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_vblank.h>
9 #include <linux/platform_device.h>
10 #include <linux/pm_runtime.h>
11
12 #include "dcss-dev.h"
13 #include "dcss-kms.h"
14
dcss_enable_vblank(struct drm_crtc * crtc)15 static int dcss_enable_vblank(struct drm_crtc *crtc)
16 {
17 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
18 base);
19 struct dcss_dev *dcss = crtc->dev->dev_private;
20
21 dcss_dtg_vblank_irq_enable(dcss->dtg, true);
22
23 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
24
25 enable_irq(dcss_crtc->irq);
26
27 return 0;
28 }
29
dcss_disable_vblank(struct drm_crtc * crtc)30 static void dcss_disable_vblank(struct drm_crtc *crtc)
31 {
32 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
33 base);
34 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
35
36 disable_irq_nosync(dcss_crtc->irq);
37
38 dcss_dtg_vblank_irq_enable(dcss->dtg, false);
39
40 if (dcss_crtc->disable_ctxld_kick_irq)
41 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, false);
42 }
43
44 static const struct drm_crtc_funcs dcss_crtc_funcs = {
45 .set_config = drm_atomic_helper_set_config,
46 .destroy = drm_crtc_cleanup,
47 .page_flip = drm_atomic_helper_page_flip,
48 .reset = drm_atomic_helper_crtc_reset,
49 .atomic_duplicate_state = drm_atomic_helper_crtc_duplicate_state,
50 .atomic_destroy_state = drm_atomic_helper_crtc_destroy_state,
51 .enable_vblank = dcss_enable_vblank,
52 .disable_vblank = dcss_disable_vblank,
53 };
54
dcss_crtc_atomic_begin(struct drm_crtc * crtc,struct drm_atomic_state * state)55 static void dcss_crtc_atomic_begin(struct drm_crtc *crtc,
56 struct drm_atomic_state *state)
57 {
58 drm_crtc_vblank_on(crtc);
59 }
60
dcss_crtc_atomic_flush(struct drm_crtc * crtc,struct drm_atomic_state * state)61 static void dcss_crtc_atomic_flush(struct drm_crtc *crtc,
62 struct drm_atomic_state *state)
63 {
64 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
65 base);
66 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
67
68 spin_lock_irq(&crtc->dev->event_lock);
69 if (crtc->state->event) {
70 WARN_ON(drm_crtc_vblank_get(crtc));
71 drm_crtc_arm_vblank_event(crtc, crtc->state->event);
72 crtc->state->event = NULL;
73 }
74 spin_unlock_irq(&crtc->dev->event_lock);
75
76 if (dcss_dtg_is_enabled(dcss->dtg))
77 dcss_ctxld_enable(dcss->ctxld);
78 }
79
dcss_crtc_atomic_enable(struct drm_crtc * crtc,struct drm_atomic_state * state)80 static void dcss_crtc_atomic_enable(struct drm_crtc *crtc,
81 struct drm_atomic_state *state)
82 {
83 struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
84 crtc);
85 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
86 base);
87 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
88 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
89 struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
90 struct videomode vm;
91
92 drm_display_mode_to_videomode(mode, &vm);
93
94 pm_runtime_get_sync(dcss->dev);
95
96 vm.pixelclock = mode->crtc_clock * 1000;
97
98 dcss_ss_subsam_set(dcss->ss);
99 dcss_dtg_css_set(dcss->dtg);
100
101 if (!drm_mode_equal(mode, old_mode) || !old_crtc_state->active) {
102 dcss_dtg_sync_set(dcss->dtg, &vm);
103 dcss_ss_sync_set(dcss->ss, &vm,
104 mode->flags & DRM_MODE_FLAG_PHSYNC,
105 mode->flags & DRM_MODE_FLAG_PVSYNC);
106 }
107
108 dcss_enable_dtg_and_ss(dcss);
109
110 dcss_ctxld_enable(dcss->ctxld);
111
112 /* Allow CTXLD kick interrupt to be disabled when VBLANK is disabled. */
113 dcss_crtc->disable_ctxld_kick_irq = true;
114 }
115
dcss_crtc_atomic_disable(struct drm_crtc * crtc,struct drm_atomic_state * state)116 static void dcss_crtc_atomic_disable(struct drm_crtc *crtc,
117 struct drm_atomic_state *state)
118 {
119 struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
120 crtc);
121 struct dcss_crtc *dcss_crtc = container_of(crtc, struct dcss_crtc,
122 base);
123 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
124 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
125 struct drm_display_mode *old_mode = &old_crtc_state->adjusted_mode;
126
127 drm_atomic_helper_disable_planes_on_crtc(old_crtc_state, false);
128
129 spin_lock_irq(&crtc->dev->event_lock);
130 if (crtc->state->event) {
131 drm_crtc_send_vblank_event(crtc, crtc->state->event);
132 crtc->state->event = NULL;
133 }
134 spin_unlock_irq(&crtc->dev->event_lock);
135
136 dcss_dtg_ctxld_kick_irq_enable(dcss->dtg, true);
137
138 reinit_completion(&dcss->disable_completion);
139
140 dcss_disable_dtg_and_ss(dcss);
141
142 dcss_ctxld_enable(dcss->ctxld);
143
144 if (!drm_mode_equal(mode, old_mode) || !crtc->state->active)
145 if (!wait_for_completion_timeout(&dcss->disable_completion,
146 msecs_to_jiffies(100)))
147 dev_err(dcss->dev, "Shutting off DTG timed out.\n");
148
149 /*
150 * Do not shut off CTXLD kick interrupt when shutting VBLANK off. It
151 * will be needed to commit the last changes, before going to suspend.
152 */
153 dcss_crtc->disable_ctxld_kick_irq = false;
154
155 drm_crtc_vblank_off(crtc);
156
157 pm_runtime_mark_last_busy(dcss->dev);
158 pm_runtime_put_autosuspend(dcss->dev);
159 }
160
161 static const struct drm_crtc_helper_funcs dcss_helper_funcs = {
162 .atomic_begin = dcss_crtc_atomic_begin,
163 .atomic_flush = dcss_crtc_atomic_flush,
164 .atomic_enable = dcss_crtc_atomic_enable,
165 .atomic_disable = dcss_crtc_atomic_disable,
166 };
167
dcss_crtc_irq_handler(int irq,void * dev_id)168 static irqreturn_t dcss_crtc_irq_handler(int irq, void *dev_id)
169 {
170 struct dcss_crtc *dcss_crtc = dev_id;
171 struct dcss_dev *dcss = dcss_crtc->base.dev->dev_private;
172
173 if (!dcss_dtg_vblank_irq_valid(dcss->dtg))
174 return IRQ_NONE;
175
176 if (dcss_ctxld_is_flushed(dcss->ctxld))
177 drm_crtc_handle_vblank(&dcss_crtc->base);
178
179 dcss_dtg_vblank_irq_clear(dcss->dtg);
180
181 return IRQ_HANDLED;
182 }
183
dcss_crtc_init(struct dcss_crtc * crtc,struct drm_device * drm)184 int dcss_crtc_init(struct dcss_crtc *crtc, struct drm_device *drm)
185 {
186 struct dcss_dev *dcss = drm->dev_private;
187 struct platform_device *pdev = to_platform_device(dcss->dev);
188 int ret;
189
190 crtc->plane[0] = dcss_plane_init(drm, drm_crtc_mask(&crtc->base),
191 DRM_PLANE_TYPE_PRIMARY, 0);
192 if (IS_ERR(crtc->plane[0]))
193 return PTR_ERR(crtc->plane[0]);
194
195 crtc->base.port = dcss->of_port;
196
197 drm_crtc_helper_add(&crtc->base, &dcss_helper_funcs);
198 ret = drm_crtc_init_with_planes(drm, &crtc->base, &crtc->plane[0]->base,
199 NULL, &dcss_crtc_funcs, NULL);
200 if (ret) {
201 dev_err(dcss->dev, "failed to init crtc\n");
202 return ret;
203 }
204
205 crtc->irq = platform_get_irq_byname(pdev, "vblank");
206 if (crtc->irq < 0)
207 return crtc->irq;
208
209 ret = request_irq(crtc->irq, dcss_crtc_irq_handler,
210 0, "dcss_drm", crtc);
211 if (ret) {
212 dev_err(dcss->dev, "irq request failed with %d.\n", ret);
213 return ret;
214 }
215
216 disable_irq(crtc->irq);
217
218 return 0;
219 }
220
dcss_crtc_deinit(struct dcss_crtc * crtc,struct drm_device * drm)221 void dcss_crtc_deinit(struct dcss_crtc *crtc, struct drm_device *drm)
222 {
223 free_irq(crtc->irq, crtc);
224 }
225