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1// SPDX-License-Identifier: GPL-2.0+
2/*
3 * i.MX IPUv3 Graphics driver
4 *
5 * Copyright (C) 2011 Sascha Hauer, Pengutronix
6 */
7
8#include <linux/clk.h>
9#include <linux/component.h>
10#include <linux/device.h>
11#include <linux/dma-mapping.h>
12#include <linux/errno.h>
13#include <linux/export.h>
14#include <linux/module.h>
15#include <linux/platform_device.h>
16
17#include <video/imx-ipu-v3.h>
18
19#include <drm/drm_atomic.h>
20#include <drm/drm_atomic_helper.h>
21#include <drm/drm_gem_dma_helper.h>
22#include <drm/drm_managed.h>
23#include <drm/drm_probe_helper.h>
24#include <drm/drm_vblank.h>
25
26#include "imx-drm.h"
27#include "ipuv3-plane.h"
28
29#define DRIVER_DESC "i.MX IPUv3 Graphics"
30
31struct ipu_crtc {
32 struct device *dev;
33 struct drm_crtc base;
34
35 /* plane[0] is the full plane, plane[1] is the partial plane */
36 struct ipu_plane *plane[2];
37
38 struct ipu_dc *dc;
39 struct ipu_di *di;
40 int irq;
41 struct drm_pending_vblank_event *event;
42};
43
44static inline struct ipu_crtc *to_ipu_crtc(struct drm_crtc *crtc)
45{
46 return container_of(crtc, struct ipu_crtc, base);
47}
48
49static void ipu_crtc_atomic_enable(struct drm_crtc *crtc,
50 struct drm_atomic_state *state)
51{
52 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
53 struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
54
55 ipu_prg_enable(ipu);
56 ipu_dc_enable(ipu);
57 ipu_dc_enable_channel(ipu_crtc->dc);
58 ipu_di_enable(ipu_crtc->di);
59}
60
61static void ipu_crtc_disable_planes(struct ipu_crtc *ipu_crtc,
62 struct drm_crtc_state *old_crtc_state)
63{
64 bool disable_partial = false;
65 bool disable_full = false;
66 struct drm_plane *plane;
67
68 drm_atomic_crtc_state_for_each_plane(plane, old_crtc_state) {
69 if (plane == &ipu_crtc->plane[0]->base)
70 disable_full = true;
71 if (ipu_crtc->plane[1] && plane == &ipu_crtc->plane[1]->base)
72 disable_partial = true;
73 }
74
75 if (disable_partial)
76 ipu_plane_disable(ipu_crtc->plane[1], true);
77 if (disable_full)
78 ipu_plane_disable(ipu_crtc->plane[0], true);
79}
80
81static void ipu_crtc_atomic_disable(struct drm_crtc *crtc,
82 struct drm_atomic_state *state)
83{
84 struct drm_crtc_state *old_crtc_state = drm_atomic_get_old_crtc_state(state,
85 crtc);
86 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
87 struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
88
89 ipu_dc_disable_channel(ipu_crtc->dc);
90 ipu_di_disable(ipu_crtc->di);
91 /*
92 * Planes must be disabled before DC clock is removed, as otherwise the
93 * attached IDMACs will be left in undefined state, possibly hanging
94 * the IPU or even system.
95 */
96 ipu_crtc_disable_planes(ipu_crtc, old_crtc_state);
97 ipu_dc_disable(ipu);
98 ipu_prg_disable(ipu);
99
100 drm_crtc_vblank_off(crtc);
101
102 spin_lock_irq(&crtc->dev->event_lock);
103 if (crtc->state->event && !crtc->state->active) {
104 drm_crtc_send_vblank_event(crtc, crtc->state->event);
105 crtc->state->event = NULL;
106 }
107 spin_unlock_irq(&crtc->dev->event_lock);
108}
109
110static void imx_drm_crtc_reset(struct drm_crtc *crtc)
111{
112 struct imx_crtc_state *state;
113
114 if (crtc->state)
115 __drm_atomic_helper_crtc_destroy_state(crtc->state);
116
117 kfree(to_imx_crtc_state(crtc->state));
118 crtc->state = NULL;
119
120 state = kzalloc(sizeof(*state), GFP_KERNEL);
121 if (state)
122 __drm_atomic_helper_crtc_reset(crtc, &state->base);
123}
124
125static struct drm_crtc_state *imx_drm_crtc_duplicate_state(struct drm_crtc *crtc)
126{
127 struct imx_crtc_state *state;
128
129 state = kzalloc(sizeof(*state), GFP_KERNEL);
130 if (!state)
131 return NULL;
132
133 __drm_atomic_helper_crtc_duplicate_state(crtc, &state->base);
134
135 WARN_ON(state->base.crtc != crtc);
136 state->base.crtc = crtc;
137
138 return &state->base;
139}
140
141static void imx_drm_crtc_destroy_state(struct drm_crtc *crtc,
142 struct drm_crtc_state *state)
143{
144 __drm_atomic_helper_crtc_destroy_state(state);
145 kfree(to_imx_crtc_state(state));
146}
147
148static int ipu_enable_vblank(struct drm_crtc *crtc)
149{
150 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
151
152 enable_irq(ipu_crtc->irq);
153
154 return 0;
155}
156
157static void ipu_disable_vblank(struct drm_crtc *crtc)
158{
159 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
160
161 disable_irq_nosync(ipu_crtc->irq);
162}
163
164static const struct drm_crtc_funcs ipu_crtc_funcs = {
165 .set_config = drm_atomic_helper_set_config,
166 .page_flip = drm_atomic_helper_page_flip,
167 .reset = imx_drm_crtc_reset,
168 .atomic_duplicate_state = imx_drm_crtc_duplicate_state,
169 .atomic_destroy_state = imx_drm_crtc_destroy_state,
170 .enable_vblank = ipu_enable_vblank,
171 .disable_vblank = ipu_disable_vblank,
172};
173
174static irqreturn_t ipu_irq_handler(int irq, void *dev_id)
175{
176 struct ipu_crtc *ipu_crtc = dev_id;
177 struct drm_crtc *crtc = &ipu_crtc->base;
178 unsigned long flags;
179 int i;
180
181 drm_crtc_handle_vblank(crtc);
182
183 if (ipu_crtc->event) {
184 for (i = 0; i < ARRAY_SIZE(ipu_crtc->plane); i++) {
185 struct ipu_plane *plane = ipu_crtc->plane[i];
186
187 if (!plane)
188 continue;
189
190 if (ipu_plane_atomic_update_pending(&plane->base))
191 break;
192 }
193
194 if (i == ARRAY_SIZE(ipu_crtc->plane)) {
195 spin_lock_irqsave(&crtc->dev->event_lock, flags);
196 drm_crtc_send_vblank_event(crtc, ipu_crtc->event);
197 ipu_crtc->event = NULL;
198 drm_crtc_vblank_put(crtc);
199 spin_unlock_irqrestore(&crtc->dev->event_lock, flags);
200 }
201 }
202
203 return IRQ_HANDLED;
204}
205
206static bool ipu_crtc_mode_fixup(struct drm_crtc *crtc,
207 const struct drm_display_mode *mode,
208 struct drm_display_mode *adjusted_mode)
209{
210 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
211 struct videomode vm;
212 int ret;
213
214 drm_display_mode_to_videomode(adjusted_mode, &vm);
215
216 ret = ipu_di_adjust_videomode(ipu_crtc->di, &vm);
217 if (ret)
218 return false;
219
220 if ((vm.vsync_len == 0) || (vm.hsync_len == 0))
221 return false;
222
223 drm_display_mode_from_videomode(&vm, adjusted_mode);
224
225 return true;
226}
227
228static int ipu_crtc_atomic_check(struct drm_crtc *crtc,
229 struct drm_atomic_state *state)
230{
231 struct drm_crtc_state *crtc_state = drm_atomic_get_new_crtc_state(state,
232 crtc);
233 u32 primary_plane_mask = drm_plane_mask(crtc->primary);
234
235 if (crtc_state->active && (primary_plane_mask & crtc_state->plane_mask) == 0)
236 return -EINVAL;
237
238 return 0;
239}
240
241static void ipu_crtc_atomic_begin(struct drm_crtc *crtc,
242 struct drm_atomic_state *state)
243{
244 drm_crtc_vblank_on(crtc);
245}
246
247static void ipu_crtc_atomic_flush(struct drm_crtc *crtc,
248 struct drm_atomic_state *state)
249{
250 spin_lock_irq(&crtc->dev->event_lock);
251 if (crtc->state->event) {
252 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
253
254 WARN_ON(drm_crtc_vblank_get(crtc));
255 ipu_crtc->event = crtc->state->event;
256 crtc->state->event = NULL;
257 }
258 spin_unlock_irq(&crtc->dev->event_lock);
259}
260
261static void ipu_crtc_mode_set_nofb(struct drm_crtc *crtc)
262{
263 struct drm_device *dev = crtc->dev;
264 struct drm_encoder *encoder;
265 struct ipu_crtc *ipu_crtc = to_ipu_crtc(crtc);
266 struct drm_display_mode *mode = &crtc->state->adjusted_mode;
267 struct imx_crtc_state *imx_crtc_state = to_imx_crtc_state(crtc->state);
268 struct ipu_di_signal_cfg sig_cfg = {};
269 unsigned long encoder_types = 0;
270
271 dev_dbg(ipu_crtc->dev, "%s: mode->hdisplay: %d\n", __func__,
272 mode->hdisplay);
273 dev_dbg(ipu_crtc->dev, "%s: mode->vdisplay: %d\n", __func__,
274 mode->vdisplay);
275
276 list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
277 if (encoder->crtc == crtc)
278 encoder_types |= BIT(encoder->encoder_type);
279 }
280
281 dev_dbg(ipu_crtc->dev, "%s: attached to encoder types 0x%lx\n",
282 __func__, encoder_types);
283
284 /*
285 * If we have DAC or LDB, then we need the IPU DI clock to be
286 * the same as the LDB DI clock. For TVDAC, derive the IPU DI
287 * clock from 27 MHz TVE_DI clock, but allow to divide it.
288 */
289 if (encoder_types & (BIT(DRM_MODE_ENCODER_DAC) |
290 BIT(DRM_MODE_ENCODER_LVDS)))
291 sig_cfg.clkflags = IPU_DI_CLKMODE_SYNC | IPU_DI_CLKMODE_EXT;
292 else if (encoder_types & BIT(DRM_MODE_ENCODER_TVDAC))
293 sig_cfg.clkflags = IPU_DI_CLKMODE_EXT;
294 else
295 sig_cfg.clkflags = 0;
296
297 sig_cfg.enable_pol = !(imx_crtc_state->bus_flags & DRM_BUS_FLAG_DE_LOW);
298 /* Default to driving pixel data on negative clock edges */
299 sig_cfg.clk_pol = !!(imx_crtc_state->bus_flags &
300 DRM_BUS_FLAG_PIXDATA_DRIVE_POSEDGE);
301 sig_cfg.bus_format = imx_crtc_state->bus_format;
302 sig_cfg.v_to_h_sync = 0;
303 sig_cfg.hsync_pin = imx_crtc_state->di_hsync_pin;
304 sig_cfg.vsync_pin = imx_crtc_state->di_vsync_pin;
305
306 drm_display_mode_to_videomode(mode, &sig_cfg.mode);
307 if (!IS_ALIGNED(sig_cfg.mode.hactive, 8)) {
308 unsigned int new_hactive = ALIGN(sig_cfg.mode.hactive, 8);
309
310 dev_warn(ipu_crtc->dev, "8-pixel align hactive %d -> %d\n",
311 sig_cfg.mode.hactive, new_hactive);
312
313 sig_cfg.mode.hfront_porch = new_hactive - sig_cfg.mode.hactive;
314 sig_cfg.mode.hactive = new_hactive;
315 }
316
317 ipu_dc_init_sync(ipu_crtc->dc, ipu_crtc->di,
318 mode->flags & DRM_MODE_FLAG_INTERLACE,
319 imx_crtc_state->bus_format, sig_cfg.mode.hactive);
320 ipu_di_init_sync_panel(ipu_crtc->di, &sig_cfg);
321}
322
323static const struct drm_crtc_helper_funcs ipu_helper_funcs = {
324 .mode_fixup = ipu_crtc_mode_fixup,
325 .mode_set_nofb = ipu_crtc_mode_set_nofb,
326 .atomic_check = ipu_crtc_atomic_check,
327 .atomic_begin = ipu_crtc_atomic_begin,
328 .atomic_flush = ipu_crtc_atomic_flush,
329 .atomic_disable = ipu_crtc_atomic_disable,
330 .atomic_enable = ipu_crtc_atomic_enable,
331};
332
333static void ipu_put_resources(struct drm_device *dev, void *ptr)
334{
335 struct ipu_crtc *ipu_crtc = ptr;
336
337 if (!IS_ERR_OR_NULL(ipu_crtc->dc))
338 ipu_dc_put(ipu_crtc->dc);
339 if (!IS_ERR_OR_NULL(ipu_crtc->di))
340 ipu_di_put(ipu_crtc->di);
341}
342
343static int ipu_get_resources(struct drm_device *dev, struct ipu_crtc *ipu_crtc,
344 struct ipu_client_platformdata *pdata)
345{
346 struct ipu_soc *ipu = dev_get_drvdata(ipu_crtc->dev->parent);
347 int ret;
348
349 ipu_crtc->dc = ipu_dc_get(ipu, pdata->dc);
350 if (IS_ERR(ipu_crtc->dc))
351 return PTR_ERR(ipu_crtc->dc);
352
353 ret = drmm_add_action_or_reset(dev, ipu_put_resources, ipu_crtc);
354 if (ret)
355 return ret;
356
357 ipu_crtc->di = ipu_di_get(ipu, pdata->di);
358 if (IS_ERR(ipu_crtc->di))
359 return PTR_ERR(ipu_crtc->di);
360
361 return 0;
362}
363
364static int ipu_drm_bind(struct device *dev, struct device *master, void *data)
365{
366 struct ipu_client_platformdata *pdata = dev->platform_data;
367 struct ipu_soc *ipu = dev_get_drvdata(dev->parent);
368 struct drm_device *drm = data;
369 struct ipu_plane *primary_plane;
370 struct ipu_crtc *ipu_crtc;
371 struct drm_crtc *crtc;
372 int dp = -EINVAL;
373 int ret;
374
375 if (pdata->dp >= 0)
376 dp = IPU_DP_FLOW_SYNC_BG;
377 primary_plane = ipu_plane_init(drm, ipu, pdata->dma[0], dp, 0,
378 DRM_PLANE_TYPE_PRIMARY);
379 if (IS_ERR(primary_plane))
380 return PTR_ERR(primary_plane);
381
382 ipu_crtc = drmm_crtc_alloc_with_planes(drm, struct ipu_crtc, base,
383 &primary_plane->base, NULL,
384 &ipu_crtc_funcs, NULL);
385 if (IS_ERR(ipu_crtc))
386 return PTR_ERR(ipu_crtc);
387
388 ipu_crtc->dev = dev;
389 ipu_crtc->plane[0] = primary_plane;
390
391 crtc = &ipu_crtc->base;
392 crtc->port = pdata->of_node;
393 drm_crtc_helper_add(crtc, &ipu_helper_funcs);
394
395 ret = ipu_get_resources(drm, ipu_crtc, pdata);
396 if (ret) {
397 dev_err(ipu_crtc->dev, "getting resources failed with %d.\n",
398 ret);
399 return ret;
400 }
401
402 /* If this crtc is using the DP, add an overlay plane */
403 if (pdata->dp >= 0 && pdata->dma[1] > 0) {
404 ipu_crtc->plane[1] = ipu_plane_init(drm, ipu, pdata->dma[1],
405 IPU_DP_FLOW_SYNC_FG,
406 drm_crtc_mask(&ipu_crtc->base),
407 DRM_PLANE_TYPE_OVERLAY);
408 if (IS_ERR(ipu_crtc->plane[1]))
409 ipu_crtc->plane[1] = NULL;
410 }
411
412 ipu_crtc->irq = ipu_plane_irq(ipu_crtc->plane[0]);
413 ret = devm_request_irq(ipu_crtc->dev, ipu_crtc->irq, ipu_irq_handler, 0,
414 "imx_drm", ipu_crtc);
415 if (ret < 0) {
416 dev_err(ipu_crtc->dev, "irq request failed with %d.\n", ret);
417 return ret;
418 }
419 /* Only enable IRQ when we actually need it to trigger work. */
420 disable_irq(ipu_crtc->irq);
421
422 return 0;
423}
424
425static const struct component_ops ipu_crtc_ops = {
426 .bind = ipu_drm_bind,
427};
428
429static int ipu_drm_probe(struct platform_device *pdev)
430{
431 struct device *dev = &pdev->dev;
432 int ret;
433
434 if (!dev->platform_data)
435 return -EINVAL;
436
437 ret = dma_set_coherent_mask(dev, DMA_BIT_MASK(32));
438 if (ret)
439 return ret;
440
441 return component_add(dev, &ipu_crtc_ops);
442}
443
444static int ipu_drm_remove(struct platform_device *pdev)
445{
446 component_del(&pdev->dev, &ipu_crtc_ops);
447 return 0;
448}
449
450struct platform_driver ipu_drm_driver = {
451 .driver = {
452 .name = "imx-ipuv3-crtc",
453 },
454 .probe = ipu_drm_probe,
455 .remove = ipu_drm_remove,
456};