LXR linux/drivers/gpu/drm/arc/arcpgu

   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
  30struct arcpgu_drm_connector {
  31        struct drm_connector connector;
  32        struct drm_encoder_slave *encoder_slave;
  33};
  34
  35static 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
  44static enum drm_connector_status
  45arcpgu_drm_connector_detect(struct drm_connector *connector, bool force)
  46{
  47        return connector_status_connected;
  48}
  49
  50static void arcpgu_drm_connector_destroy(struct drm_connector *connector)
  51{
  52        drm_connector_unregister(connector);
  53        drm_connector_cleanup(connector);
  54}
  55
  56static const struct drm_connector_helper_funcs
  57arcpgu_drm_connector_helper_funcs = {
  58        .get_modes = arcpgu_drm_connector_get_modes,
  59};
  60
  61static 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
  71static struct drm_encoder_funcs arcpgu_drm_encoder_funcs = {
  72        .destroy = drm_encoder_cleanup,
  73};
  74
  75int 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
 122error_connector_cleanup:
 123        drm_connector_cleanup(connector);
 124
 125error_encoder_cleanup:
 126        drm_encoder_cleanup(&encoder->base);
 127        return ret;
 128}
 129