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
37 #include "nouveau_drv.h"
38 #include "nouveau_reg.h"
39 #include "nouveau_encoder.h"
40 #include "nouveau_connector.h"
41
42 static struct ida bl_ida;
43 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
44
45 static bool
nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],struct nouveau_backlight * bl)46 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
47 struct nouveau_backlight *bl)
48 {
49 const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
50
51 if (nb < 0)
52 return false;
53 if (nb > 0)
54 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
55 else
56 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
57 bl->id = nb;
58 return true;
59 }
60
61 static int
nv40_get_intensity(struct backlight_device * bd)62 nv40_get_intensity(struct backlight_device *bd)
63 {
64 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
65 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
66 struct nvif_object *device = &drm->client.device.object;
67 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
68 NV40_PMC_BACKLIGHT_MASK) >> 16;
69
70 return val;
71 }
72
73 static int
nv40_set_intensity(struct backlight_device * bd)74 nv40_set_intensity(struct backlight_device *bd)
75 {
76 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
77 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
78 struct nvif_object *device = &drm->client.device.object;
79 int val = bd->props.brightness;
80 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
81
82 nvif_wr32(device, NV40_PMC_BACKLIGHT,
83 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
84
85 return 0;
86 }
87
88 static const struct backlight_ops nv40_bl_ops = {
89 .options = BL_CORE_SUSPENDRESUME,
90 .get_brightness = nv40_get_intensity,
91 .update_status = nv40_set_intensity,
92 };
93
94 static int
nv40_backlight_init(struct nouveau_encoder * encoder,struct backlight_properties * props,const struct backlight_ops ** ops)95 nv40_backlight_init(struct nouveau_encoder *encoder,
96 struct backlight_properties *props,
97 const struct backlight_ops **ops)
98 {
99 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
100 struct nvif_object *device = &drm->client.device.object;
101
102 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
103 return -ENODEV;
104
105 props->max_brightness = 31;
106 *ops = &nv40_bl_ops;
107 return 0;
108 }
109
110 static int
nv50_get_intensity(struct backlight_device * bd)111 nv50_get_intensity(struct backlight_device *bd)
112 {
113 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
114 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
115 struct nvif_object *device = &drm->client.device.object;
116 int or = ffs(nv_encoder->dcb->or) - 1;
117 u32 div = 1025;
118 u32 val;
119
120 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
121 val &= NV50_PDISP_SOR_PWM_CTL_VAL;
122 return ((val * 100) + (div / 2)) / div;
123 }
124
125 static int
nv50_set_intensity(struct backlight_device * bd)126 nv50_set_intensity(struct backlight_device *bd)
127 {
128 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
129 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
130 struct nvif_object *device = &drm->client.device.object;
131 int or = ffs(nv_encoder->dcb->or) - 1;
132 u32 div = 1025;
133 u32 val = (bd->props.brightness * div) / 100;
134
135 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
136 NV50_PDISP_SOR_PWM_CTL_NEW | val);
137 return 0;
138 }
139
140 static const struct backlight_ops nv50_bl_ops = {
141 .options = BL_CORE_SUSPENDRESUME,
142 .get_brightness = nv50_get_intensity,
143 .update_status = nv50_set_intensity,
144 };
145
146 /*
147 * eDP brightness callbacks need to happen under lock, since we need to
148 * enable/disable the backlight ourselves for modesets
149 */
150 static int
nv50_edp_get_brightness(struct backlight_device * bd)151 nv50_edp_get_brightness(struct backlight_device *bd)
152 {
153 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
154 struct drm_device *dev = connector->dev;
155 struct drm_crtc *crtc;
156 struct drm_modeset_acquire_ctx ctx;
157 int ret = 0;
158
159 drm_modeset_acquire_init(&ctx, 0);
160
161 retry:
162 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
163 if (ret == -EDEADLK)
164 goto deadlock;
165 else if (ret < 0)
166 goto out;
167
168 crtc = connector->state->crtc;
169 if (!crtc)
170 goto out;
171
172 ret = drm_modeset_lock(&crtc->mutex, &ctx);
173 if (ret == -EDEADLK)
174 goto deadlock;
175 else if (ret < 0)
176 goto out;
177
178 if (!crtc->state->active)
179 goto out;
180
181 ret = bd->props.brightness;
182 out:
183 drm_modeset_drop_locks(&ctx);
184 drm_modeset_acquire_fini(&ctx);
185 return ret;
186 deadlock:
187 drm_modeset_backoff(&ctx);
188 goto retry;
189 }
190
191 static int
nv50_edp_set_brightness(struct backlight_device * bd)192 nv50_edp_set_brightness(struct backlight_device *bd)
193 {
194 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
195 struct nouveau_connector *nv_connector = nouveau_connector(connector);
196 struct drm_device *dev = connector->dev;
197 struct drm_crtc *crtc;
198 struct drm_dp_aux *aux = &nv_connector->aux;
199 struct nouveau_backlight *nv_bl = nv_connector->backlight;
200 struct drm_modeset_acquire_ctx ctx;
201 int ret = 0;
202
203 drm_modeset_acquire_init(&ctx, 0);
204 retry:
205 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
206 if (ret == -EDEADLK)
207 goto deadlock;
208 else if (ret < 0)
209 goto out;
210
211 crtc = connector->state->crtc;
212 if (!crtc)
213 goto out;
214
215 ret = drm_modeset_lock(&crtc->mutex, &ctx);
216 if (ret == -EDEADLK)
217 goto deadlock;
218 else if (ret < 0)
219 goto out;
220
221 if (crtc->state->active)
222 ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
223
224 out:
225 drm_modeset_drop_locks(&ctx);
226 drm_modeset_acquire_fini(&ctx);
227 return ret;
228 deadlock:
229 drm_modeset_backoff(&ctx);
230 goto retry;
231 }
232
233 static const struct backlight_ops nv50_edp_bl_ops = {
234 .get_brightness = nv50_edp_get_brightness,
235 .update_status = nv50_edp_set_brightness,
236 };
237
238 static int
nva3_get_intensity(struct backlight_device * bd)239 nva3_get_intensity(struct backlight_device *bd)
240 {
241 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
242 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
243 struct nvif_object *device = &drm->client.device.object;
244 int or = ffs(nv_encoder->dcb->or) - 1;
245 u32 div, val;
246
247 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
248 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
249 val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
250 if (div && div >= val)
251 return ((val * 100) + (div / 2)) / div;
252
253 return 100;
254 }
255
256 static int
nva3_set_intensity(struct backlight_device * bd)257 nva3_set_intensity(struct backlight_device *bd)
258 {
259 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
260 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
261 struct nvif_object *device = &drm->client.device.object;
262 int or = ffs(nv_encoder->dcb->or) - 1;
263 u32 div, val;
264
265 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
266 val = (bd->props.brightness * div) / 100;
267 if (div) {
268 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
269 val |
270 NV50_PDISP_SOR_PWM_CTL_NEW |
271 NVA3_PDISP_SOR_PWM_CTL_UNK);
272 return 0;
273 }
274
275 return -EINVAL;
276 }
277
278 static const struct backlight_ops nva3_bl_ops = {
279 .options = BL_CORE_SUSPENDRESUME,
280 .get_brightness = nva3_get_intensity,
281 .update_status = nva3_set_intensity,
282 };
283
284 /* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
285 * registration which happens after the initial modeset
286 */
287 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)288 nv50_backlight_init(struct nouveau_backlight *bl,
289 struct nouveau_connector *nv_conn,
290 struct nouveau_encoder *nv_encoder,
291 struct backlight_properties *props,
292 const struct backlight_ops **ops)
293 {
294 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
295 struct nvif_object *device = &drm->client.device.object;
296
297 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)) ||
298 nv_conn->base.status != connector_status_connected)
299 return -ENODEV;
300
301 if (nv_conn->type == DCB_CONNECTOR_eDP) {
302 int ret;
303 u16 current_level;
304 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
305 u8 current_mode;
306
307 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
308 EDP_DISPLAY_CTL_CAP_SIZE);
309 if (ret < 0)
310 return ret;
311
312 /* TODO: Add support for hybrid PWM/DPCD panels */
313 if (drm_edp_backlight_supported(edp_dpcd) &&
314 (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
315 (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
316 NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
317 nv_conn->base.name);
318
319 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
320 ¤t_level, ¤t_mode);
321 if (ret < 0)
322 return ret;
323
324 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
325 if (ret < 0) {
326 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
327 nv_conn->base.name, ret);
328 return ret;
329 }
330
331 *ops = &nv50_edp_bl_ops;
332 props->brightness = current_level;
333 props->max_brightness = bl->edp_info.max;
334 bl->uses_dpcd = true;
335 return 0;
336 }
337 }
338
339 if (drm->client.device.info.chipset <= 0xa0 ||
340 drm->client.device.info.chipset == 0xaa ||
341 drm->client.device.info.chipset == 0xac)
342 *ops = &nv50_bl_ops;
343 else
344 *ops = &nva3_bl_ops;
345
346 props->max_brightness = 100;
347
348 return 0;
349 }
350
351 int
nouveau_backlight_init(struct drm_connector * connector)352 nouveau_backlight_init(struct drm_connector *connector)
353 {
354 struct nouveau_drm *drm = nouveau_drm(connector->dev);
355 struct nouveau_backlight *bl;
356 struct nouveau_encoder *nv_encoder = NULL;
357 struct nvif_device *device = &drm->client.device;
358 char backlight_name[BL_NAME_SIZE];
359 struct backlight_properties props = {0};
360 const struct backlight_ops *ops;
361 int ret;
362
363 if (apple_gmux_present()) {
364 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
365 return 0;
366 }
367
368 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
369 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
370 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
371 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
372 else
373 return 0;
374
375 if (!nv_encoder)
376 return 0;
377
378 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
379 if (!bl)
380 return -ENOMEM;
381
382 switch (device->info.family) {
383 case NV_DEVICE_INFO_V0_CURIE:
384 ret = nv40_backlight_init(nv_encoder, &props, &ops);
385 break;
386 case NV_DEVICE_INFO_V0_TESLA:
387 case NV_DEVICE_INFO_V0_FERMI:
388 case NV_DEVICE_INFO_V0_KEPLER:
389 case NV_DEVICE_INFO_V0_MAXWELL:
390 case NV_DEVICE_INFO_V0_PASCAL:
391 case NV_DEVICE_INFO_V0_VOLTA:
392 case NV_DEVICE_INFO_V0_TURING:
393 case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed
394 ret = nv50_backlight_init(bl, nouveau_connector(connector),
395 nv_encoder, &props, &ops);
396 break;
397 default:
398 ret = 0;
399 goto fail_alloc;
400 }
401
402 if (ret) {
403 if (ret == -ENODEV)
404 ret = 0;
405 goto fail_alloc;
406 }
407
408 if (!nouveau_get_backlight_name(backlight_name, bl)) {
409 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
410 goto fail_alloc;
411 }
412
413 props.type = BACKLIGHT_RAW;
414 bl->dev = backlight_device_register(backlight_name, connector->kdev,
415 nv_encoder, ops, &props);
416 if (IS_ERR(bl->dev)) {
417 if (bl->id >= 0)
418 ida_free(&bl_ida, bl->id);
419 ret = PTR_ERR(bl->dev);
420 goto fail_alloc;
421 }
422
423 nouveau_connector(connector)->backlight = bl;
424 if (!bl->dev->props.brightness)
425 bl->dev->props.brightness =
426 bl->dev->ops->get_brightness(bl->dev);
427 backlight_update_status(bl->dev);
428
429 return 0;
430
431 fail_alloc:
432 kfree(bl);
433 return ret;
434 }
435
436 void
nouveau_backlight_fini(struct drm_connector * connector)437 nouveau_backlight_fini(struct drm_connector *connector)
438 {
439 struct nouveau_connector *nv_conn = nouveau_connector(connector);
440 struct nouveau_backlight *bl = nv_conn->backlight;
441
442 if (!bl)
443 return;
444
445 if (bl->id >= 0)
446 ida_free(&bl_ida, bl->id);
447
448 backlight_device_unregister(bl->dev);
449 nv_conn->backlight = NULL;
450 kfree(bl);
451 }
452
453 void
nouveau_backlight_ctor(void)454 nouveau_backlight_ctor(void)
455 {
456 ida_init(&bl_ida);
457 }
458
459 void
nouveau_backlight_dtor(void)460 nouveau_backlight_dtor(void)
461 {
462 ida_destroy(&bl_ida);
463 }
464