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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 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
 49 {
 50         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
 51         struct backlight_device *backlight = panel_encoder->mod->backlight;
 52         struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
 53 
 54         if (backlight) {
 55                 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
 56                                          FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
 57                 backlight_update_status(backlight);
 58         }
 59 
 60         if (gpio)
 61                 gpiod_set_value_cansleep(gpio,
 62                                          mode == DRM_MODE_DPMS_ON ? 1 : 0);
 63 }
 64 
 65 static void panel_encoder_prepare(struct drm_encoder *encoder)
 66 {
 67         struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
 68         panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
 69         tilcdc_crtc_set_panel_info(encoder->crtc, panel_encoder->mod->info);
 70 }
 71 
 72 static void panel_encoder_commit(struct drm_encoder *encoder)
 73 {
 74         panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
 75 }
 76 
 77 static void panel_encoder_mode_set(struct drm_encoder *encoder,
 78                 struct drm_display_mode *mode,
 79                 struct drm_display_mode *adjusted_mode)
 80 {
 81         /* nothing needed */
 82 }
 83 
 84 static const struct drm_encoder_funcs panel_encoder_funcs = {
 85                 .destroy        = drm_encoder_cleanup,
 86 };
 87 
 88 static 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 
 95 static 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 
123 fail:
124         drm_encoder_cleanup(encoder);
125         return NULL;
126 }
127 
128 /*
129  * Connector:
130  */
131 
132 struct panel_connector {
133         struct drm_connector base;
134 
135         struct drm_encoder *encoder;  /* our connected encoder */
136         struct panel_module *mod;
137 };
138 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
139 
140 
141 static void panel_connector_destroy(struct drm_connector *connector)
142 {
143         drm_connector_unregister(connector);
144         drm_connector_cleanup(connector);
145 }
146 
147 static enum drm_connector_status panel_connector_detect(
148                 struct drm_connector *connector,
149                 bool force)
150 {
151         return connector_status_connected;
152 }
153 
154 static 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 
182 static 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         /* our only constraints are what the crtc can generate: */
187         return tilcdc_crtc_mode_valid(priv->crtc, mode);
188 }
189 
190 static 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 
197 static const struct drm_connector_funcs panel_connector_funcs = {
198         .destroy            = panel_connector_destroy,
199         .dpms               = drm_helper_connector_dpms,
200         .detect             = panel_connector_detect,
201         .fill_modes         = drm_helper_probe_single_connector_modes,
202 };
203 
204 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
205         .get_modes          = panel_connector_get_modes,
206         .mode_valid         = panel_connector_mode_valid,
207         .best_encoder       = panel_connector_best_encoder,
208 };
209 
210 static struct drm_connector *panel_connector_create(struct drm_device *dev,
211                 struct panel_module *mod, struct drm_encoder *encoder)
212 {
213         struct panel_connector *panel_connector;
214         struct drm_connector *connector;
215         int ret;
216 
217         panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
218                                        GFP_KERNEL);
219         if (!panel_connector) {
220                 dev_err(dev->dev, "allocation failed\n");
221                 return NULL;
222         }
223 
224         panel_connector->encoder = encoder;
225         panel_connector->mod = mod;
226 
227         connector = &panel_connector->base;
228 
229         drm_connector_init(dev, connector, &panel_connector_funcs,
230                         DRM_MODE_CONNECTOR_LVDS);
231         drm_connector_helper_add(connector, &panel_connector_helper_funcs);
232 
233         connector->interlace_allowed = 0;
234         connector->doublescan_allowed = 0;
235 
236         ret = drm_mode_connector_attach_encoder(connector, encoder);
237         if (ret)
238                 goto fail;
239 
240         drm_connector_register(connector);
241 
242         return connector;
243 
244 fail:
245         panel_connector_destroy(connector);
246         return NULL;
247 }
248 
249 /*
250  * Module:
251  */
252 
253 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
254 {
255         struct panel_module *panel_mod = to_panel_module(mod);
256         struct tilcdc_drm_private *priv = dev->dev_private;
257         struct drm_encoder *encoder;
258         struct drm_connector *connector;
259 
260         encoder = panel_encoder_create(dev, panel_mod);
261         if (!encoder)
262                 return -ENOMEM;
263 
264         connector = panel_connector_create(dev, panel_mod, encoder);
265         if (!connector)
266                 return -ENOMEM;
267 
268         priv->encoders[priv->num_encoders++] = encoder;
269         priv->connectors[priv->num_connectors++] = connector;
270 
271         return 0;
272 }
273 
274 static const struct tilcdc_module_ops panel_module_ops = {
275                 .modeset_init = panel_modeset_init,
276 };
277 
278 /*
279  * Device:
280  */
281 
282 /* maybe move this somewhere common if it is needed by other outputs? */
283 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
284 {
285         struct device_node *info_np;
286         struct tilcdc_panel_info *info;
287         int ret = 0;
288 
289         if (!np) {
290                 pr_err("%s: no devicenode given\n", __func__);
291                 return NULL;
292         }
293 
294         info_np = of_get_child_by_name(np, "panel-info");
295         if (!info_np) {
296                 pr_err("%s: could not find panel-info node\n", __func__);
297                 return NULL;
298         }
299 
300         info = kzalloc(sizeof(*info), GFP_KERNEL);
301         if (!info) {
302                 pr_err("%s: allocation failed\n", __func__);
303                 of_node_put(info_np);
304                 return NULL;
305         }
306 
307         ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
308         ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
309         ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
310         ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
311         ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
312         ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
313         ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
314         ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
315         ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
316 
317         /* optional: */
318         info->tft_alt_mode      = of_property_read_bool(info_np, "tft-alt-mode");
319         info->invert_pxl_clk    = of_property_read_bool(info_np, "invert-pxl-clk");
320 
321         if (ret) {
322                 pr_err("%s: error reading panel-info properties\n", __func__);
323                 kfree(info);
324                 of_node_put(info_np);
325                 return NULL;
326         }
327         of_node_put(info_np);
328 
329         return info;
330 }
331 
332 static int panel_probe(struct platform_device *pdev)
333 {
334         struct device_node *bl_node, *node = pdev->dev.of_node;
335         struct panel_module *panel_mod;
336         struct tilcdc_module *mod;
337         struct pinctrl *pinctrl;
338         int ret;
339 
340         /* bail out early if no DT data: */
341         if (!node) {
342                 dev_err(&pdev->dev, "device-tree data is missing\n");
343                 return -ENXIO;
344         }
345 
346         panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
347         if (!panel_mod)
348                 return -ENOMEM;
349 
350         bl_node = of_parse_phandle(node, "backlight", 0);
351         if (bl_node) {
352                 panel_mod->backlight = of_find_backlight_by_node(bl_node);
353                 of_node_put(bl_node);
354 
355                 if (!panel_mod->backlight)
356                         return -EPROBE_DEFER;
357 
358                 dev_info(&pdev->dev, "found backlight\n");
359         }
360 
361         panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
362                                                          GPIOD_OUT_LOW);
363         if (IS_ERR(panel_mod->enable_gpio)) {
364                 ret = PTR_ERR(panel_mod->enable_gpio);
365                 dev_err(&pdev->dev, "failed to request enable GPIO\n");
366                 goto fail_backlight;
367         }
368 
369         if (panel_mod->enable_gpio)
370                 dev_info(&pdev->dev, "found enable GPIO\n");
371 
372         mod = &panel_mod->base;
373         pdev->dev.platform_data = mod;
374 
375         tilcdc_module_init(mod, "panel", &panel_module_ops);
376 
377         pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
378         if (IS_ERR(pinctrl))
379                 dev_warn(&pdev->dev, "pins are not configured\n");
380 
381         panel_mod->timings = of_get_display_timings(node);
382         if (!panel_mod->timings) {
383                 dev_err(&pdev->dev, "could not get panel timings\n");
384                 ret = -EINVAL;
385                 goto fail_free;
386         }
387 
388         panel_mod->info = of_get_panel_info(node);
389         if (!panel_mod->info) {
390                 dev_err(&pdev->dev, "could not get panel info\n");
391                 ret = -EINVAL;
392                 goto fail_timings;
393         }
394 
395         mod->preferred_bpp = panel_mod->info->bpp;
396 
397         return 0;
398 
399 fail_timings:
400         display_timings_release(panel_mod->timings);
401 
402 fail_free:
403         tilcdc_module_cleanup(mod);
404 
405 fail_backlight:
406         if (panel_mod->backlight)
407                 put_device(&panel_mod->backlight->dev);
408         return ret;
409 }
410 
411 static int panel_remove(struct platform_device *pdev)
412 {
413         struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
414         struct panel_module *panel_mod = to_panel_module(mod);
415         struct backlight_device *backlight = panel_mod->backlight;
416 
417         if (backlight)
418                 put_device(&backlight->dev);
419 
420         display_timings_release(panel_mod->timings);
421 
422         tilcdc_module_cleanup(mod);
423         kfree(panel_mod->info);
424 
425         return 0;
426 }
427 
428 static struct of_device_id panel_of_match[] = {
429                 { .compatible = "ti,tilcdc,panel", },
430                 { },
431 };
432 
433 struct platform_driver panel_driver = {
434         .probe = panel_probe,
435         .remove = panel_remove,
436         .driver = {
437                 .owner = THIS_MODULE,
438                 .name = "panel",
439                 .of_match_table = panel_of_match,
440         },
441 };
442 
443 int __init tilcdc_panel_init(void)
444 {
445         return platform_driver_register(&panel_driver);
446 }
447 
448 void __exit tilcdc_panel_fini(void)
449 {
450         platform_driver_unregister(&panel_driver);
451 }
452 

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