| /* |
| * Copyright (c) 2016 Intel Corporation |
| * |
| * Permission to use, copy, modify, distribute, and sell this software and its |
| * documentation for any purpose is hereby granted without fee, provided that |
| * the above copyright notice appear in all copies and that both that copyright |
| * notice and this permission notice appear in supporting documentation, and |
| * that the name of the copyright holders not be used in advertising or |
| * publicity pertaining to distribution of the software without specific, |
| * written prior permission. The copyright holders make no representations |
| * about the suitability of this software for any purpose. It is provided "as |
| * is" without express or implied warranty. |
| * |
| * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE, |
| * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO |
| * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR |
| * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, |
| * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER |
| * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE |
| * OF THIS SOFTWARE. |
| */ |
| |
| #include <linux/export.h> |
| |
| #include <drm/drm_bridge.h> |
| #include <drm/drm_device.h> |
| #include <drm/drm_drv.h> |
| #include <drm/drm_encoder.h> |
| #include <drm/drm_managed.h> |
| |
| #include "drm_crtc_internal.h" |
| |
| /** |
| * DOC: overview |
| * |
| * Encoders represent the connecting element between the CRTC (as the overall |
| * pixel pipeline, represented by &struct drm_crtc) and the connectors (as the |
| * generic sink entity, represented by &struct drm_connector). An encoder takes |
| * pixel data from a CRTC and converts it to a format suitable for any attached |
| * connector. Encoders are objects exposed to userspace, originally to allow |
| * userspace to infer cloning and connector/CRTC restrictions. Unfortunately |
| * almost all drivers get this wrong, making the uabi pretty much useless. On |
| * top of that the exposed restrictions are too simple for today's hardware, and |
| * the recommended way to infer restrictions is by using the |
| * DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL. |
| * |
| * Otherwise encoders aren't used in the uapi at all (any modeset request from |
| * userspace directly connects a connector with a CRTC), drivers are therefore |
| * free to use them however they wish. Modeset helper libraries make strong use |
| * of encoders to facilitate code sharing. But for more complex settings it is |
| * usually better to move shared code into a separate &drm_bridge. Compared to |
| * encoders, bridges also have the benefit of being purely an internal |
| * abstraction since they are not exposed to userspace at all. |
| * |
| * Encoders are initialized with drm_encoder_init() and cleaned up using |
| * drm_encoder_cleanup(). |
| */ |
| static const struct drm_prop_enum_list drm_encoder_enum_list[] = { |
| { DRM_MODE_ENCODER_NONE, "None" }, |
| { DRM_MODE_ENCODER_DAC, "DAC" }, |
| { DRM_MODE_ENCODER_TMDS, "TMDS" }, |
| { DRM_MODE_ENCODER_LVDS, "LVDS" }, |
| { DRM_MODE_ENCODER_TVDAC, "TV" }, |
| { DRM_MODE_ENCODER_VIRTUAL, "Virtual" }, |
| { DRM_MODE_ENCODER_DSI, "DSI" }, |
| { DRM_MODE_ENCODER_DPMST, "DP MST" }, |
| { DRM_MODE_ENCODER_DPI, "DPI" }, |
| }; |
| |
| int drm_encoder_register_all(struct drm_device *dev) |
| { |
| struct drm_encoder *encoder; |
| int ret = 0; |
| |
| drm_for_each_encoder(encoder, dev) { |
| if (encoder->funcs && encoder->funcs->late_register) |
| ret = encoder->funcs->late_register(encoder); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| void drm_encoder_unregister_all(struct drm_device *dev) |
| { |
| struct drm_encoder *encoder; |
| |
| drm_for_each_encoder(encoder, dev) { |
| if (encoder->funcs && encoder->funcs->early_unregister) |
| encoder->funcs->early_unregister(encoder); |
| } |
| } |
| |
| __printf(5, 0) |
| static int __drm_encoder_init(struct drm_device *dev, |
| struct drm_encoder *encoder, |
| const struct drm_encoder_funcs *funcs, |
| int encoder_type, const char *name, va_list ap) |
| { |
| int ret; |
| |
| /* encoder index is used with 32bit bitmasks */ |
| if (WARN_ON(dev->mode_config.num_encoder >= 32)) |
| return -EINVAL; |
| |
| ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER); |
| if (ret) |
| return ret; |
| |
| encoder->dev = dev; |
| encoder->encoder_type = encoder_type; |
| encoder->funcs = funcs; |
| if (name) { |
| encoder->name = kvasprintf(GFP_KERNEL, name, ap); |
| } else { |
| encoder->name = kasprintf(GFP_KERNEL, "%s-%d", |
| drm_encoder_enum_list[encoder_type].name, |
| encoder->base.id); |
| } |
| if (!encoder->name) { |
| ret = -ENOMEM; |
| goto out_put; |
| } |
| |
| INIT_LIST_HEAD(&encoder->bridge_chain); |
| list_add_tail(&encoder->head, &dev->mode_config.encoder_list); |
| encoder->index = dev->mode_config.num_encoder++; |
| |
| out_put: |
| if (ret) |
| drm_mode_object_unregister(dev, &encoder->base); |
| |
| return ret; |
| } |
| |
| /** |
| * drm_encoder_init - Init a preallocated encoder |
| * @dev: drm device |
| * @encoder: the encoder to init |
| * @funcs: callbacks for this encoder |
| * @encoder_type: user visible type of the encoder |
| * @name: printf style format string for the encoder name, or NULL for default name |
| * |
| * Initializes a preallocated encoder. Encoder should be subclassed as part of |
| * driver encoder objects. At driver unload time the driver's |
| * &drm_encoder_funcs.destroy hook should call drm_encoder_cleanup() and kfree() |
| * the encoder structure. The encoder structure should not be allocated with |
| * devm_kzalloc(). |
| * |
| * Note: consider using drmm_encoder_alloc() instead of drm_encoder_init() to |
| * let the DRM managed resource infrastructure take care of cleanup and |
| * deallocation. |
| * |
| * Returns: |
| * Zero on success, error code on failure. |
| */ |
| int drm_encoder_init(struct drm_device *dev, |
| struct drm_encoder *encoder, |
| const struct drm_encoder_funcs *funcs, |
| int encoder_type, const char *name, ...) |
| { |
| va_list ap; |
| int ret; |
| |
| WARN_ON(!funcs->destroy); |
| |
| va_start(ap, name); |
| ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); |
| va_end(ap); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_encoder_init); |
| |
| /** |
| * drm_encoder_cleanup - cleans up an initialised encoder |
| * @encoder: encoder to cleanup |
| * |
| * Cleans up the encoder but doesn't free the object. |
| */ |
| void drm_encoder_cleanup(struct drm_encoder *encoder) |
| { |
| struct drm_device *dev = encoder->dev; |
| struct drm_bridge *bridge, *next; |
| |
| /* Note that the encoder_list is considered to be static; should we |
| * remove the drm_encoder at runtime we would have to decrement all |
| * the indices on the drm_encoder after us in the encoder_list. |
| */ |
| |
| list_for_each_entry_safe(bridge, next, &encoder->bridge_chain, |
| chain_node) |
| drm_bridge_detach(bridge); |
| |
| drm_mode_object_unregister(dev, &encoder->base); |
| kfree(encoder->name); |
| list_del(&encoder->head); |
| dev->mode_config.num_encoder--; |
| |
| memset(encoder, 0, sizeof(*encoder)); |
| } |
| EXPORT_SYMBOL(drm_encoder_cleanup); |
| |
| static void drmm_encoder_alloc_release(struct drm_device *dev, void *ptr) |
| { |
| struct drm_encoder *encoder = ptr; |
| |
| if (WARN_ON(!encoder->dev)) |
| return; |
| |
| drm_encoder_cleanup(encoder); |
| } |
| |
| void *__drmm_encoder_alloc(struct drm_device *dev, size_t size, size_t offset, |
| const struct drm_encoder_funcs *funcs, |
| int encoder_type, const char *name, ...) |
| { |
| void *container; |
| struct drm_encoder *encoder; |
| va_list ap; |
| int ret; |
| |
| if (WARN_ON(funcs && funcs->destroy)) |
| return ERR_PTR(-EINVAL); |
| |
| container = drmm_kzalloc(dev, size, GFP_KERNEL); |
| if (!container) |
| return ERR_PTR(-ENOMEM); |
| |
| encoder = container + offset; |
| |
| va_start(ap, name); |
| ret = __drm_encoder_init(dev, encoder, funcs, encoder_type, name, ap); |
| va_end(ap); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| ret = drmm_add_action_or_reset(dev, drmm_encoder_alloc_release, encoder); |
| if (ret) |
| return ERR_PTR(ret); |
| |
| return container; |
| } |
| EXPORT_SYMBOL(__drmm_encoder_alloc); |
| |
| static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder) |
| { |
| struct drm_connector *connector; |
| struct drm_device *dev = encoder->dev; |
| bool uses_atomic = false; |
| struct drm_connector_list_iter conn_iter; |
| |
| /* For atomic drivers only state objects are synchronously updated and |
| * protected by modeset locks, so check those first. */ |
| drm_connector_list_iter_begin(dev, &conn_iter); |
| drm_for_each_connector_iter(connector, &conn_iter) { |
| if (!connector->state) |
| continue; |
| |
| uses_atomic = true; |
| |
| if (connector->state->best_encoder != encoder) |
| continue; |
| |
| drm_connector_list_iter_end(&conn_iter); |
| return connector->state->crtc; |
| } |
| drm_connector_list_iter_end(&conn_iter); |
| |
| /* Don't return stale data (e.g. pending async disable). */ |
| if (uses_atomic) |
| return NULL; |
| |
| return encoder->crtc; |
| } |
| |
| int drm_mode_getencoder(struct drm_device *dev, void *data, |
| struct drm_file *file_priv) |
| { |
| struct drm_mode_get_encoder *enc_resp = data; |
| struct drm_encoder *encoder; |
| struct drm_crtc *crtc; |
| |
| if (!drm_core_check_feature(dev, DRIVER_MODESET)) |
| return -EOPNOTSUPP; |
| |
| encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id); |
| if (!encoder) |
| return -ENOENT; |
| |
| drm_modeset_lock(&dev->mode_config.connection_mutex, NULL); |
| crtc = drm_encoder_get_crtc(encoder); |
| if (crtc && drm_lease_held(file_priv, crtc->base.id)) |
| enc_resp->crtc_id = crtc->base.id; |
| else |
| enc_resp->crtc_id = 0; |
| drm_modeset_unlock(&dev->mode_config.connection_mutex); |
| |
| enc_resp->encoder_type = encoder->encoder_type; |
| enc_resp->encoder_id = encoder->base.id; |
| enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv, |
| encoder->possible_crtcs); |
| enc_resp->possible_clones = encoder->possible_clones; |
| |
| return 0; |
| } |