drivers/gpu/drm/amd/display/include/i2caux_interface.h

   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 #ifndef __DAL_I2CAUX_INTERFACE_H__
  27 #define __DAL_I2CAUX_INTERFACE_H__
  28
  29 #include "dc_types.h"
  30 #include "gpio_service_interface.h"
  31
  32
  33 #define DEFAULT_AUX_MAX_DATA_SIZE 16
  34 #define AUX_MAX_DEFER_WRITE_RETRY 20
  35
  36 struct aux_payload {
  37         /* set following flag to read/write I2C data,
  38          * reset it to read/write DPCD data */
  39         bool i2c_over_aux;
  40         /* set following flag to write data,
  41          * reset it to read data */
  42         bool write;
  43         bool mot;
  44         uint32_t address;
  45         uint32_t length;
  46         uint8_t *data;
  47         /*
  48          * used to return the reply type of the transaction
  49          * ignored if NULL
  50          */
  51         uint8_t *reply;
  52         /* expressed in milliseconds
  53          * zero means "use default value"
  54          */
  55         uint32_t defer_delay;
  56 };
  57
  58 struct aux_command {
  59         struct aux_payload *payloads;
  60         uint8_t number_of_payloads;
  61
  62         /* expressed in milliseconds
  63          * zero means "use default value" */
  64         uint32_t defer_delay;
  65
  66         /* zero means "use default value" */
  67         uint32_t max_defer_write_retry;
  68
  69         enum i2c_mot_mode mot;
  70 };
  71
  72 union aux_config {
  73         struct {
  74                 uint32_t ALLOW_AUX_WHEN_HPD_LOW:1;
  75         } bits;
  76         uint32_t raw;
  77 };
  78
  79 #endif