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