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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
42static struct ida bl_ida;
43#define BL_NAME_SIZE 15
44
45static bool
46nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
47 struct nouveau_backlight *bl)
48{
49 const int nb = ida_simple_get(&bl_ida, 0, 0, GFP_KERNEL);
50 if (nb < 0 || nb >= 100)
51 return false;
52 if (nb > 0)
53 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
54 else
55 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
56 bl->id = nb;
57 return true;
58}
59
60static int
61nv40_get_intensity(struct backlight_device *bd)
62{
63 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
64 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
65 struct nvif_object *device = &drm->client.device.object;
66 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
67 NV40_PMC_BACKLIGHT_MASK) >> 16;
68
69 return val;
70}
71
72static int
73nv40_set_intensity(struct backlight_device *bd)
74{
75 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
76 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
77 struct nvif_object *device = &drm->client.device.object;
78 int val = bd->props.brightness;
79 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
80
81 nvif_wr32(device, NV40_PMC_BACKLIGHT,
82 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
83
84 return 0;
85}
86
87static const struct backlight_ops nv40_bl_ops = {
88 .options = BL_CORE_SUSPENDRESUME,
89 .get_brightness = nv40_get_intensity,
90 .update_status = nv40_set_intensity,
91};
92
93static int
94nv40_backlight_init(struct nouveau_encoder *encoder,
95 struct backlight_properties *props,
96 const struct backlight_ops **ops)
97{
98 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
99 struct nvif_object *device = &drm->client.device.object;
100
101 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
102 return -ENODEV;
103
104 props->type = BACKLIGHT_RAW;
105 props->max_brightness = 31;
106 *ops = &nv40_bl_ops;
107 return 0;
108}
109
110static int
111nv50_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
125static int
126nv50_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
140static 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
148
149
150static int
151nv50_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
161retry:
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;
182out:
183 drm_modeset_drop_locks(&ctx);
184 drm_modeset_acquire_fini(&ctx);
185 return ret;
186deadlock:
187 drm_modeset_backoff(&ctx);
188 goto retry;
189}
190
191static int
192nv50_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);
204retry:
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
224out:
225 drm_modeset_drop_locks(&ctx);
226 drm_modeset_acquire_fini(&ctx);
227 return ret;
228deadlock:
229 drm_modeset_backoff(&ctx);
230 goto retry;
231}
232
233static const struct backlight_ops nv50_edp_bl_ops = {
234 .get_brightness = nv50_edp_get_brightness,
235 .update_status = nv50_edp_set_brightness,
236};
237
238static int
239nva3_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
256static int
257nva3_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
278static 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
285
286
287static int
288nv50_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 return -ENODEV;
299
300 if (nv_conn->type == DCB_CONNECTOR_eDP) {
301 int ret;
302 u16 current_level;
303 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
304 u8 current_mode;
305
306 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
307 EDP_DISPLAY_CTL_CAP_SIZE);
308 if (ret < 0)
309 return ret;
310
311 if (drm_edp_backlight_supported(edp_dpcd)) {
312 NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
313 nv_conn->base.name);
314
315 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
316 ¤t_level, ¤t_mode);
317 if (ret < 0)
318 return ret;
319
320 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
321 if (ret < 0) {
322 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
323 nv_conn->base.name, ret);
324 return ret;
325 }
326
327 *ops = &nv50_edp_bl_ops;
328 props->brightness = current_level;
329 props->max_brightness = bl->edp_info.max;
330 bl->uses_dpcd = true;
331 return 0;
332 }
333 }
334
335 if (drm->client.device.info.chipset <= 0xa0 ||
336 drm->client.device.info.chipset == 0xaa ||
337 drm->client.device.info.chipset == 0xac)
338 *ops = &nv50_bl_ops;
339 else
340 *ops = &nva3_bl_ops;
341
342 props->type = BACKLIGHT_RAW;
343 props->max_brightness = 100;
344
345 return 0;
346}
347
348int
349nouveau_backlight_init(struct drm_connector *connector)
350{
351 struct nouveau_drm *drm = nouveau_drm(connector->dev);
352 struct nouveau_backlight *bl;
353 struct nouveau_encoder *nv_encoder = NULL;
354 struct nvif_device *device = &drm->client.device;
355 char backlight_name[BL_NAME_SIZE];
356 struct backlight_properties props = {0};
357 const struct backlight_ops *ops;
358 int ret;
359
360 if (apple_gmux_present()) {
361 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
362 return 0;
363 }
364
365 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
366 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
367 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
368 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
369 else
370 return 0;
371
372 if (!nv_encoder)
373 return 0;
374
375 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
376 if (!bl)
377 return -ENOMEM;
378
379 switch (device->info.family) {
380 case NV_DEVICE_INFO_V0_CURIE:
381 ret = nv40_backlight_init(nv_encoder, &props, &ops);
382 break;
383 case NV_DEVICE_INFO_V0_TESLA:
384 case NV_DEVICE_INFO_V0_FERMI:
385 case NV_DEVICE_INFO_V0_KEPLER:
386 case NV_DEVICE_INFO_V0_MAXWELL:
387 case NV_DEVICE_INFO_V0_PASCAL:
388 case NV_DEVICE_INFO_V0_VOLTA:
389 case NV_DEVICE_INFO_V0_TURING:
390 case NV_DEVICE_INFO_V0_AMPERE:
391 ret = nv50_backlight_init(bl, nouveau_connector(connector),
392 nv_encoder, &props, &ops);
393 break;
394 default:
395 ret = 0;
396 goto fail_alloc;
397 }
398
399 if (ret) {
400 if (ret == -ENODEV)
401 ret = 0;
402 goto fail_alloc;
403 }
404
405 if (!nouveau_get_backlight_name(backlight_name, bl)) {
406 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
407 goto fail_alloc;
408 }
409
410 bl->dev = backlight_device_register(backlight_name, connector->kdev,
411 nv_encoder, ops, &props);
412 if (IS_ERR(bl->dev)) {
413 if (bl->id >= 0)
414 ida_simple_remove(&bl_ida, bl->id);
415 ret = PTR_ERR(bl->dev);
416 goto fail_alloc;
417 }
418
419 nouveau_connector(connector)->backlight = bl;
420 if (!bl->dev->props.brightness)
421 bl->dev->props.brightness =
422 bl->dev->ops->get_brightness(bl->dev);
423 backlight_update_status(bl->dev);
424
425 return 0;
426
427fail_alloc:
428 kfree(bl);
429 return ret;
430}
431
432void
433nouveau_backlight_fini(struct drm_connector *connector)
434{
435 struct nouveau_connector *nv_conn = nouveau_connector(connector);
436 struct nouveau_backlight *bl = nv_conn->backlight;
437
438 if (!bl)
439 return;
440
441 if (bl->id >= 0)
442 ida_simple_remove(&bl_ida, bl->id);
443
444 backlight_device_unregister(bl->dev);
445 nv_conn->backlight = NULL;
446 kfree(bl);
447}
448
449void
450nouveau_backlight_ctor(void)
451{
452 ida_init(&bl_ida);
453}
454
455void
456nouveau_backlight_dtor(void)
457{
458 ida_destroy(&bl_ida);
459}
460
