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