc)) {
  53                 return dce_i2c_submit_command_sw(pool, ddc, cmd, &dce_i2c_sw);
  54         }
  55
  56         return false;
  57 }