/* * 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_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->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->early_unregister)			encoder->funcs->early_unregister(encoder);	}} /** * 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 * * Initialises a preallocated encoder. Encoder should be subclassed as part of * driver encoder objects. At driver unload time drm_encoder_cleanup() should be * called from the driver's &drm_encoder_funcs.destroy hook. * * 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, ...){	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) {		va_list ap; 		va_start(ap, name);		encoder->name = kvasprintf(GFP_KERNEL, name, ap);		va_end(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;}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 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;}