Branch data Line data Source code
1 : : /*
2 : : * Copyright (c) 2016 Intel Corporation
3 : : *
4 : : * Permission to use, copy, modify, distribute, and sell this software and its
5 : : * documentation for any purpose is hereby granted without fee, provided that
6 : : * the above copyright notice appear in all copies and that both that copyright
7 : : * notice and this permission notice appear in supporting documentation, and
8 : : * that the name of the copyright holders not be used in advertising or
9 : : * publicity pertaining to distribution of the software without specific,
10 : : * written prior permission. The copyright holders make no representations
11 : : * about the suitability of this software for any purpose. It is provided "as
12 : : * is" without express or implied warranty.
13 : : *
14 : : * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
15 : : * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
16 : : * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
17 : : * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
18 : : * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
19 : : * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
20 : : * OF THIS SOFTWARE.
21 : : */
22 : :
23 : : #include <linux/export.h>
24 : :
25 : : #include <drm/drm_bridge.h>
26 : : #include <drm/drm_device.h>
27 : : #include <drm/drm_drv.h>
28 : : #include <drm/drm_encoder.h>
29 : :
30 : : #include "drm_crtc_internal.h"
31 : :
32 : : /**
33 : : * DOC: overview
34 : : *
35 : : * Encoders represent the connecting element between the CRTC (as the overall
36 : : * pixel pipeline, represented by &struct drm_crtc) and the connectors (as the
37 : : * generic sink entity, represented by &struct drm_connector). An encoder takes
38 : : * pixel data from a CRTC and converts it to a format suitable for any attached
39 : : * connector. Encoders are objects exposed to userspace, originally to allow
40 : : * userspace to infer cloning and connector/CRTC restrictions. Unfortunately
41 : : * almost all drivers get this wrong, making the uabi pretty much useless. On
42 : : * top of that the exposed restrictions are too simple for today's hardware, and
43 : : * the recommended way to infer restrictions is by using the
44 : : * DRM_MODE_ATOMIC_TEST_ONLY flag for the atomic IOCTL.
45 : : *
46 : : * Otherwise encoders aren't used in the uapi at all (any modeset request from
47 : : * userspace directly connects a connector with a CRTC), drivers are therefore
48 : : * free to use them however they wish. Modeset helper libraries make strong use
49 : : * of encoders to facilitate code sharing. But for more complex settings it is
50 : : * usually better to move shared code into a separate &drm_bridge. Compared to
51 : : * encoders, bridges also have the benefit of being purely an internal
52 : : * abstraction since they are not exposed to userspace at all.
53 : : *
54 : : * Encoders are initialized with drm_encoder_init() and cleaned up using
55 : : * drm_encoder_cleanup().
56 : : */
57 : : static const struct drm_prop_enum_list drm_encoder_enum_list[] = {
58 : : { DRM_MODE_ENCODER_NONE, "None" },
59 : : { DRM_MODE_ENCODER_DAC, "DAC" },
60 : : { DRM_MODE_ENCODER_TMDS, "TMDS" },
61 : : { DRM_MODE_ENCODER_LVDS, "LVDS" },
62 : : { DRM_MODE_ENCODER_TVDAC, "TV" },
63 : : { DRM_MODE_ENCODER_VIRTUAL, "Virtual" },
64 : : { DRM_MODE_ENCODER_DSI, "DSI" },
65 : : { DRM_MODE_ENCODER_DPMST, "DP MST" },
66 : : { DRM_MODE_ENCODER_DPI, "DPI" },
67 : : };
68 : :
69 : 0 : int drm_encoder_register_all(struct drm_device *dev)
70 : : {
71 : 0 : struct drm_encoder *encoder;
72 : 0 : int ret = 0;
73 : :
74 [ # # ]: 0 : drm_for_each_encoder(encoder, dev) {
75 [ # # ]: 0 : if (encoder->funcs->late_register)
76 : 0 : ret = encoder->funcs->late_register(encoder);
77 [ # # ]: 0 : if (ret)
78 : 0 : return ret;
79 : : }
80 : :
81 : : return 0;
82 : : }
83 : :
84 : 0 : void drm_encoder_unregister_all(struct drm_device *dev)
85 : : {
86 : 0 : struct drm_encoder *encoder;
87 : :
88 [ # # ]: 0 : drm_for_each_encoder(encoder, dev) {
89 [ # # ]: 0 : if (encoder->funcs->early_unregister)
90 : 0 : encoder->funcs->early_unregister(encoder);
91 : : }
92 : 0 : }
93 : :
94 : : /**
95 : : * drm_encoder_init - Init a preallocated encoder
96 : : * @dev: drm device
97 : : * @encoder: the encoder to init
98 : : * @funcs: callbacks for this encoder
99 : : * @encoder_type: user visible type of the encoder
100 : : * @name: printf style format string for the encoder name, or NULL for default name
101 : : *
102 : : * Initialises a preallocated encoder. Encoder should be subclassed as part of
103 : : * driver encoder objects. At driver unload time drm_encoder_cleanup() should be
104 : : * called from the driver's &drm_encoder_funcs.destroy hook.
105 : : *
106 : : * Returns:
107 : : * Zero on success, error code on failure.
108 : : */
109 : 0 : int drm_encoder_init(struct drm_device *dev,
110 : : struct drm_encoder *encoder,
111 : : const struct drm_encoder_funcs *funcs,
112 : : int encoder_type, const char *name, ...)
113 : : {
114 : 0 : int ret;
115 : :
116 : : /* encoder index is used with 32bit bitmasks */
117 [ # # # # ]: 0 : if (WARN_ON(dev->mode_config.num_encoder >= 32))
118 : : return -EINVAL;
119 : :
120 : 0 : ret = drm_mode_object_add(dev, &encoder->base, DRM_MODE_OBJECT_ENCODER);
121 [ # # ]: 0 : if (ret)
122 : : return ret;
123 : :
124 : 0 : encoder->dev = dev;
125 : 0 : encoder->encoder_type = encoder_type;
126 : 0 : encoder->funcs = funcs;
127 [ # # ]: 0 : if (name) {
128 : 0 : va_list ap;
129 : :
130 : 0 : va_start(ap, name);
131 : 0 : encoder->name = kvasprintf(GFP_KERNEL, name, ap);
132 : 0 : va_end(ap);
133 : : } else {
134 : 0 : encoder->name = kasprintf(GFP_KERNEL, "%s-%d",
135 : : drm_encoder_enum_list[encoder_type].name,
136 : : encoder->base.id);
137 : : }
138 [ # # ]: 0 : if (!encoder->name) {
139 : 0 : ret = -ENOMEM;
140 : 0 : goto out_put;
141 : : }
142 : :
143 : 0 : INIT_LIST_HEAD(&encoder->bridge_chain);
144 : 0 : list_add_tail(&encoder->head, &dev->mode_config.encoder_list);
145 : 0 : encoder->index = dev->mode_config.num_encoder++;
146 : :
147 : : out_put:
148 : 0 : if (ret)
149 : 0 : drm_mode_object_unregister(dev, &encoder->base);
150 : :
151 : : return ret;
152 : : }
153 : : EXPORT_SYMBOL(drm_encoder_init);
154 : :
155 : : /**
156 : : * drm_encoder_cleanup - cleans up an initialised encoder
157 : : * @encoder: encoder to cleanup
158 : : *
159 : : * Cleans up the encoder but doesn't free the object.
160 : : */
161 : 0 : void drm_encoder_cleanup(struct drm_encoder *encoder)
162 : : {
163 : 0 : struct drm_device *dev = encoder->dev;
164 : 0 : struct drm_bridge *bridge, *next;
165 : :
166 : : /* Note that the encoder_list is considered to be static; should we
167 : : * remove the drm_encoder at runtime we would have to decrement all
168 : : * the indices on the drm_encoder after us in the encoder_list.
169 : : */
170 : :
171 [ # # ]: 0 : list_for_each_entry_safe(bridge, next, &encoder->bridge_chain,
172 : : chain_node)
173 : 0 : drm_bridge_detach(bridge);
174 : :
175 : 0 : drm_mode_object_unregister(dev, &encoder->base);
176 : 0 : kfree(encoder->name);
177 : 0 : list_del(&encoder->head);
178 : 0 : dev->mode_config.num_encoder--;
179 : :
180 : 0 : memset(encoder, 0, sizeof(*encoder));
181 : 0 : }
182 : : EXPORT_SYMBOL(drm_encoder_cleanup);
183 : :
184 : 0 : static struct drm_crtc *drm_encoder_get_crtc(struct drm_encoder *encoder)
185 : : {
186 : 0 : struct drm_connector *connector;
187 : 0 : struct drm_device *dev = encoder->dev;
188 : 0 : bool uses_atomic = false;
189 : 0 : struct drm_connector_list_iter conn_iter;
190 : :
191 : : /* For atomic drivers only state objects are synchronously updated and
192 : : * protected by modeset locks, so check those first. */
193 : 0 : drm_connector_list_iter_begin(dev, &conn_iter);
194 [ # # ]: 0 : drm_for_each_connector_iter(connector, &conn_iter) {
195 [ # # ]: 0 : if (!connector->state)
196 : 0 : continue;
197 : :
198 : 0 : uses_atomic = true;
199 : :
200 [ # # ]: 0 : if (connector->state->best_encoder != encoder)
201 : 0 : continue;
202 : :
203 : 0 : drm_connector_list_iter_end(&conn_iter);
204 : 0 : return connector->state->crtc;
205 : : }
206 : 0 : drm_connector_list_iter_end(&conn_iter);
207 : :
208 : : /* Don't return stale data (e.g. pending async disable). */
209 [ # # ]: 0 : if (uses_atomic)
210 : : return NULL;
211 : :
212 : 0 : return encoder->crtc;
213 : : }
214 : :
215 : 0 : int drm_mode_getencoder(struct drm_device *dev, void *data,
216 : : struct drm_file *file_priv)
217 : : {
218 : 0 : struct drm_mode_get_encoder *enc_resp = data;
219 : 0 : struct drm_encoder *encoder;
220 : 0 : struct drm_crtc *crtc;
221 : :
222 [ # # ]: 0 : if (!drm_core_check_feature(dev, DRIVER_MODESET))
223 : : return -EOPNOTSUPP;
224 : :
225 : 0 : encoder = drm_encoder_find(dev, file_priv, enc_resp->encoder_id);
226 [ # # ]: 0 : if (!encoder)
227 : : return -ENOENT;
228 : :
229 : 0 : drm_modeset_lock(&dev->mode_config.connection_mutex, NULL);
230 : 0 : crtc = drm_encoder_get_crtc(encoder);
231 [ # # # # ]: 0 : if (crtc && drm_lease_held(file_priv, crtc->base.id))
232 : 0 : enc_resp->crtc_id = crtc->base.id;
233 : : else
234 : 0 : enc_resp->crtc_id = 0;
235 : 0 : drm_modeset_unlock(&dev->mode_config.connection_mutex);
236 : :
237 : 0 : enc_resp->encoder_type = encoder->encoder_type;
238 : 0 : enc_resp->encoder_id = encoder->base.id;
239 : 0 : enc_resp->possible_crtcs = drm_lease_filter_crtcs(file_priv,
240 : : encoder->possible_crtcs);
241 : 0 : enc_resp->possible_clones = encoder->possible_clones;
242 : :
243 : 0 : return 0;
244 : : }
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