diff options
Diffstat (limited to 'drivers/gpu/drm/nouveau/nouveau_backlight.c')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_backlight.c | 476 |
1 files changed, 476 insertions, 0 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_backlight.c b/drivers/gpu/drm/nouveau/nouveau_backlight.c new file mode 100644 index 000000000..a61458277 --- /dev/null +++ b/drivers/gpu/drm/nouveau/nouveau_backlight.c @@ -0,0 +1,476 @@ +/* + * Copyright (C) 2009 Red Hat <mjg@redhat.com> + * + * Permission is hereby granted, free of charge, to any person obtaining + * a copy of this software and associated documentation files (the + * "Software"), to deal in the Software without restriction, including + * without limitation the rights to use, copy, modify, merge, publish, + * distribute, sublicense, and/or sell copies of the Software, and to + * permit persons to whom the Software is furnished to do so, subject to + * the following conditions: + * + * The above copyright notice and this permission notice (including the + * next paragraph) shall be included in all copies or substantial + * portions of the Software. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. + * IN NO EVENT SHALL THE COPYRIGHT OWNER(S) AND/OR ITS SUPPLIERS BE + * LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION + * OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION + * WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. + * + */ + +/* + * Authors: + * Matthew Garrett <mjg@redhat.com> + * + * Register locations derived from NVClock by Roderick Colenbrander + */ + +#include <linux/apple-gmux.h> +#include <linux/backlight.h> +#include <linux/idr.h> + +#include "nouveau_drv.h" +#include "nouveau_reg.h" +#include "nouveau_encoder.h" +#include "nouveau_connector.h" +#include "nouveau_acpi.h" + +static struct ida bl_ida; +#define BL_NAME_SIZE 15 // 12 for name + 2 for digits + 1 for '\0' + +static bool +nouveau_get_backlight_name(char backlight_name[BL_NAME_SIZE], + struct nouveau_backlight *bl) +{ + const int nb = ida_alloc_max(&bl_ida, 99, GFP_KERNEL); + + if (nb < 0) + return false; + if (nb > 0) + snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight%d", nb); + else + snprintf(backlight_name, BL_NAME_SIZE, "nv_backlight"); + bl->id = nb; + return true; +} + +static int +nv40_get_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int val = (nvif_rd32(device, NV40_PMC_BACKLIGHT) & + NV40_PMC_BACKLIGHT_MASK) >> 16; + + return val; +} + +static int +nv40_set_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int val = bd->props.brightness; + int reg = nvif_rd32(device, NV40_PMC_BACKLIGHT); + + nvif_wr32(device, NV40_PMC_BACKLIGHT, + (val << 16) | (reg & ~NV40_PMC_BACKLIGHT_MASK)); + + return 0; +} + +static const struct backlight_ops nv40_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = nv40_get_intensity, + .update_status = nv40_set_intensity, +}; + +static int +nv40_backlight_init(struct nouveau_encoder *encoder, + struct backlight_properties *props, + const struct backlight_ops **ops) +{ + struct nouveau_drm *drm = nouveau_drm(encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + + if (!(nvif_rd32(device, NV40_PMC_BACKLIGHT) & NV40_PMC_BACKLIGHT_MASK)) + return -ENODEV; + + props->max_brightness = 31; + *ops = &nv40_bl_ops; + return 0; +} + +static int +nv50_get_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int or = ffs(nv_encoder->dcb->or) - 1; + u32 div = 1025; + u32 val; + + val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); + val &= NV50_PDISP_SOR_PWM_CTL_VAL; + return ((val * 100) + (div / 2)) / div; +} + +static int +nv50_set_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int or = ffs(nv_encoder->dcb->or) - 1; + u32 div = 1025; + u32 val = (bd->props.brightness * div) / 100; + + nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), + NV50_PDISP_SOR_PWM_CTL_NEW | val); + return 0; +} + +static const struct backlight_ops nv50_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = nv50_get_intensity, + .update_status = nv50_set_intensity, +}; + +/* + * eDP brightness callbacks need to happen under lock, since we need to + * enable/disable the backlight ourselves for modesets + */ +static int +nv50_edp_get_brightness(struct backlight_device *bd) +{ + struct drm_connector *connector = dev_get_drvdata(bd->dev.parent); + struct drm_device *dev = connector->dev; + struct drm_crtc *crtc; + struct drm_modeset_acquire_ctx ctx; + int ret = 0; + + drm_modeset_acquire_init(&ctx, 0); + +retry: + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + crtc = connector->state->crtc; + if (!crtc) + goto out; + + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + if (!crtc->state->active) + goto out; + + ret = bd->props.brightness; +out: + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + return ret; +deadlock: + drm_modeset_backoff(&ctx); + goto retry; +} + +static int +nv50_edp_set_brightness(struct backlight_device *bd) +{ + struct drm_connector *connector = dev_get_drvdata(bd->dev.parent); + struct nouveau_connector *nv_connector = nouveau_connector(connector); + struct drm_device *dev = connector->dev; + struct drm_crtc *crtc; + struct drm_dp_aux *aux = &nv_connector->aux; + struct nouveau_backlight *nv_bl = nv_connector->backlight; + struct drm_modeset_acquire_ctx ctx; + int ret = 0; + + drm_modeset_acquire_init(&ctx, 0); +retry: + ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + crtc = connector->state->crtc; + if (!crtc) + goto out; + + ret = drm_modeset_lock(&crtc->mutex, &ctx); + if (ret == -EDEADLK) + goto deadlock; + else if (ret < 0) + goto out; + + if (crtc->state->active) + ret = drm_edp_backlight_set_level(aux, &nv_bl->edp_info, bd->props.brightness); + +out: + drm_modeset_drop_locks(&ctx); + drm_modeset_acquire_fini(&ctx); + return ret; +deadlock: + drm_modeset_backoff(&ctx); + goto retry; +} + +static const struct backlight_ops nv50_edp_bl_ops = { + .get_brightness = nv50_edp_get_brightness, + .update_status = nv50_edp_set_brightness, +}; + +static int +nva3_get_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int or = ffs(nv_encoder->dcb->or) - 1; + u32 div, val; + + div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); + val = nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(or)); + val &= NVA3_PDISP_SOR_PWM_CTL_VAL; + if (div && div >= val) + return ((val * 100) + (div / 2)) / div; + + return 100; +} + +static int +nva3_set_intensity(struct backlight_device *bd) +{ + struct nouveau_encoder *nv_encoder = bl_get_data(bd); + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + int or = ffs(nv_encoder->dcb->or) - 1; + u32 div, val; + + div = nvif_rd32(device, NV50_PDISP_SOR_PWM_DIV(or)); + val = (bd->props.brightness * div) / 100; + if (div) { + nvif_wr32(device, NV50_PDISP_SOR_PWM_CTL(or), + val | + NV50_PDISP_SOR_PWM_CTL_NEW | + NVA3_PDISP_SOR_PWM_CTL_UNK); + return 0; + } + + return -EINVAL; +} + +static const struct backlight_ops nva3_bl_ops = { + .options = BL_CORE_SUSPENDRESUME, + .get_brightness = nva3_get_intensity, + .update_status = nva3_set_intensity, +}; + +/* FIXME: perform backlight probing for eDP _before_ this, this only gets called after connector + * registration which happens after the initial modeset + */ +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) +{ + struct nouveau_drm *drm = nouveau_drm(nv_encoder->base.base.dev); + struct nvif_object *device = &drm->client.device.object; + + if (!nvif_rd32(device, NV50_PDISP_SOR_PWM_CTL(ffs(nv_encoder->dcb->or) - 1)) || + nv_conn->base.status != connector_status_connected) + return -ENODEV; + + if (nv_conn->type == DCB_CONNECTOR_eDP) { + int ret; + u16 current_level; + u8 edp_dpcd[EDP_DISPLAY_CTL_CAP_SIZE]; + u8 current_mode; + + ret = drm_dp_dpcd_read(&nv_conn->aux, DP_EDP_DPCD_REV, edp_dpcd, + EDP_DISPLAY_CTL_CAP_SIZE); + if (ret < 0) + return ret; + + /* TODO: Add support for hybrid PWM/DPCD panels */ + if (drm_edp_backlight_supported(edp_dpcd) && + (edp_dpcd[1] & DP_EDP_BACKLIGHT_AUX_ENABLE_CAP) && + (edp_dpcd[2] & DP_EDP_BACKLIGHT_BRIGHTNESS_AUX_SET_CAP)) { + NV_DEBUG(drm, "DPCD backlight controls supported on %s\n", + nv_conn->base.name); + + ret = drm_edp_backlight_init(&nv_conn->aux, &bl->edp_info, 0, edp_dpcd, + ¤t_level, ¤t_mode); + if (ret < 0) + return ret; + + ret = drm_edp_backlight_enable(&nv_conn->aux, &bl->edp_info, current_level); + if (ret < 0) { + NV_ERROR(drm, "Failed to enable backlight on %s: %d\n", + nv_conn->base.name, ret); + return ret; + } + + *ops = &nv50_edp_bl_ops; + props->brightness = current_level; + props->max_brightness = bl->edp_info.max; + bl->uses_dpcd = true; + return 0; + } + } + + if (drm->client.device.info.chipset <= 0xa0 || + drm->client.device.info.chipset == 0xaa || + drm->client.device.info.chipset == 0xac) + *ops = &nv50_bl_ops; + else + *ops = &nva3_bl_ops; + + props->max_brightness = 100; + + return 0; +} + +int +nouveau_backlight_init(struct drm_connector *connector) +{ + struct nouveau_drm *drm = nouveau_drm(connector->dev); + struct nouveau_backlight *bl; + struct nouveau_encoder *nv_encoder = NULL; + struct nvif_device *device = &drm->client.device; + char backlight_name[BL_NAME_SIZE]; + struct backlight_properties props = {0}; + const struct backlight_ops *ops; + int ret; + + if (apple_gmux_present()) { + NV_INFO_ONCE(drm, "Apple GMUX detected: not registering Nouveau backlight interface\n"); + return 0; + } + + if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS) + nv_encoder = find_encoder(connector, DCB_OUTPUT_LVDS); + else if (connector->connector_type == DRM_MODE_CONNECTOR_eDP) + nv_encoder = find_encoder(connector, DCB_OUTPUT_DP); + else + return 0; + + if (!nv_encoder) + return 0; + + bl = kzalloc(sizeof(*bl), GFP_KERNEL); + if (!bl) + return -ENOMEM; + + switch (device->info.family) { + case NV_DEVICE_INFO_V0_CURIE: + ret = nv40_backlight_init(nv_encoder, &props, &ops); + break; + case NV_DEVICE_INFO_V0_TESLA: + case NV_DEVICE_INFO_V0_FERMI: + case NV_DEVICE_INFO_V0_KEPLER: + case NV_DEVICE_INFO_V0_MAXWELL: + case NV_DEVICE_INFO_V0_PASCAL: + case NV_DEVICE_INFO_V0_VOLTA: + case NV_DEVICE_INFO_V0_TURING: + case NV_DEVICE_INFO_V0_AMPERE: //XXX: not confirmed + ret = nv50_backlight_init(bl, nouveau_connector(connector), + nv_encoder, &props, &ops); + break; + default: + ret = 0; + goto fail_alloc; + } + + if (ret) { + if (ret == -ENODEV) + ret = 0; + goto fail_alloc; + } + + if (!nouveau_acpi_video_backlight_use_native()) { + NV_INFO(drm, "Skipping nv_backlight registration\n"); + goto fail_alloc; + } + + if (!nouveau_get_backlight_name(backlight_name, bl)) { + NV_ERROR(drm, "Failed to retrieve a unique name for the backlight interface\n"); + goto fail_alloc; + } + + props.type = BACKLIGHT_RAW; + bl->dev = backlight_device_register(backlight_name, connector->kdev, + nv_encoder, ops, &props); + if (IS_ERR(bl->dev)) { + if (bl->id >= 0) + ida_free(&bl_ida, bl->id); + ret = PTR_ERR(bl->dev); + goto fail_alloc; + } + + nouveau_connector(connector)->backlight = bl; + if (!bl->dev->props.brightness) + bl->dev->props.brightness = + bl->dev->ops->get_brightness(bl->dev); + backlight_update_status(bl->dev); + + return 0; + +fail_alloc: + kfree(bl); + /* + * If we get here we have an internal panel, but no nv_backlight, + * try registering an ACPI video backlight device instead. + */ + if (ret == 0) + nouveau_acpi_video_register_backlight(); + + return ret; +} + +void +nouveau_backlight_fini(struct drm_connector *connector) +{ + struct nouveau_connector *nv_conn = nouveau_connector(connector); + struct nouveau_backlight *bl = nv_conn->backlight; + + if (!bl) + return; + + if (bl->id >= 0) + ida_free(&bl_ida, bl->id); + + backlight_device_unregister(bl->dev); + nv_conn->backlight = NULL; + kfree(bl); +} + +void +nouveau_backlight_ctor(void) +{ + ida_init(&bl_ida); +} + +void +nouveau_backlight_dtor(void) +{ + ida_destroy(&bl_ida); +} |