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  1. /*
  2.  * Copyright © 2008 Intel Corporation
  3.  *             2014 Red Hat Inc.
  4.  *
  5.  * Permission is hereby granted, free of charge, to any person obtaining a
  6.  * copy of this software and associated documentation files (the "Software"),
  7.  * to deal in the Software without restriction, including without limitation
  8.  * the rights to use, copy, modify, merge, publish, distribute, sublicense,
  9.  * and/or sell copies of the Software, and to permit persons to whom the
  10.  * Software is furnished to do so, subject to the following conditions:
  11.  *
  12.  * The above copyright notice and this permission notice (including the next
  13.  * paragraph) shall be included in all copies or substantial portions of the
  14.  * Software.
  15.  *
  16.  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17.  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18.  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
  19.  * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20.  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21.  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
  22.  * IN THE SOFTWARE.
  23.  *
  24.  */
  25.  
  26. #include <drm/drmP.h>
  27. #include "i915_drv.h"
  28. #include "intel_drv.h"
  29. #include <drm/drm_crtc_helper.h>
  30. #include <drm/drm_edid.h>
  31.  
  32. static bool intel_dp_mst_compute_config(struct intel_encoder *encoder,
  33.                                         struct intel_crtc_config *pipe_config)
  34. {
  35.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  36.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  37.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  38.         struct drm_device *dev = encoder->base.dev;
  39.         int bpp;
  40.         int lane_count, slots;
  41.         struct drm_display_mode *adjusted_mode = &pipe_config->adjusted_mode;
  42.         struct intel_connector *found = NULL, *intel_connector;
  43.         int mst_pbn;
  44.  
  45.         pipe_config->dp_encoder_is_mst = true;
  46.         pipe_config->has_pch_encoder = false;
  47.         pipe_config->has_dp_encoder = true;
  48.         bpp = 24;
  49.         /*
  50.          * for MST we always configure max link bw - the spec doesn't
  51.          * seem to suggest we should do otherwise.
  52.          */
  53.         lane_count = drm_dp_max_lane_count(intel_dp->dpcd);
  54.         intel_dp->link_bw = intel_dp_max_link_bw(intel_dp);
  55.         intel_dp->lane_count = lane_count;
  56.  
  57.         pipe_config->pipe_bpp = 24;
  58.         pipe_config->port_clock = drm_dp_bw_code_to_link_rate(intel_dp->link_bw);
  59.  
  60.         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
  61.                 if (intel_connector->new_encoder == encoder) {
  62.                         found = intel_connector;
  63.                         break;
  64.                 }
  65.         }
  66.  
  67.         if (!found) {
  68.                 DRM_ERROR("can't find connector\n");
  69.                 return false;
  70.         }
  71.  
  72.         mst_pbn = drm_dp_calc_pbn_mode(adjusted_mode->clock, bpp);
  73.  
  74.         pipe_config->pbn = mst_pbn;
  75.         slots = drm_dp_find_vcpi_slots(&intel_dp->mst_mgr, mst_pbn);
  76.  
  77.         intel_link_compute_m_n(bpp, lane_count,
  78.                                adjusted_mode->crtc_clock,
  79.                                pipe_config->port_clock,
  80.                                &pipe_config->dp_m_n);
  81.  
  82.         pipe_config->dp_m_n.tu = slots;
  83.         return true;
  84.  
  85. }
  86.  
  87. static void intel_mst_disable_dp(struct intel_encoder *encoder)
  88. {
  89.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  90.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  91.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  92.         int ret;
  93.  
  94.         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  95.  
  96.         drm_dp_mst_reset_vcpi_slots(&intel_dp->mst_mgr, intel_mst->port);
  97.  
  98.         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
  99.         if (ret) {
  100.                 DRM_ERROR("failed to update payload %d\n", ret);
  101.         }
  102. }
  103.  
  104. static void intel_mst_post_disable_dp(struct intel_encoder *encoder)
  105. {
  106.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  107.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  108.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  109.  
  110.         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  111.  
  112.         /* this can fail */
  113.         drm_dp_check_act_status(&intel_dp->mst_mgr);
  114.         /* and this can also fail */
  115.         drm_dp_update_payload_part2(&intel_dp->mst_mgr);
  116.  
  117.         drm_dp_mst_deallocate_vcpi(&intel_dp->mst_mgr, intel_mst->port);
  118.  
  119.         intel_dp->active_mst_links--;
  120.         intel_mst->port = NULL;
  121.         if (intel_dp->active_mst_links == 0) {
  122.                 intel_dig_port->base.post_disable(&intel_dig_port->base);
  123.                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
  124.         }
  125. }
  126.  
  127. static void intel_mst_pre_enable_dp(struct intel_encoder *encoder)
  128. {
  129.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  130.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  131.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  132.         struct drm_device *dev = encoder->base.dev;
  133.         struct drm_i915_private *dev_priv = dev->dev_private;
  134.         enum port port = intel_dig_port->port;
  135.         int ret;
  136.         uint32_t temp;
  137.         struct intel_connector *found = NULL, *intel_connector;
  138.         int slots;
  139.         struct drm_crtc *crtc = encoder->base.crtc;
  140.         struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
  141.  
  142.         list_for_each_entry(intel_connector, &dev->mode_config.connector_list, base.head) {
  143.                 if (intel_connector->new_encoder == encoder) {
  144.                         found = intel_connector;
  145.                         break;
  146.                 }
  147.         }
  148.  
  149.         if (!found) {
  150.                 DRM_ERROR("can't find connector\n");
  151.                 return;
  152.         }
  153.  
  154.         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  155.         intel_mst->port = found->port;
  156.  
  157.         if (intel_dp->active_mst_links == 0) {
  158.                 enum port port = intel_ddi_get_encoder_port(encoder);
  159.  
  160.                 I915_WRITE(PORT_CLK_SEL(port), intel_crtc->config.ddi_pll_sel);
  161.  
  162.                 intel_ddi_init_dp_buf_reg(&intel_dig_port->base);
  163.  
  164.                 intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
  165.  
  166.  
  167.                 intel_dp_start_link_train(intel_dp);
  168.                 intel_dp_complete_link_train(intel_dp);
  169.                 intel_dp_stop_link_train(intel_dp);
  170.         }
  171.  
  172.         ret = drm_dp_mst_allocate_vcpi(&intel_dp->mst_mgr,
  173.                                        intel_mst->port, intel_crtc->config.pbn, &slots);
  174.         if (ret == false) {
  175.                 DRM_ERROR("failed to allocate vcpi\n");
  176.                 return;
  177.         }
  178.  
  179.  
  180.         intel_dp->active_mst_links++;
  181.         temp = I915_READ(DP_TP_STATUS(port));
  182.         I915_WRITE(DP_TP_STATUS(port), temp);
  183.  
  184.         ret = drm_dp_update_payload_part1(&intel_dp->mst_mgr);
  185. }
  186.  
  187. static void intel_mst_enable_dp(struct intel_encoder *encoder)
  188. {
  189.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  190.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  191.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  192.         struct drm_device *dev = intel_dig_port->base.base.dev;
  193.         struct drm_i915_private *dev_priv = dev->dev_private;
  194.         enum port port = intel_dig_port->port;
  195.         int ret;
  196.  
  197.         DRM_DEBUG_KMS("%d\n", intel_dp->active_mst_links);
  198.  
  199.         if (wait_for((I915_READ(DP_TP_STATUS(port)) & DP_TP_STATUS_ACT_SENT),
  200.                      1))
  201.                 DRM_ERROR("Timed out waiting for ACT sent\n");
  202.  
  203.         ret = drm_dp_check_act_status(&intel_dp->mst_mgr);
  204.  
  205.         ret = drm_dp_update_payload_part2(&intel_dp->mst_mgr);
  206. }
  207.  
  208. static bool intel_dp_mst_enc_get_hw_state(struct intel_encoder *encoder,
  209.                                       enum pipe *pipe)
  210. {
  211.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  212.         *pipe = intel_mst->pipe;
  213.         if (intel_mst->port)
  214.                 return true;
  215.         return false;
  216. }
  217.  
  218. static void intel_dp_mst_enc_get_config(struct intel_encoder *encoder,
  219.                                         struct intel_crtc_config *pipe_config)
  220. {
  221.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(&encoder->base);
  222.         struct intel_digital_port *intel_dig_port = intel_mst->primary;
  223.         struct intel_crtc *crtc = to_intel_crtc(encoder->base.crtc);
  224.         struct drm_device *dev = encoder->base.dev;
  225.         struct drm_i915_private *dev_priv = dev->dev_private;
  226.         enum transcoder cpu_transcoder = crtc->config.cpu_transcoder;
  227.         u32 temp, flags = 0;
  228.  
  229.         pipe_config->has_dp_encoder = true;
  230.  
  231.         temp = I915_READ(TRANS_DDI_FUNC_CTL(cpu_transcoder));
  232.         if (temp & TRANS_DDI_PHSYNC)
  233.                 flags |= DRM_MODE_FLAG_PHSYNC;
  234.         else
  235.                 flags |= DRM_MODE_FLAG_NHSYNC;
  236.         if (temp & TRANS_DDI_PVSYNC)
  237.                 flags |= DRM_MODE_FLAG_PVSYNC;
  238.         else
  239.                 flags |= DRM_MODE_FLAG_NVSYNC;
  240.  
  241.         switch (temp & TRANS_DDI_BPC_MASK) {
  242.         case TRANS_DDI_BPC_6:
  243.                 pipe_config->pipe_bpp = 18;
  244.                 break;
  245.         case TRANS_DDI_BPC_8:
  246.                 pipe_config->pipe_bpp = 24;
  247.                 break;
  248.         case TRANS_DDI_BPC_10:
  249.                 pipe_config->pipe_bpp = 30;
  250.                 break;
  251.         case TRANS_DDI_BPC_12:
  252.                 pipe_config->pipe_bpp = 36;
  253.                 break;
  254.         default:
  255.                 break;
  256.         }
  257.         pipe_config->adjusted_mode.flags |= flags;
  258.         intel_dp_get_m_n(crtc, pipe_config);
  259.  
  260.         intel_ddi_clock_get(&intel_dig_port->base, pipe_config);
  261. }
  262.  
  263. static int intel_dp_mst_get_ddc_modes(struct drm_connector *connector)
  264. {
  265.         struct intel_connector *intel_connector = to_intel_connector(connector);
  266.         struct intel_dp *intel_dp = intel_connector->mst_port;
  267.         struct edid *edid;
  268.         int ret;
  269.  
  270.         edid = drm_dp_mst_get_edid(connector, &intel_dp->mst_mgr, intel_connector->port);
  271.         if (!edid)
  272.                 return 0;
  273.  
  274.         ret = intel_connector_update_modes(connector, edid);
  275.         kfree(edid);
  276.  
  277.         return ret;
  278. }
  279.  
  280. static enum drm_connector_status
  281. intel_dp_mst_detect(struct drm_connector *connector, bool force)
  282. {
  283.         struct intel_connector *intel_connector = to_intel_connector(connector);
  284.         struct intel_dp *intel_dp = intel_connector->mst_port;
  285.  
  286.         return drm_dp_mst_detect_port(connector, &intel_dp->mst_mgr, intel_connector->port);
  287. }
  288.  
  289. static int
  290. intel_dp_mst_set_property(struct drm_connector *connector,
  291.                           struct drm_property *property,
  292.                           uint64_t val)
  293. {
  294.         return 0;
  295. }
  296.  
  297. static void
  298. intel_dp_mst_connector_destroy(struct drm_connector *connector)
  299. {
  300.         struct intel_connector *intel_connector = to_intel_connector(connector);
  301.  
  302.         if (!IS_ERR_OR_NULL(intel_connector->edid))
  303.                 kfree(intel_connector->edid);
  304.  
  305.         drm_connector_cleanup(connector);
  306.         kfree(connector);
  307. }
  308.  
  309. static const struct drm_connector_funcs intel_dp_mst_connector_funcs = {
  310.         .dpms = intel_connector_dpms,
  311.         .detect = intel_dp_mst_detect,
  312.         .fill_modes = drm_helper_probe_single_connector_modes,
  313.         .set_property = intel_dp_mst_set_property,
  314.         .destroy = intel_dp_mst_connector_destroy,
  315. };
  316.  
  317. static int intel_dp_mst_get_modes(struct drm_connector *connector)
  318. {
  319.         return intel_dp_mst_get_ddc_modes(connector);
  320. }
  321.  
  322. static enum drm_mode_status
  323. intel_dp_mst_mode_valid(struct drm_connector *connector,
  324.                         struct drm_display_mode *mode)
  325. {
  326.         /* TODO - validate mode against available PBN for link */
  327.         if (mode->clock < 10000)
  328.                 return MODE_CLOCK_LOW;
  329.  
  330.         if (mode->flags & DRM_MODE_FLAG_DBLCLK)
  331.                 return MODE_H_ILLEGAL;
  332.  
  333.         return MODE_OK;
  334. }
  335.  
  336. static struct drm_encoder *intel_mst_best_encoder(struct drm_connector *connector)
  337. {
  338.         struct intel_connector *intel_connector = to_intel_connector(connector);
  339.         struct intel_dp *intel_dp = intel_connector->mst_port;
  340.         return &intel_dp->mst_encoders[0]->base.base;
  341. }
  342.  
  343. static const struct drm_connector_helper_funcs intel_dp_mst_connector_helper_funcs = {
  344.         .get_modes = intel_dp_mst_get_modes,
  345.         .mode_valid = intel_dp_mst_mode_valid,
  346.         .best_encoder = intel_mst_best_encoder,
  347. };
  348.  
  349. static void intel_dp_mst_encoder_destroy(struct drm_encoder *encoder)
  350. {
  351.         struct intel_dp_mst_encoder *intel_mst = enc_to_mst(encoder);
  352.  
  353.         drm_encoder_cleanup(encoder);
  354.         kfree(intel_mst);
  355. }
  356.  
  357. static const struct drm_encoder_funcs intel_dp_mst_enc_funcs = {
  358.         .destroy = intel_dp_mst_encoder_destroy,
  359. };
  360.  
  361. static bool intel_dp_mst_get_hw_state(struct intel_connector *connector)
  362. {
  363.         if (connector->encoder) {
  364.                 enum pipe pipe;
  365.                 if (!connector->encoder->get_hw_state(connector->encoder, &pipe))
  366.                         return false;
  367.                 return true;
  368.         }
  369.         return false;
  370. }
  371.  
  372. static void intel_connector_add_to_fbdev(struct intel_connector *connector)
  373. {
  374. #ifdef CONFIG_DRM_I915_FBDEV
  375.         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
  376.         drm_fb_helper_add_one_connector(&dev_priv->fbdev->helper, &connector->base);
  377. #endif
  378. }
  379.  
  380. static void intel_connector_remove_from_fbdev(struct intel_connector *connector)
  381. {
  382. #ifdef CONFIG_DRM_I915_FBDEV
  383.         struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
  384.         drm_fb_helper_remove_one_connector(&dev_priv->fbdev->helper, &connector->base);
  385. #endif
  386. }
  387.  
  388. static struct drm_connector *intel_dp_add_mst_connector(struct drm_dp_mst_topology_mgr *mgr, struct drm_dp_mst_port *port, const char *pathprop)
  389. {
  390.         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
  391.         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
  392.         struct drm_device *dev = intel_dig_port->base.base.dev;
  393.         struct intel_connector *intel_connector;
  394.         struct drm_connector *connector;
  395.         int i;
  396.  
  397.         intel_connector = kzalloc(sizeof(*intel_connector), GFP_KERNEL);
  398.         if (!intel_connector)
  399.                 return NULL;
  400.  
  401.         connector = &intel_connector->base;
  402.         drm_connector_init(dev, connector, &intel_dp_mst_connector_funcs, DRM_MODE_CONNECTOR_DisplayPort);
  403.         drm_connector_helper_add(connector, &intel_dp_mst_connector_helper_funcs);
  404.  
  405.         intel_connector->unregister = intel_connector_unregister;
  406.         intel_connector->get_hw_state = intel_dp_mst_get_hw_state;
  407.         intel_connector->mst_port = intel_dp;
  408.         intel_connector->port = port;
  409.  
  410.         for (i = PIPE_A; i <= PIPE_C; i++) {
  411.                 drm_mode_connector_attach_encoder(&intel_connector->base,
  412.                                                   &intel_dp->mst_encoders[i]->base.base);
  413.         }
  414.         intel_dp_add_properties(intel_dp, connector);
  415.  
  416.         drm_object_attach_property(&connector->base, dev->mode_config.path_property, 0);
  417.         drm_object_attach_property(&connector->base, dev->mode_config.tile_property, 0);
  418.  
  419.         drm_mode_connector_set_path_property(connector, pathprop);
  420.         drm_reinit_primary_mode_group(dev);
  421.         mutex_lock(&dev->mode_config.mutex);
  422.         intel_connector_add_to_fbdev(intel_connector);
  423.         mutex_unlock(&dev->mode_config.mutex);
  424.         drm_connector_register(&intel_connector->base);
  425.         return connector;
  426. }
  427.  
  428. static void intel_dp_destroy_mst_connector(struct drm_dp_mst_topology_mgr *mgr,
  429.                                            struct drm_connector *connector)
  430. {
  431.         struct intel_connector *intel_connector = to_intel_connector(connector);
  432.         struct drm_device *dev = connector->dev;
  433.         /* need to nuke the connector */
  434.         mutex_lock(&dev->mode_config.mutex);
  435.         intel_connector_dpms(connector, DRM_MODE_DPMS_OFF);
  436.         mutex_unlock(&dev->mode_config.mutex);
  437.  
  438.         intel_connector->unregister(intel_connector);
  439.  
  440.         mutex_lock(&dev->mode_config.mutex);
  441.         intel_connector_remove_from_fbdev(intel_connector);
  442.         drm_connector_cleanup(connector);
  443.         mutex_unlock(&dev->mode_config.mutex);
  444.  
  445.         drm_reinit_primary_mode_group(dev);
  446.  
  447.         kfree(intel_connector);
  448.         DRM_DEBUG_KMS("\n");
  449. }
  450.  
  451. static void intel_dp_mst_hotplug(struct drm_dp_mst_topology_mgr *mgr)
  452. {
  453.         struct intel_dp *intel_dp = container_of(mgr, struct intel_dp, mst_mgr);
  454.         struct intel_digital_port *intel_dig_port = dp_to_dig_port(intel_dp);
  455.         struct drm_device *dev = intel_dig_port->base.base.dev;
  456.  
  457.         drm_kms_helper_hotplug_event(dev);
  458. }
  459.  
  460. static struct drm_dp_mst_topology_cbs mst_cbs = {
  461.         .add_connector = intel_dp_add_mst_connector,
  462.         .destroy_connector = intel_dp_destroy_mst_connector,
  463.         .hotplug = intel_dp_mst_hotplug,
  464. };
  465.  
  466. static struct intel_dp_mst_encoder *
  467. intel_dp_create_fake_mst_encoder(struct intel_digital_port *intel_dig_port, enum pipe pipe)
  468. {
  469.         struct intel_dp_mst_encoder *intel_mst;
  470.         struct intel_encoder *intel_encoder;
  471.         struct drm_device *dev = intel_dig_port->base.base.dev;
  472.  
  473.         intel_mst = kzalloc(sizeof(*intel_mst), GFP_KERNEL);
  474.  
  475.         if (!intel_mst)
  476.                 return NULL;
  477.  
  478.         intel_mst->pipe = pipe;
  479.         intel_encoder = &intel_mst->base;
  480.         intel_mst->primary = intel_dig_port;
  481.  
  482.         drm_encoder_init(dev, &intel_encoder->base, &intel_dp_mst_enc_funcs,
  483.                          DRM_MODE_ENCODER_DPMST);
  484.  
  485.         intel_encoder->type = INTEL_OUTPUT_DP_MST;
  486.         intel_encoder->crtc_mask = 0x7;
  487.         intel_encoder->cloneable = 0;
  488.  
  489.         intel_encoder->compute_config = intel_dp_mst_compute_config;
  490.         intel_encoder->disable = intel_mst_disable_dp;
  491.         intel_encoder->post_disable = intel_mst_post_disable_dp;
  492.         intel_encoder->pre_enable = intel_mst_pre_enable_dp;
  493.         intel_encoder->enable = intel_mst_enable_dp;
  494.         intel_encoder->get_hw_state = intel_dp_mst_enc_get_hw_state;
  495.         intel_encoder->get_config = intel_dp_mst_enc_get_config;
  496.  
  497.         return intel_mst;
  498.  
  499. }
  500.  
  501. static bool
  502. intel_dp_create_fake_mst_encoders(struct intel_digital_port *intel_dig_port)
  503. {
  504.         int i;
  505.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  506.  
  507.         for (i = PIPE_A; i <= PIPE_C; i++)
  508.                 intel_dp->mst_encoders[i] = intel_dp_create_fake_mst_encoder(intel_dig_port, i);
  509.         return true;
  510. }
  511.  
  512. int
  513. intel_dp_mst_encoder_init(struct intel_digital_port *intel_dig_port, int conn_base_id)
  514. {
  515.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  516.         struct drm_device *dev = intel_dig_port->base.base.dev;
  517.         int ret;
  518.  
  519.         intel_dp->can_mst = true;
  520.         intel_dp->mst_mgr.cbs = &mst_cbs;
  521.  
  522.         /* create encoders */
  523.         intel_dp_create_fake_mst_encoders(intel_dig_port);
  524.         ret = drm_dp_mst_topology_mgr_init(&intel_dp->mst_mgr, dev->dev, &intel_dp->aux, 16, 3, conn_base_id);
  525.         if (ret) {
  526.                 intel_dp->can_mst = false;
  527.                 return ret;
  528.         }
  529.         return 0;
  530. }
  531.  
  532. void
  533. intel_dp_mst_encoder_cleanup(struct intel_digital_port *intel_dig_port)
  534. {
  535.         struct intel_dp *intel_dp = &intel_dig_port->dp;
  536.  
  537.         if (!intel_dp->can_mst)
  538.                 return;
  539.  
  540.         drm_dp_mst_topology_mgr_destroy(&intel_dp->mst_mgr);
  541.         /* encoders will get killed by normal cleanup */
  542. }
  543.