drivers/gpu/drm/amd/display/dc/inc/link_enc_cfg.h

   1 /*
   2  * Copyright 2021 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 DC_INC_LINK_ENC_CFG_H_
  27 #define DC_INC_LINK_ENC_CFG_H_
  28
  29 /* This module implements functionality for dynamically assigning DIG link
  30  * encoder resources to display endpoints (links).
  31  */
  32
  33 #include "core_types.h"
  34
  35 /*
  36  * Initialise link encoder resource tracking.
  37  */
  38 void link_enc_cfg_init(
  39                 const struct dc *dc,
  40                 struct dc_state *state);
  41
  42 /*
  43  * Algorithm for assigning available DIG link encoders to streams.
  44  *
  45  * Update link_enc_assignments table and link_enc_avail list accordingly in
  46  * struct resource_context.
  47  *
  48  * Loop over all streams twice:
  49  * a) First assign encoders to unmappable endpoints.
  50  * b) Then assign encoders to mappable endpoints.
  51  */
  52 void link_enc_cfg_link_encs_assign(
  53                 struct dc *dc,
  54                 struct dc_state *state,
  55                 struct dc_stream_state *streams[],
  56                 uint8_t stream_count);
  57
  58 /*
  59  * Unassign a link encoder from a stream.
  60  *
  61  * Update link_enc_assignments table and link_enc_avail list accordingly in
  62  * struct resource_context.
  63  */
  64 void link_enc_cfg_link_enc_unassign(
  65                 struct dc_state *state,
  66                 struct dc_stream_state *stream);
  67
  68 /*
  69  * Check whether the transmitter driven by a link encoder is a mappable
  70  * endpoint.
  71  */
  72 bool link_enc_cfg_is_transmitter_mappable(
  73                 struct dc *dc,
  74                 struct link_encoder *link_enc);
  75
  76 /* Return stream using DIG link encoder resource. NULL if unused. */
  77 struct dc_stream_state *link_enc_cfg_get_stream_using_link_enc(
  78                 struct dc *dc,
  79                 enum engine_id eng_id);
  80
  81 /* Return link using DIG link encoder resource. NULL if unused. */
  82 struct dc_link *link_enc_cfg_get_link_using_link_enc(
  83                 struct dc *dc,
  84                 enum engine_id eng_id);
  85
  86 /* Return DIG link encoder used by link. NULL if unused. */
  87 struct link_encoder *link_enc_cfg_get_link_enc_used_by_link(
  88                 struct dc *dc,
  89                 const struct dc_link *link);
  90
  91 /* Return next available DIG link encoder. NULL if none available. */
  92 struct link_encoder *link_enc_cfg_get_next_avail_link_enc(struct dc *dc);
  93
  94 /* Return DIG link encoder used by stream. NULL if unused. */
  95 struct link_encoder *link_enc_cfg_get_link_enc_used_by_stream(
  96                 struct dc *dc,
  97                 const struct dc_stream_state *stream);
  98
  99 /* Return true if encoder available to use. */
 100 bool link_enc_cfg_is_link_enc_avail(struct dc *dc, enum engine_id eng_id);
 101
 102 /* Returns true if encoder assignments in supplied state pass validity checks. */
 103 bool link_enc_cfg_validate(struct dc *dc, struct dc_state *state);
 104
 105 #endif /* DC_INC_LINK_ENC_CFG_H_ */