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0d4bbaf9 RC |
1 | /* |
2 | * Copyright (C) 2012 Texas Instruments | |
3 | * Author: Rob Clark <robdclark@gmail.com> | |
4 | * | |
5 | * This program is free software; you can redistribute it and/or modify it | |
6 | * under the terms of the GNU General Public License version 2 as published by | |
7 | * the Free Software Foundation. | |
8 | * | |
9 | * This program is distributed in the hope that it will be useful, but WITHOUT | |
10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for | |
12 | * more details. | |
13 | * | |
14 | * You should have received a copy of the GNU General Public License along with | |
15 | * this program. If not, see <http://www.gnu.org/licenses/>. | |
16 | */ | |
17 | ||
18 | #include <linux/pinctrl/pinmux.h> | |
19 | #include <linux/pinctrl/consumer.h> | |
20 | #include <linux/backlight.h> | |
d898ce03 | 21 | #include <linux/gpio/consumer.h> |
0d4bbaf9 RC |
22 | #include <video/display_timing.h> |
23 | #include <video/of_display_timing.h> | |
24 | #include <video/videomode.h> | |
0f65d89b | 25 | #include <drm/drm_atomic_helper.h> |
0d4bbaf9 RC |
26 | |
27 | #include "tilcdc_drv.h" | |
28 | ||
29 | struct panel_module { | |
30 | struct tilcdc_module base; | |
31 | struct tilcdc_panel_info *info; | |
32 | struct display_timings *timings; | |
33 | struct backlight_device *backlight; | |
d898ce03 | 34 | struct gpio_desc *enable_gpio; |
0d4bbaf9 RC |
35 | }; |
36 | #define to_panel_module(x) container_of(x, struct panel_module, base) | |
37 | ||
38 | ||
39 | /* | |
40 | * Encoder: | |
41 | */ | |
42 | ||
43 | struct panel_encoder { | |
44 | struct drm_encoder base; | |
45 | struct panel_module *mod; | |
46 | }; | |
47 | #define to_panel_encoder(x) container_of(x, struct panel_encoder, base) | |
48 | ||
0d4bbaf9 RC |
49 | static void panel_encoder_dpms(struct drm_encoder *encoder, int mode) |
50 | { | |
51 | struct panel_encoder *panel_encoder = to_panel_encoder(encoder); | |
52 | struct backlight_device *backlight = panel_encoder->mod->backlight; | |
d898ce03 | 53 | struct gpio_desc *gpio = panel_encoder->mod->enable_gpio; |
0d4bbaf9 | 54 | |
d898ce03 EG |
55 | if (backlight) { |
56 | backlight->props.power = mode == DRM_MODE_DPMS_ON ? | |
57 | FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN; | |
58 | backlight_update_status(backlight); | |
59 | } | |
0d4bbaf9 | 60 | |
d898ce03 EG |
61 | if (gpio) |
62 | gpiod_set_value_cansleep(gpio, | |
63 | mode == DRM_MODE_DPMS_ON ? 1 : 0); | |
0d4bbaf9 RC |
64 | } |
65 | ||
0d4bbaf9 RC |
66 | static void panel_encoder_prepare(struct drm_encoder *encoder) |
67 | { | |
0d4bbaf9 | 68 | panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF); |
0d4bbaf9 RC |
69 | } |
70 | ||
71 | static void panel_encoder_commit(struct drm_encoder *encoder) | |
72 | { | |
73 | panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON); | |
74 | } | |
75 | ||
76 | static void panel_encoder_mode_set(struct drm_encoder *encoder, | |
77 | struct drm_display_mode *mode, | |
78 | struct drm_display_mode *adjusted_mode) | |
79 | { | |
80 | /* nothing needed */ | |
81 | } | |
82 | ||
83 | static const struct drm_encoder_funcs panel_encoder_funcs = { | |
d0ec32ca | 84 | .destroy = drm_encoder_cleanup, |
0d4bbaf9 RC |
85 | }; |
86 | ||
87 | static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = { | |
88 | .dpms = panel_encoder_dpms, | |
0d4bbaf9 RC |
89 | .prepare = panel_encoder_prepare, |
90 | .commit = panel_encoder_commit, | |
91 | .mode_set = panel_encoder_mode_set, | |
92 | }; | |
93 | ||
94 | static struct drm_encoder *panel_encoder_create(struct drm_device *dev, | |
95 | struct panel_module *mod) | |
96 | { | |
97 | struct panel_encoder *panel_encoder; | |
98 | struct drm_encoder *encoder; | |
99 | int ret; | |
100 | ||
d0ec32ca JS |
101 | panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder), |
102 | GFP_KERNEL); | |
0d4bbaf9 RC |
103 | if (!panel_encoder) { |
104 | dev_err(dev->dev, "allocation failed\n"); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | panel_encoder->mod = mod; | |
109 | ||
110 | encoder = &panel_encoder->base; | |
111 | encoder->possible_crtcs = 1; | |
112 | ||
113 | ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs, | |
13a3d91f | 114 | DRM_MODE_ENCODER_LVDS, NULL); |
0d4bbaf9 RC |
115 | if (ret < 0) |
116 | goto fail; | |
117 | ||
118 | drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs); | |
119 | ||
120 | return encoder; | |
121 | ||
122 | fail: | |
d0ec32ca | 123 | drm_encoder_cleanup(encoder); |
0d4bbaf9 RC |
124 | return NULL; |
125 | } | |
126 | ||
127 | /* | |
128 | * Connector: | |
129 | */ | |
130 | ||
131 | struct panel_connector { | |
132 | struct drm_connector base; | |
133 | ||
134 | struct drm_encoder *encoder; /* our connected encoder */ | |
135 | struct panel_module *mod; | |
136 | }; | |
137 | #define to_panel_connector(x) container_of(x, struct panel_connector, base) | |
138 | ||
139 | ||
140 | static void panel_connector_destroy(struct drm_connector *connector) | |
141 | { | |
62eb3e20 | 142 | drm_connector_unregister(connector); |
0d4bbaf9 | 143 | drm_connector_cleanup(connector); |
0d4bbaf9 RC |
144 | } |
145 | ||
146 | static enum drm_connector_status panel_connector_detect( | |
147 | struct drm_connector *connector, | |
148 | bool force) | |
149 | { | |
150 | return connector_status_connected; | |
151 | } | |
152 | ||
153 | static int panel_connector_get_modes(struct drm_connector *connector) | |
154 | { | |
155 | struct drm_device *dev = connector->dev; | |
156 | struct panel_connector *panel_connector = to_panel_connector(connector); | |
157 | struct display_timings *timings = panel_connector->mod->timings; | |
158 | int i; | |
159 | ||
160 | for (i = 0; i < timings->num_timings; i++) { | |
161 | struct drm_display_mode *mode = drm_mode_create(dev); | |
162 | struct videomode vm; | |
163 | ||
6cd2c7db | 164 | if (videomode_from_timings(timings, &vm, i)) |
0d4bbaf9 RC |
165 | break; |
166 | ||
167 | drm_display_mode_from_videomode(&vm, mode); | |
168 | ||
169 | mode->type = DRM_MODE_TYPE_DRIVER; | |
170 | ||
171 | if (timings->native_mode == i) | |
172 | mode->type |= DRM_MODE_TYPE_PREFERRED; | |
173 | ||
174 | drm_mode_set_name(mode); | |
175 | drm_mode_probed_add(connector, mode); | |
176 | } | |
177 | ||
178 | return i; | |
179 | } | |
180 | ||
181 | static int panel_connector_mode_valid(struct drm_connector *connector, | |
182 | struct drm_display_mode *mode) | |
183 | { | |
184 | struct tilcdc_drm_private *priv = connector->dev->dev_private; | |
185 | /* our only constraints are what the crtc can generate: */ | |
186 | return tilcdc_crtc_mode_valid(priv->crtc, mode); | |
187 | } | |
188 | ||
189 | static struct drm_encoder *panel_connector_best_encoder( | |
190 | struct drm_connector *connector) | |
191 | { | |
192 | struct panel_connector *panel_connector = to_panel_connector(connector); | |
193 | return panel_connector->encoder; | |
194 | } | |
195 | ||
196 | static const struct drm_connector_funcs panel_connector_funcs = { | |
197 | .destroy = panel_connector_destroy, | |
0f65d89b | 198 | .dpms = drm_atomic_helper_connector_dpms, |
0d4bbaf9 RC |
199 | .detect = panel_connector_detect, |
200 | .fill_modes = drm_helper_probe_single_connector_modes, | |
0f65d89b JS |
201 | .reset = drm_atomic_helper_connector_reset, |
202 | .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state, | |
203 | .atomic_destroy_state = drm_atomic_helper_connector_destroy_state, | |
0d4bbaf9 RC |
204 | }; |
205 | ||
206 | static const struct drm_connector_helper_funcs panel_connector_helper_funcs = { | |
207 | .get_modes = panel_connector_get_modes, | |
208 | .mode_valid = panel_connector_mode_valid, | |
209 | .best_encoder = panel_connector_best_encoder, | |
210 | }; | |
211 | ||
212 | static struct drm_connector *panel_connector_create(struct drm_device *dev, | |
213 | struct panel_module *mod, struct drm_encoder *encoder) | |
214 | { | |
215 | struct panel_connector *panel_connector; | |
216 | struct drm_connector *connector; | |
217 | int ret; | |
218 | ||
d0ec32ca JS |
219 | panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector), |
220 | GFP_KERNEL); | |
0d4bbaf9 RC |
221 | if (!panel_connector) { |
222 | dev_err(dev->dev, "allocation failed\n"); | |
223 | return NULL; | |
224 | } | |
225 | ||
226 | panel_connector->encoder = encoder; | |
227 | panel_connector->mod = mod; | |
228 | ||
229 | connector = &panel_connector->base; | |
230 | ||
231 | drm_connector_init(dev, connector, &panel_connector_funcs, | |
232 | DRM_MODE_CONNECTOR_LVDS); | |
233 | drm_connector_helper_add(connector, &panel_connector_helper_funcs); | |
234 | ||
235 | connector->interlace_allowed = 0; | |
236 | connector->doublescan_allowed = 0; | |
237 | ||
238 | ret = drm_mode_connector_attach_encoder(connector, encoder); | |
239 | if (ret) | |
240 | goto fail; | |
241 | ||
34ea3d38 | 242 | drm_connector_register(connector); |
0d4bbaf9 RC |
243 | |
244 | return connector; | |
245 | ||
246 | fail: | |
247 | panel_connector_destroy(connector); | |
248 | return NULL; | |
249 | } | |
250 | ||
251 | /* | |
252 | * Module: | |
253 | */ | |
254 | ||
255 | static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev) | |
256 | { | |
257 | struct panel_module *panel_mod = to_panel_module(mod); | |
258 | struct tilcdc_drm_private *priv = dev->dev_private; | |
259 | struct drm_encoder *encoder; | |
260 | struct drm_connector *connector; | |
261 | ||
262 | encoder = panel_encoder_create(dev, panel_mod); | |
263 | if (!encoder) | |
264 | return -ENOMEM; | |
265 | ||
266 | connector = panel_connector_create(dev, panel_mod, encoder); | |
267 | if (!connector) | |
268 | return -ENOMEM; | |
269 | ||
270 | priv->encoders[priv->num_encoders++] = encoder; | |
271 | priv->connectors[priv->num_connectors++] = connector; | |
272 | ||
ee6de21b JS |
273 | tilcdc_crtc_set_panel_info(priv->crtc, |
274 | to_panel_encoder(encoder)->mod->info); | |
275 | ||
0d4bbaf9 RC |
276 | return 0; |
277 | } | |
278 | ||
0d4bbaf9 RC |
279 | static const struct tilcdc_module_ops panel_module_ops = { |
280 | .modeset_init = panel_modeset_init, | |
0d4bbaf9 RC |
281 | }; |
282 | ||
283 | /* | |
284 | * Device: | |
285 | */ | |
286 | ||
287 | /* maybe move this somewhere common if it is needed by other outputs? */ | |
1733d010 | 288 | static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np) |
0d4bbaf9 RC |
289 | { |
290 | struct device_node *info_np; | |
291 | struct tilcdc_panel_info *info; | |
292 | int ret = 0; | |
293 | ||
294 | if (!np) { | |
295 | pr_err("%s: no devicenode given\n", __func__); | |
296 | return NULL; | |
297 | } | |
298 | ||
299 | info_np = of_get_child_by_name(np, "panel-info"); | |
300 | if (!info_np) { | |
301 | pr_err("%s: could not find panel-info node\n", __func__); | |
302 | return NULL; | |
303 | } | |
304 | ||
305 | info = kzalloc(sizeof(*info), GFP_KERNEL); | |
306 | if (!info) { | |
307 | pr_err("%s: allocation failed\n", __func__); | |
9430dfa6 | 308 | of_node_put(info_np); |
0d4bbaf9 RC |
309 | return NULL; |
310 | } | |
311 | ||
312 | ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias); | |
313 | ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt); | |
314 | ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz); | |
315 | ret |= of_property_read_u32(info_np, "bpp", &info->bpp); | |
316 | ret |= of_property_read_u32(info_np, "fdd", &info->fdd); | |
317 | ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge); | |
318 | ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl); | |
319 | ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order); | |
320 | ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th); | |
321 | ||
322 | /* optional: */ | |
323 | info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode"); | |
324 | info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk"); | |
325 | ||
326 | if (ret) { | |
327 | pr_err("%s: error reading panel-info properties\n", __func__); | |
328 | kfree(info); | |
9430dfa6 | 329 | of_node_put(info_np); |
0d4bbaf9 RC |
330 | return NULL; |
331 | } | |
9430dfa6 | 332 | of_node_put(info_np); |
0d4bbaf9 RC |
333 | |
334 | return info; | |
335 | } | |
336 | ||
0d4bbaf9 RC |
337 | static int panel_probe(struct platform_device *pdev) |
338 | { | |
18c44db8 | 339 | struct device_node *bl_node, *node = pdev->dev.of_node; |
0d4bbaf9 RC |
340 | struct panel_module *panel_mod; |
341 | struct tilcdc_module *mod; | |
342 | struct pinctrl *pinctrl; | |
12778fc1 | 343 | int ret; |
0d4bbaf9 | 344 | |
0d4bbaf9 RC |
345 | /* bail out early if no DT data: */ |
346 | if (!node) { | |
347 | dev_err(&pdev->dev, "device-tree data is missing\n"); | |
348 | return -ENXIO; | |
349 | } | |
350 | ||
971645d1 | 351 | panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL); |
0d4bbaf9 RC |
352 | if (!panel_mod) |
353 | return -ENOMEM; | |
354 | ||
18c44db8 EG |
355 | bl_node = of_parse_phandle(node, "backlight", 0); |
356 | if (bl_node) { | |
357 | panel_mod->backlight = of_find_backlight_by_node(bl_node); | |
358 | of_node_put(bl_node); | |
359 | ||
360 | if (!panel_mod->backlight) | |
361 | return -EPROBE_DEFER; | |
362 | ||
363 | dev_info(&pdev->dev, "found backlight\n"); | |
364 | } | |
365 | ||
26a5bd26 UKK |
366 | panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable", |
367 | GPIOD_OUT_LOW); | |
d898ce03 EG |
368 | if (IS_ERR(panel_mod->enable_gpio)) { |
369 | ret = PTR_ERR(panel_mod->enable_gpio); | |
26a5bd26 UKK |
370 | dev_err(&pdev->dev, "failed to request enable GPIO\n"); |
371 | goto fail_backlight; | |
d898ce03 EG |
372 | } |
373 | ||
26a5bd26 UKK |
374 | if (panel_mod->enable_gpio) |
375 | dev_info(&pdev->dev, "found enable GPIO\n"); | |
376 | ||
0d4bbaf9 | 377 | mod = &panel_mod->base; |
7cdcce9f | 378 | pdev->dev.platform_data = mod; |
0d4bbaf9 RC |
379 | |
380 | tilcdc_module_init(mod, "panel", &panel_module_ops); | |
381 | ||
382 | pinctrl = devm_pinctrl_get_select_default(&pdev->dev); | |
383 | if (IS_ERR(pinctrl)) | |
384 | dev_warn(&pdev->dev, "pins are not configured\n"); | |
385 | ||
0d4bbaf9 RC |
386 | panel_mod->timings = of_get_display_timings(node); |
387 | if (!panel_mod->timings) { | |
388 | dev_err(&pdev->dev, "could not get panel timings\n"); | |
12778fc1 | 389 | ret = -EINVAL; |
7cdcce9f | 390 | goto fail_free; |
0d4bbaf9 RC |
391 | } |
392 | ||
393 | panel_mod->info = of_get_panel_info(node); | |
394 | if (!panel_mod->info) { | |
395 | dev_err(&pdev->dev, "could not get panel info\n"); | |
12778fc1 | 396 | ret = -EINVAL; |
7cdcce9f | 397 | goto fail_timings; |
0d4bbaf9 RC |
398 | } |
399 | ||
0d4bbaf9 RC |
400 | return 0; |
401 | ||
7cdcce9f GM |
402 | fail_timings: |
403 | display_timings_release(panel_mod->timings); | |
404 | ||
405 | fail_free: | |
7cdcce9f | 406 | tilcdc_module_cleanup(mod); |
d898ce03 EG |
407 | |
408 | fail_backlight: | |
18c44db8 EG |
409 | if (panel_mod->backlight) |
410 | put_device(&panel_mod->backlight->dev); | |
0d4bbaf9 RC |
411 | return ret; |
412 | } | |
413 | ||
414 | static int panel_remove(struct platform_device *pdev) | |
415 | { | |
7cdcce9f GM |
416 | struct tilcdc_module *mod = dev_get_platdata(&pdev->dev); |
417 | struct panel_module *panel_mod = to_panel_module(mod); | |
18c44db8 EG |
418 | struct backlight_device *backlight = panel_mod->backlight; |
419 | ||
420 | if (backlight) | |
421 | put_device(&backlight->dev); | |
7cdcce9f GM |
422 | |
423 | display_timings_release(panel_mod->timings); | |
424 | ||
425 | tilcdc_module_cleanup(mod); | |
426 | kfree(panel_mod->info); | |
7cdcce9f | 427 | |
0d4bbaf9 RC |
428 | return 0; |
429 | } | |
430 | ||
431 | static struct of_device_id panel_of_match[] = { | |
432 | { .compatible = "ti,tilcdc,panel", }, | |
433 | { }, | |
434 | }; | |
0d4bbaf9 RC |
435 | |
436 | struct platform_driver panel_driver = { | |
437 | .probe = panel_probe, | |
438 | .remove = panel_remove, | |
439 | .driver = { | |
440 | .owner = THIS_MODULE, | |
441 | .name = "panel", | |
442 | .of_match_table = panel_of_match, | |
443 | }, | |
444 | }; | |
445 | ||
446 | int __init tilcdc_panel_init(void) | |
447 | { | |
448 | return platform_driver_register(&panel_driver); | |
449 | } | |
450 | ||
451 | void __exit tilcdc_panel_fini(void) | |
452 | { | |
453 | platform_driver_unregister(&panel_driver); | |
454 | } |