1 /*
2 * Copyright (C) 2009 Red Hat <mjg@redhat.com>
3 *
4 * Permission is hereby granted, free of charge, to any person obtaining
5 * a copy of this software and associated documentation files (the
6 * "Software"), to deal in the Software without restriction, including
7 * without limitation the rights to use, copy, modify, merge, publish,
8 * distribute, sublicense, and/or sell copies of the Software, and to
9 * permit persons to whom the Software is furnished to do so, subject to
10 * the following conditions:
11 *
12 * The above copyright notice and this permission notice (including the
13 * next paragraph) shall be included in all copies or substantial
14 * portions of the Software.
15 *
16 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
17 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
18 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
19 * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE
20 * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION
21 * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION
22 * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
23 *
24 */
25
26 /*
27 * Authors:
28 * Matthew Garrett <mjg@redhat.com>
29 *
30 * Register locations derived from NVClock by Roderick Colenbrander
31 */
32
33 #include <linux/apple-gmux.h>
34 #include <linux/backlight.h>
35 #include <linux/idr.h>
36 #include <drm/drm_probe_helper.h>
37
38 #include "nouveau_drv.h"
39 #include "nouveau_reg.h"
40 #include "nouveau_encoder.h"
41 #include "nouveau_connector.h"
42 #include "nouveau_acpi.h"
43
44 static struct ida bl_ida;
45 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
46
47 static bool
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],struct nouveau_backlight * bl)48 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
49 struct nouveau_backlight *bl)
50 {
51 const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
52
53 if (nb < 0)
54 return false;
55 if (nb > 0)
56 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
57 else
58 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
59 bl->id = nb;
60 return true;
61 }
62
63 static int
nv40_get_intensity(struct backlight_device * bd)64 nv40_get_intensity(struct backlight_device *bd)
65 {
66 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
67 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
68 struct nvif_object *device = &drm->client.device.object;
69 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
70 NV40_PMC_BACKLIGHT_MASK) >> 16;
71
72 return val;
73 }
74
75 static int
nv40_set_intensity(struct backlight_device * bd)76 nv40_set_intensity(struct backlight_device *bd)
77 {
78 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
79 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
80 struct nvif_object *device = &drm->client.device.object;
81 int val = bd->props.brightness;
82 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
83
84 nvif_wr32(device, NV40_PMC_BACKLIGHT,
85 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
86
87 return 0;
88 }
89
90 static const struct backlight_ops nv40_bl_ops = {
91 .options = BL_CORE_SUSPENDRESUME,
92 .get_brightness = nv40_get_intensity,
93 .update_status = nv40_set_intensity,
94 };
95
96 static int
nv40_backlight_init(struct nouveau_encoder * encoder,struct backlight_properties * props,const struct backlight_ops ** ops)97 nv40_backlight_init(struct nouveau_encoder *encoder,
98 struct backlight_properties *props,
99 const struct backlight_ops **ops)
100 {
101 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
102 struct nvif_object *device = &drm->client.device.object;
103
104 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
105 return -ENODEV;
106
107 props->max_brightness = 31;
108 *ops = &nv40_bl_ops;
109 return 0;
110 }
111
112 static int
nv50_get_intensity(struct backlight_device * bd)113 nv50_get_intensity(struct backlight_device *bd)
114 {
115 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
116 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
117 struct nvif_object *device = &drm->client.device.object;
118 int or = ffs(nv_encoder->dcb->or) - 1;
119 u32 div = 1025;
120 u32 val;
121
122 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
123 val &= NV50_PDISP_SOR_PWM_CTL_VAL;
124 return ((val * 100) + (div / 2)) / div;
125 }
126
127 static int
nv50_set_intensity(struct backlight_device * bd)128 nv50_set_intensity(struct backlight_device *bd)
129 {
130 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
131 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
132 struct nvif_object *device = &drm->client.device.object;
133 int or = ffs(nv_encoder->dcb->or) - 1;
134 u32 div = 1025;
135 u32 val = (bd->props.brightness * div) / 100;
136
137 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
138 NV50_PDISP_SOR_PWM_CTL_NEW | val);
139 return 0;
140 }
141
142 static const struct backlight_ops nv50_bl_ops = {
143 .options = BL_CORE_SUSPENDRESUME,
144 .get_brightness = nv50_get_intensity,
145 .update_status = nv50_set_intensity,
146 };
147
148 /*
149 * eDP brightness callbacks need to happen under lock, since we need to
150 * enable/disable the backlight ourselves for modesets
151 */
152 static int
nv50_edp_get_brightness(struct backlight_device * bd)153 nv50_edp_get_brightness(struct backlight_device *bd)
154 {
155 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
156 struct drm_device *dev = connector->dev;
157 struct drm_crtc *crtc;
158 struct drm_modeset_acquire_ctx ctx;
159 int ret = 0;
160
161 drm_modeset_acquire_init(&ctx, 0);
162
163 retry:
164 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
165 if (ret == -EDEADLK)
166 goto deadlock;
167 else if (ret < 0)
168 goto out;
169
170 crtc = connector->state->crtc;
171 if (!crtc)
172 goto out;
173
174 ret = drm_modeset_lock(&crtc->mutex, &ctx);
175 if (ret == -EDEADLK)
176 goto deadlock;
177 else if (ret < 0)
178 goto out;
179
180 if (!crtc->state->active)
181 goto out;
182
183 ret = bd->props.brightness;
184 out:
185 drm_modeset_drop_locks(&ctx);
186 drm_modeset_acquire_fini(&ctx);
187 return ret;
188 deadlock:
189 drm_modeset_backoff(&ctx);
190 goto retry;
191 }
192
193 static int
nv50_edp_set_brightness(struct backlight_device * bd)194 nv50_edp_set_brightness(struct backlight_device *bd)
195 {
196 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
197 struct nouveau_connector *nv_connector = nouveau_connector(connector);
198 struct drm_device *dev = connector->dev;
199 struct drm_crtc *crtc;
200 struct drm_dp_aux *aux = &nv_connector->aux;
201 struct nouveau_backlight *nv_bl = nv_connector->backlight;
202 struct drm_modeset_acquire_ctx ctx;
203 int ret = 0;
204
205 drm_modeset_acquire_init(&ctx, 0);
206 retry:
207 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
208 if (ret == -EDEADLK)
209 goto deadlock;
210 else if (ret < 0)
211 goto out;
212
213 crtc = connector->state->crtc;
214 if (!crtc)
215 goto out;
216
217 ret = drm_modeset_lock(&crtc->mutex, &ctx);
218 if (ret == -EDEADLK)
219 goto deadlock;
220 else if (ret < 0)
221 goto out;
222
223 if (crtc->state->active)
224 ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
225
226 out:
227 drm_modeset_drop_locks(&ctx);
228 drm_modeset_acquire_fini(&ctx);
229 return ret;
230 deadlock:
231 drm_modeset_backoff(&ctx);
232 goto retry;
233 }
234
235 static const struct backlight_ops nv50_edp_bl_ops = {
236 .get_brightness = nv50_edp_get_brightness,
237 .update_status = nv50_edp_set_brightness,
238 };
239
240 static int
nva3_get_intensity(struct backlight_device * bd)241 nva3_get_intensity(struct backlight_device *bd)
242 {
243 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
244 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
245 struct nvif_object *device = &drm->client.device.object;
246 int or = ffs(nv_encoder->dcb->or) - 1;
247 u32 div, val;
248
249 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
250 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
251 val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
252 if (div && div >= val)
253 return ((val * 100) + (div / 2)) / div;
254
255 return 100;
256 }
257
258 static int
nva3_set_intensity(struct backlight_device * bd)259 nva3_set_intensity(struct backlight_device *bd)
260 {
261 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
262 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
263 struct nvif_object *device = &drm->client.device.object;
264 int or = ffs(nv_encoder->dcb->or) - 1;
265 u32 div, val;
266
267 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
268
269 val = backlight_get_brightness(bd);
270 if (val)
271 val = (val * div) / 100;
272
273 if (div) {
274 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
275 val |
276 NV50_PDISP_SOR_PWM_CTL_NEW |
277 NVA3_PDISP_SOR_PWM_CTL_UNK);
278 return 0;
279 }
280
281 return -EINVAL;
282 }
283
284 static const struct backlight_ops nva3_bl_ops = {
285 .options = BL_CORE_SUSPENDRESUME,
286 .get_brightness = nva3_get_intensity,
287 .update_status = nva3_set_intensity,
288 };
289
290 /* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
291 * registration which happens after the initial modeset
292 */
293 static int
nv50_backlight_init(struct nouveau_backlight * bl,struct nouveau_connector * nv_conn,struct nouveau_encoder * nv_encoder,struct backlight_properties * props,const struct backlight_ops ** ops)294 nv50_backlight_init(struct nouveau_backlight *bl,
295 struct nouveau_connector *nv_conn,
296 struct nouveau_encoder *nv_encoder,
297 struct backlight_properties *props,
298 const struct backlight_ops **ops)
299 {
300 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
301 struct nvif_object *device = &drm->client.device.object;
302
303 /*
304 * Note when this runs the connectors have not been probed yet,
305 * so nv_conn->base.status is not set yet.
306 */
307 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)) ||
308 drm_helper_probe_detect(&nv_conn->base, NULL, false) != connector_status_connected)
309 return -ENODEV;
310
311 if (nv_conn->type == DCB_CONNECTOR_eDP) {
312 int ret;
313 u16 current_level;
314 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
315 u8 current_mode;
316
317 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
318 EDP_DISPLAY_CTL_CAP_SIZE);
319 if (ret < 0)
320 return ret;
321
322 /* TODO: Add support for hybrid PWM/DPCD panels */
323 if (drm_edp_backlight_supported(edp_dpcd) &&
324 (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
325 (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
326 NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
327 nv_conn->base.name);
328
329 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
330 ¤t_level, ¤t_mode);
331 if (ret < 0)
332 return ret;
333
334 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
335 if (ret < 0) {
336 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
337 nv_conn->base.name, ret);
338 return ret;
339 }
340
341 *ops = &nv50_edp_bl_ops;
342 props->brightness = current_level;
343 props->max_brightness = bl->edp_info.max;
344 bl->uses_dpcd = true;
345 return 0;
346 }
347 }
348
349 if (drm->client.device.info.chipset <= 0xa0 ||
350 drm->client.device.info.chipset == 0xaa ||
351 drm->client.device.info.chipset == 0xac)
352 *ops = &nv50_bl_ops;
353 else
354 *ops = &nva3_bl_ops;
355
356 props->max_brightness = 100;
357
358 return 0;
359 }
360
361 int
nouveau_backlight_init(struct drm_connector * connector)362 nouveau_backlight_init(struct drm_connector *connector)
363 {
364 struct nouveau_drm *drm = nouveau_drm(connector->dev);
365 struct nouveau_backlight *bl;
366 struct nouveau_encoder *nv_encoder = NULL;
367 struct nvif_device *device = &drm->client.device;
368 char backlight_name[BL_NAME_SIZE];
369 struct backlight_properties props = {0};
370 const struct backlight_ops *ops;
371 int ret;
372
373 if (apple_gmux_present()) {
374 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
375 return 0;
376 }
377
378 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
379 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
380 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
381 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
382 else
383 return 0;
384
385 if (!nv_encoder)
386 return 0;
387
388 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
389 if (!bl)
390 return -ENOMEM;
391
392 switch (device->info.family) {
393 case NV_DEVICE_INFO_V0_CURIE:
394 ret = nv40_backlight_init(nv_encoder, &props, &ops);
395 break;
396 case NV_DEVICE_INFO_V0_TESLA:
397 case NV_DEVICE_INFO_V0_FERMI:
398 case NV_DEVICE_INFO_V0_KEPLER:
399 case NV_DEVICE_INFO_V0_MAXWELL:
400 case NV_DEVICE_INFO_V0_PASCAL:
401 case NV_DEVICE_INFO_V0_VOLTA:
402 case NV_DEVICE_INFO_V0_TURING:
403 case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed
404 ret = nv50_backlight_init(bl, nouveau_connector(connector),
405 nv_encoder, &props, &ops);
406 break;
407 default:
408 ret = 0;
409 goto fail_alloc;
410 }
411
412 if (ret) {
413 if (ret == -ENODEV)
414 ret = 0;
415 goto fail_alloc;
416 }
417
418 if (!nouveau_acpi_video_backlight_use_native()) {
419 NV_INFO(drm, "Skipping nv_backlight registration\n");
420 goto fail_alloc;
421 }
422
423 if (!nouveau_get_backlight_name(backlight_name, bl)) {
424 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
425 goto fail_alloc;
426 }
427
428 props.type = BACKLIGHT_RAW;
429 bl->dev = backlight_device_register(backlight_name, connector->kdev,
430 nv_encoder, ops, &props);
431 if (IS_ERR(bl->dev)) {
432 if (bl->id >= 0)
433 ida_free(&bl_ida, bl->id);
434 ret = PTR_ERR(bl->dev);
435 goto fail_alloc;
436 }
437
438 nouveau_connector(connector)->backlight = bl;
439 if (!bl->dev->props.brightness)
440 bl->dev->props.brightness =
441 bl->dev->ops->get_brightness(bl->dev);
442 backlight_update_status(bl->dev);
443
444 return 0;
445
446 fail_alloc:
447 kfree(bl);
448 /*
449 * If we get here we have an internal panel, but no nv_backlight,
450 * try registering an ACPI video backlight device instead.
451 */
452 if (ret == 0)
453 nouveau_acpi_video_register_backlight();
454
455 return ret;
456 }
457
458 void
nouveau_backlight_fini(struct drm_connector * connector)459 nouveau_backlight_fini(struct drm_connector *connector)
460 {
461 struct nouveau_connector *nv_conn = nouveau_connector(connector);
462 struct nouveau_backlight *bl = nv_conn->backlight;
463
464 if (!bl)
465 return;
466
467 if (bl->id >= 0)
468 ida_free(&bl_ida, bl->id);
469
470 backlight_device_unregister(bl->dev);
471 nv_conn->backlight = NULL;
472 kfree(bl);
473 }
474
475 void
nouveau_backlight_ctor(void)476 nouveau_backlight_ctor(void)
477 {
478 ida_init(&bl_ida);
479 }
480
481 void
nouveau_backlight_dtor(void)482 nouveau_backlight_dtor(void)
483 {
484 ida_destroy(&bl_ida);
485 }
486