drivers/gpu/drm/arc/arcpgu_sim.c

   1 /*
   2  * ARC PGU DRM driver.
   3  *
   4  * Copyright (C) 2016 Synopsys, Inc. (www.synopsys.com)
   5  *
   6  * This program is free software; you can redistribute it and/or modify
   7  * it under the terms of the GNU General Public License version 2 as
   8  * published by the Free Software Foundation.
   9  *
  10  * This program is distributed in the hope that it will be useful,
  11  * but WITHOUT ANY WARRANTY; without even the implied warranty of
  12  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  13  * GNU General Public License for more details.
  14  *
  15  */
  16
  17 #include <drm/drm_crtc_helper.h>
  18 #include <drm/drm_encoder_slave.h>
  19 #include <drm/drm_atomic_helper.h>
  20
  21 #include "arcpgu.h"
  22
  23 #define XRES_DEF        640
  24 #define YRES_DEF        480
  25
  26 #define XRES_MAX        8192
  27 #define YRES_MAX        8192
  28
  29
  30 struct arcpgu_drm_connector {
  31         struct drm_connector connector;
  32         struct drm_encoder_slave *encoder_slave;
  33 };
  34
  35 static int arcpgu_drm_connector_get_modes(struct drm_connector *connector)
  36 {
  37         int count;
  38
  39         count = drm_add_modes_noedid(connector, XRES_MAX, YRES_MAX);
  40         drm_set_preferred_mode(connector, XRES_DEF, YRES_DEF);
  41         return count;
  42 }
  43
  44 static enum drm_connector_status
  45 arcpgu_drm_connector_detect(struct drm_connector *connector, bool force)
  46 {
  47         return connector_status_connected;
  48 }
  49
  50 static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
  51 {
  52         drm_connector_unregister(connector);
  53         drm_connector_cleanup(connector);
  54 }
  55
  56 static const struct drm_connector_helper_funcs
  57 arcpgu_drm_connector_helper_funcs = {
  58         .get_modes = arcpgu_drm_connector_get_modes,
  59 };
  60
  61 static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
  62         .dpms = drm_helper_connector_dpms,
  63         .reset = drm_atomic_helper_connector_reset,
  64         .detect = arcpgu_drm_connector_detect,
  65         .fill_modes = drm_helper_probe_single_connector_modes,
  66         .destroy = arcpgu_drm_connector_destroy,
  67         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  68         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  69 };
  70
  71 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
  72         .destroy = drm_encoder_cleanup,
  73 };
  74
  75 int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
  76 {
  77         struct arcpgu_drm_connector *arcpgu_connector;
  78         struct drm_encoder_slave *encoder;
  79         struct drm_connector *connector;
  80         int ret;
  81
  82         encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
  83         if (encoder == NULL)
  84                 return -ENOMEM;
  85
  86         encoder->base.possible_crtcs = 1;
  87         encoder->base.possible_clones = 0;
  88
  89         ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
  90                                DRM_MODE_ENCODER_VIRTUAL, NULL);
  91         if (ret)
  92                 return ret;
  93
  94         arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
  95                                         GFP_KERNEL);
  96         if (!arcpgu_connector) {
  97                 ret = -ENOMEM;
  98                 goto error_encoder_cleanup;
  99         }
 100
 101         connector = &arcpgu_connector->connector;
 102         drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
 103
 104         ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
 105                         DRM_MODE_CONNECTOR_VIRTUAL);
 106         if (ret < 0) {
 107                 dev_err(drm->dev, "failed to initialize drm connector\n");
 108                 goto error_encoder_cleanup;
 109         }
 110
 111         ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
 112         if (ret < 0) {
 113                 dev_err(drm->dev, "could not attach connector to encoder\n");
 114                 drm_connector_unregister(connector);
 115                 goto error_connector_cleanup;
 116         }
 117
 118         arcpgu_connector->encoder_slave = encoder;
 119
 120         return 0;
 121
 122 error_connector_cleanup:
 123         drm_connector_cleanup(connector);
 124
 125 error_encoder_cleanup:
 126         drm_encoder_cleanup(&encoder->base);
 127         return ret;
 128 }