2 * Copyright (C) 2012 Texas Instruments
3 * Author: Rob Clark <robdclark@gmail.com>
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.
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
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/>.
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>
25 #include "tilcdc_drv.h"
28 struct tilcdc_module base;
29 struct tilcdc_panel_info *info;
30 struct display_timings *timings;
31 struct backlight_device *backlight;
33 #define to_panel_module(x) container_of(x, struct panel_module, base)
40 struct panel_encoder {
41 struct drm_encoder base;
42 struct panel_module *mod;
44 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
47 static void panel_encoder_destroy(struct drm_encoder *encoder)
49 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
50 drm_encoder_cleanup(encoder);
54 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
56 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
57 struct backlight_device *backlight = panel_encoder->mod->backlight;
62 backlight->props.power = mode == DRM_MODE_DPMS_ON
63 ? FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
64 backlight_update_status(backlight);
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)
75 static void panel_encoder_prepare(struct drm_encoder *encoder)
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);
82 static void panel_encoder_commit(struct drm_encoder *encoder)
84 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
87 static void panel_encoder_mode_set(struct drm_encoder *encoder,
88 struct drm_display_mode *mode,
89 struct drm_display_mode *adjusted_mode)
94 static const struct drm_encoder_funcs panel_encoder_funcs = {
95 .destroy = panel_encoder_destroy,
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,
106 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
107 struct panel_module *mod)
109 struct panel_encoder *panel_encoder;
110 struct drm_encoder *encoder;
113 panel_encoder = kzalloc(sizeof(*panel_encoder), GFP_KERNEL);
114 if (!panel_encoder) {
115 dev_err(dev->dev, "allocation failed\n");
119 panel_encoder->mod = mod;
121 encoder = &panel_encoder->base;
122 encoder->possible_crtcs = 1;
124 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
125 DRM_MODE_ENCODER_LVDS);
129 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
134 panel_encoder_destroy(encoder);
142 struct panel_connector {
143 struct drm_connector base;
145 struct drm_encoder *encoder; /* our connected encoder */
146 struct panel_module *mod;
148 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
151 static void panel_connector_destroy(struct drm_connector *connector)
153 struct panel_connector *panel_connector = to_panel_connector(connector);
154 drm_connector_unregister(connector);
155 drm_connector_cleanup(connector);
156 kfree(panel_connector);
159 static enum drm_connector_status panel_connector_detect(
160 struct drm_connector *connector,
163 return connector_status_connected;
166 static int panel_connector_get_modes(struct drm_connector *connector)
168 struct drm_device *dev = connector->dev;
169 struct panel_connector *panel_connector = to_panel_connector(connector);
170 struct display_timings *timings = panel_connector->mod->timings;
173 for (i = 0; i < timings->num_timings; i++) {
174 struct drm_display_mode *mode = drm_mode_create(dev);
177 if (videomode_from_timings(timings, &vm, i))
180 drm_display_mode_from_videomode(&vm, mode);
182 mode->type = DRM_MODE_TYPE_DRIVER;
184 if (timings->native_mode == i)
185 mode->type |= DRM_MODE_TYPE_PREFERRED;
187 drm_mode_set_name(mode);
188 drm_mode_probed_add(connector, mode);
194 static int panel_connector_mode_valid(struct drm_connector *connector,
195 struct drm_display_mode *mode)
197 struct tilcdc_drm_private *priv = connector->dev->dev_private;
198 /* our only constraints are what the crtc can generate: */
199 return tilcdc_crtc_mode_valid(priv->crtc, mode);
202 static struct drm_encoder *panel_connector_best_encoder(
203 struct drm_connector *connector)
205 struct panel_connector *panel_connector = to_panel_connector(connector);
206 return panel_connector->encoder;
209 static const struct drm_connector_funcs panel_connector_funcs = {
210 .destroy = panel_connector_destroy,
211 .dpms = drm_helper_connector_dpms,
212 .detect = panel_connector_detect,
213 .fill_modes = drm_helper_probe_single_connector_modes,
216 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
217 .get_modes = panel_connector_get_modes,
218 .mode_valid = panel_connector_mode_valid,
219 .best_encoder = panel_connector_best_encoder,
222 static struct drm_connector *panel_connector_create(struct drm_device *dev,
223 struct panel_module *mod, struct drm_encoder *encoder)
225 struct panel_connector *panel_connector;
226 struct drm_connector *connector;
229 panel_connector = kzalloc(sizeof(*panel_connector), GFP_KERNEL);
230 if (!panel_connector) {
231 dev_err(dev->dev, "allocation failed\n");
235 panel_connector->encoder = encoder;
236 panel_connector->mod = mod;
238 connector = &panel_connector->base;
240 drm_connector_init(dev, connector, &panel_connector_funcs,
241 DRM_MODE_CONNECTOR_LVDS);
242 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
244 connector->interlace_allowed = 0;
245 connector->doublescan_allowed = 0;
247 ret = drm_mode_connector_attach_encoder(connector, encoder);
251 drm_connector_register(connector);
256 panel_connector_destroy(connector);
264 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
266 struct panel_module *panel_mod = to_panel_module(mod);
267 struct tilcdc_drm_private *priv = dev->dev_private;
268 struct drm_encoder *encoder;
269 struct drm_connector *connector;
271 encoder = panel_encoder_create(dev, panel_mod);
275 connector = panel_connector_create(dev, panel_mod, encoder);
279 priv->encoders[priv->num_encoders++] = encoder;
280 priv->connectors[priv->num_connectors++] = connector;
285 static const struct tilcdc_module_ops panel_module_ops = {
286 .modeset_init = panel_modeset_init,
293 /* maybe move this somewhere common if it is needed by other outputs? */
294 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
296 struct device_node *info_np;
297 struct tilcdc_panel_info *info;
301 pr_err("%s: no devicenode given\n", __func__);
305 info_np = of_get_child_by_name(np, "panel-info");
307 pr_err("%s: could not find panel-info node\n", __func__);
311 info = kzalloc(sizeof(*info), GFP_KERNEL);
313 pr_err("%s: allocation failed\n", __func__);
317 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
318 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
319 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
320 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
321 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
322 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
323 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
324 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
325 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
328 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
329 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
332 pr_err("%s: error reading panel-info properties\n", __func__);
340 static struct of_device_id panel_of_match[];
342 static int panel_probe(struct platform_device *pdev)
344 struct device_node *node = pdev->dev.of_node;
345 struct panel_module *panel_mod;
346 struct tilcdc_module *mod;
347 struct pinctrl *pinctrl;
351 /* bail out early if no DT data: */
353 dev_err(&pdev->dev, "device-tree data is missing\n");
357 panel_mod = kzalloc(sizeof(*panel_mod), GFP_KERNEL);
361 mod = &panel_mod->base;
362 pdev->dev.platform_data = mod;
364 tilcdc_module_init(mod, "panel", &panel_module_ops);
366 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
368 dev_warn(&pdev->dev, "pins are not configured\n");
370 panel_mod->timings = of_get_display_timings(node);
371 if (!panel_mod->timings) {
372 dev_err(&pdev->dev, "could not get panel timings\n");
376 panel_mod->info = of_get_panel_info(node);
377 if (!panel_mod->info) {
378 dev_err(&pdev->dev, "could not get panel info\n");
382 mod->preferred_bpp = panel_mod->info->bpp;
384 panel_mod->backlight = of_find_backlight_by_node(node);
385 if (panel_mod->backlight)
386 dev_info(&pdev->dev, "found backlight\n");
391 display_timings_release(panel_mod->timings);
395 tilcdc_module_cleanup(mod);
399 static int panel_remove(struct platform_device *pdev)
401 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
402 struct panel_module *panel_mod = to_panel_module(mod);
404 display_timings_release(panel_mod->timings);
406 tilcdc_module_cleanup(mod);
407 kfree(panel_mod->info);
413 static struct of_device_id panel_of_match[] = {
414 { .compatible = "ti,tilcdc,panel", },
418 struct platform_driver panel_driver = {
419 .probe = panel_probe,
420 .remove = panel_remove,
422 .owner = THIS_MODULE,
424 .of_match_table = panel_of_match,
428 int __init tilcdc_panel_init(void)
430 return platform_driver_register(&panel_driver);
433 void __exit tilcdc_panel_fini(void)
435 platform_driver_unregister(&panel_driver);