drivers/gpu/drm/imx/dcss/dcss-kms.c

   1 // SPDX-License-Identifier: GPL-2.0
   2 /*
   3  * Copyright 2019 NXP.
   4  */
   5
   6 #include <drm/drm_atomic.h>
   7 #include <drm/drm_atomic_helper.h>
   8 #include <drm/drm_bridge_connector.h>
   9 #include <drm/drm_drv.h>
  10 #include <drm/drm_fb_helper.h>
  11 #include <drm/drm_gem_cma_helper.h>
  12 #include <drm/drm_gem_framebuffer_helper.h>
  13 #include <drm/drm_of.h>
  14 #include <drm/drm_probe_helper.h>
  15 #include <drm/drm_vblank.h>
  16
  17 #include "dcss-dev.h"
  18 #include "dcss-kms.h"
  19
  20 DEFINE_DRM_GEM_CMA_FOPS(dcss_cma_fops);
  21
  22 static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
  23         .fb_create = drm_gem_fb_create,
  24         .output_poll_changed = drm_fb_helper_output_poll_changed,
  25         .atomic_check = drm_atomic_helper_check,
  26         .atomic_commit = drm_atomic_helper_commit,
  27 };
  28
  29 static const struct drm_driver dcss_kms_driver = {
  30         .driver_features        = DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
  31         DRM_GEM_CMA_DRIVER_OPS,
  32         .fops                   = &dcss_cma_fops,
  33         .name                   = "imx-dcss",
  34         .desc                   = "i.MX8MQ Display Subsystem",
  35         .date                   = "20190917",
  36         .major                  = 1,
  37         .minor                  = 0,
  38         .patchlevel             = 0,
  39 };
  40
  41 static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
  42         .atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
  43 };
  44
  45 static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
  46 {
  47         struct drm_mode_config *config = &kms->base.mode_config;
  48
  49         drm_mode_config_init(&kms->base);
  50
  51         config->min_width = 1;
  52         config->min_height = 1;
  53         config->max_width = 4096;
  54         config->max_height = 4096;
  55         config->allow_fb_modifiers = true;
  56         config->normalize_zpos = true;
  57
  58         config->funcs = &dcss_drm_mode_config_funcs;
  59         config->helper_private = &dcss_mode_config_helpers;
  60 }
  61
  62 static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
  63         .destroy = drm_encoder_cleanup,
  64 };
  65
  66 static int dcss_kms_bridge_connector_init(struct dcss_kms_dev *kms)
  67 {
  68         struct drm_device *ddev = &kms->base;
  69         struct drm_encoder *encoder = &kms->encoder;
  70         struct drm_crtc *crtc = (struct drm_crtc *)&kms->crtc;
  71         struct drm_panel *panel;
  72         struct drm_bridge *bridge;
  73         int ret;
  74
  75         ret = drm_of_find_panel_or_bridge(ddev->dev->of_node, 0, 0,
  76                                           &panel, &bridge);
  77         if (ret)
  78                 return ret;
  79
  80         if (!bridge) {
  81                 dev_err(ddev->dev, "No bridge found %d.\n", ret);
  82                 return -ENODEV;
  83         }
  84
  85         encoder->possible_crtcs = drm_crtc_mask(crtc);
  86
  87         ret = drm_encoder_init(&kms->base, encoder,
  88                                &dcss_kms_simple_encoder_funcs,
  89                                DRM_MODE_ENCODER_NONE, NULL);
  90         if (ret) {
  91                 dev_err(ddev->dev, "Failed initializing encoder %d.\n", ret);
  92                 return ret;
  93         }
  94
  95         ret = drm_bridge_attach(encoder, bridge, NULL,
  96                                 DRM_BRIDGE_ATTACH_NO_CONNECTOR);
  97         if (ret < 0) {
  98                 dev_err(ddev->dev, "Unable to attach bridge %pOF\n",
  99                         bridge->of_node);
 100                 return ret;
 101         }
 102
 103         kms->connector = drm_bridge_connector_init(ddev, encoder);
 104         if (IS_ERR(kms->connector)) {
 105                 dev_err(ddev->dev, "Unable to create bridge connector.\n");
 106                 return PTR_ERR(kms->connector);
 107         }
 108
 109         drm_connector_attach_encoder(kms->connector, encoder);
 110
 111         return 0;
 112 }
 113
 114 struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
 115 {
 116         struct dcss_kms_dev *kms;
 117         struct drm_device *drm;
 118         struct dcss_crtc *crtc;
 119         int ret;
 120
 121         kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
 122                                  struct dcss_kms_dev, base);
 123         if (IS_ERR(kms))
 124                 return kms;
 125
 126         drm = &kms->base;
 127         crtc = &kms->crtc;
 128
 129         drm->dev_private = dcss;
 130
 131         dcss_kms_mode_config_init(kms);
 132
 133         ret = drm_vblank_init(drm, 1);
 134         if (ret)
 135                 goto cleanup_mode_config;
 136
 137         drm->irq_enabled = true;
 138
 139         ret = dcss_kms_bridge_connector_init(kms);
 140         if (ret)
 141                 goto cleanup_mode_config;
 142
 143         ret = dcss_crtc_init(crtc, drm);
 144         if (ret)
 145                 goto cleanup_mode_config;
 146
 147         drm_mode_config_reset(drm);
 148
 149         drm_kms_helper_poll_init(drm);
 150
 151         drm_bridge_connector_enable_hpd(kms->connector);
 152
 153         ret = drm_dev_register(drm, 0);
 154         if (ret)
 155                 goto cleanup_crtc;
 156
 157         drm_fbdev_generic_setup(drm, 32);
 158
 159         return kms;
 160
 161 cleanup_crtc:
 162         drm_bridge_connector_disable_hpd(kms->connector);
 163         drm_kms_helper_poll_fini(drm);
 164         dcss_crtc_deinit(crtc, drm);
 165
 166 cleanup_mode_config:
 167         drm_mode_config_cleanup(drm);
 168         drm->dev_private = NULL;
 169
 170         return ERR_PTR(ret);
 171 }
 172
 173 void dcss_kms_detach(struct dcss_kms_dev *kms)
 174 {
 175         struct drm_device *drm = &kms->base;
 176
 177         drm_dev_unregister(drm);
 178         drm_bridge_connector_disable_hpd(kms->connector);
 179         drm_kms_helper_poll_fini(drm);
 180         drm_atomic_helper_shutdown(drm);
 181         drm_crtc_vblank_off(&kms->crtc.base);
 182         drm->irq_enabled = false;
 183         drm_mode_config_cleanup(drm);
 184         dcss_crtc_deinit(&kms->crtc, drm);
 185         drm->dev_private = NULL;
 186 }