LXR linux/drivers/gpu/drm/amd/display/dc/core/dc

   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 <linux/slab.h>
  27
  28#include "dm_services.h"
  29#include "dm_helpers.h"
  30#include "core_types.h"
  31
  32/*******************************************************************************
  33 * Private functions
  34 ******************************************************************************/
  35
  36static void destruct(struct dc_sink *sink)
  37{
  38        if (sink->dc_container_id) {
  39                kfree(sink->dc_container_id);
  40                sink->dc_container_id = NULL;
  41        }
  42}
  43
  44static bool construct(struct dc_sink *sink, const struct dc_sink_init_data *init_params)
  45{
  46
  47        struct dc_link *link = init_params->link;
  48
  49        if (!link)
  50                return false;
  51
  52        sink->sink_signal = init_params->sink_signal;
  53        sink->link = link;
  54        sink->ctx = link->ctx;
  55        sink->dongle_max_pix_clk = init_params->dongle_max_pix_clk;
  56        sink->converter_disable_audio = init_params->converter_disable_audio;
  57        sink->dc_container_id = NULL;
  58        sink->sink_id = init_params->link->ctx->dc_sink_id_count;
  59        // increment dc_sink_id_count because we don't want two sinks with same ID
  60        // unless they are actually the same
  61        init_params->link->ctx->dc_sink_id_count++;
  62
  63        return true;
  64}
  65
  66/*******************************************************************************
  67 * Public functions
  68 ******************************************************************************/
  69
  70void dc_sink_retain(struct dc_sink *sink)
  71{
  72        kref_get(&sink->refcount);
  73}
  74
  75static void dc_sink_free(struct kref *kref)
  76{
  77        struct dc_sink *sink = container_of(kref, struct dc_sink, refcount);
  78        destruct(sink);
  79        kfree(sink);
  80}
  81
  82void dc_sink_release(struct dc_sink *sink)
  83{
  84        kref_put(&sink->refcount, dc_sink_free);
  85}
  86
  87struct dc_sink *dc_sink_create(const struct dc_sink_init_data *init_params)
  88{
  89        struct dc_sink *sink = kzalloc(sizeof(*sink), GFP_KERNEL);
  90
  91        if (NULL == sink)
  92                goto alloc_fail;
  93
  94        if (false == construct(sink, init_params))
  95                goto construct_fail;
  96
  97        kref_init(&sink->refcount);
  98
  99        return sink;
 100
 101construct_fail:
 102        kfree(sink);
 103
 104alloc_fail:
 105        return NULL;
 106}
 107
 108/*******************************************************************************
 109 * Protected functions - visible only inside of DC (not visible in DM)
 110 ******************************************************************************/
 111