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Linux/drivers/gpu/drm/tilcdc/tilcdc_panel.c

  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>
 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 
 26 #include "tilcdc_drv.h"
 27 
 28 struct panel_module {
 29         struct tilcdc_module base;
 30         struct tilcdc_panel_info *info;
 31         struct display_timings *timings;
 32         struct backlight_device *backlight;
 33         struct gpio_desc *enable_gpio;
 34 };
 35 #define to_panel_module(x) container_of(x, struct panel_module, base)
 36 
 37 
 38 /*
 39  * Encoder:
 40  */
 41 
 42 struct panel_encoder {
 43         struct drm_encoder base;
 44         struct panel_module *mod;
 45 };
 46 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
 47 
 48 
 49 static void panel_encoder_destroy(struct drm_encoder *encoder)
 50 {
 51         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
 52         drm_encoder_cleanup(encoder);
 53         kfree(panel_encoder);
 54 }
 55 
 56 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
 57 {
 58         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
 59         struct backlight_device *backlight = panel_encoder->mod->backlight;
 60         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
 61 
 62         if (backlight) {
 63                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
 64                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 65                 backlight_update_status(backlight);
 66         }
 67 
 68         if (gpio)
 69                 gpiod_set_value_cansleep(gpio,
 70                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
 71 }
 72 
 73 static bool panel_encoder_mode_fixup(struct drm_encoder *encoder,
 74                 const struct drm_display_mode *mode,
 75                 struct drm_display_mode *adjusted_mode)
 76 {
 77         /* nothing needed */
 78         return true;
 79 }
 80 
 81 static void panel_encoder_prepare(struct drm_encoder *encoder)
 82 {
 83         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
 84         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 85         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
 86 }
 87 
 88 static void panel_encoder_commit(struct drm_encoder *encoder)
 89 {
 90         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 91 }
 92 
 93 static void panel_encoder_mode_set(struct drm_encoder *encoder,
 94                 struct drm_display_mode *mode,
 95                 struct drm_display_mode *adjusted_mode)
 96 {
 97         /* nothing needed */
 98 }
 99 
100 static const struct drm_encoder_funcs panel_encoder_funcs = {
101                 .destroy        = panel_encoder_destroy,
102 };
103 
104 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
105                 .dpms           = panel_encoder_dpms,
106                 .mode_fixup     = panel_encoder_mode_fixup,
107                 .prepare        = panel_encoder_prepare,
108                 .commit         = panel_encoder_commit,
109                 .mode_set       = panel_encoder_mode_set,
110 };
111 
112 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
113                 struct panel_module *mod)
114 {
115         struct panel_encoder *panel_encoder;
116         struct drm_encoder *encoder;
117         int ret;
118 
119         panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
120         if (!panel_encoder) {
121                 dev_err(dev->dev, "allocation failed\n");
122                 return NULL;
123         }
124 
125         panel_encoder->mod = mod;
126 
127         encoder = &panel_encoder->base;
128         encoder->possible_crtcs = 1;
129 
130         ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
131                         DRM_MODE_ENCODER_LVDS);
132         if (ret < 0)
133                 goto fail;
134 
135         drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
136 
137         return encoder;
138 
139 fail:
140         panel_encoder_destroy(encoder);
141         return NULL;
142 }
143 
144 /*
145  * Connector:
146  */
147 
148 struct panel_connector {
149         struct drm_connector base;
150 
151         struct drm_encoder *encoder;  /* our connected encoder */
152         struct panel_module *mod;
153 };
154 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
155 
156 
157 static void panel_connector_destroy(struct drm_connector *connector)
158 {
159         struct panel_connector *panel_connector = to_panel_connector(connector);
160         drm_connector_unregister(connector);
161         drm_connector_cleanup(connector);
162         kfree(panel_connector);
163 }
164 
165 static enum drm_connector_status panel_connector_detect(
166                 struct drm_connector *connector,
167                 bool force)
168 {
169         return connector_status_connected;
170 }
171 
172 static int panel_connector_get_modes(struct drm_connector *connector)
173 {
174         struct drm_device *dev = connector->dev;
175         struct panel_connector *panel_connector = to_panel_connector(connector);
176         struct display_timings *timings = panel_connector->mod->timings;
177         int i;
178 
179         for (i = 0; i < timings->num_timings; i++) {
180                 struct drm_display_mode *mode = drm_mode_create(dev);
181                 struct videomode vm;
182 
183                 if (videomode_from_timings(timings, &vm, i))
184                         break;
185 
186                 drm_display_mode_from_videomode(&vm, mode);
187 
188                 mode->type = DRM_MODE_TYPE_DRIVER;
189 
190                 if (timings->native_mode == i)
191                         mode->type |= DRM_MODE_TYPE_PREFERRED;
192 
193                 drm_mode_set_name(mode);
194                 drm_mode_probed_add(connector, mode);
195         }
196 
197         return i;
198 }
199 
200 static int panel_connector_mode_valid(struct drm_connector *connector,
201                   struct drm_display_mode *mode)
202 {
203         struct tilcdc_drm_private *priv = connector->dev->dev_private;
204         /* our only constraints are what the crtc can generate: */
205         return tilcdc_crtc_mode_valid(priv->crtc, mode);
206 }
207 
208 static struct drm_encoder *panel_connector_best_encoder(
209                 struct drm_connector *connector)
210 {
211         struct panel_connector *panel_connector = to_panel_connector(connector);
212         return panel_connector->encoder;
213 }
214 
215 static const struct drm_connector_funcs panel_connector_funcs = {
216         .destroy            = panel_connector_destroy,
217         .dpms               = drm_helper_connector_dpms,
218         .detect             = panel_connector_detect,
219         .fill_modes         = drm_helper_probe_single_connector_modes,
220 };
221 
222 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
223         .get_modes          = panel_connector_get_modes,
224         .mode_valid         = panel_connector_mode_valid,
225         .best_encoder       = panel_connector_best_encoder,
226 };
227 
228 static struct drm_connector *panel_connector_create(struct drm_device *dev,
229                 struct panel_module *mod, struct drm_encoder *encoder)
230 {
231         struct panel_connector *panel_connector;
232         struct drm_connector *connector;
233         int ret;
234 
235         panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
236         if (!panel_connector) {
237                 dev_err(dev->dev, "allocation failed\n");
238                 return NULL;
239         }
240 
241         panel_connector->encoder = encoder;
242         panel_connector->mod = mod;
243 
244         connector = &panel_connector->base;
245 
246         drm_connector_init(dev, connector, &panel_connector_funcs,
247                         DRM_MODE_CONNECTOR_LVDS);
248         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
249 
250         connector->interlace_allowed = 0;
251         connector->doublescan_allowed = 0;
252 
253         ret = drm_mode_connector_attach_encoder(connector, encoder);
254         if (ret)
255                 goto fail;
256 
257         drm_connector_register(connector);
258 
259         return connector;
260 
261 fail:
262         panel_connector_destroy(connector);
263         return NULL;
264 }
265 
266 /*
267  * Module:
268  */
269 
270 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
271 {
272         struct panel_module *panel_mod = to_panel_module(mod);
273         struct tilcdc_drm_private *priv = dev->dev_private;
274         struct drm_encoder *encoder;
275         struct drm_connector *connector;
276 
277         encoder = panel_encoder_create(dev, panel_mod);
278         if (!encoder)
279                 return -ENOMEM;
280 
281         connector = panel_connector_create(dev, panel_mod, encoder);
282         if (!connector)
283                 return -ENOMEM;
284 
285         priv->encoders[priv->num_encoders++] = encoder;
286         priv->connectors[priv->num_connectors++] = connector;
287 
288         return 0;
289 }
290 
291 static const struct tilcdc_module_ops panel_module_ops = {
292                 .modeset_init = panel_modeset_init,
293 };
294 
295 /*
296  * Device:
297  */
298 
299 /* maybe move this somewhere common if it is needed by other outputs? */
300 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
301 {
302         struct device_node *info_np;
303         struct tilcdc_panel_info *info;
304         int ret = 0;
305 
306         if (!np) {
307                 pr_err("%s: no devicenode given\n", __func__);
308                 return NULL;
309         }
310 
311         info_np = of_get_child_by_name(np, "panel-info");
312         if (!info_np) {
313                 pr_err("%s: could not find panel-info node\n", __func__);
314                 return NULL;
315         }
316 
317         info = kzalloc(sizeof(*info), GFP_KERNEL);
318         if (!info) {
319                 pr_err("%s: allocation failed\n", __func__);
320                 of_node_put(info_np);
321                 return NULL;
322         }
323 
324         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
325         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
326         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
327         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
328         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
329         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
330         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
331         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
332         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
333 
334         /* optional: */
335         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
336         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
337 
338         if (ret) {
339                 pr_err("%s: error reading panel-info properties\n", __func__);
340                 kfree(info);
341                 of_node_put(info_np);
342                 return NULL;
343         }
344         of_node_put(info_np);
345 
346         return info;
347 }
348 
349 static int panel_probe(struct platform_device *pdev)
350 {
351         struct device_node *bl_node, *node = pdev->dev.of_node;
352         struct panel_module *panel_mod;
353         struct tilcdc_module *mod;
354         struct pinctrl *pinctrl;
355         int ret;
356 
357         /* bail out early if no DT data: */
358         if (!node) {
359                 dev_err(&pdev->dev, "device-tree data is missing\n");
360                 return -ENXIO;
361         }
362 
363         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
364         if (!panel_mod)
365                 return -ENOMEM;
366 
367         bl_node = of_parse_phandle(node, "backlight", 0);
368         if (bl_node) {
369                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
370                 of_node_put(bl_node);
371 
372                 if (!panel_mod->backlight)
373                         return -EPROBE_DEFER;
374 
375                 dev_info(&pdev->dev, "found backlight\n");
376         }
377 
378         panel_mod->enable_gpio = devm_gpiod_get(&pdev->dev, "enable");
379         if (IS_ERR(panel_mod->enable_gpio)) {
380                 ret = PTR_ERR(panel_mod->enable_gpio);
381                 if (ret != -ENOENT) {
382                         dev_err(&pdev->dev, "failed to request enable GPIO\n");
383                         goto fail_backlight;
384                 }
385 
386                 /* Optional GPIO is not here, continue silently. */
387                 panel_mod->enable_gpio = NULL;
388         } else {
389                 ret = gpiod_direction_output(panel_mod->enable_gpio, 0);
390                 if (ret < 0) {
391                         dev_err(&pdev->dev, "failed to setup GPIO\n");
392                         goto fail_backlight;
393                 }
394                 dev_info(&pdev->dev, "found enable GPIO\n");
395         }
396 
397         mod = &panel_mod->base;
398         pdev->dev.platform_data = mod;
399 
400         tilcdc_module_init(mod, "panel", &panel_module_ops);
401 
402         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
403         if (IS_ERR(pinctrl))
404                 dev_warn(&pdev->dev, "pins are not configured\n");
405 
406         panel_mod->timings = of_get_display_timings(node);
407         if (!panel_mod->timings) {
408                 dev_err(&pdev->dev, "could not get panel timings\n");
409                 ret = -EINVAL;
410                 goto fail_free;
411         }
412 
413         panel_mod->info = of_get_panel_info(node);
414         if (!panel_mod->info) {
415                 dev_err(&pdev->dev, "could not get panel info\n");
416                 ret = -EINVAL;
417                 goto fail_timings;
418         }
419 
420         mod->preferred_bpp = panel_mod->info->bpp;
421 
422         return 0;
423 
424 fail_timings:
425         display_timings_release(panel_mod->timings);
426 
427 fail_free:
428         tilcdc_module_cleanup(mod);
429 
430 fail_backlight:
431         if (panel_mod->backlight)
432                 put_device(&panel_mod->backlight->dev);
433         return ret;
434 }
435 
436 static int panel_remove(struct platform_device *pdev)
437 {
438         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
439         struct panel_module *panel_mod = to_panel_module(mod);
440         struct backlight_device *backlight = panel_mod->backlight;
441 
442         if (backlight)
443                 put_device(&backlight->dev);
444 
445         display_timings_release(panel_mod->timings);
446 
447         tilcdc_module_cleanup(mod);
448         kfree(panel_mod->info);
449 
450         return 0;
451 }
452 
453 static struct of_device_id panel_of_match[] = {
454                 { .compatible = "ti,tilcdc,panel", },
455                 { },
456 };
457 
458 struct platform_driver panel_driver = {
459         .probe = panel_probe,
460         .remove = panel_remove,
461         .driver = {
462                 .owner = THIS_MODULE,
463                 .name = "panel",
464                 .of_match_table = panel_of_match,
465         },
466 };
467 
468 int __init tilcdc_panel_init(void)
469 {
470         return platform_driver_register(&panel_driver);
471 }
472 
473 void __exit tilcdc_panel_fini(void)
474 {
475         platform_driver_unregister(&panel_driver);
476 }
477 

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