dcss-kms.c

  1// SPDX-License-Identifier: GPL-2.0
  2/*
  3 * Copyright 2019 NXP.
  4 */
  5
  6#include <drm/clients/drm_client_setup.h>
  7#include <drm/drm_atomic.h>
  8#include <drm/drm_atomic_helper.h>
  9#include <drm/drm_bridge.h>
 10#include <drm/drm_bridge_connector.h>
 11#include <drm/drm_drv.h>
 12#include <drm/drm_fbdev_dma.h>
 13#include <drm/drm_gem_dma_helper.h>
 14#include <drm/drm_gem_framebuffer_helper.h>
 15#include <drm/drm_of.h>
 16#include <drm/drm_probe_helper.h>
 17#include <drm/drm_vblank.h>
 18
 19#include "dcss-dev.h"
 20#include "dcss-kms.h"
 21
 22DEFINE_DRM_GEM_DMA_FOPS(dcss_cma_fops);
 23
 24static const struct drm_mode_config_funcs dcss_drm_mode_config_funcs = {
 25	.fb_create = drm_gem_fb_create,
 26	.atomic_check = drm_atomic_helper_check,
 27	.atomic_commit = drm_atomic_helper_commit,
 28};
 29
 30static const struct drm_driver dcss_kms_driver = {
 31	.driver_features	= DRIVER_MODESET | DRIVER_GEM | DRIVER_ATOMIC,
 32	DRM_GEM_DMA_DRIVER_OPS,
 33	DRM_FBDEV_DMA_DRIVER_OPS,
 34	.fops			= &dcss_cma_fops,
 35	.name			= "imx-dcss",
 36	.desc			= "i.MX8MQ Display Subsystem",
 37	.major			= 1,
 38	.minor			= 0,
 39	.patchlevel		= 0,
 40};
 41
 42static const struct drm_mode_config_helper_funcs dcss_mode_config_helpers = {
 43	.atomic_commit_tail = drm_atomic_helper_commit_tail_rpm,
 44};
 45
 46static void dcss_kms_mode_config_init(struct dcss_kms_dev *kms)
 47{
 48	struct drm_mode_config *config = &kms->base.mode_config;
 49
 50	drm_mode_config_init(&kms->base);
 51
 52	config->min_width = 1;
 53	config->min_height = 1;
 54	config->max_width = 4096;
 55	config->max_height = 4096;
 56	config->normalize_zpos = true;
 57
 58	config->funcs = &dcss_drm_mode_config_funcs;
 59	config->helper_private = &dcss_mode_config_helpers;
 60}
 61
 62static const struct drm_encoder_funcs dcss_kms_simple_encoder_funcs = {
 63	.destroy = drm_encoder_cleanup,
 64};
 65
 66static 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		return ret;
 99
100	kms->connector = drm_bridge_connector_init(ddev, encoder);
101	if (IS_ERR(kms->connector)) {
102		dev_err(ddev->dev, "Unable to create bridge connector.\n");
103		return PTR_ERR(kms->connector);
104	}
105
106	drm_connector_attach_encoder(kms->connector, encoder);
107
108	return 0;
109}
110
111struct dcss_kms_dev *dcss_kms_attach(struct dcss_dev *dcss)
112{
113	struct dcss_kms_dev *kms;
114	struct drm_device *drm;
115	struct dcss_crtc *crtc;
116	int ret;
117
118	kms = devm_drm_dev_alloc(dcss->dev, &dcss_kms_driver,
119				 struct dcss_kms_dev, base);
120	if (IS_ERR(kms))
121		return kms;
122
123	drm = &kms->base;
124	crtc = &kms->crtc;
125
126	drm->dev_private = dcss;
127
128	dcss_kms_mode_config_init(kms);
129
130	ret = drm_vblank_init(drm, 1);
131	if (ret)
132		goto cleanup_mode_config;
133
134	ret = dcss_kms_bridge_connector_init(kms);
135	if (ret)
136		goto cleanup_mode_config;
137
138	ret = dcss_crtc_init(crtc, drm);
139	if (ret)
140		goto cleanup_mode_config;
141
142	drm_mode_config_reset(drm);
143
144	drm_kms_helper_poll_init(drm);
145
146	ret = drm_dev_register(drm, 0);
147	if (ret)
148		goto cleanup_crtc;
149
150	drm_client_setup(drm, NULL);
151
152	return kms;
153
154cleanup_crtc:
155	drm_kms_helper_poll_fini(drm);
156	dcss_crtc_deinit(crtc, drm);
157
158cleanup_mode_config:
159	drm_mode_config_cleanup(drm);
160	drm->dev_private = NULL;
161
162	return ERR_PTR(ret);
163}
164
165void dcss_kms_detach(struct dcss_kms_dev *kms)
166{
167	struct drm_device *drm = &kms->base;
168
169	drm_dev_unregister(drm);
170	drm_kms_helper_poll_fini(drm);
171	drm_atomic_helper_shutdown(drm);
172	drm_crtc_vblank_off(&kms->crtc.base);
173	drm_mode_config_cleanup(drm);
174	dcss_crtc_deinit(&kms->crtc, drm);
175	drm->dev_private = NULL;
176}
177
178void dcss_kms_shutdown(struct dcss_kms_dev *kms)
179{
180	struct drm_device *drm = &kms->base;
181
182	drm_atomic_helper_shutdown(drm);
183}