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 void arcpgu_drm_connector_destroy(struct drm_connector *connector)
  45 {
  46         drm_connector_unregister(connector);
  47         drm_connector_cleanup(connector);
  48 }
  49
  50 static const struct drm_connector_helper_funcs
  51 arcpgu_drm_connector_helper_funcs = {
  52         .get_modes = arcpgu_drm_connector_get_modes,
  53 };
  54
  55 static const struct drm_connector_funcs arcpgu_drm_connector_funcs = {
  56         .dpms = drm_helper_connector_dpms,
  57         .reset = drm_atomic_helper_connector_reset,
  58         .fill_modes = drm_helper_probe_single_connector_modes,
  59         .destroy = arcpgu_drm_connector_destroy,
  60         .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
  61         .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
  62 };
  63
  64 static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
  65         .destroy = drm_encoder_cleanup,
  66 };
  67
  68 int arcpgu_drm_sim_init(struct drm_device *drm, struct device_node *np)
  69 {
  70         struct arcpgu_drm_connector *arcpgu_connector;
  71         struct drm_encoder_slave *encoder;
  72         struct drm_connector *connector;
  73         int ret;
  74
  75         encoder = devm_kzalloc(drm->dev, sizeof(*encoder), GFP_KERNEL);
  76         if (encoder == NULL)
  77                 return -ENOMEM;
  78
  79         encoder->base.possible_crtcs = 1;
  80         encoder->base.possible_clones = 0;
  81
  82         ret = drm_encoder_init(drm, &encoder->base, &arcpgu_drm_encoder_funcs,
  83                                DRM_MODE_ENCODER_VIRTUAL, NULL);
  84         if (ret)
  85                 return ret;
  86
  87         arcpgu_connector = devm_kzalloc(drm->dev, sizeof(*arcpgu_connector),
  88                                         GFP_KERNEL);
  89         if (!arcpgu_connector) {
  90                 ret = -ENOMEM;
  91                 goto error_encoder_cleanup;
  92         }
  93
  94         connector = &arcpgu_connector->connector;
  95         drm_connector_helper_add(connector, &arcpgu_drm_connector_helper_funcs);
  96
  97         ret = drm_connector_init(drm, connector, &arcpgu_drm_connector_funcs,
  98                         DRM_MODE_CONNECTOR_VIRTUAL);
  99         if (ret < 0) {
 100                 dev_err(drm->dev, "failed to initialize drm connector\n");
 101                 goto error_encoder_cleanup;
 102         }
 103
 104         ret = drm_mode_connector_attach_encoder(connector, &encoder->base);
 105         if (ret < 0) {
 106                 dev_err(drm->dev, "could not attach connector to encoder\n");
 107                 drm_connector_unregister(connector);
 108                 goto error_connector_cleanup;
 109         }
 110
 111         arcpgu_connector->encoder_slave = encoder;
 112
 113         return 0;
 114
 115 error_connector_cleanup:
 116         drm_connector_cleanup(connector);
 117
 118 error_encoder_cleanup:
 119         drm_encoder_cleanup(&encoder->base);
 120         return ret;
 121 }