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authorDaniel Vetter <daniel.vetter@ffwll.ch>2014-04-10 04:51:11 -0400
committerDave Airlie <airlied@redhat.com>2014-04-17 23:21:17 -0400
commit8d754544202c0e4ef02e9c1abdf379bcf7ef9384 (patch)
tree9642efef9e6e223ebd8d6754fdfa2f5d30ce7b4f
parentb6ccd7b9873dc46becd11838c885d5c783784156 (diff)
drm: Split out drm_probe_helper.c from drm_crtc_helper.c
This is leftover stuff from my previous doc round which I kinda wanted to do but didn't yet due to rebase hell. The modeset helpers and the probing helpers a independent and e.g. i915 uses the probing stuff but has its own modeset infrastructure. It hence makes to split this up. While at it add a DOC: comment for the probing libraray. It would be rather neat to pull some of the DocBook documenting these two helpers into in-line DOC: comments. But unfortunately kerneldoc doesn't support markdown or something similar to make nice-looking documentation, so the current state is better. Signed-off-by: Daniel Vetter <daniel.vetter@ffwll.ch> Signed-off-by: Dave Airlie <airlied@redhat.com>
Diffstat
-rw-r--r--Documentation/DocBook/drm.tmpl5
-rw-r--r--drivers/gpu/drm/Makefile2
-rw-r--r--drivers/gpu/drm/drm_crtc_helper.c370
-rw-r--r--drivers/gpu/drm/drm_probe_helper.c426
-rw-r--r--include/drm/drm_crtc_helper.h6
5 files changed, 437 insertions, 372 deletions
diff --git a/Documentation/DocBook/drm.tmpl b/Documentation/DocBook/drm.tmpl
index 702c4474919c..677a02553ec0 100644
--- a/Documentation/DocBook/drm.tmpl
+++ b/Documentation/DocBook/drm.tmpl
@@ -2287,6 +2287,11 @@ void intel_crt_init(struct drm_device *dev)
2287!Edrivers/gpu/drm/drm_crtc_helper.c 2287!Edrivers/gpu/drm/drm_crtc_helper.c
2288 </sect2> 2288 </sect2>
2289 <sect2> 2289 <sect2>
2290 <title>Output Probing Helper Functions Reference</title>
2291!Pdrivers/gpu/drm/drm_probe_helper.c output probing helper overview
2292!Edrivers/gpu/drm/drm_probe_helper.c
2293 </sect2>
2294 <sect2>
2290 <title>fbdev Helper Functions Reference</title> 2295 <title>fbdev Helper Functions Reference</title>
2291!Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers 2296!Pdrivers/gpu/drm/drm_fb_helper.c fbdev helpers
2292!Edrivers/gpu/drm/drm_fb_helper.c 2297!Edrivers/gpu/drm/drm_fb_helper.c
diff --git a/drivers/gpu/drm/Makefile b/drivers/gpu/drm/Makefile
index 9d25dbbe6771..48e38ba22783 100644
--- a/drivers/gpu/drm/Makefile
+++ b/drivers/gpu/drm/Makefile
@@ -23,7 +23,7 @@ drm-$(CONFIG_DRM_PANEL) += drm_panel.o
23 23
24drm-usb-y := drm_usb.o 24drm-usb-y := drm_usb.o
25 25
26drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o 26drm_kms_helper-y := drm_crtc_helper.o drm_dp_helper.o drm_probe_helper.o
27drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o 27drm_kms_helper-$(CONFIG_DRM_LOAD_EDID_FIRMWARE) += drm_edid_load.o
28drm_kms_helper-$(CONFIG_DRM_KMS_FB_HELPER) += drm_fb_helper.o 28drm_kms_helper-$(CONFIG_DRM_KMS_FB_HELPER) += drm_fb_helper.o
29drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o 29drm_kms_helper-$(CONFIG_DRM_KMS_CMA_HELPER) += drm_fb_cma_helper.o
diff --git a/drivers/gpu/drm/drm_crtc_helper.c b/drivers/gpu/drm/drm_crtc_helper.c
index c43825e8f5c1..df281b54db01 100644
--- a/drivers/gpu/drm/drm_crtc_helper.c
+++ b/drivers/gpu/drm/drm_crtc_helper.c
@@ -72,147 +72,6 @@ void drm_helper_move_panel_connectors_to_head(struct drm_device *dev)
72} 72}
73EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); 73EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head);
74 74
75static bool drm_kms_helper_poll = true;
76module_param_named(poll, drm_kms_helper_poll, bool, 0600);
77
78static void drm_mode_validate_flag(struct drm_connector *connector,
79 int flags)
80{
81 struct drm_display_mode *mode;
82
83 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
84 DRM_MODE_FLAG_3D_MASK))
85 return;
86
87 list_for_each_entry(mode, &connector->modes, head) {
88 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
89 !(flags & DRM_MODE_FLAG_INTERLACE))
90 mode->status = MODE_NO_INTERLACE;
91 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
92 !(flags & DRM_MODE_FLAG_DBLSCAN))
93 mode->status = MODE_NO_DBLESCAN;
94 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
95 !(flags & DRM_MODE_FLAG_3D_MASK))
96 mode->status = MODE_NO_STEREO;
97 }
98
99 return;
100}
101
102/**
103 * drm_helper_probe_single_connector_modes - get complete set of display modes
104 * @connector: connector to probe
105 * @maxX: max width for modes
106 * @maxY: max height for modes
107 *
108 * Based on the helper callbacks implemented by @connector try to detect all
109 * valid modes. Modes will first be added to the connector's probed_modes list,
110 * then culled (based on validity and the @maxX, @maxY parameters) and put into
111 * the normal modes list.
112 *
113 * Intended to be use as a generic implementation of the ->fill_modes()
114 * @connector vfunc for drivers that use the crtc helpers for output mode
115 * filtering and detection.
116 *
117 * Returns:
118 * The number of modes found on @connector.
119 */
120int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
121 uint32_t maxX, uint32_t maxY)
122{
123 struct drm_device *dev = connector->dev;
124 struct drm_display_mode *mode;
125 struct drm_connector_helper_funcs *connector_funcs =
126 connector->helper_private;
127 int count = 0;
128 int mode_flags = 0;
129 bool verbose_prune = true;
130
131 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
132
133 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
134 drm_get_connector_name(connector));
135 /* set all modes to the unverified state */
136 list_for_each_entry(mode, &connector->modes, head)
137 mode->status = MODE_UNVERIFIED;
138
139 if (connector->force) {
140 if (connector->force == DRM_FORCE_ON)
141 connector->status = connector_status_connected;
142 else
143 connector->status = connector_status_disconnected;
144 if (connector->funcs->force)
145 connector->funcs->force(connector);
146 } else {
147 connector->status = connector->funcs->detect(connector, true);
148 }
149
150 /* Re-enable polling in case the global poll config changed. */
151 if (drm_kms_helper_poll != dev->mode_config.poll_running)
152 drm_kms_helper_poll_enable(dev);
153
154 dev->mode_config.poll_running = drm_kms_helper_poll;
155
156 if (connector->status == connector_status_disconnected) {
157 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
158 connector->base.id, drm_get_connector_name(connector));
159 drm_mode_connector_update_edid_property(connector, NULL);
160 verbose_prune = false;
161 goto prune;
162 }
163
164#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
165 count = drm_load_edid_firmware(connector);
166 if (count == 0)
167#endif
168 count = (*connector_funcs->get_modes)(connector);
169
170 if (count == 0 && connector->status == connector_status_connected)
171 count = drm_add_modes_noedid(connector, 1024, 768);
172 if (count == 0)
173 goto prune;
174
175 drm_mode_connector_list_update(connector);
176
177 if (maxX && maxY)
178 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
179
180 if (connector->interlace_allowed)
181 mode_flags |= DRM_MODE_FLAG_INTERLACE;
182 if (connector->doublescan_allowed)
183 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
184 if (connector->stereo_allowed)
185 mode_flags |= DRM_MODE_FLAG_3D_MASK;
186 drm_mode_validate_flag(connector, mode_flags);
187
188 list_for_each_entry(mode, &connector->modes, head) {
189 if (mode->status == MODE_OK)
190 mode->status = connector_funcs->mode_valid(connector,
191 mode);
192 }
193
194prune:
195 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
196
197 if (list_empty(&connector->modes))
198 return 0;
199
200 list_for_each_entry(mode, &connector->modes, head)
201 mode->vrefresh = drm_mode_vrefresh(mode);
202
203 drm_mode_sort(&connector->modes);
204
205 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
206 drm_get_connector_name(connector));
207 list_for_each_entry(mode, &connector->modes, head) {
208 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
209 drm_mode_debug_printmodeline(mode);
210 }
211
212 return count;
213}
214EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
215
216/** 75/**
217 * drm_helper_encoder_in_use - check if a given encoder is in use 76 * drm_helper_encoder_in_use - check if a given encoder is in use
218 * @encoder: encoder to check 77 * @encoder: encoder to check
@@ -1020,232 +879,3 @@ void drm_helper_resume_force_mode(struct drm_device *dev)
1020 drm_modeset_unlock_all(dev); 879 drm_modeset_unlock_all(dev);
1021} 880}
1022EXPORT_SYMBOL(drm_helper_resume_force_mode); 881EXPORT_SYMBOL(drm_helper_resume_force_mode);
1023
1024/**
1025 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
1026 * @dev: drm_device whose connector state changed
1027 *
1028 * This function fires off the uevent for userspace and also calls the
1029 * output_poll_changed function, which is most commonly used to inform the fbdev
1030 * emulation code and allow it to update the fbcon output configuration.
1031 *
1032 * Drivers should call this from their hotplug handling code when a change is
1033 * detected. Note that this function does not do any output detection of its
1034 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
1035 * driver already.
1036 *
1037 * This function must be called from process context with no mode
1038 * setting locks held.
1039 */
1040void drm_kms_helper_hotplug_event(struct drm_device *dev)
1041{
1042 /* send a uevent + call fbdev */
1043 drm_sysfs_hotplug_event(dev);
1044 if (dev->mode_config.funcs->output_poll_changed)
1045 dev->mode_config.funcs->output_poll_changed(dev);
1046}
1047EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
1048
1049#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
1050static void output_poll_execute(struct work_struct *work)
1051{
1052 struct delayed_work *delayed_work = to_delayed_work(work);
1053 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
1054 struct drm_connector *connector;
1055 enum drm_connector_status old_status;
1056 bool repoll = false, changed = false;
1057
1058 if (!drm_kms_helper_poll)
1059 return;
1060
1061 mutex_lock(&dev->mode_config.mutex);
1062 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1063
1064 /* Ignore forced connectors. */
1065 if (connector->force)
1066 continue;
1067
1068 /* Ignore HPD capable connectors and connectors where we don't
1069 * want any hotplug detection at all for polling. */
1070 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
1071 continue;
1072
1073 repoll = true;
1074
1075 old_status = connector->status;
1076 /* if we are connected and don't want to poll for disconnect
1077 skip it */
1078 if (old_status == connector_status_connected &&
1079 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
1080 continue;
1081
1082 connector->status = connector->funcs->detect(connector, false);
1083 if (old_status != connector->status) {
1084 const char *old, *new;
1085
1086 old = drm_get_connector_status_name(old_status);
1087 new = drm_get_connector_status_name(connector->status);
1088
1089 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
1090 "status updated from %s to %s\n",
1091 connector->base.id,
1092 drm_get_connector_name(connector),
1093 old, new);
1094
1095 changed = true;
1096 }
1097 }
1098
1099 mutex_unlock(&dev->mode_config.mutex);
1100
1101 if (changed)
1102 drm_kms_helper_hotplug_event(dev);
1103
1104 if (repoll)
1105 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
1106}
1107
1108/**
1109 * drm_kms_helper_poll_disable - disable output polling
1110 * @dev: drm_device
1111 *
1112 * This function disables the output polling work.
1113 *
1114 * Drivers can call this helper from their device suspend implementation. It is
1115 * not an error to call this even when output polling isn't enabled or arlready
1116 * disabled.
1117 */
1118void drm_kms_helper_poll_disable(struct drm_device *dev)
1119{
1120 if (!dev->mode_config.poll_enabled)
1121 return;
1122 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
1123}
1124EXPORT_SYMBOL(drm_kms_helper_poll_disable);
1125
1126/**
1127 * drm_kms_helper_poll_enable - re-enable output polling.
1128 * @dev: drm_device
1129 *
1130 * This function re-enables the output polling work.
1131 *
1132 * Drivers can call this helper from their device resume implementation. It is
1133 * an error to call this when the output polling support has not yet been set
1134 * up.
1135 */
1136void drm_kms_helper_poll_enable(struct drm_device *dev)
1137{
1138 bool poll = false;
1139 struct drm_connector *connector;
1140
1141 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
1142 return;
1143
1144 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1145 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
1146 DRM_CONNECTOR_POLL_DISCONNECT))
1147 poll = true;
1148 }
1149
1150 if (poll)
1151 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
1152}
1153EXPORT_SYMBOL(drm_kms_helper_poll_enable);
1154
1155/**
1156 * drm_kms_helper_poll_init - initialize and enable output polling
1157 * @dev: drm_device
1158 *
1159 * This function intializes and then also enables output polling support for
1160 * @dev. Drivers which do not have reliable hotplug support in hardware can use
1161 * this helper infrastructure to regularly poll such connectors for changes in
1162 * their connection state.
1163 *
1164 * Drivers can control which connectors are polled by setting the
1165 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
1166 * connectors where probing live outputs can result in visual distortion drivers
1167 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
1168 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
1169 * completely ignored by the polling logic.
1170 *
1171 * Note that a connector can be both polled and probed from the hotplug handler,
1172 * in case the hotplug interrupt is known to be unreliable.
1173 */
1174void drm_kms_helper_poll_init(struct drm_device *dev)
1175{
1176 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
1177 dev->mode_config.poll_enabled = true;
1178
1179 drm_kms_helper_poll_enable(dev);
1180}
1181EXPORT_SYMBOL(drm_kms_helper_poll_init);
1182
1183/**
1184 * drm_kms_helper_poll_fini - disable output polling and clean it up
1185 * @dev: drm_device
1186 */
1187void drm_kms_helper_poll_fini(struct drm_device *dev)
1188{
1189 drm_kms_helper_poll_disable(dev);
1190}
1191EXPORT_SYMBOL(drm_kms_helper_poll_fini);
1192
1193/**
1194 * drm_helper_hpd_irq_event - hotplug processing
1195 * @dev: drm_device
1196 *
1197 * Drivers can use this helper function to run a detect cycle on all connectors
1198 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
1199 * other connectors are ignored, which is useful to avoid reprobing fixed
1200 * panels.
1201 *
1202 * This helper function is useful for drivers which can't or don't track hotplug
1203 * interrupts for each connector.
1204 *
1205 * Drivers which support hotplug interrupts for each connector individually and
1206 * which have a more fine-grained detect logic should bypass this code and
1207 * directly call drm_kms_helper_hotplug_event() in case the connector state
1208 * changed.
1209 *
1210 * This function must be called from process context with no mode
1211 * setting locks held.
1212 *
1213 * Note that a connector can be both polled and probed from the hotplug handler,
1214 * in case the hotplug interrupt is known to be unreliable.
1215 */
1216bool drm_helper_hpd_irq_event(struct drm_device *dev)
1217{
1218 struct drm_connector *connector;
1219 enum drm_connector_status old_status;
1220 bool changed = false;
1221
1222 if (!dev->mode_config.poll_enabled)
1223 return false;
1224
1225 mutex_lock(&dev->mode_config.mutex);
1226 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
1227
1228 /* Only handle HPD capable connectors. */
1229 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
1230 continue;
1231
1232 old_status = connector->status;
1233
1234 connector->status = connector->funcs->detect(connector, false);
1235 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
1236 connector->base.id,
1237 drm_get_connector_name(connector),
1238 drm_get_connector_status_name(old_status),
1239 drm_get_connector_status_name(connector->status));
1240 if (old_status != connector->status)
1241 changed = true;
1242 }
1243
1244 mutex_unlock(&dev->mode_config.mutex);
1245
1246 if (changed)
1247 drm_kms_helper_hotplug_event(dev);
1248
1249 return changed;
1250}
1251EXPORT_SYMBOL(drm_helper_hpd_irq_event);
diff --git a/drivers/gpu/drm/drm_probe_helper.c b/drivers/gpu/drm/drm_probe_helper.c
new file mode 100644
index 000000000000..e70f54d4a581
--- /dev/null
+++ b/drivers/gpu/drm/drm_probe_helper.c
@@ -0,0 +1,426 @@
1/*
2 * Copyright (c) 2006-2008 Intel Corporation
3 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
4 *
5 * DRM core CRTC related functions
6 *
7 * Permission to use, copy, modify, distribute, and sell this software and its
8 * documentation for any purpose is hereby granted without fee, provided that
9 * the above copyright notice appear in all copies and that both that copyright
10 * notice and this permission notice appear in supporting documentation, and
11 * that the name of the copyright holders not be used in advertising or
12 * publicity pertaining to distribution of the software without specific,
13 * written prior permission. The copyright holders make no representations
14 * about the suitability of this software for any purpose. It is provided "as
15 * is" without express or implied warranty.
16 *
17 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
18 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
19 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
20 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
21 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
22 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
23 * OF THIS SOFTWARE.
24 *
25 * Authors:
26 * Keith Packard
27 * Eric Anholt <eric@anholt.net>
28 * Dave Airlie <airlied@linux.ie>
29 * Jesse Barnes <jesse.barnes@intel.com>
30 */
31
32#include <linux/export.h>
33#include <linux/moduleparam.h>
34
35#include <drm/drmP.h>
36#include <drm/drm_crtc.h>
37#include <drm/drm_fourcc.h>
38#include <drm/drm_crtc_helper.h>
39#include <drm/drm_fb_helper.h>
40#include <drm/drm_edid.h>
41
42/**
43 * DOC: output probing helper overview
44 *
45 * This library provides some helper code for output probing. It provides an
46 * implementation of the core connector->fill_modes interface with
47 * drm_helper_probe_single_connector_modes.
48 *
49 * It also provides support for polling connectors with a work item and for
50 * generic hotplug interrupt handling where the driver doesn't or cannot keep
51 * track of a per-connector hpd interrupt.
52 *
53 * This helper library can be used independently of the modeset helper library.
54 * Drivers can also overwrite different parts e.g. use their own hotplug
55 * handling code to avoid probing unrelated outputs.
56 */
57
58static bool drm_kms_helper_poll = true;
59module_param_named(poll, drm_kms_helper_poll, bool, 0600);
60
61static void drm_mode_validate_flag(struct drm_connector *connector,
62 int flags)
63{
64 struct drm_display_mode *mode;
65
66 if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
67 DRM_MODE_FLAG_3D_MASK))
68 return;
69
70 list_for_each_entry(mode, &connector->modes, head) {
71 if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
72 !(flags & DRM_MODE_FLAG_INTERLACE))
73 mode->status = MODE_NO_INTERLACE;
74 if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
75 !(flags & DRM_MODE_FLAG_DBLSCAN))
76 mode->status = MODE_NO_DBLESCAN;
77 if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
78 !(flags & DRM_MODE_FLAG_3D_MASK))
79 mode->status = MODE_NO_STEREO;
80 }
81
82 return;
83}
84
85/**
86 * drm_helper_probe_single_connector_modes - get complete set of display modes
87 * @connector: connector to probe
88 * @maxX: max width for modes
89 * @maxY: max height for modes
90 *
91 * Based on the helper callbacks implemented by @connector try to detect all
92 * valid modes. Modes will first be added to the connector's probed_modes list,
93 * then culled (based on validity and the @maxX, @maxY parameters) and put into
94 * the normal modes list.
95 *
96 * Intended to be use as a generic implementation of the ->fill_modes()
97 * @connector vfunc for drivers that use the crtc helpers for output mode
98 * filtering and detection.
99 *
100 * Returns:
101 * The number of modes found on @connector.
102 */
103int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
104 uint32_t maxX, uint32_t maxY)
105{
106 struct drm_device *dev = connector->dev;
107 struct drm_display_mode *mode;
108 struct drm_connector_helper_funcs *connector_funcs =
109 connector->helper_private;
110 int count = 0;
111 int mode_flags = 0;
112 bool verbose_prune = true;
113
114 WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
115
116 DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
117 drm_get_connector_name(connector));
118 /* set all modes to the unverified state */
119 list_for_each_entry(mode, &connector->modes, head)
120 mode->status = MODE_UNVERIFIED;
121
122 if (connector->force) {
123 if (connector->force == DRM_FORCE_ON)
124 connector->status = connector_status_connected;
125 else
126 connector->status = connector_status_disconnected;
127 if (connector->funcs->force)
128 connector->funcs->force(connector);
129 } else {
130 connector->status = connector->funcs->detect(connector, true);
131 }
132
133 /* Re-enable polling in case the global poll config changed. */
134 if (drm_kms_helper_poll != dev->mode_config.poll_running)
135 drm_kms_helper_poll_enable(dev);
136
137 dev->mode_config.poll_running = drm_kms_helper_poll;
138
139 if (connector->status == connector_status_disconnected) {
140 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
141 connector->base.id, drm_get_connector_name(connector));
142 drm_mode_connector_update_edid_property(connector, NULL);
143 verbose_prune = false;
144 goto prune;
145 }
146
147#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
148 count = drm_load_edid_firmware(connector);
149 if (count == 0)
150#endif
151 count = (*connector_funcs->get_modes)(connector);
152
153 if (count == 0 && connector->status == connector_status_connected)
154 count = drm_add_modes_noedid(connector, 1024, 768);
155 if (count == 0)
156 goto prune;
157
158 drm_mode_connector_list_update(connector);
159
160 if (maxX && maxY)
161 drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
162
163 if (connector->interlace_allowed)
164 mode_flags |= DRM_MODE_FLAG_INTERLACE;
165 if (connector->doublescan_allowed)
166 mode_flags |= DRM_MODE_FLAG_DBLSCAN;
167 if (connector->stereo_allowed)
168 mode_flags |= DRM_MODE_FLAG_3D_MASK;
169 drm_mode_validate_flag(connector, mode_flags);
170
171 list_for_each_entry(mode, &connector->modes, head) {
172 if (mode->status == MODE_OK)
173 mode->status = connector_funcs->mode_valid(connector,
174 mode);
175 }
176
177prune:
178 drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
179
180 if (list_empty(&connector->modes))
181 return 0;
182
183 list_for_each_entry(mode, &connector->modes, head)
184 mode->vrefresh = drm_mode_vrefresh(mode);
185
186 drm_mode_sort(&connector->modes);
187
188 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
189 drm_get_connector_name(connector));
190 list_for_each_entry(mode, &connector->modes, head) {
191 drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
192 drm_mode_debug_printmodeline(mode);
193 }
194
195 return count;
196}
197EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
198
199/**
200 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
201 * @dev: drm_device whose connector state changed
202 *
203 * This function fires off the uevent for userspace and also calls the
204 * output_poll_changed function, which is most commonly used to inform the fbdev
205 * emulation code and allow it to update the fbcon output configuration.
206 *
207 * Drivers should call this from their hotplug handling code when a change is
208 * detected. Note that this function does not do any output detection of its
209 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
210 * driver already.
211 *
212 * This function must be called from process context with no mode
213 * setting locks held.
214 */
215void drm_kms_helper_hotplug_event(struct drm_device *dev)
216{
217 /* send a uevent + call fbdev */
218 drm_sysfs_hotplug_event(dev);
219 if (dev->mode_config.funcs->output_poll_changed)
220 dev->mode_config.funcs->output_poll_changed(dev);
221}
222EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
223
224#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
225static void output_poll_execute(struct work_struct *work)
226{
227 struct delayed_work *delayed_work = to_delayed_work(work);
228 struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
229 struct drm_connector *connector;
230 enum drm_connector_status old_status;
231 bool repoll = false, changed = false;
232
233 if (!drm_kms_helper_poll)
234 return;
235
236 mutex_lock(&dev->mode_config.mutex);
237 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
238
239 /* Ignore forced connectors. */
240 if (connector->force)
241 continue;
242
243 /* Ignore HPD capable connectors and connectors where we don't
244 * want any hotplug detection at all for polling. */
245 if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
246 continue;
247
248 repoll = true;
249
250 old_status = connector->status;
251 /* if we are connected and don't want to poll for disconnect
252 skip it */
253 if (old_status == connector_status_connected &&
254 !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
255 continue;
256
257 connector->status = connector->funcs->detect(connector, false);
258 if (old_status != connector->status) {
259 const char *old, *new;
260
261 old = drm_get_connector_status_name(old_status);
262 new = drm_get_connector_status_name(connector->status);
263
264 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
265 "status updated from %s to %s\n",
266 connector->base.id,
267 drm_get_connector_name(connector),
268 old, new);
269
270 changed = true;
271 }
272 }
273
274 mutex_unlock(&dev->mode_config.mutex);
275
276 if (changed)
277 drm_kms_helper_hotplug_event(dev);
278
279 if (repoll)
280 schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
281}
282
283/**
284 * drm_kms_helper_poll_disable - disable output polling
285 * @dev: drm_device
286 *
287 * This function disables the output polling work.
288 *
289 * Drivers can call this helper from their device suspend implementation. It is
290 * not an error to call this even when output polling isn't enabled or arlready
291 * disabled.
292 */
293void drm_kms_helper_poll_disable(struct drm_device *dev)
294{
295 if (!dev->mode_config.poll_enabled)
296 return;
297 cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
298}
299EXPORT_SYMBOL(drm_kms_helper_poll_disable);
300
301/**
302 * drm_kms_helper_poll_enable - re-enable output polling.
303 * @dev: drm_device
304 *
305 * This function re-enables the output polling work.
306 *
307 * Drivers can call this helper from their device resume implementation. It is
308 * an error to call this when the output polling support has not yet been set
309 * up.
310 */
311void drm_kms_helper_poll_enable(struct drm_device *dev)
312{
313 bool poll = false;
314 struct drm_connector *connector;
315
316 if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
317 return;
318
319 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
320 if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
321 DRM_CONNECTOR_POLL_DISCONNECT))
322 poll = true;
323 }
324
325 if (poll)
326 schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
327}
328EXPORT_SYMBOL(drm_kms_helper_poll_enable);
329
330/**
331 * drm_kms_helper_poll_init - initialize and enable output polling
332 * @dev: drm_device
333 *
334 * This function intializes and then also enables output polling support for
335 * @dev. Drivers which do not have reliable hotplug support in hardware can use
336 * this helper infrastructure to regularly poll such connectors for changes in
337 * their connection state.
338 *
339 * Drivers can control which connectors are polled by setting the
340 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
341 * connectors where probing live outputs can result in visual distortion drivers
342 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
343 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
344 * completely ignored by the polling logic.
345 *
346 * Note that a connector can be both polled and probed from the hotplug handler,
347 * in case the hotplug interrupt is known to be unreliable.
348 */
349void drm_kms_helper_poll_init(struct drm_device *dev)
350{
351 INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
352 dev->mode_config.poll_enabled = true;
353
354 drm_kms_helper_poll_enable(dev);
355}
356EXPORT_SYMBOL(drm_kms_helper_poll_init);
357
358/**
359 * drm_kms_helper_poll_fini - disable output polling and clean it up
360 * @dev: drm_device
361 */
362void drm_kms_helper_poll_fini(struct drm_device *dev)
363{
364 drm_kms_helper_poll_disable(dev);
365}
366EXPORT_SYMBOL(drm_kms_helper_poll_fini);
367
368/**
369 * drm_helper_hpd_irq_event - hotplug processing
370 * @dev: drm_device
371 *
372 * Drivers can use this helper function to run a detect cycle on all connectors
373 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
374 * other connectors are ignored, which is useful to avoid reprobing fixed
375 * panels.
376 *
377 * This helper function is useful for drivers which can't or don't track hotplug
378 * interrupts for each connector.
379 *
380 * Drivers which support hotplug interrupts for each connector individually and
381 * which have a more fine-grained detect logic should bypass this code and
382 * directly call drm_kms_helper_hotplug_event() in case the connector state
383 * changed.
384 *
385 * This function must be called from process context with no mode
386 * setting locks held.
387 *
388 * Note that a connector can be both polled and probed from the hotplug handler,
389 * in case the hotplug interrupt is known to be unreliable.
390 */
391bool drm_helper_hpd_irq_event(struct drm_device *dev)
392{
393 struct drm_connector *connector;
394 enum drm_connector_status old_status;
395 bool changed = false;
396
397 if (!dev->mode_config.poll_enabled)
398 return false;
399
400 mutex_lock(&dev->mode_config.mutex);
401 list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
402
403 /* Only handle HPD capable connectors. */
404 if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
405 continue;
406
407 old_status = connector->status;
408
409 connector->status = connector->funcs->detect(connector, false);
410 DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
411 connector->base.id,
412 drm_get_connector_name(connector),
413 drm_get_connector_status_name(old_status),
414 drm_get_connector_status_name(connector->status));
415 if (old_status != connector->status)
416 changed = true;
417 }
418
419 mutex_unlock(&dev->mode_config.mutex);
420
421 if (changed)
422 drm_kms_helper_hotplug_event(dev);
423
424 return changed;
425}
426EXPORT_SYMBOL(drm_helper_hpd_irq_event);
diff --git a/include/drm/drm_crtc_helper.h b/include/drm/drm_crtc_helper.h
index 0bb34ca2ad2b..36a5febac2a6 100644
--- a/include/drm/drm_crtc_helper.h
+++ b/include/drm/drm_crtc_helper.h
@@ -125,7 +125,6 @@ struct drm_connector_helper_funcs {
125 struct drm_encoder *(*best_encoder)(struct drm_connector *connector); 125 struct drm_encoder *(*best_encoder)(struct drm_connector *connector);
126}; 126};
127 127
128extern int drm_helper_probe_single_connector_modes(struct drm_connector *connector, uint32_t maxX, uint32_t maxY);
129extern void drm_helper_disable_unused_functions(struct drm_device *dev); 128extern void drm_helper_disable_unused_functions(struct drm_device *dev);
130extern int drm_crtc_helper_set_config(struct drm_mode_set *set); 129extern int drm_crtc_helper_set_config(struct drm_mode_set *set);
131extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc, 130extern bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
@@ -161,6 +160,11 @@ static inline void drm_connector_helper_add(struct drm_connector *connector,
161} 160}
162 161
163extern void drm_helper_resume_force_mode(struct drm_device *dev); 162extern void drm_helper_resume_force_mode(struct drm_device *dev);
163
164/* drm_probe_helper.c */
165extern int drm_helper_probe_single_connector_modes(struct drm_connector
166 *connector, uint32_t maxX,
167 uint32_t maxY);
164extern void drm_kms_helper_poll_init(struct drm_device *dev); 168extern void drm_kms_helper_poll_init(struct drm_device *dev);
165extern void drm_kms_helper_poll_fini(struct drm_device *dev); 169extern void drm_kms_helper_poll_fini(struct drm_device *dev);
166extern bool drm_helper_hpd_irq_event(struct drm_device *dev); 170extern bool drm_helper_hpd_irq_event(struct drm_device *dev);
generated by cgit v1.2.2 (git 2.25.0) at 2025-08-23 20:29:23 -0400