This source file includes following definitions.
- panel_encoder_dpms
- panel_encoder_prepare
- panel_encoder_commit
- panel_encoder_mode_set
- panel_encoder_create
- panel_connector_destroy
- panel_connector_get_modes
- panel_connector_best_encoder
- panel_connector_create
- panel_modeset_init
- of_get_panel_info
- panel_probe
- panel_remove
- tilcdc_panel_init
- tilcdc_panel_fini
1
2
3
4
5
6
7 #include <linux/gpio/consumer.h>
8 #include <linux/pinctrl/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
20 #include "tilcdc_drv.h"
21 #include "tilcdc_panel.h"
22
23 struct panel_module {
24 struct tilcdc_module base;
25 struct tilcdc_panel_info *info;
26 struct display_timings *timings;
27 struct backlight_device *backlight;
28 struct gpio_desc *enable_gpio;
29 };
30 #define to_panel_module(x) container_of(x, struct panel_module, base)
31
32
33
34
35
36
37 struct panel_encoder {
38 struct drm_encoder base;
39 struct panel_module *mod;
40 };
41 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
42
43 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
44 {
45 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
46 struct backlight_device *backlight = panel_encoder->mod->backlight;
47 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
48
49 if (backlight) {
50 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
51 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
52 backlight_update_status(backlight);
53 }
54
55 if (gpio)
56 gpiod_set_value_cansleep(gpio,
57 mode == DRM_MODE_DPMS_ON ? 1 : 0);
58 }
59
60 static void panel_encoder_prepare(struct drm_encoder *encoder)
61 {
62 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
63 }
64
65 static void panel_encoder_commit(struct drm_encoder *encoder)
66 {
67 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
68 }
69
70 static void panel_encoder_mode_set(struct drm_encoder *encoder,
71 struct drm_display_mode *mode,
72 struct drm_display_mode *adjusted_mode)
73 {
74
75 }
76
77 static const struct drm_encoder_funcs panel_encoder_funcs = {
78 .destroy = drm_encoder_cleanup,
79 };
80
81 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
82 .dpms = panel_encoder_dpms,
83 .prepare = panel_encoder_prepare,
84 .commit = panel_encoder_commit,
85 .mode_set = panel_encoder_mode_set,
86 };
87
88 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
89 struct panel_module *mod)
90 {
91 struct panel_encoder *panel_encoder;
92 struct drm_encoder *encoder;
93 int ret;
94
95 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
96 GFP_KERNEL);
97 if (!panel_encoder)
98 return NULL;
99
100 panel_encoder->mod = mod;
101
102 encoder = &panel_encoder->base;
103 encoder->possible_crtcs = 1;
104
105 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
106 DRM_MODE_ENCODER_LVDS, NULL);
107 if (ret < 0)
108 goto fail;
109
110 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
111
112 return encoder;
113
114 fail:
115 drm_encoder_cleanup(encoder);
116 return NULL;
117 }
118
119
120
121
122
123 struct panel_connector {
124 struct drm_connector base;
125
126 struct drm_encoder *encoder;
127 struct panel_module *mod;
128 };
129 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
130
131
132 static void panel_connector_destroy(struct drm_connector *connector)
133 {
134 drm_connector_unregister(connector);
135 drm_connector_cleanup(connector);
136 }
137
138 static int panel_connector_get_modes(struct drm_connector *connector)
139 {
140 struct drm_device *dev = connector->dev;
141 struct panel_connector *panel_connector = to_panel_connector(connector);
142 struct display_timings *timings = panel_connector->mod->timings;
143 int i;
144
145 for (i = 0; i < timings->num_timings; i++) {
146 struct drm_display_mode *mode = drm_mode_create(dev);
147 struct videomode vm;
148
149 if (videomode_from_timings(timings, &vm, i))
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
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
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
223
224
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
255
256
257
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
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
304 static int panel_probe(struct platform_device *pdev)
305 {
306 struct device_node *bl_node, *node = pdev->dev.of_node;
307 struct panel_module *panel_mod;
308 struct tilcdc_module *mod;
309 struct pinctrl *pinctrl;
310 int ret;
311
312
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 bl_node = of_parse_phandle(node, "backlight", 0);
323 if (bl_node) {
324 panel_mod->backlight = of_find_backlight_by_node(bl_node);
325 of_node_put(bl_node);
326
327 if (!panel_mod->backlight)
328 return -EPROBE_DEFER;
329
330 dev_info(&pdev->dev, "found backlight\n");
331 }
332
333 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
334 GPIOD_OUT_LOW);
335 if (IS_ERR(panel_mod->enable_gpio)) {
336 ret = PTR_ERR(panel_mod->enable_gpio);
337 dev_err(&pdev->dev, "failed to request enable GPIO\n");
338 goto fail_backlight;
339 }
340
341 if (panel_mod->enable_gpio)
342 dev_info(&pdev->dev, "found enable GPIO\n");
343
344 mod = &panel_mod->base;
345 pdev->dev.platform_data = mod;
346
347 tilcdc_module_init(mod, "panel", &panel_module_ops);
348
349 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
350 if (IS_ERR(pinctrl))
351 dev_warn(&pdev->dev, "pins are not configured\n");
352
353 panel_mod->timings = of_get_display_timings(node);
354 if (!panel_mod->timings) {
355 dev_err(&pdev->dev, "could not get panel timings\n");
356 ret = -EINVAL;
357 goto fail_free;
358 }
359
360 panel_mod->info = of_get_panel_info(node);
361 if (!panel_mod->info) {
362 dev_err(&pdev->dev, "could not get panel info\n");
363 ret = -EINVAL;
364 goto fail_timings;
365 }
366
367 return 0;
368
369 fail_timings:
370 display_timings_release(panel_mod->timings);
371
372 fail_free:
373 tilcdc_module_cleanup(mod);
374
375 fail_backlight:
376 if (panel_mod->backlight)
377 put_device(&panel_mod->backlight->dev);
378 return ret;
379 }
380
381 static int panel_remove(struct platform_device *pdev)
382 {
383 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
384 struct panel_module *panel_mod = to_panel_module(mod);
385 struct backlight_device *backlight = panel_mod->backlight;
386
387 if (backlight)
388 put_device(&backlight->dev);
389
390 display_timings_release(panel_mod->timings);
391
392 tilcdc_module_cleanup(mod);
393 kfree(panel_mod->info);
394
395 return 0;
396 }
397
398 static const struct of_device_id panel_of_match[] = {
399 { .compatible = "ti,tilcdc,panel", },
400 { },
401 };
402
403 struct platform_driver panel_driver = {
404 .probe = panel_probe,
405 .remove = panel_remove,
406 .driver = {
407 .owner = THIS_MODULE,
408 .name = "tilcdc-panel",
409 .of_match_table = panel_of_match,
410 },
411 };
412
413 int __init tilcdc_panel_init(void)
414 {
415 return platform_driver_register(&panel_driver);
416 }
417
418 void __exit tilcdc_panel_fini(void)
419 {
420 platform_driver_unregister(&panel_driver);
421 }