1 // SPDX-License-Identifier: GPL-2.0
3 * (C) COPYRIGHT 2018 ARM Limited. All rights reserved.
4 * Author: James.Qian.Wang <james.qian.wang@arm.com>
7 #include <linux/component.h>
8 #include <linux/interrupt.h>
10 #include <drm/drm_atomic.h>
11 #include <drm/drm_atomic_helper.h>
12 #include <drm/drm_drv.h>
13 #include <drm/drm_fb_helper.h>
14 #include <drm/drm_gem_cma_helper.h>
15 #include <drm/drm_gem_framebuffer_helper.h>
16 #include <drm/drm_irq.h>
17 #include <drm/drm_vblank.h>
19 #include "komeda_dev.h"
20 #include "komeda_framebuffer.h"
21 #include "komeda_kms.h"
23 DEFINE_DRM_GEM_CMA_FOPS(komeda_cma_fops);
25 static int komeda_gem_cma_dumb_create(struct drm_file *file,
26 struct drm_device *dev,
27 struct drm_mode_create_dumb *args)
29 struct komeda_dev *mdev = dev->dev_private;
30 u32 pitch = DIV_ROUND_UP(args->width * args->bpp, 8);
32 args->pitch = ALIGN(pitch, mdev->chip.bus_width);
34 return drm_gem_cma_dumb_create_internal(file, dev, args);
37 static irqreturn_t komeda_kms_irq_handler(int irq, void *data)
39 struct drm_device *drm = data;
40 struct komeda_dev *mdev = drm->dev_private;
41 struct komeda_kms_dev *kms = to_kdev(drm);
42 struct komeda_events evts;
46 /* Call into the CHIP to recognize events */
47 memset(&evts, 0, sizeof(evts));
48 status = mdev->funcs->irq_handler(mdev, &evts);
50 /* Notify the crtc to handle the events */
51 for (i = 0; i < kms->n_crtcs; i++)
52 komeda_crtc_handle_event(&kms->crtcs[i], &evts);
57 static struct drm_driver komeda_kms_driver = {
58 .driver_features = DRIVER_GEM | DRIVER_MODESET | DRIVER_ATOMIC |
59 DRIVER_PRIME | DRIVER_HAVE_IRQ,
60 .lastclose = drm_fb_helper_lastclose,
61 .irq_handler = komeda_kms_irq_handler,
62 .gem_free_object_unlocked = drm_gem_cma_free_object,
63 .gem_vm_ops = &drm_gem_cma_vm_ops,
64 .dumb_create = komeda_gem_cma_dumb_create,
65 .prime_handle_to_fd = drm_gem_prime_handle_to_fd,
66 .prime_fd_to_handle = drm_gem_prime_fd_to_handle,
67 .gem_prime_export = drm_gem_prime_export,
68 .gem_prime_import = drm_gem_prime_import,
69 .gem_prime_get_sg_table = drm_gem_cma_prime_get_sg_table,
70 .gem_prime_import_sg_table = drm_gem_cma_prime_import_sg_table,
71 .gem_prime_vmap = drm_gem_cma_prime_vmap,
72 .gem_prime_vunmap = drm_gem_cma_prime_vunmap,
73 .gem_prime_mmap = drm_gem_cma_prime_mmap,
74 .fops = &komeda_cma_fops,
76 .desc = "Arm Komeda Display Processor driver",
82 static void komeda_kms_commit_tail(struct drm_atomic_state *old_state)
84 struct drm_device *dev = old_state->dev;
86 drm_atomic_helper_commit_modeset_disables(dev, old_state);
88 drm_atomic_helper_commit_planes(dev, old_state, 0);
90 drm_atomic_helper_commit_modeset_enables(dev, old_state);
92 drm_atomic_helper_wait_for_flip_done(dev, old_state);
94 drm_atomic_helper_commit_hw_done(old_state);
96 drm_atomic_helper_cleanup_planes(dev, old_state);
99 static const struct drm_mode_config_helper_funcs komeda_mode_config_helpers = {
100 .atomic_commit_tail = komeda_kms_commit_tail,
103 static int komeda_kms_check(struct drm_device *dev,
104 struct drm_atomic_state *state)
106 struct drm_crtc *crtc;
107 struct drm_crtc_state *old_crtc_st, *new_crtc_st;
110 err = drm_atomic_helper_check_modeset(dev, state);
114 /* komeda need to re-calculate resource assumption in every commit
115 * so need to add all affected_planes (even unchanged) to
118 for_each_oldnew_crtc_in_state(state, crtc, old_crtc_st, new_crtc_st, i) {
119 err = drm_atomic_add_affected_planes(state, crtc);
124 err = drm_atomic_helper_check_planes(dev, state);
131 static const struct drm_mode_config_funcs komeda_mode_config_funcs = {
132 .fb_create = komeda_fb_create,
133 .atomic_check = komeda_kms_check,
134 .atomic_commit = drm_atomic_helper_commit,
137 static void komeda_kms_mode_config_init(struct komeda_kms_dev *kms,
138 struct komeda_dev *mdev)
140 struct drm_mode_config *config = &kms->base.mode_config;
142 drm_mode_config_init(&kms->base);
144 komeda_kms_setup_crtcs(kms, mdev);
146 /* Get value from dev */
147 config->min_width = 0;
148 config->min_height = 0;
149 config->max_width = 4096;
150 config->max_height = 4096;
151 config->allow_fb_modifiers = false;
153 config->funcs = &komeda_mode_config_funcs;
154 config->helper_private = &komeda_mode_config_helpers;
157 struct komeda_kms_dev *komeda_kms_attach(struct komeda_dev *mdev)
159 struct komeda_kms_dev *kms = kzalloc(sizeof(*kms), GFP_KERNEL);
160 struct drm_device *drm;
164 return ERR_PTR(-ENOMEM);
167 err = drm_dev_init(drm, &komeda_kms_driver, mdev->dev);
171 drm->dev_private = mdev;
173 komeda_kms_mode_config_init(kms, mdev);
175 err = komeda_kms_add_private_objs(kms, mdev);
177 goto cleanup_mode_config;
179 err = komeda_kms_add_planes(kms, mdev);
181 goto cleanup_mode_config;
183 err = drm_vblank_init(drm, kms->n_crtcs);
185 goto cleanup_mode_config;
187 err = komeda_kms_add_crtcs(kms, mdev);
189 goto cleanup_mode_config;
191 err = component_bind_all(mdev->dev, kms);
193 goto cleanup_mode_config;
195 drm_mode_config_reset(drm);
197 err = drm_irq_install(drm, mdev->irq);
199 goto cleanup_mode_config;
201 err = mdev->funcs->enable_irq(mdev);
205 err = drm_dev_register(drm, 0);
212 drm_irq_uninstall(drm);
214 drm_mode_config_cleanup(drm);
215 komeda_kms_cleanup_private_objs(kms);
221 void komeda_kms_detach(struct komeda_kms_dev *kms)
223 struct drm_device *drm = &kms->base;
224 struct komeda_dev *mdev = drm->dev_private;
226 mdev->funcs->disable_irq(mdev);
227 drm_dev_unregister(drm);
228 drm_irq_uninstall(drm);
229 component_unbind_all(mdev->dev, drm);
230 komeda_kms_cleanup_private_objs(kms);
231 drm_mode_config_cleanup(drm);
232 drm->dev_private = NULL;