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

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