Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 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. |
Daniel Vetter | 092d01d | 2015-12-04 09:45:44 +0100 | [diff] [blame] | 56 | * |
| 57 | * The probe helpers share the function table structures with other display |
| 58 | * helper libraries. See struct &drm_connector_helper_funcs for the details. |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 59 | */ |
| 60 | |
| 61 | static bool drm_kms_helper_poll = true; |
| 62 | module_param_named(poll, drm_kms_helper_poll, bool, 0600); |
| 63 | |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 64 | static enum drm_mode_status |
| 65 | drm_mode_validate_flag(const struct drm_display_mode *mode, |
| 66 | int flags) |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 67 | { |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 68 | if ((mode->flags & DRM_MODE_FLAG_INTERLACE) && |
| 69 | !(flags & DRM_MODE_FLAG_INTERLACE)) |
| 70 | return MODE_NO_INTERLACE; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 71 | |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 72 | if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) && |
| 73 | !(flags & DRM_MODE_FLAG_DBLSCAN)) |
| 74 | return MODE_NO_DBLESCAN; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 75 | |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 76 | if ((mode->flags & DRM_MODE_FLAG_3D_MASK) && |
| 77 | !(flags & DRM_MODE_FLAG_3D_MASK)) |
| 78 | return MODE_NO_STEREO; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 79 | |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 80 | return MODE_OK; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 81 | } |
| 82 | |
Chris Wilson | eaf99c7 | 2014-08-06 10:08:32 +0200 | [diff] [blame] | 83 | static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector) |
| 84 | { |
| 85 | struct drm_display_mode *mode; |
| 86 | |
| 87 | if (!connector->cmdline_mode.specified) |
| 88 | return 0; |
| 89 | |
| 90 | mode = drm_mode_create_from_cmdline_mode(connector->dev, |
| 91 | &connector->cmdline_mode); |
| 92 | if (mode == NULL) |
| 93 | return 0; |
| 94 | |
| 95 | drm_mode_probed_add(connector, mode); |
| 96 | return 1; |
| 97 | } |
| 98 | |
Daniel Vetter | 8c4ccc4 | 2015-07-09 23:44:26 +0200 | [diff] [blame] | 99 | #define DRM_OUTPUT_POLL_PERIOD (10*HZ) |
Egbert Eich | 4ad640e | 2015-09-23 16:13:00 +0200 | [diff] [blame] | 100 | /** |
| 101 | * drm_kms_helper_poll_enable_locked - re-enable output polling. |
| 102 | * @dev: drm_device |
| 103 | * |
| 104 | * This function re-enables the output polling work without |
| 105 | * locking the mode_config mutex. |
| 106 | * |
| 107 | * This is like drm_kms_helper_poll_enable() however it is to be |
| 108 | * called from a context where the mode_config mutex is locked |
| 109 | * already. |
| 110 | */ |
| 111 | void drm_kms_helper_poll_enable_locked(struct drm_device *dev) |
Daniel Vetter | 8c4ccc4 | 2015-07-09 23:44:26 +0200 | [diff] [blame] | 112 | { |
| 113 | bool poll = false; |
| 114 | struct drm_connector *connector; |
| 115 | |
| 116 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
| 117 | |
| 118 | if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll) |
| 119 | return; |
| 120 | |
| 121 | drm_for_each_connector(connector, dev) { |
| 122 | if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT | |
| 123 | DRM_CONNECTOR_POLL_DISCONNECT)) |
| 124 | poll = true; |
| 125 | } |
| 126 | |
| 127 | if (poll) |
| 128 | schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD); |
| 129 | } |
Egbert Eich | 4ad640e | 2015-09-23 16:13:00 +0200 | [diff] [blame] | 130 | EXPORT_SYMBOL(drm_kms_helper_poll_enable_locked); |
| 131 | |
Daniel Vetter | 8c4ccc4 | 2015-07-09 23:44:26 +0200 | [diff] [blame] | 132 | |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 133 | static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector, |
| 134 | uint32_t maxX, uint32_t maxY, bool merge_type_bits) |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 135 | { |
| 136 | struct drm_device *dev = connector->dev; |
| 137 | struct drm_display_mode *mode; |
Jani Nikula | be26a66 | 2015-03-11 11:51:06 +0200 | [diff] [blame] | 138 | const struct drm_connector_helper_funcs *connector_funcs = |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 139 | connector->helper_private; |
| 140 | int count = 0; |
| 141 | int mode_flags = 0; |
| 142 | bool verbose_prune = true; |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 143 | enum drm_connector_status old_status; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 144 | |
| 145 | WARN_ON(!mutex_is_locked(&dev->mode_config.mutex)); |
| 146 | |
| 147 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id, |
Jani Nikula | 2593382 | 2014-06-03 14:56:20 +0300 | [diff] [blame] | 148 | connector->name); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 149 | /* set all modes to the unverified state */ |
| 150 | list_for_each_entry(mode, &connector->modes, head) |
| 151 | mode->status = MODE_UNVERIFIED; |
| 152 | |
Daniel Vetter | ed293f7 | 2015-11-19 17:46:50 +0100 | [diff] [blame] | 153 | old_status = connector->status; |
| 154 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 155 | if (connector->force) { |
Peter Hurley | 2c4cc91 | 2014-11-03 20:51:45 -0500 | [diff] [blame] | 156 | if (connector->force == DRM_FORCE_ON || |
| 157 | connector->force == DRM_FORCE_ON_DIGITAL) |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 158 | connector->status = connector_status_connected; |
| 159 | else |
| 160 | connector->status = connector_status_disconnected; |
| 161 | if (connector->funcs->force) |
| 162 | connector->funcs->force(connector); |
| 163 | } else { |
| 164 | connector->status = connector->funcs->detect(connector, true); |
Daniel Vetter | ed293f7 | 2015-11-19 17:46:50 +0100 | [diff] [blame] | 165 | } |
| 166 | |
| 167 | /* |
| 168 | * Normally either the driver's hpd code or the poll loop should |
| 169 | * pick up any changes and fire the hotplug event. But if |
| 170 | * userspace sneaks in a probe, we might miss a change. Hence |
| 171 | * check here, and if anything changed start the hotplug code. |
| 172 | */ |
| 173 | if (old_status != connector->status) { |
Jani Nikula | 4e15f2a | 2015-12-03 14:00:03 +0200 | [diff] [blame] | 174 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
Daniel Vetter | ed293f7 | 2015-11-19 17:46:50 +0100 | [diff] [blame] | 175 | connector->base.id, |
| 176 | connector->name, |
Jani Nikula | 4e15f2a | 2015-12-03 14:00:03 +0200 | [diff] [blame] | 177 | drm_get_connector_status_name(old_status), |
| 178 | drm_get_connector_status_name(connector->status)); |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 179 | |
| 180 | /* |
Daniel Vetter | ed293f7 | 2015-11-19 17:46:50 +0100 | [diff] [blame] | 181 | * The hotplug event code might call into the fb |
| 182 | * helpers, and so expects that we do not hold any |
| 183 | * locks. Fire up the poll struct instead, it will |
| 184 | * disable itself again. |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 185 | */ |
Daniel Vetter | ed293f7 | 2015-11-19 17:46:50 +0100 | [diff] [blame] | 186 | dev->mode_config.delayed_event = true; |
| 187 | if (dev->mode_config.poll_enabled) |
| 188 | schedule_delayed_work(&dev->mode_config.output_poll_work, |
| 189 | 0); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | /* Re-enable polling in case the global poll config changed. */ |
| 193 | if (drm_kms_helper_poll != dev->mode_config.poll_running) |
Egbert Eich | 4ad640e | 2015-09-23 16:13:00 +0200 | [diff] [blame] | 194 | drm_kms_helper_poll_enable_locked(dev); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 195 | |
| 196 | dev->mode_config.poll_running = drm_kms_helper_poll; |
| 197 | |
| 198 | if (connector->status == connector_status_disconnected) { |
| 199 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n", |
Jani Nikula | 2593382 | 2014-06-03 14:56:20 +0300 | [diff] [blame] | 200 | connector->base.id, connector->name); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 201 | drm_mode_connector_update_edid_property(connector, NULL); |
| 202 | verbose_prune = false; |
| 203 | goto prune; |
| 204 | } |
| 205 | |
| 206 | #ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE |
| 207 | count = drm_load_edid_firmware(connector); |
| 208 | if (count == 0) |
| 209 | #endif |
Thomas Wood | 4cf2b28 | 2014-06-18 17:52:33 +0100 | [diff] [blame] | 210 | { |
| 211 | if (connector->override_edid) { |
| 212 | struct edid *edid = (struct edid *) connector->edid_blob_ptr->data; |
| 213 | |
| 214 | count = drm_add_edid_modes(connector, edid); |
Jani Nikula | ad692b4 | 2015-03-26 10:42:00 +0200 | [diff] [blame] | 215 | drm_edid_to_eld(connector, edid); |
Thomas Wood | 4cf2b28 | 2014-06-18 17:52:33 +0100 | [diff] [blame] | 216 | } else |
| 217 | count = (*connector_funcs->get_modes)(connector); |
| 218 | } |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 219 | |
| 220 | if (count == 0 && connector->status == connector_status_connected) |
| 221 | count = drm_add_modes_noedid(connector, 1024, 768); |
Chris Wilson | eaf99c7 | 2014-08-06 10:08:32 +0200 | [diff] [blame] | 222 | count += drm_helper_probe_add_cmdline_mode(connector); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 223 | if (count == 0) |
| 224 | goto prune; |
| 225 | |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 226 | drm_mode_connector_list_update(connector, merge_type_bits); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 227 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 228 | if (connector->interlace_allowed) |
| 229 | mode_flags |= DRM_MODE_FLAG_INTERLACE; |
| 230 | if (connector->doublescan_allowed) |
| 231 | mode_flags |= DRM_MODE_FLAG_DBLSCAN; |
| 232 | if (connector->stereo_allowed) |
| 233 | mode_flags |= DRM_MODE_FLAG_3D_MASK; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 234 | |
| 235 | list_for_each_entry(mode, &connector->modes, head) { |
Ville Syrjälä | be8719a | 2015-12-03 23:14:09 +0200 | [diff] [blame^] | 236 | if (mode->status == MODE_OK) |
| 237 | mode->status = drm_mode_validate_basic(mode); |
Ville Syrjälä | abc0b14 | 2014-12-17 13:56:23 +0200 | [diff] [blame] | 238 | |
| 239 | if (mode->status == MODE_OK) |
| 240 | mode->status = drm_mode_validate_size(mode, maxX, maxY); |
Ville Syrjälä | 05acaec | 2014-12-17 13:56:22 +0200 | [diff] [blame] | 241 | |
| 242 | if (mode->status == MODE_OK) |
| 243 | mode->status = drm_mode_validate_flag(mode, mode_flags); |
| 244 | |
Andrzej Hajda | f9b0e25 | 2014-04-02 12:29:46 +0200 | [diff] [blame] | 245 | if (mode->status == MODE_OK && connector_funcs->mode_valid) |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 246 | mode->status = connector_funcs->mode_valid(connector, |
| 247 | mode); |
| 248 | } |
| 249 | |
| 250 | prune: |
| 251 | drm_mode_prune_invalid(dev, &connector->modes, verbose_prune); |
| 252 | |
| 253 | if (list_empty(&connector->modes)) |
| 254 | return 0; |
| 255 | |
| 256 | list_for_each_entry(mode, &connector->modes, head) |
| 257 | mode->vrefresh = drm_mode_vrefresh(mode); |
| 258 | |
| 259 | drm_mode_sort(&connector->modes); |
| 260 | |
| 261 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id, |
Jani Nikula | 2593382 | 2014-06-03 14:56:20 +0300 | [diff] [blame] | 262 | connector->name); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 263 | list_for_each_entry(mode, &connector->modes, head) { |
| 264 | drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V); |
| 265 | drm_mode_debug_printmodeline(mode); |
| 266 | } |
| 267 | |
| 268 | return count; |
| 269 | } |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 270 | |
| 271 | /** |
| 272 | * drm_helper_probe_single_connector_modes - get complete set of display modes |
| 273 | * @connector: connector to probe |
| 274 | * @maxX: max width for modes |
| 275 | * @maxY: max height for modes |
| 276 | * |
Daniel Vetter | 2be9497 | 2015-12-04 09:45:46 +0100 | [diff] [blame] | 277 | * Based on the helper callbacks implemented by @connector in struct |
| 278 | * &drm_connector_helper_funcs try to detect all valid modes. Modes will first |
| 279 | * be added to the connector's probed_modes list, then culled (based on validity |
| 280 | * and the @maxX, @maxY parameters) and put into the normal modes list. |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 281 | * |
Daniel Vetter | 2be9497 | 2015-12-04 09:45:46 +0100 | [diff] [blame] | 282 | * Intended to be used as a generic implementation of the ->fill_modes() |
| 283 | * @connector vfunc for drivers that use the CRTC helpers for output mode |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 284 | * filtering and detection. |
| 285 | * |
Daniel Vetter | 2be9497 | 2015-12-04 09:45:46 +0100 | [diff] [blame] | 286 | * If the helper operation returns no mode, and if the connector status is |
| 287 | * connector_status_connected, standard VESA DMT modes up to 1024x768 are |
| 288 | * automatically added to the modes list by a call to |
| 289 | * drm_add_modes_noedid(). |
| 290 | * |
| 291 | * The function then filters out modes larger than @maxX and maxY if specified. |
| 292 | * It finally calls the optional connector ->mode_valid() helper operation for each |
| 293 | * mode in the probed list to check whether the mode is valid for the connector. |
| 294 | * |
| 295 | * Compared to drm_helper_probe_single_connector_modes_nomerge() this function |
| 296 | * merged the mode bits for the preferred mode, as a hack to work around some |
| 297 | * quirky issues on funky hardware. |
| 298 | * |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 299 | * Returns: |
| 300 | * The number of modes found on @connector. |
| 301 | */ |
| 302 | int drm_helper_probe_single_connector_modes(struct drm_connector *connector, |
| 303 | uint32_t maxX, uint32_t maxY) |
| 304 | { |
| 305 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true); |
| 306 | } |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 307 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes); |
| 308 | |
| 309 | /** |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 310 | * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes |
| 311 | * @connector: connector to probe |
| 312 | * @maxX: max width for modes |
| 313 | * @maxY: max height for modes |
| 314 | * |
Daniel Vetter | 2be9497 | 2015-12-04 09:45:46 +0100 | [diff] [blame] | 315 | * This operates like drm_hehlper_probe_single_connector_modes() except it |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 316 | * replaces the mode bits instead of merging them for preferred modes. |
Daniel Vetter | 2be9497 | 2015-12-04 09:45:46 +0100 | [diff] [blame] | 317 | * |
| 318 | * Returns: |
| 319 | * The number of modes found on @connector. |
Dave Airlie | b87577b | 2014-05-01 09:26:53 +1000 | [diff] [blame] | 320 | */ |
| 321 | int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector, |
| 322 | uint32_t maxX, uint32_t maxY) |
| 323 | { |
| 324 | return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false); |
| 325 | } |
| 326 | EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge); |
| 327 | |
| 328 | /** |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 329 | * drm_kms_helper_hotplug_event - fire off KMS hotplug events |
| 330 | * @dev: drm_device whose connector state changed |
| 331 | * |
| 332 | * This function fires off the uevent for userspace and also calls the |
| 333 | * output_poll_changed function, which is most commonly used to inform the fbdev |
| 334 | * emulation code and allow it to update the fbcon output configuration. |
| 335 | * |
| 336 | * Drivers should call this from their hotplug handling code when a change is |
| 337 | * detected. Note that this function does not do any output detection of its |
| 338 | * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the |
| 339 | * driver already. |
| 340 | * |
| 341 | * This function must be called from process context with no mode |
| 342 | * setting locks held. |
| 343 | */ |
| 344 | void drm_kms_helper_hotplug_event(struct drm_device *dev) |
| 345 | { |
| 346 | /* send a uevent + call fbdev */ |
| 347 | drm_sysfs_hotplug_event(dev); |
| 348 | if (dev->mode_config.funcs->output_poll_changed) |
| 349 | dev->mode_config.funcs->output_poll_changed(dev); |
| 350 | } |
| 351 | EXPORT_SYMBOL(drm_kms_helper_hotplug_event); |
| 352 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 353 | static void output_poll_execute(struct work_struct *work) |
| 354 | { |
| 355 | struct delayed_work *delayed_work = to_delayed_work(work); |
| 356 | struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work); |
| 357 | struct drm_connector *connector; |
| 358 | enum drm_connector_status old_status; |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 359 | bool repoll = false, changed; |
| 360 | |
| 361 | /* Pick up any changes detected by the probe functions. */ |
| 362 | changed = dev->mode_config.delayed_event; |
| 363 | dev->mode_config.delayed_event = false; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 364 | |
| 365 | if (!drm_kms_helper_poll) |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 366 | goto out; |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 367 | |
| 368 | mutex_lock(&dev->mode_config.mutex); |
Daniel Vetter | 6295d60 | 2015-07-09 23:44:25 +0200 | [diff] [blame] | 369 | drm_for_each_connector(connector, dev) { |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 370 | |
| 371 | /* Ignore forced connectors. */ |
| 372 | if (connector->force) |
| 373 | continue; |
| 374 | |
| 375 | /* Ignore HPD capable connectors and connectors where we don't |
| 376 | * want any hotplug detection at all for polling. */ |
| 377 | if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD) |
| 378 | continue; |
| 379 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 380 | old_status = connector->status; |
| 381 | /* if we are connected and don't want to poll for disconnect |
| 382 | skip it */ |
| 383 | if (old_status == connector_status_connected && |
| 384 | !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT)) |
| 385 | continue; |
| 386 | |
Josef Holzmayr | a3c6d68 | 2015-04-16 14:16:29 +0200 | [diff] [blame] | 387 | repoll = true; |
| 388 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 389 | connector->status = connector->funcs->detect(connector, false); |
| 390 | if (old_status != connector->status) { |
| 391 | const char *old, *new; |
| 392 | |
Daniel Vetter | b770372 | 2015-01-21 08:45:22 +0100 | [diff] [blame] | 393 | /* |
| 394 | * The poll work sets force=false when calling detect so |
| 395 | * that drivers can avoid to do disruptive tests (e.g. |
| 396 | * when load detect cycles could cause flickering on |
| 397 | * other, running displays). This bears the risk that we |
| 398 | * flip-flop between unknown here in the poll work and |
| 399 | * the real state when userspace forces a full detect |
| 400 | * call after receiving a hotplug event due to this |
| 401 | * change. |
| 402 | * |
| 403 | * Hence clamp an unknown detect status to the old |
| 404 | * value. |
| 405 | */ |
| 406 | if (connector->status == connector_status_unknown) { |
| 407 | connector->status = old_status; |
| 408 | continue; |
| 409 | } |
| 410 | |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 411 | old = drm_get_connector_status_name(old_status); |
| 412 | new = drm_get_connector_status_name(connector->status); |
| 413 | |
| 414 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] " |
| 415 | "status updated from %s to %s\n", |
| 416 | connector->base.id, |
Jani Nikula | 2593382 | 2014-06-03 14:56:20 +0300 | [diff] [blame] | 417 | connector->name, |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 418 | old, new); |
| 419 | |
| 420 | changed = true; |
| 421 | } |
| 422 | } |
| 423 | |
| 424 | mutex_unlock(&dev->mode_config.mutex); |
| 425 | |
Daniel Vetter | 162b6a5 | 2015-01-21 08:45:21 +0100 | [diff] [blame] | 426 | out: |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 427 | if (changed) |
| 428 | drm_kms_helper_hotplug_event(dev); |
| 429 | |
| 430 | if (repoll) |
| 431 | schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD); |
| 432 | } |
| 433 | |
| 434 | /** |
| 435 | * drm_kms_helper_poll_disable - disable output polling |
| 436 | * @dev: drm_device |
| 437 | * |
| 438 | * This function disables the output polling work. |
| 439 | * |
| 440 | * Drivers can call this helper from their device suspend implementation. It is |
| 441 | * not an error to call this even when output polling isn't enabled or arlready |
| 442 | * disabled. |
| 443 | */ |
| 444 | void drm_kms_helper_poll_disable(struct drm_device *dev) |
| 445 | { |
| 446 | if (!dev->mode_config.poll_enabled) |
| 447 | return; |
| 448 | cancel_delayed_work_sync(&dev->mode_config.output_poll_work); |
| 449 | } |
| 450 | EXPORT_SYMBOL(drm_kms_helper_poll_disable); |
| 451 | |
| 452 | /** |
| 453 | * drm_kms_helper_poll_enable - re-enable output polling. |
| 454 | * @dev: drm_device |
| 455 | * |
| 456 | * This function re-enables the output polling work. |
| 457 | * |
| 458 | * Drivers can call this helper from their device resume implementation. It is |
| 459 | * an error to call this when the output polling support has not yet been set |
| 460 | * up. |
| 461 | */ |
| 462 | void drm_kms_helper_poll_enable(struct drm_device *dev) |
| 463 | { |
Daniel Vetter | 8c4ccc4 | 2015-07-09 23:44:26 +0200 | [diff] [blame] | 464 | mutex_lock(&dev->mode_config.mutex); |
Egbert Eich | 4ad640e | 2015-09-23 16:13:00 +0200 | [diff] [blame] | 465 | drm_kms_helper_poll_enable_locked(dev); |
Daniel Vetter | 8c4ccc4 | 2015-07-09 23:44:26 +0200 | [diff] [blame] | 466 | mutex_unlock(&dev->mode_config.mutex); |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 467 | } |
| 468 | EXPORT_SYMBOL(drm_kms_helper_poll_enable); |
| 469 | |
| 470 | /** |
| 471 | * drm_kms_helper_poll_init - initialize and enable output polling |
| 472 | * @dev: drm_device |
| 473 | * |
| 474 | * This function intializes and then also enables output polling support for |
| 475 | * @dev. Drivers which do not have reliable hotplug support in hardware can use |
| 476 | * this helper infrastructure to regularly poll such connectors for changes in |
| 477 | * their connection state. |
| 478 | * |
| 479 | * Drivers can control which connectors are polled by setting the |
| 480 | * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On |
| 481 | * connectors where probing live outputs can result in visual distortion drivers |
| 482 | * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this. |
| 483 | * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are |
| 484 | * completely ignored by the polling logic. |
| 485 | * |
| 486 | * Note that a connector can be both polled and probed from the hotplug handler, |
| 487 | * in case the hotplug interrupt is known to be unreliable. |
| 488 | */ |
| 489 | void drm_kms_helper_poll_init(struct drm_device *dev) |
| 490 | { |
| 491 | INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute); |
| 492 | dev->mode_config.poll_enabled = true; |
| 493 | |
| 494 | drm_kms_helper_poll_enable(dev); |
| 495 | } |
| 496 | EXPORT_SYMBOL(drm_kms_helper_poll_init); |
| 497 | |
| 498 | /** |
| 499 | * drm_kms_helper_poll_fini - disable output polling and clean it up |
| 500 | * @dev: drm_device |
| 501 | */ |
| 502 | void drm_kms_helper_poll_fini(struct drm_device *dev) |
| 503 | { |
| 504 | drm_kms_helper_poll_disable(dev); |
| 505 | } |
| 506 | EXPORT_SYMBOL(drm_kms_helper_poll_fini); |
| 507 | |
| 508 | /** |
| 509 | * drm_helper_hpd_irq_event - hotplug processing |
| 510 | * @dev: drm_device |
| 511 | * |
| 512 | * Drivers can use this helper function to run a detect cycle on all connectors |
| 513 | * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All |
| 514 | * other connectors are ignored, which is useful to avoid reprobing fixed |
| 515 | * panels. |
| 516 | * |
| 517 | * This helper function is useful for drivers which can't or don't track hotplug |
| 518 | * interrupts for each connector. |
| 519 | * |
| 520 | * Drivers which support hotplug interrupts for each connector individually and |
| 521 | * which have a more fine-grained detect logic should bypass this code and |
| 522 | * directly call drm_kms_helper_hotplug_event() in case the connector state |
| 523 | * changed. |
| 524 | * |
| 525 | * This function must be called from process context with no mode |
| 526 | * setting locks held. |
| 527 | * |
| 528 | * Note that a connector can be both polled and probed from the hotplug handler, |
| 529 | * in case the hotplug interrupt is known to be unreliable. |
| 530 | */ |
| 531 | bool drm_helper_hpd_irq_event(struct drm_device *dev) |
| 532 | { |
| 533 | struct drm_connector *connector; |
| 534 | enum drm_connector_status old_status; |
| 535 | bool changed = false; |
| 536 | |
| 537 | if (!dev->mode_config.poll_enabled) |
| 538 | return false; |
| 539 | |
| 540 | mutex_lock(&dev->mode_config.mutex); |
Daniel Vetter | 6295d60 | 2015-07-09 23:44:25 +0200 | [diff] [blame] | 541 | drm_for_each_connector(connector, dev) { |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 542 | |
| 543 | /* Only handle HPD capable connectors. */ |
| 544 | if (!(connector->polled & DRM_CONNECTOR_POLL_HPD)) |
| 545 | continue; |
| 546 | |
| 547 | old_status = connector->status; |
| 548 | |
| 549 | connector->status = connector->funcs->detect(connector, false); |
| 550 | DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n", |
| 551 | connector->base.id, |
Jani Nikula | 2593382 | 2014-06-03 14:56:20 +0300 | [diff] [blame] | 552 | connector->name, |
Daniel Vetter | 8d75454 | 2014-04-10 10:51:11 +0200 | [diff] [blame] | 553 | drm_get_connector_status_name(old_status), |
| 554 | drm_get_connector_status_name(connector->status)); |
| 555 | if (old_status != connector->status) |
| 556 | changed = true; |
| 557 | } |
| 558 | |
| 559 | mutex_unlock(&dev->mode_config.mutex); |
| 560 | |
| 561 | if (changed) |
| 562 | drm_kms_helper_hotplug_event(dev); |
| 563 | |
| 564 | return changed; |
| 565 | } |
| 566 | EXPORT_SYMBOL(drm_helper_hpd_irq_event); |