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18#include <linux/pinctrl/pinmux.h>
19#include <linux/pinctrl/consumer.h>
20#include <linux/backlight.h>
21#include <linux/gpio/consumer.h>
22#include <video/display_timing.h>
23#include <video/of_display_timing.h>
24#include <video/videomode.h>
25#include <drm/drm_atomic_helper.h>
26
27#include "tilcdc_drv.h"
28#include "tilcdc_panel.h"
29
30struct panel_module {
31 struct tilcdc_module base;
32 struct tilcdc_panel_info *info;
33 struct display_timings *timings;
34 struct backlight_device *backlight;
35 struct gpio_desc *enable_gpio;
36};
37#define to_panel_module(x) container_of(x, struct panel_module, base)
38
39
40
41
42
43
44struct panel_encoder {
45 struct drm_encoder base;
46 struct panel_module *mod;
47};
48#define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
49
50static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
51{
52 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
53 struct backlight_device *backlight = panel_encoder->mod->backlight;
54 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
55
56 if (backlight) {
57 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
58 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
59 backlight_update_status(backlight);
60 }
61
62 if (gpio)
63 gpiod_set_value_cansleep(gpio,
64 mode == DRM_MODE_DPMS_ON ? 1 : 0);
65}
66
67static void panel_encoder_prepare(struct drm_encoder *encoder)
68{
69 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
70}
71
72static void panel_encoder_commit(struct drm_encoder *encoder)
73{
74 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
75}
76
77static void panel_encoder_mode_set(struct drm_encoder *encoder,
78 struct drm_display_mode *mode,
79 struct drm_display_mode *adjusted_mode)
80{
81
82}
83
84static const struct drm_encoder_funcs panel_encoder_funcs = {
85 .destroy = drm_encoder_cleanup,
86};
87
88static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
89 .dpms = panel_encoder_dpms,
90 .prepare = panel_encoder_prepare,
91 .commit = panel_encoder_commit,
92 .mode_set = panel_encoder_mode_set,
93};
94
95static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
96 struct panel_module *mod)
97{
98 struct panel_encoder *panel_encoder;
99 struct drm_encoder *encoder;
100 int ret;
101
102 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
103 GFP_KERNEL);
104 if (!panel_encoder) {
105 dev_err(dev->dev, "allocation failed\n");
106 return NULL;
107 }
108
109 panel_encoder->mod = mod;
110
111 encoder = &panel_encoder->base;
112 encoder->possible_crtcs = 1;
113
114 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
115 DRM_MODE_ENCODER_LVDS, NULL);
116 if (ret < 0)
117 goto fail;
118
119 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
120
121 return encoder;
122
123fail:
124 drm_encoder_cleanup(encoder);
125 return NULL;
126}
127
128
129
130
131
132struct panel_connector {
133 struct drm_connector base;
134
135 struct drm_encoder *encoder;
136 struct panel_module *mod;
137};
138#define to_panel_connector(x) container_of(x, struct panel_connector, base)
139
140
141static void panel_connector_destroy(struct drm_connector *connector)
142{
143 drm_connector_unregister(connector);
144 drm_connector_cleanup(connector);
145}
146
147static enum drm_connector_status panel_connector_detect(
148 struct drm_connector *connector,
149 bool force)
150{
151 return connector_status_connected;
152}
153
154static int panel_connector_get_modes(struct drm_connector *connector)
155{
156 struct drm_device *dev = connector->dev;
157 struct panel_connector *panel_connector = to_panel_connector(connector);
158 struct display_timings *timings = panel_connector->mod->timings;
159 int i;
160
161 for (i = 0; i < timings->num_timings; i++) {
162 struct drm_display_mode *mode = drm_mode_create(dev);
163 struct videomode vm;
164
165 if (videomode_from_timings(timings, &vm, i))
166 break;
167
168 drm_display_mode_from_videomode(&vm, mode);
169
170 mode->type = DRM_MODE_TYPE_DRIVER;
171
172 if (timings->native_mode == i)
173 mode->type |= DRM_MODE_TYPE_PREFERRED;
174
175 drm_mode_set_name(mode);
176 drm_mode_probed_add(connector, mode);
177 }
178
179 return i;
180}
181
182static int panel_connector_mode_valid(struct drm_connector *connector,
183 struct drm_display_mode *mode)
184{
185 struct tilcdc_drm_private *priv = connector->dev->dev_private;
186
187 return tilcdc_crtc_mode_valid(priv->crtc, mode);
188}
189
190static struct drm_encoder *panel_connector_best_encoder(
191 struct drm_connector *connector)
192{
193 struct panel_connector *panel_connector = to_panel_connector(connector);
194 return panel_connector->encoder;
195}
196
197static const struct drm_connector_funcs panel_connector_funcs = {
198 .destroy = panel_connector_destroy,
199 .dpms = drm_atomic_helper_connector_dpms,
200 .detect = panel_connector_detect,
201 .fill_modes = drm_helper_probe_single_connector_modes,
202 .reset = drm_atomic_helper_connector_reset,
203 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
204 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
205};
206
207static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
208 .get_modes = panel_connector_get_modes,
209 .mode_valid = panel_connector_mode_valid,
210 .best_encoder = panel_connector_best_encoder,
211};
212
213static struct drm_connector *panel_connector_create(struct drm_device *dev,
214 struct panel_module *mod, struct drm_encoder *encoder)
215{
216 struct panel_connector *panel_connector;
217 struct drm_connector *connector;
218 int ret;
219
220 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
221 GFP_KERNEL);
222 if (!panel_connector) {
223 dev_err(dev->dev, "allocation failed\n");
224 return NULL;
225 }
226
227 panel_connector->encoder = encoder;
228 panel_connector->mod = mod;
229
230 connector = &panel_connector->base;
231
232 drm_connector_init(dev, connector, &panel_connector_funcs,
233 DRM_MODE_CONNECTOR_LVDS);
234 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
235
236 connector->interlace_allowed = 0;
237 connector->doublescan_allowed = 0;
238
239 ret = drm_mode_connector_attach_encoder(connector, encoder);
240 if (ret)
241 goto fail;
242
243 drm_connector_register(connector);
244
245 return connector;
246
247fail:
248 panel_connector_destroy(connector);
249 return NULL;
250}
251
252
253
254
255
256static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
257{
258 struct panel_module *panel_mod = to_panel_module(mod);
259 struct tilcdc_drm_private *priv = dev->dev_private;
260 struct drm_encoder *encoder;
261 struct drm_connector *connector;
262
263 encoder = panel_encoder_create(dev, panel_mod);
264 if (!encoder)
265 return -ENOMEM;
266
267 connector = panel_connector_create(dev, panel_mod, encoder);
268 if (!connector)
269 return -ENOMEM;
270
271 priv->encoders[priv->num_encoders++] = encoder;
272 priv->connectors[priv->num_connectors++] = connector;
273
274 tilcdc_crtc_set_panel_info(priv->crtc,
275 to_panel_encoder(encoder)->mod->info);
276
277 return 0;
278}
279
280static const struct tilcdc_module_ops panel_module_ops = {
281 .modeset_init = panel_modeset_init,
282};
283
284
285
286
287
288
289static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
290{
291 struct device_node *info_np;
292 struct tilcdc_panel_info *info;
293 int ret = 0;
294
295 if (!np) {
296 pr_err("%s: no devicenode given\n", __func__);
297 return NULL;
298 }
299
300 info_np = of_get_child_by_name(np, "panel-info");
301 if (!info_np) {
302 pr_err("%s: could not find panel-info node\n", __func__);
303 return NULL;
304 }
305
306 info = kzalloc(sizeof(*info), GFP_KERNEL);
307 if (!info) {
308 pr_err("%s: allocation failed\n", __func__);
309 of_node_put(info_np);
310 return NULL;
311 }
312
313 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
314 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
315 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
316 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
317 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
318 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
319 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
320 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
321 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
322
323
324 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
325 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
326
327 if (ret) {
328 pr_err("%s: error reading panel-info properties\n", __func__);
329 kfree(info);
330 of_node_put(info_np);
331 return NULL;
332 }
333 of_node_put(info_np);
334
335 return info;
336}
337
338static int panel_probe(struct platform_device *pdev)
339{
340 struct device_node *bl_node, *node = pdev->dev.of_node;
341 struct panel_module *panel_mod;
342 struct tilcdc_module *mod;
343 struct pinctrl *pinctrl;
344 int ret;
345
346
347 if (!node) {
348 dev_err(&pdev->dev, "device-tree data is missing\n");
349 return -ENXIO;
350 }
351
352 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
353 if (!panel_mod)
354 return -ENOMEM;
355
356 bl_node = of_parse_phandle(node, "backlight", 0);
357 if (bl_node) {
358 panel_mod->backlight = of_find_backlight_by_node(bl_node);
359 of_node_put(bl_node);
360
361 if (!panel_mod->backlight)
362 return -EPROBE_DEFER;
363
364 dev_info(&pdev->dev, "found backlight\n");
365 }
366
367 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
368 GPIOD_OUT_LOW);
369 if (IS_ERR(panel_mod->enable_gpio)) {
370 ret = PTR_ERR(panel_mod->enable_gpio);
371 dev_err(&pdev->dev, "failed to request enable GPIO\n");
372 goto fail_backlight;
373 }
374
375 if (panel_mod->enable_gpio)
376 dev_info(&pdev->dev, "found enable GPIO\n");
377
378 mod = &panel_mod->base;
379 pdev->dev.platform_data = mod;
380
381 tilcdc_module_init(mod, "panel", &panel_module_ops);
382
383 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
384 if (IS_ERR(pinctrl))
385 dev_warn(&pdev->dev, "pins are not configured\n");
386
387 panel_mod->timings = of_get_display_timings(node);
388 if (!panel_mod->timings) {
389 dev_err(&pdev->dev, "could not get panel timings\n");
390 ret = -EINVAL;
391 goto fail_free;
392 }
393
394 panel_mod->info = of_get_panel_info(node);
395 if (!panel_mod->info) {
396 dev_err(&pdev->dev, "could not get panel info\n");
397 ret = -EINVAL;
398 goto fail_timings;
399 }
400
401 return 0;
402
403fail_timings:
404 display_timings_release(panel_mod->timings);
405
406fail_free:
407 tilcdc_module_cleanup(mod);
408
409fail_backlight:
410 if (panel_mod->backlight)
411 put_device(&panel_mod->backlight->dev);
412 return ret;
413}
414
415static int panel_remove(struct platform_device *pdev)
416{
417 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
418 struct panel_module *panel_mod = to_panel_module(mod);
419 struct backlight_device *backlight = panel_mod->backlight;
420
421 if (backlight)
422 put_device(&backlight->dev);
423
424 display_timings_release(panel_mod->timings);
425
426 tilcdc_module_cleanup(mod);
427 kfree(panel_mod->info);
428
429 return 0;
430}
431
432static struct of_device_id panel_of_match[] = {
433 { .compatible = "ti,tilcdc,panel", },
434 { },
435};
436
437struct platform_driver panel_driver = {
438 .probe = panel_probe,
439 .remove = panel_remove,
440 .driver = {
441 .owner = THIS_MODULE,
442 .name = "panel",
443 .of_match_table = panel_of_match,
444 },
445};
446
447int __init tilcdc_panel_init(void)
448{
449 return platform_driver_register(&panel_driver);
450}
451
452void __exit tilcdc_panel_fini(void)
453{
454 platform_driver_unregister(&panel_driver);
455}
456
