1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3 * Copyright (C) 2012 Texas Instruments
4 * Author: Rob Clark <robdclark@gmail.com>
5 */
6
7 #include <linux/backlight.h>
8 #include <linux/gpio/consumer.h>
9 #include <linux/pinctrl/consumer.h>
10 #include <linux/platform_device.h>
11
12 #include <video/display_timing.h>
13 #include <video/of_display_timing.h>
14 #include <video/videomode.h>
15
16 #include <drm/drm_atomic_state_helper.h>
17 #include <drm/drm_connector.h>
18 #include <drm/drm_modeset_helper_vtables.h>
19 #include <drm/drm_probe_helper.h>
20 #include <drm/drm_simple_kms_helper.h>
21
22 #include "tilcdc_drv.h"
23 #include "tilcdc_panel.h"
24
25 struct panel_module {
26 struct tilcdc_module base;
27 struct tilcdc_panel_info *info;
28 struct display_timings *timings;
29 struct backlight_device *backlight;
30 struct gpio_desc *enable_gpio;
31 };
32 #define to_panel_module(x) container_of(x, struct panel_module, base)
33
34
35 /*
36 * Encoder:
37 */
38
39 struct panel_encoder {
40 struct drm_encoder base;
41 struct panel_module *mod;
42 };
43 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
44
panel_encoder_dpms(struct drm_encoder * encoder,int mode)45 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
46 {
47 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
48 struct backlight_device *backlight = panel_encoder->mod->backlight;
49 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
50
51 if (backlight) {
52 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
53 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
54 backlight_update_status(backlight);
55 }
56
57 if (gpio)
58 gpiod_set_value_cansleep(gpio,
59 mode == DRM_MODE_DPMS_ON ? 1 : 0);
60 }
61
panel_encoder_prepare(struct drm_encoder * encoder)62 static void panel_encoder_prepare(struct drm_encoder *encoder)
63 {
64 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
65 }
66
panel_encoder_commit(struct drm_encoder * encoder)67 static void panel_encoder_commit(struct drm_encoder *encoder)
68 {
69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
70 }
71
panel_encoder_mode_set(struct drm_encoder * encoder,struct drm_display_mode * mode,struct drm_display_mode * adjusted_mode)72 static void panel_encoder_mode_set(struct drm_encoder *encoder,
73 struct drm_display_mode *mode,
74 struct drm_display_mode *adjusted_mode)
75 {
76 /* nothing needed */
77 }
78
79 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
80 .dpms = panel_encoder_dpms,
81 .prepare = panel_encoder_prepare,
82 .commit = panel_encoder_commit,
83 .mode_set = panel_encoder_mode_set,
84 };
85
panel_encoder_create(struct drm_device * dev,struct panel_module * mod)86 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
87 struct panel_module *mod)
88 {
89 struct panel_encoder *panel_encoder;
90 struct drm_encoder *encoder;
91 int ret;
92
93 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
94 GFP_KERNEL);
95 if (!panel_encoder)
96 return NULL;
97
98 panel_encoder->mod = mod;
99
100 encoder = &panel_encoder->base;
101 encoder->possible_crtcs = 1;
102
103 ret = drm_simple_encoder_init(dev, encoder, DRM_MODE_ENCODER_LVDS);
104 if (ret < 0)
105 goto fail;
106
107 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
108
109 return encoder;
110
111 fail:
112 drm_encoder_cleanup(encoder);
113 return NULL;
114 }
115
116 /*
117 * Connector:
118 */
119
120 struct panel_connector {
121 struct drm_connector base;
122
123 struct drm_encoder *encoder; /* our connected encoder */
124 struct panel_module *mod;
125 };
126 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
127
128
panel_connector_destroy(struct drm_connector * connector)129 static void panel_connector_destroy(struct drm_connector *connector)
130 {
131 drm_connector_unregister(connector);
132 drm_connector_cleanup(connector);
133 }
134
panel_connector_get_modes(struct drm_connector * connector)135 static int panel_connector_get_modes(struct drm_connector *connector)
136 {
137 struct drm_device *dev = connector->dev;
138 struct panel_connector *panel_connector = to_panel_connector(connector);
139 struct display_timings *timings = panel_connector->mod->timings;
140 int i;
141
142 for (i = 0; i < timings->num_timings; i++) {
143 struct drm_display_mode *mode;
144 struct videomode vm;
145
146 if (videomode_from_timings(timings, &vm, i))
147 break;
148
149 mode = drm_mode_create(dev);
150 if (!mode)
151 break;
152
153 drm_display_mode_from_videomode(&vm, mode);
154
155 mode->type = DRM_MODE_TYPE_DRIVER;
156
157 if (timings->native_mode == i)
158 mode->type |= DRM_MODE_TYPE_PREFERRED;
159
160 drm_mode_set_name(mode);
161 drm_mode_probed_add(connector, mode);
162 }
163
164 return i;
165 }
166
panel_connector_best_encoder(struct drm_connector * connector)167 static struct drm_encoder *panel_connector_best_encoder(
168 struct drm_connector *connector)
169 {
170 struct panel_connector *panel_connector = to_panel_connector(connector);
171 return panel_connector->encoder;
172 }
173
174 static const struct drm_connector_funcs panel_connector_funcs = {
175 .destroy = panel_connector_destroy,
176 .fill_modes = drm_helper_probe_single_connector_modes,
177 .reset = drm_atomic_helper_connector_reset,
178 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
179 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
180 };
181
182 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
183 .get_modes = panel_connector_get_modes,
184 .best_encoder = panel_connector_best_encoder,
185 };
186
panel_connector_create(struct drm_device * dev,struct panel_module * mod,struct drm_encoder * encoder)187 static struct drm_connector *panel_connector_create(struct drm_device *dev,
188 struct panel_module *mod, struct drm_encoder *encoder)
189 {
190 struct panel_connector *panel_connector;
191 struct drm_connector *connector;
192 int ret;
193
194 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
195 GFP_KERNEL);
196 if (!panel_connector)
197 return NULL;
198
199 panel_connector->encoder = encoder;
200 panel_connector->mod = mod;
201
202 connector = &panel_connector->base;
203
204 drm_connector_init(dev, connector, &panel_connector_funcs,
205 DRM_MODE_CONNECTOR_LVDS);
206 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
207
208 connector->interlace_allowed = 0;
209 connector->doublescan_allowed = 0;
210
211 ret = drm_connector_attach_encoder(connector, encoder);
212 if (ret)
213 goto fail;
214
215 return connector;
216
217 fail:
218 panel_connector_destroy(connector);
219 return NULL;
220 }
221
222 /*
223 * Module:
224 */
225
panel_modeset_init(struct tilcdc_module * mod,struct drm_device * dev)226 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
227 {
228 struct panel_module *panel_mod = to_panel_module(mod);
229 struct tilcdc_drm_private *priv = dev->dev_private;
230 struct drm_encoder *encoder;
231 struct drm_connector *connector;
232
233 encoder = panel_encoder_create(dev, panel_mod);
234 if (!encoder)
235 return -ENOMEM;
236
237 connector = panel_connector_create(dev, panel_mod, encoder);
238 if (!connector)
239 return -ENOMEM;
240
241 priv->encoders[priv->num_encoders++] = encoder;
242 priv->connectors[priv->num_connectors++] = connector;
243
244 tilcdc_crtc_set_panel_info(priv->crtc,
245 to_panel_encoder(encoder)->mod->info);
246
247 return 0;
248 }
249
250 static const struct tilcdc_module_ops panel_module_ops = {
251 .modeset_init = panel_modeset_init,
252 };
253
254 /*
255 * Device:
256 */
257
258 /* maybe move this somewhere common if it is needed by other outputs? */
of_get_panel_info(struct device_node * np)259 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
260 {
261 struct device_node *info_np;
262 struct tilcdc_panel_info *info;
263 int ret = 0;
264
265 if (!np) {
266 pr_err("%s: no devicenode given\n", __func__);
267 return NULL;
268 }
269
270 info_np = of_get_child_by_name(np, "panel-info");
271 if (!info_np) {
272 pr_err("%s: could not find panel-info node\n", __func__);
273 return NULL;
274 }
275
276 info = kzalloc(sizeof(*info), GFP_KERNEL);
277 if (!info)
278 goto put_node;
279
280 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
281 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
282 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
283 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
284 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
285 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
286 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
287 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
288 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
289
290 /* optional: */
291 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
292 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
293
294 if (ret) {
295 pr_err("%s: error reading panel-info properties\n", __func__);
296 kfree(info);
297 info = NULL;
298 }
299
300 put_node:
301 of_node_put(info_np);
302 return info;
303 }
304
panel_probe(struct platform_device * pdev)305 static int panel_probe(struct platform_device *pdev)
306 {
307 struct device_node *node = pdev->dev.of_node;
308 struct backlight_device *backlight;
309 struct panel_module *panel_mod;
310 struct tilcdc_module *mod;
311 struct pinctrl *pinctrl;
312 int ret;
313
314 /* bail out early if no DT data: */
315 if (!node) {
316 dev_err(&pdev->dev, "device-tree data is missing\n");
317 return -ENXIO;
318 }
319
320 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
321 if (!panel_mod)
322 return -ENOMEM;
323
324 backlight = devm_of_find_backlight(&pdev->dev);
325 if (IS_ERR(backlight))
326 return PTR_ERR(backlight);
327 panel_mod->backlight = backlight;
328
329 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
330 GPIOD_OUT_LOW);
331 if (IS_ERR(panel_mod->enable_gpio)) {
332 ret = PTR_ERR(panel_mod->enable_gpio);
333 dev_err(&pdev->dev, "failed to request enable GPIO\n");
334 goto fail_backlight;
335 }
336
337 if (panel_mod->enable_gpio)
338 dev_info(&pdev->dev, "found enable GPIO\n");
339
340 mod = &panel_mod->base;
341 pdev->dev.platform_data = mod;
342
343 tilcdc_module_init(mod, "panel", &panel_module_ops);
344
345 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
346 if (IS_ERR(pinctrl))
347 dev_warn(&pdev->dev, "pins are not configured\n");
348
349 panel_mod->timings = of_get_display_timings(node);
350 if (!panel_mod->timings) {
351 dev_err(&pdev->dev, "could not get panel timings\n");
352 ret = -EINVAL;
353 goto fail_free;
354 }
355
356 panel_mod->info = of_get_panel_info(node);
357 if (!panel_mod->info) {
358 dev_err(&pdev->dev, "could not get panel info\n");
359 ret = -EINVAL;
360 goto fail_timings;
361 }
362
363 return 0;
364
365 fail_timings:
366 display_timings_release(panel_mod->timings);
367
368 fail_free:
369 tilcdc_module_cleanup(mod);
370
371 fail_backlight:
372 if (panel_mod->backlight)
373 put_device(&panel_mod->backlight->dev);
374 return ret;
375 }
376
panel_remove(struct platform_device * pdev)377 static void panel_remove(struct platform_device *pdev)
378 {
379 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
380 struct panel_module *panel_mod = to_panel_module(mod);
381 struct backlight_device *backlight = panel_mod->backlight;
382
383 if (backlight)
384 put_device(&backlight->dev);
385
386 display_timings_release(panel_mod->timings);
387
388 tilcdc_module_cleanup(mod);
389 kfree(panel_mod->info);
390 }
391
392 static const struct of_device_id panel_of_match[] = {
393 { .compatible = "ti,tilcdc,panel", },
394 { },
395 };
396
397 static struct platform_driver panel_driver = {
398 .probe = panel_probe,
399 .remove_new = panel_remove,
400 .driver = {
401 .name = "tilcdc-panel",
402 .of_match_table = panel_of_match,
403 },
404 };
405
tilcdc_panel_init(void)406 int __init tilcdc_panel_init(void)
407 {
408 return platform_driver_register(&panel_driver);
409 }
410
tilcdc_panel_fini(void)411 void __exit tilcdc_panel_fini(void)
412 {
413 platform_driver_unregister(&panel_driver);
414 }
415