2 * Copyright (C) 2009 Red Hat <mjg@redhat.com>
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:
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.
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.
28 * Matthew Garrett <mjg@redhat.com>
30 * Register locations derived from NVClock by Roderick Colenbrander
33 #include <linux/apple-gmux.h>
34 #include <linux/backlight.h>
35 #include <linux/idr.h>
36 #include <drm/drm_probe_helper.h>
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"
44 static struct ida bl_ida;
45 #define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0'
48 nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE],
49 struct nouveau_backlight *bl)
51 const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL);
56 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb);
58 snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight");
64 nv40_get_intensity(struct backlight_device *bd)
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;
76 nv40_set_intensity(struct backlight_device *bd)
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);
84 nvif_wr32(device, NV40_PMC_BACKLIGHT,
85 (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK));
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,
97 nv40_backlight_init(struct nouveau_encoder *encoder,
98 struct backlight_properties *props,
99 const struct backlight_ops **ops)
101 struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev);
102 struct nvif_object *device = &drm->client.device.object;
104 if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK))
107 props->max_brightness = 31;
113 * eDP brightness callbacks need to happen under lock, since we need to
114 * enable/disable the backlight ourselves for modesets
117 nv50_edp_get_brightness(struct backlight_device *bd)
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;
125 drm_modeset_acquire_init(&ctx, 0);
128 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
134 crtc = connector->state->crtc;
138 ret = drm_modeset_lock(&crtc->mutex, &ctx);
144 if (!crtc->state->active)
147 ret = bd->props.brightness;
149 drm_modeset_drop_locks(&ctx);
150 drm_modeset_acquire_fini(&ctx);
153 drm_modeset_backoff(&ctx);
158 nv50_edp_set_brightness(struct backlight_device *bd)
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;
169 drm_modeset_acquire_init(&ctx, 0);
171 ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
177 crtc = connector->state->crtc;
181 ret = drm_modeset_lock(&crtc->mutex, &ctx);
187 if (crtc->state->active)
188 ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness);
191 drm_modeset_drop_locks(&ctx);
192 drm_modeset_acquire_fini(&ctx);
195 drm_modeset_backoff(&ctx);
199 static const struct backlight_ops nv50_edp_bl_ops = {
200 .get_brightness = nv50_edp_get_brightness,
201 .update_status = nv50_edp_set_brightness,
205 nv50_get_intensity(struct backlight_device *bd)
207 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
209 return nvif_outp_bl_get(&nv_encoder->outp);
213 nv50_set_intensity(struct backlight_device *bd)
215 struct nouveau_encoder *nv_encoder = bl_get_data(bd);
217 return nvif_outp_bl_set(&nv_encoder->outp, backlight_get_brightness(bd));
220 static const struct backlight_ops nv50_bl_ops = {
221 .options = BL_CORE_SUSPENDRESUME,
222 .get_brightness = nv50_get_intensity,
223 .update_status = nv50_set_intensity,
226 /* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector
227 * registration which happens after the initial modeset
230 nv50_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)
236 struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev);
239 * Note when this runs the connectors have not been probed yet,
240 * so nv_conn->base.status is not set yet.
242 if (nvif_outp_bl_get(&nv_encoder->outp) < 0 ||
243 drm_helper_probe_detect(&nv_conn->base, NULL, false) != connector_status_connected)
246 if (nv_conn->type == DCB_CONNECTOR_eDP) {
249 u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE];
252 ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd,
253 EDP_DISPLAY_CTL_CAP_SIZE);
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",
264 ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd,
265 ¤t_level, ¤t_mode);
269 ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level);
271 NV_ERROR(drm, "Failed to enable backlight on %s: %d\n",
272 nv_conn->base.name, ret);
276 *ops = &nv50_edp_bl_ops;
277 props->brightness = current_level;
278 props->max_brightness = bl->edp_info.max;
279 bl->uses_dpcd = true;
285 props->max_brightness = 100;
290 nouveau_backlight_init(struct drm_connector *connector)
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;
301 if (apple_gmux_present()) {
302 NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n");
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);
316 bl = kzalloc(sizeof(*bl), GFP_KERNEL);
320 switch (device->info.family) {
321 case NV_DEVICE_INFO_V0_CURIE:
322 ret = nv40_backlight_init(nv_encoder, &props, &ops);
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);
346 if (!nouveau_acpi_video_backlight_use_native()) {
347 NV_INFO(drm, "Skipping nv_backlight registration\n");
351 if (!nouveau_get_backlight_name(backlight_name, bl)) {
352 NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n");
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)) {
361 ida_free(&bl_ida, bl->id);
362 ret = PTR_ERR(bl->dev);
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);
377 * If we get here we have an internal panel, but no nv_backlight,
378 * try registering an ACPI video backlight device instead.
381 nouveau_acpi_video_register_backlight();
387 nouveau_backlight_fini(struct drm_connector *connector)
389 struct nouveau_connector *nv_conn = nouveau_connector(connector);
390 struct nouveau_backlight *bl = nv_conn->backlight;
396 ida_free(&bl_ida, bl->id);
398 backlight_device_unregister(bl->dev);
399 nv_conn->backlight = NULL;
404 nouveau_backlight_ctor(void)
410 nouveau_backlight_dtor(void)
412 ida_destroy(&bl_ida);