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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
44static struct ida bl_ida;
45#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
46
47static bool
48nouveau_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
63static int
64nv40_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
75static int
76nv40_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
90static 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
96static int
97nv40_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/*
113 * eDP brightness callbacks need to happen under lock, since we need to
114 * enable/disable the backlight ourselves for modesets
115 */
116static int
117nv50_edp_get_brightness(struct backlight_device *bd)
118{
119 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
120 struct drm_device *dev = connector->dev;
121 struct drm_crtc *crtc;
122 struct drm_modeset_acquire_ctx ctx;
123 int ret = 0;
124
125 drm_modeset_acquire_init(&ctx, 0);
126
127retry:
128 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
129 if (ret == -EDEADLK)
130 goto deadlock;
131 else if (ret < 0)
132 goto out;
133
134 crtc = connector->state->crtc;
135 if (!crtc)
136 goto out;
137
138 ret = drm_modeset_lock(&crtc->mutex, &ctx);
139 if (ret == -EDEADLK)
140 goto deadlock;
141 else if (ret < 0)
142 goto out;
143
144 if (!crtc->state->active)
145 goto out;
146
147 ret = bd->props.brightness;
148out:
149 drm_modeset_drop_locks(&ctx);
150 drm_modeset_acquire_fini(&ctx);
151 return ret;
152deadlock:
153 drm_modeset_backoff(&ctx);
154 goto retry;
155}
156
157static int
158nv50_edp_set_brightness(struct backlight_device *bd)
159{
160 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
161 struct nouveau_connector *nv_connector = nouveau_connector(connector);
162 struct drm_device *dev = connector->dev;
163 struct drm_crtc *crtc;
164 struct drm_dp_aux *aux = &nv_connector->aux;
165 struct nouveau_backlight *nv_bl = nv_connector->backlight;
166 struct drm_modeset_acquire_ctx ctx;
167 int ret = 0;
168
169 drm_modeset_acquire_init(&ctx, 0);
170retry:
171 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
172 if (ret == -EDEADLK)
173 goto deadlock;
174 else if (ret < 0)
175 goto out;
176
177 crtc = connector->state->crtc;
178 if (!crtc)
179 goto out;
180
181 ret = drm_modeset_lock(&crtc->mutex, &ctx);
182 if (ret == -EDEADLK)
183 goto deadlock;
184 else if (ret < 0)
185 goto out;
186
187 if (crtc->state->active)
188 ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
189
190out:
191 drm_modeset_drop_locks(&ctx);
192 drm_modeset_acquire_fini(&ctx);
193 return ret;
194deadlock:
195 drm_modeset_backoff(&ctx);
196 goto retry;
197}
198
199static const struct backlight_ops nv50_edp_bl_ops = {
200 .get_brightness = nv50_edp_get_brightness,
201 .update_status = nv50_edp_set_brightness,
202};
203
204static int
205nv50_get_intensity(struct backlight_device *bd)
206{
207 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
208
209 return nvif_outp_bl_get(&nv_encoder->outp);
210}
211
212static int
213nv50_set_intensity(struct backlight_device *bd)
214{
215 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
216
217 return nvif_outp_bl_set(&nv_encoder->outp, backlight_get_brightness(bd));
218}
219
220static const struct backlight_ops nv50_bl_ops = {
221 .options = BL_CORE_SUSPENDRESUME,
222 .get_brightness = nv50_get_intensity,
223 .update_status = nv50_set_intensity,
224};
225
226/* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
227 * registration which happens after the initial modeset
228 */
229static int
230nv50_backlight_init(struct nouveau_backlight *bl,
231 struct nouveau_connector *nv_conn,
232 struct nouveau_encoder *nv_encoder,
233 struct backlight_properties *props,
234 const struct backlight_ops **ops)
235{
236 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
237
238 /*
239 * Note when this runs the connectors have not been probed yet,
240 * so nv_conn->base.status is not set yet.
241 */
242 if (nvif_outp_bl_get(&nv_encoder->outp) < 0 ||
243 drm_helper_probe_detect(&nv_conn->base, NULL, false) != connector_status_connected)
244 return -ENODEV;
245
246 if (nv_conn->type == DCB_CONNECTOR_eDP) {
247 int ret;
248 u16 current_level;
249 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
250 u8 current_mode;
251
252 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
253 EDP_DISPLAY_CTL_CAP_SIZE);
254 if (ret < 0)
255 return ret;
256
257 /* TODO: Add support for hybrid PWM/DPCD panels */
258 if (drm_edp_backlight_supported(edp_dpcd) &&
259 (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
260 (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
261 NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
262 nv_conn->base.name);
263
264 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
265 ¤t_level, ¤t_mode);
266 if (ret < 0)
267 return ret;
268
269 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
270 if (ret < 0) {
271 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
272 nv_conn->base.name, ret);
273 return ret;
274 }
275
276 *ops = &nv50_edp_bl_ops;
277 props->brightness = current_level;
278 props->max_brightness = bl->edp_info.max;
279 bl->uses_dpcd = true;
280 return 0;
281 }
282 }
283
284 *ops = &nv50_bl_ops;
285 props->max_brightness = 100;
286 return 0;
287}
288
289int
290nouveau_backlight_init(struct drm_connector *connector)
291{
292 struct nouveau_drm *drm = nouveau_drm(connector->dev);
293 struct nouveau_backlight *bl;
294 struct nouveau_encoder *nv_encoder = NULL;
295 struct nvif_device *device = &drm->client.device;
296 char backlight_name[BL_NAME_SIZE];
297 struct backlight_properties props = {0};
298 const struct backlight_ops *ops;
299 int ret;
300
301 if (apple_gmux_present()) {
302 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
303 return 0;
304 }
305
306 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
307 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
308 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
309 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
310 else
311 return 0;
312
313 if (!nv_encoder)
314 return 0;
315
316 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
317 if (!bl)
318 return -ENOMEM;
319
320 switch (device->info.family) {
321 case NV_DEVICE_INFO_V0_CURIE:
322 ret = nv40_backlight_init(nv_encoder, &props, &ops);
323 break;
324 case NV_DEVICE_INFO_V0_TESLA:
325 case NV_DEVICE_INFO_V0_FERMI:
326 case NV_DEVICE_INFO_V0_KEPLER:
327 case NV_DEVICE_INFO_V0_MAXWELL:
328 case NV_DEVICE_INFO_V0_PASCAL:
329 case NV_DEVICE_INFO_V0_VOLTA:
330 case NV_DEVICE_INFO_V0_TURING:
331 case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed
332 ret = nv50_backlight_init(bl, nouveau_connector(connector),
333 nv_encoder, &props, &ops);
334 break;
335 default:
336 ret = 0;
337 goto fail_alloc;
338 }
339
340 if (ret) {
341 if (ret == -ENODEV)
342 ret = 0;
343 goto fail_alloc;
344 }
345
346 if (!nouveau_acpi_video_backlight_use_native()) {
347 NV_INFO(drm, "Skipping nv_backlight registration\n");
348 goto fail_alloc;
349 }
350
351 if (!nouveau_get_backlight_name(backlight_name, bl)) {
352 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
353 goto fail_alloc;
354 }
355
356 props.type = BACKLIGHT_RAW;
357 bl->dev = backlight_device_register(backlight_name, connector->kdev,
358 nv_encoder, ops, &props);
359 if (IS_ERR(bl->dev)) {
360 if (bl->id >= 0)
361 ida_free(&bl_ida, bl->id);
362 ret = PTR_ERR(bl->dev);
363 goto fail_alloc;
364 }
365
366 nouveau_connector(connector)->backlight = bl;
367 if (!bl->dev->props.brightness)
368 bl->dev->props.brightness =
369 bl->dev->ops->get_brightness(bl->dev);
370 backlight_update_status(bl->dev);
371
372 return 0;
373
374fail_alloc:
375 kfree(bl);
376 /*
377 * If we get here we have an internal panel, but no nv_backlight,
378 * try registering an ACPI video backlight device instead.
379 */
380 if (ret == 0)
381 nouveau_acpi_video_register_backlight();
382
383 return ret;
384}
385
386void
387nouveau_backlight_fini(struct drm_connector *connector)
388{
389 struct nouveau_connector *nv_conn = nouveau_connector(connector);
390 struct nouveau_backlight *bl = nv_conn->backlight;
391
392 if (!bl)
393 return;
394
395 if (bl->id >= 0)
396 ida_free(&bl_ida, bl->id);
397
398 backlight_device_unregister(bl->dev);
399 nv_conn->backlight = NULL;
400 kfree(bl);
401}
402
403void
404nouveau_backlight_ctor(void)
405{
406 ida_init(&bl_ida);
407}
408
409void
410nouveau_backlight_dtor(void)
411{
412 ida_destroy(&bl_ida);
413}
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#include "nouveau_acpi.h"
42
43static struct ida bl_ida;
44#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
45
46static bool
47nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
48 struct nouveau_backlight *bl)
49{
50 const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
51
52 if (nb < 0)
53 return false;
54 if (nb > 0)
55 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
56 else
57 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
58 bl->id = nb;
59 return true;
60}
61
62static int
63nv40_get_intensity(struct backlight_device *bd)
64{
65 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
66 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
67 struct nvif_object *device = &drm->client.device.object;
68 int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) &
69 NV40_PMC_BACKLIGHT_MASK) >> 16;
70
71 return val;
72}
73
74static int
75nv40_set_intensity(struct backlight_device *bd)
76{
77 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
78 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
79 struct nvif_object *device = &drm->client.device.object;
80 int val = bd->props.brightness;
81 int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT);
82
83 nvif_wr32(device, NV40_PMC_BACKLIGHT,
84 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
85
86 return 0;
87}
88
89static const struct backlight_ops nv40_bl_ops = {
90 .options = BL_CORE_SUSPENDRESUME,
91 .get_brightness = nv40_get_intensity,
92 .update_status = nv40_set_intensity,
93};
94
95static int
96nv40_backlight_init(struct nouveau_encoder *encoder,
97 struct backlight_properties *props,
98 const struct backlight_ops **ops)
99{
100 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
101 struct nvif_object *device = &drm->client.device.object;
102
103 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
104 return -ENODEV;
105
106 props->max_brightness = 31;
107 *ops = &nv40_bl_ops;
108 return 0;
109}
110
111static int
112nv50_get_intensity(struct backlight_device *bd)
113{
114 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
115 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
116 struct nvif_object *device = &drm->client.device.object;
117 int or = ffs(nv_encoder->dcb->or) - 1;
118 u32 div = 1025;
119 u32 val;
120
121 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
122 val &= NV50_PDISP_SOR_PWM_CTL_VAL;
123 return ((val * 100) + (div / 2)) / div;
124}
125
126static int
127nv50_set_intensity(struct backlight_device *bd)
128{
129 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
130 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
131 struct nvif_object *device = &drm->client.device.object;
132 int or = ffs(nv_encoder->dcb->or) - 1;
133 u32 div = 1025;
134 u32 val = (bd->props.brightness * div) / 100;
135
136 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
137 NV50_PDISP_SOR_PWM_CTL_NEW | val);
138 return 0;
139}
140
141static const struct backlight_ops nv50_bl_ops = {
142 .options = BL_CORE_SUSPENDRESUME,
143 .get_brightness = nv50_get_intensity,
144 .update_status = nv50_set_intensity,
145};
146
147/*
148 * eDP brightness callbacks need to happen under lock, since we need to
149 * enable/disable the backlight ourselves for modesets
150 */
151static int
152nv50_edp_get_brightness(struct backlight_device *bd)
153{
154 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
155 struct drm_device *dev = connector->dev;
156 struct drm_crtc *crtc;
157 struct drm_modeset_acquire_ctx ctx;
158 int ret = 0;
159
160 drm_modeset_acquire_init(&ctx, 0);
161
162retry:
163 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
164 if (ret == -EDEADLK)
165 goto deadlock;
166 else if (ret < 0)
167 goto out;
168
169 crtc = connector->state->crtc;
170 if (!crtc)
171 goto out;
172
173 ret = drm_modeset_lock(&crtc->mutex, &ctx);
174 if (ret == -EDEADLK)
175 goto deadlock;
176 else if (ret < 0)
177 goto out;
178
179 if (!crtc->state->active)
180 goto out;
181
182 ret = bd->props.brightness;
183out:
184 drm_modeset_drop_locks(&ctx);
185 drm_modeset_acquire_fini(&ctx);
186 return ret;
187deadlock:
188 drm_modeset_backoff(&ctx);
189 goto retry;
190}
191
192static int
193nv50_edp_set_brightness(struct backlight_device *bd)
194{
195 struct drm_connector *connector = dev_get_drvdata(bd->dev.parent);
196 struct nouveau_connector *nv_connector = nouveau_connector(connector);
197 struct drm_device *dev = connector->dev;
198 struct drm_crtc *crtc;
199 struct drm_dp_aux *aux = &nv_connector->aux;
200 struct nouveau_backlight *nv_bl = nv_connector->backlight;
201 struct drm_modeset_acquire_ctx ctx;
202 int ret = 0;
203
204 drm_modeset_acquire_init(&ctx, 0);
205retry:
206 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
207 if (ret == -EDEADLK)
208 goto deadlock;
209 else if (ret < 0)
210 goto out;
211
212 crtc = connector->state->crtc;
213 if (!crtc)
214 goto out;
215
216 ret = drm_modeset_lock(&crtc->mutex, &ctx);
217 if (ret == -EDEADLK)
218 goto deadlock;
219 else if (ret < 0)
220 goto out;
221
222 if (crtc->state->active)
223 ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
224
225out:
226 drm_modeset_drop_locks(&ctx);
227 drm_modeset_acquire_fini(&ctx);
228 return ret;
229deadlock:
230 drm_modeset_backoff(&ctx);
231 goto retry;
232}
233
234static const struct backlight_ops nv50_edp_bl_ops = {
235 .get_brightness = nv50_edp_get_brightness,
236 .update_status = nv50_edp_set_brightness,
237};
238
239static int
240nva3_get_intensity(struct backlight_device *bd)
241{
242 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
243 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
244 struct nvif_object *device = &drm->client.device.object;
245 int or = ffs(nv_encoder->dcb->or) - 1;
246 u32 div, val;
247
248 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
249 val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or));
250 val &= NVA3_PDISP_SOR_PWM_CTL_VAL;
251 if (div && div >= val)
252 return ((val * 100) + (div / 2)) / div;
253
254 return 100;
255}
256
257static int
258nva3_set_intensity(struct backlight_device *bd)
259{
260 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
261 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
262 struct nvif_object *device = &drm->client.device.object;
263 int or = ffs(nv_encoder->dcb->or) - 1;
264 u32 div, val;
265
266 div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or));
267
268 val = backlight_get_brightness(bd);
269 if (val)
270 val = (val * div) / 100;
271
272 if (div) {
273 nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or),
274 val |
275 NV50_PDISP_SOR_PWM_CTL_NEW |
276 NVA3_PDISP_SOR_PWM_CTL_UNK);
277 return 0;
278 }
279
280 return -EINVAL;
281}
282
283static const struct backlight_ops nva3_bl_ops = {
284 .options = BL_CORE_SUSPENDRESUME,
285 .get_brightness = nva3_get_intensity,
286 .update_status = nva3_set_intensity,
287};
288
289/* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
290 * registration which happens after the initial modeset
291 */
292static int
293nv50_backlight_init(struct nouveau_backlight *bl,
294 struct nouveau_connector *nv_conn,
295 struct nouveau_encoder *nv_encoder,
296 struct backlight_properties *props,
297 const struct backlight_ops **ops)
298{
299 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
300 struct nvif_object *device = &drm->client.device.object;
301
302 if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)) ||
303 nv_conn->base.status != connector_status_connected)
304 return -ENODEV;
305
306 if (nv_conn->type == DCB_CONNECTOR_eDP) {
307 int ret;
308 u16 current_level;
309 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
310 u8 current_mode;
311
312 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
313 EDP_DISPLAY_CTL_CAP_SIZE);
314 if (ret < 0)
315 return ret;
316
317 /* TODO: Add support for hybrid PWM/DPCD panels */
318 if (drm_edp_backlight_supported(edp_dpcd) &&
319 (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) &&
320 (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) {
321 NV_DEBUG(drm, "DPCD backlight controls supported on %s\n",
322 nv_conn->base.name);
323
324 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
325 ¤t_level, ¤t_mode);
326 if (ret < 0)
327 return ret;
328
329 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
330 if (ret < 0) {
331 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
332 nv_conn->base.name, ret);
333 return ret;
334 }
335
336 *ops = &nv50_edp_bl_ops;
337 props->brightness = current_level;
338 props->max_brightness = bl->edp_info.max;
339 bl->uses_dpcd = true;
340 return 0;
341 }
342 }
343
344 if (drm->client.device.info.chipset <= 0xa0 ||
345 drm->client.device.info.chipset == 0xaa ||
346 drm->client.device.info.chipset == 0xac)
347 *ops = &nv50_bl_ops;
348 else
349 *ops = &nva3_bl_ops;
350
351 props->max_brightness = 100;
352
353 return 0;
354}
355
356int
357nouveau_backlight_init(struct drm_connector *connector)
358{
359 struct nouveau_drm *drm = nouveau_drm(connector->dev);
360 struct nouveau_backlight *bl;
361 struct nouveau_encoder *nv_encoder = NULL;
362 struct nvif_device *device = &drm->client.device;
363 char backlight_name[BL_NAME_SIZE];
364 struct backlight_properties props = {0};
365 const struct backlight_ops *ops;
366 int ret;
367
368 if (apple_gmux_present()) {
369 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
370 return 0;
371 }
372
373 if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS)
374 nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS);
375 else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP)
376 nv_encoder = find_encoder(connector, DCB_OUTPUT_DP);
377 else
378 return 0;
379
380 if (!nv_encoder)
381 return 0;
382
383 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
384 if (!bl)
385 return -ENOMEM;
386
387 switch (device->info.family) {
388 case NV_DEVICE_INFO_V0_CURIE:
389 ret = nv40_backlight_init(nv_encoder, &props, &ops);
390 break;
391 case NV_DEVICE_INFO_V0_TESLA:
392 case NV_DEVICE_INFO_V0_FERMI:
393 case NV_DEVICE_INFO_V0_KEPLER:
394 case NV_DEVICE_INFO_V0_MAXWELL:
395 case NV_DEVICE_INFO_V0_PASCAL:
396 case NV_DEVICE_INFO_V0_VOLTA:
397 case NV_DEVICE_INFO_V0_TURING:
398 case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed
399 ret = nv50_backlight_init(bl, nouveau_connector(connector),
400 nv_encoder, &props, &ops);
401 break;
402 default:
403 ret = 0;
404 goto fail_alloc;
405 }
406
407 if (ret) {
408 if (ret == -ENODEV)
409 ret = 0;
410 goto fail_alloc;
411 }
412
413 if (!nouveau_acpi_video_backlight_use_native()) {
414 NV_INFO(drm, "Skipping nv_backlight registration\n");
415 goto fail_alloc;
416 }
417
418 if (!nouveau_get_backlight_name(backlight_name, bl)) {
419 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
420 goto fail_alloc;
421 }
422
423 props.type = BACKLIGHT_RAW;
424 bl->dev = backlight_device_register(backlight_name, connector->kdev,
425 nv_encoder, ops, &props);
426 if (IS_ERR(bl->dev)) {
427 if (bl->id >= 0)
428 ida_free(&bl_ida, bl->id);
429 ret = PTR_ERR(bl->dev);
430 goto fail_alloc;
431 }
432
433 nouveau_connector(connector)->backlight = bl;
434 if (!bl->dev->props.brightness)
435 bl->dev->props.brightness =
436 bl->dev->ops->get_brightness(bl->dev);
437 backlight_update_status(bl->dev);
438
439 return 0;
440
441fail_alloc:
442 kfree(bl);
443 /*
444 * If we get here we have an internal panel, but no nv_backlight,
445 * try registering an ACPI video backlight device instead.
446 */
447 if (ret == 0)
448 nouveau_acpi_video_register_backlight();
449
450 return ret;
451}
452
453void
454nouveau_backlight_fini(struct drm_connector *connector)
455{
456 struct nouveau_connector *nv_conn = nouveau_connector(connector);
457 struct nouveau_backlight *bl = nv_conn->backlight;
458
459 if (!bl)
460 return;
461
462 if (bl->id >= 0)
463 ida_free(&bl_ida, bl->id);
464
465 backlight_device_unregister(bl->dev);
466 nv_conn->backlight = NULL;
467 kfree(bl);
468}
469
470void
471nouveau_backlight_ctor(void)
472{
473 ida_init(&bl_ida);
474}
475
476void
477nouveau_backlight_dtor(void)
478{
479 ida_destroy(&bl_ida);
480}