1 // SPDX-License-Identifier: GPL-2.0-only
3 * Copyright (C) 2012 Texas Instruments
4 * Author: Rob Clark <robdclark@gmail.com>
7 #include <linux/pinctrl/pinmux.h>
8 #include <linux/pinctrl/consumer.h>
9 #include <linux/backlight.h>
10 #include <linux/gpio/consumer.h>
11 #include <video/display_timing.h>
12 #include <video/of_display_timing.h>
13 #include <video/videomode.h>
14 #include <drm/drm_atomic_helper.h>
15 #include <drm/drm_probe_helper.h>
17 #include "tilcdc_drv.h"
18 #include "tilcdc_panel.h"
21 struct tilcdc_module base;
22 struct tilcdc_panel_info *info;
23 struct display_timings *timings;
24 struct backlight_device *backlight;
25 struct gpio_desc *enable_gpio;
27 #define to_panel_module(x) container_of(x, struct panel_module, base)
34 struct panel_encoder {
35 struct drm_encoder base;
36 struct panel_module *mod;
38 #define to_panel_encoder(x) container_of(x, struct panel_encoder, base)
40 static void panel_encoder_dpms(struct drm_encoder *encoder, int mode)
42 struct panel_encoder *panel_encoder = to_panel_encoder(encoder);
43 struct backlight_device *backlight = panel_encoder->mod->backlight;
44 struct gpio_desc *gpio = panel_encoder->mod->enable_gpio;
47 backlight->props.power = mode == DRM_MODE_DPMS_ON ?
48 FB_BLANK_UNBLANK : FB_BLANK_POWERDOWN;
49 backlight_update_status(backlight);
53 gpiod_set_value_cansleep(gpio,
54 mode == DRM_MODE_DPMS_ON ? 1 : 0);
57 static void panel_encoder_prepare(struct drm_encoder *encoder)
59 panel_encoder_dpms(encoder, DRM_MODE_DPMS_OFF);
62 static void panel_encoder_commit(struct drm_encoder *encoder)
64 panel_encoder_dpms(encoder, DRM_MODE_DPMS_ON);
67 static void panel_encoder_mode_set(struct drm_encoder *encoder,
68 struct drm_display_mode *mode,
69 struct drm_display_mode *adjusted_mode)
74 static const struct drm_encoder_funcs panel_encoder_funcs = {
75 .destroy = drm_encoder_cleanup,
78 static const struct drm_encoder_helper_funcs panel_encoder_helper_funcs = {
79 .dpms = panel_encoder_dpms,
80 .prepare = panel_encoder_prepare,
81 .commit = panel_encoder_commit,
82 .mode_set = panel_encoder_mode_set,
85 static struct drm_encoder *panel_encoder_create(struct drm_device *dev,
86 struct panel_module *mod)
88 struct panel_encoder *panel_encoder;
89 struct drm_encoder *encoder;
92 panel_encoder = devm_kzalloc(dev->dev, sizeof(*panel_encoder),
97 panel_encoder->mod = mod;
99 encoder = &panel_encoder->base;
100 encoder->possible_crtcs = 1;
102 ret = drm_encoder_init(dev, encoder, &panel_encoder_funcs,
103 DRM_MODE_ENCODER_LVDS, NULL);
107 drm_encoder_helper_add(encoder, &panel_encoder_helper_funcs);
112 drm_encoder_cleanup(encoder);
120 struct panel_connector {
121 struct drm_connector base;
123 struct drm_encoder *encoder; /* our connected encoder */
124 struct panel_module *mod;
126 #define to_panel_connector(x) container_of(x, struct panel_connector, base)
129 static void panel_connector_destroy(struct drm_connector *connector)
131 drm_connector_unregister(connector);
132 drm_connector_cleanup(connector);
135 static int panel_connector_get_modes(struct drm_connector *connector)
137 struct drm_device *dev = connector->dev;
138 struct panel_connector *panel_connector = to_panel_connector(connector);
139 struct display_timings *timings = panel_connector->mod->timings;
142 for (i = 0; i < timings->num_timings; i++) {
143 struct drm_display_mode *mode = drm_mode_create(dev);
146 if (videomode_from_timings(timings, &vm, i))
149 drm_display_mode_from_videomode(&vm, mode);
151 mode->type = DRM_MODE_TYPE_DRIVER;
153 if (timings->native_mode == i)
154 mode->type |= DRM_MODE_TYPE_PREFERRED;
156 drm_mode_set_name(mode);
157 drm_mode_probed_add(connector, mode);
163 static int panel_connector_mode_valid(struct drm_connector *connector,
164 struct drm_display_mode *mode)
166 struct tilcdc_drm_private *priv = connector->dev->dev_private;
167 /* our only constraints are what the crtc can generate: */
168 return tilcdc_crtc_mode_valid(priv->crtc, mode);
171 static struct drm_encoder *panel_connector_best_encoder(
172 struct drm_connector *connector)
174 struct panel_connector *panel_connector = to_panel_connector(connector);
175 return panel_connector->encoder;
178 static const struct drm_connector_funcs panel_connector_funcs = {
179 .destroy = panel_connector_destroy,
180 .fill_modes = drm_helper_probe_single_connector_modes,
181 .reset = drm_atomic_helper_connector_reset,
182 .atomic_duplicate_state = drm_atomic_helper_connector_duplicate_state,
183 .atomic_destroy_state = drm_atomic_helper_connector_destroy_state,
186 static const struct drm_connector_helper_funcs panel_connector_helper_funcs = {
187 .get_modes = panel_connector_get_modes,
188 .mode_valid = panel_connector_mode_valid,
189 .best_encoder = panel_connector_best_encoder,
192 static struct drm_connector *panel_connector_create(struct drm_device *dev,
193 struct panel_module *mod, struct drm_encoder *encoder)
195 struct panel_connector *panel_connector;
196 struct drm_connector *connector;
199 panel_connector = devm_kzalloc(dev->dev, sizeof(*panel_connector),
201 if (!panel_connector)
204 panel_connector->encoder = encoder;
205 panel_connector->mod = mod;
207 connector = &panel_connector->base;
209 drm_connector_init(dev, connector, &panel_connector_funcs,
210 DRM_MODE_CONNECTOR_LVDS);
211 drm_connector_helper_add(connector, &panel_connector_helper_funcs);
213 connector->interlace_allowed = 0;
214 connector->doublescan_allowed = 0;
216 ret = drm_connector_attach_encoder(connector, encoder);
223 panel_connector_destroy(connector);
231 static int panel_modeset_init(struct tilcdc_module *mod, struct drm_device *dev)
233 struct panel_module *panel_mod = to_panel_module(mod);
234 struct tilcdc_drm_private *priv = dev->dev_private;
235 struct drm_encoder *encoder;
236 struct drm_connector *connector;
238 encoder = panel_encoder_create(dev, panel_mod);
242 connector = panel_connector_create(dev, panel_mod, encoder);
246 priv->encoders[priv->num_encoders++] = encoder;
247 priv->connectors[priv->num_connectors++] = connector;
249 tilcdc_crtc_set_panel_info(priv->crtc,
250 to_panel_encoder(encoder)->mod->info);
255 static const struct tilcdc_module_ops panel_module_ops = {
256 .modeset_init = panel_modeset_init,
263 /* maybe move this somewhere common if it is needed by other outputs? */
264 static struct tilcdc_panel_info *of_get_panel_info(struct device_node *np)
266 struct device_node *info_np;
267 struct tilcdc_panel_info *info;
271 pr_err("%s: no devicenode given\n", __func__);
275 info_np = of_get_child_by_name(np, "panel-info");
277 pr_err("%s: could not find panel-info node\n", __func__);
281 info = kzalloc(sizeof(*info), GFP_KERNEL);
285 ret |= of_property_read_u32(info_np, "ac-bias", &info->ac_bias);
286 ret |= of_property_read_u32(info_np, "ac-bias-intrpt", &info->ac_bias_intrpt);
287 ret |= of_property_read_u32(info_np, "dma-burst-sz", &info->dma_burst_sz);
288 ret |= of_property_read_u32(info_np, "bpp", &info->bpp);
289 ret |= of_property_read_u32(info_np, "fdd", &info->fdd);
290 ret |= of_property_read_u32(info_np, "sync-edge", &info->sync_edge);
291 ret |= of_property_read_u32(info_np, "sync-ctrl", &info->sync_ctrl);
292 ret |= of_property_read_u32(info_np, "raster-order", &info->raster_order);
293 ret |= of_property_read_u32(info_np, "fifo-th", &info->fifo_th);
296 info->tft_alt_mode = of_property_read_bool(info_np, "tft-alt-mode");
297 info->invert_pxl_clk = of_property_read_bool(info_np, "invert-pxl-clk");
300 pr_err("%s: error reading panel-info properties\n", __func__);
306 of_node_put(info_np);
310 static int panel_probe(struct platform_device *pdev)
312 struct device_node *bl_node, *node = pdev->dev.of_node;
313 struct panel_module *panel_mod;
314 struct tilcdc_module *mod;
315 struct pinctrl *pinctrl;
318 /* bail out early if no DT data: */
320 dev_err(&pdev->dev, "device-tree data is missing\n");
324 panel_mod = devm_kzalloc(&pdev->dev, sizeof(*panel_mod), GFP_KERNEL);
328 bl_node = of_parse_phandle(node, "backlight", 0);
330 panel_mod->backlight = of_find_backlight_by_node(bl_node);
331 of_node_put(bl_node);
333 if (!panel_mod->backlight)
334 return -EPROBE_DEFER;
336 dev_info(&pdev->dev, "found backlight\n");
339 panel_mod->enable_gpio = devm_gpiod_get_optional(&pdev->dev, "enable",
341 if (IS_ERR(panel_mod->enable_gpio)) {
342 ret = PTR_ERR(panel_mod->enable_gpio);
343 dev_err(&pdev->dev, "failed to request enable GPIO\n");
347 if (panel_mod->enable_gpio)
348 dev_info(&pdev->dev, "found enable GPIO\n");
350 mod = &panel_mod->base;
351 pdev->dev.platform_data = mod;
353 tilcdc_module_init(mod, "panel", &panel_module_ops);
355 pinctrl = devm_pinctrl_get_select_default(&pdev->dev);
357 dev_warn(&pdev->dev, "pins are not configured\n");
359 panel_mod->timings = of_get_display_timings(node);
360 if (!panel_mod->timings) {
361 dev_err(&pdev->dev, "could not get panel timings\n");
366 panel_mod->info = of_get_panel_info(node);
367 if (!panel_mod->info) {
368 dev_err(&pdev->dev, "could not get panel info\n");
376 display_timings_release(panel_mod->timings);
379 tilcdc_module_cleanup(mod);
382 if (panel_mod->backlight)
383 put_device(&panel_mod->backlight->dev);
387 static int panel_remove(struct platform_device *pdev)
389 struct tilcdc_module *mod = dev_get_platdata(&pdev->dev);
390 struct panel_module *panel_mod = to_panel_module(mod);
391 struct backlight_device *backlight = panel_mod->backlight;
394 put_device(&backlight->dev);
396 display_timings_release(panel_mod->timings);
398 tilcdc_module_cleanup(mod);
399 kfree(panel_mod->info);
404 static const struct of_device_id panel_of_match[] = {
405 { .compatible = "ti,tilcdc,panel", },
409 struct platform_driver panel_driver = {
410 .probe = panel_probe,
411 .remove = panel_remove,
413 .owner = THIS_MODULE,
414 .name = "tilcdc-panel",
415 .of_match_table = panel_of_match,
419 int __init tilcdc_panel_init(void)
421 return platform_driver_register(&panel_driver);
424 void __exit tilcdc_panel_fini(void)
426 platform_driver_unregister(&panel_driver);