text: // SPDX-License-Identifier: GPL-2.0-only
  /*
   * Copyright (c) 2017-2020, The Linux Foundation. All rights reserved.
   */
  
  #include <linux/module.h>
  #include <linux/slab.h>
  #include <linux/uaccess.h>
  #include <linux/debugfs.h>
  #include <linux/component.h>
  #include <linux/of_irq.h>
  #include <linux/delay.h>
  
  #include "msm_drv.h"
  #include "msm_kms.h"
  #include "dp_hpd.h"
  #include "dp_parser.h"
  #include "dp_power.h"
  #include "dp_catalog.h"
  #include "dp_aux.h"
  #include "dp_reg.h"
  #include "dp_link.h"
  #include "dp_panel.h"
  #include "dp_ctrl.h"
  #include "dp_display.h"
  #include "dp_drm.h"
  #include "dp_audio.h"
  #include "dp_debug.h"
  
  static struct msm_dp *g_dp_display;
  #define HPD_STRING_SIZE 30
  
  enum {
  	ISR_DISCONNECTED,
  	ISR_CONNECT_PENDING,
  	ISR_CONNECTED,
  	ISR_HPD_REPLUG_COUNT,
  	ISR_IRQ_HPD_PULSE_COUNT,
  	ISR_HPD_LO_GLITH_COUNT,
  };
  
  /* event thread connection state */
  enum {
  	ST_DISCONNECTED,
  	ST_CONNECT_PENDING,
  	ST_CONNECTED,
  	ST_DISCONNECT_PENDING,
  	ST_SUSPEND_PENDING,
  	ST_SUSPENDED,
  };
  
  enum {
  	EV_NO_EVENT,
  	/* hpd events */
  	EV_HPD_INIT_SETUP,
  	EV_HPD_PLUG_INT,
  	EV_IRQ_HPD_INT,
  	EV_HPD_REPLUG_INT,
  	EV_HPD_UNPLUG_INT,
  	EV_USER_NOTIFICATION,
  	EV_CONNECT_PENDING_TIMEOUT,
  	EV_DISCONNECT_PENDING_TIMEOUT,
  };
  
  #define EVENT_TIMEOUT	(HZ/10)	/* 100ms */
  #define DP_EVENT_Q_MAX	8
  
  #define DP_TIMEOUT_5_SECOND	(5000/EVENT_TIMEOUT)
  #define DP_TIMEOUT_NONE		0
  
  #define WAIT_FOR_RESUME_TIMEOUT_JIFFIES (HZ / 2)
  
  struct dp_event {
  	u32 event_id;
  	u32 data;
  	u32 delay;
  };
  
  struct dp_display_private {
  	char *name;
  	int irq;
  
  	/* state variables */
  	bool core_initialized;
  	bool hpd_irq_on;
  	bool audio_supported;
  
  	struct platform_device *pdev;
  	struct dentry *root;
  
  	struct dp_usbpd   *usbpd;
  	struct dp_parser  *parser;
  	struct dp_power   *power;
  	struct dp_catalog *catalog;
  	struct drm_dp_aux *aux;
  	struct dp_link    *link;
  	struct dp_panel   *panel;
  	struct dp_ctrl    *ctrl;
  	struct dp_debug   *debug;
  
  	struct dp_usbpd_cb usbpd_cb;
  	struct dp_display_mode dp_mode;
  	struct msm_dp dp_display;
  
  	/* wait for audio signaling */
  	struct completion audio_comp;
  
  	/* event related only access by event thread */
  	struct mutex event_mutex;
  	wait_queue_head_t event_q;
  	u32 hpd_state;
  	u32 event_pndx;
  	u32 event_gndx;
  	struct dp_event event_list[DP_EVENT_Q_MAX];
  	spinlock_t event_lock;
  
  	struct dp_audio *audio;
  };
  
  static const struct of_device_id dp_dt_match[] = {
  	{.compatible = "qcom,sc7180-dp"},
  	{}
  };
  
  static int dp_add_event(struct dp_display_private *dp_priv, u32 event,
  						u32 data, u32 delay)
  {
  	unsigned long flag;
  	struct dp_event *todo;
  	int pndx;
  
  	spin_lock_irqsave(&dp_priv->event_lock, flag);
  	pndx = dp_priv->event_pndx + 1;
  	pndx %= DP_EVENT_Q_MAX;
  	if (pndx == dp_priv->event_gndx) {
  		pr_err("event_q is full: pndx=%d gndx=%d\n",
  			dp_priv->event_pndx, dp_priv->event_gndx);
  		spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  		return -EPERM;
  	}
  	todo = &dp_priv->event_list[dp_priv->event_pndx++];
  	dp_priv->event_pndx %= DP_EVENT_Q_MAX;
  	todo->event_id = event;
  	todo->data = data;
  	todo->delay = delay;
  	wake_up(&dp_priv->event_q);
  	spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  
  	return 0;
  }
  
  static int dp_del_event(struct dp_display_private *dp_priv, u32 event)
  {
  	unsigned long flag;
  	struct dp_event *todo;
  	u32	gndx;
  
  	spin_lock_irqsave(&dp_priv->event_lock, flag);
  	if (dp_priv->event_pndx == dp_priv->event_gndx) {
  		spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  		return -ENOENT;
  	}
  
  	gndx = dp_priv->event_gndx;
  	while (dp_priv->event_pndx != gndx) {
  		todo = &dp_priv->event_list[gndx];
  		if (todo->event_id == event) {
  			todo->event_id = EV_NO_EVENT;	/* deleted */
  			todo->delay = 0;
  		}
  		gndx++;
  		gndx %= DP_EVENT_Q_MAX;
  	}
  	spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  
  	return 0;
  }
  
  void dp_display_signal_audio_start(struct msm_dp *dp_display)
  {
  	struct dp_display_private *dp;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	reinit_completion(&dp->audio_comp);
  }
  
  void dp_display_signal_audio_complete(struct msm_dp *dp_display)
  {
  	struct dp_display_private *dp;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	complete_all(&dp->audio_comp);
  }
  
  static int dp_display_bind(struct device *dev, struct device *master,
  			   void *data)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  	struct drm_device *drm;
  	struct msm_drm_private *priv;
  
  	drm = dev_get_drvdata(master);
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  	if (!dp) {
  		DRM_ERROR("DP driver bind failed. Invalid driver data\n");
  		return -EINVAL;
  	}
  
  	dp->dp_display.drm_dev = drm;
  	priv = drm->dev_private;
  	priv->dp = &(dp->dp_display);
  
  	rc = dp->parser->parse(dp->parser);
  	if (rc) {
  		DRM_ERROR("device tree parsing failed\n");
  		goto end;
  	}
  
  	rc = dp_aux_register(dp->aux);
  	if (rc) {
  		DRM_ERROR("DRM DP AUX register failed\n");
  		goto end;
  	}
  
  	rc = dp_power_client_init(dp->power);
  	if (rc) {
  		DRM_ERROR("Power client create failed\n");
  		goto end;
  	}
  
  	rc = dp_register_audio_driver(dev, dp->audio);
  	if (rc)
  		DRM_ERROR("Audio registration Dp failed\n");
  
  end:
  	return rc;
  }
  
  static void dp_display_unbind(struct device *dev, struct device *master,
  			      void *data)
  {
  	struct dp_display_private *dp;
  	struct drm_device *drm = dev_get_drvdata(master);
  	struct msm_drm_private *priv = drm->dev_private;
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  	if (!dp) {
  		DRM_ERROR("Invalid DP driver data\n");
  		return;
  	}
  
  	dp_power_client_deinit(dp->power);
  	dp_aux_unregister(dp->aux);
  	priv->dp = NULL;
  }
  
  static const struct component_ops dp_display_comp_ops = {
  	.bind = dp_display_bind,
  	.unbind = dp_display_unbind,
  };
  
  static bool dp_display_is_ds_bridge(struct dp_panel *panel)
  {
  	return (panel->dpcd[DP_DOWNSTREAMPORT_PRESENT] &
  		DP_DWN_STRM_PORT_PRESENT);
  }
  
  static bool dp_display_is_sink_count_zero(struct dp_display_private *dp)
  {
  	return dp_display_is_ds_bridge(dp->panel) &&
  		(dp->link->sink_count == 0);
  }
  
  static void dp_display_send_hpd_event(struct msm_dp *dp_display)
  {
  	struct dp_display_private *dp;
  	struct drm_connector *connector;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	connector = dp->dp_display.connector;
  	drm_helper_hpd_irq_event(connector->dev);
  }
  
  static int dp_display_send_hpd_notification(struct dp_display_private *dp,
  					    bool hpd)
  {
  	static bool encoder_mode_set;
  	struct msm_drm_private *priv = dp->dp_display.drm_dev->dev_private;
  	struct msm_kms *kms = priv->kms;
  
  	if ((hpd && dp->dp_display.is_connected) ||
  			(!hpd && !dp->dp_display.is_connected)) {
  		DRM_DEBUG_DP("HPD already %s\n", (hpd ? "on" : "off"));
  		return 0;
  	}
  
  	/* reset video pattern flag on disconnect */
  	if (!hpd)
  		dp->panel->video_test = false;
  
  	dp->dp_display.is_connected = hpd;
  
  	if (dp->dp_display.is_connected && dp->dp_display.encoder
  				&& !encoder_mode_set
  				&& kms->funcs->set_encoder_mode) {
  		kms->funcs->set_encoder_mode(kms,
  				dp->dp_display.encoder, false);
  		DRM_DEBUG_DP("set_encoder_mode() Completed\n");
  		encoder_mode_set = true;
  	}
  
  	dp_display_send_hpd_event(&dp->dp_display);
  
  	return 0;
  }
  
  static int dp_display_process_hpd_high(struct dp_display_private *dp)
  {
  	int rc = 0;
  	struct edid *edid;
  
  	dp->panel->max_dp_lanes = dp->parser->max_dp_lanes;
  
  	rc = dp_panel_read_sink_caps(dp->panel, dp->dp_display.connector);
  	if (rc)
  		goto end;
  
  	dp_link_process_request(dp->link);
  
  	edid = dp->panel->edid;
  
  	dp->audio_supported = drm_detect_monitor_audio(edid);
  	dp_panel_handle_sink_request(dp->panel);
  
  	dp->dp_display.max_pclk_khz = DP_MAX_PIXEL_CLK_KHZ;
  	dp->dp_display.max_dp_lanes = dp->parser->max_dp_lanes;
  
  	dp_link_reset_phy_params_vx_px(dp->link);
  	rc = dp_ctrl_on_link(dp->ctrl);
  	if (rc) {
  		DRM_ERROR("failed to complete DP link training\n");
  		goto end;
  	}
  
  	dp_add_event(dp, EV_USER_NOTIFICATION, true, 0);
  
  
  end:
  	return rc;
  }
  
  static void dp_display_host_init(struct dp_display_private *dp)
  {
  	bool flip = false;
  
  	if (dp->core_initialized) {
  		DRM_DEBUG_DP("DP core already initialized\n");
  		return;
  	}
  
  	if (dp->usbpd->orientation == ORIENTATION_CC2)
  		flip = true;
  
  	dp_power_init(dp->power, flip);
  	dp_ctrl_host_init(dp->ctrl, flip);
  	dp_aux_init(dp->aux);
  	dp->core_initialized = true;
  }
  
  static void dp_display_host_deinit(struct dp_display_private *dp)
  {
  	if (!dp->core_initialized) {
  		DRM_DEBUG_DP("DP core not initialized\n");
  		return;
  	}
  
  	dp_ctrl_host_deinit(dp->ctrl);
  	dp_aux_deinit(dp->aux);
  	dp_power_deinit(dp->power);
  
  	dp->core_initialized = false;
  }
  
  static int dp_display_usbpd_configure_cb(struct device *dev)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  
  	if (!dev) {
  		DRM_ERROR("invalid dev\n");
  		rc = -EINVAL;
  		goto end;
  	}
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  	if (!dp) {
  		DRM_ERROR("no driver data found\n");
  		rc = -ENODEV;
  		goto end;
  	}
  
  	dp_display_host_init(dp);
  
  	/*
  	 * set sink to normal operation mode -- D0
  	 * before dpcd read
  	 */
  	dp_link_psm_config(dp->link, &dp->panel->link_info, false);
  	rc = dp_display_process_hpd_high(dp);
  end:
  	return rc;
  }
  
  static int dp_display_usbpd_disconnect_cb(struct device *dev)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  
  	if (!dev) {
  		DRM_ERROR("invalid dev\n");
  		rc = -EINVAL;
  		return rc;
  	}
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  	if (!dp) {
  		DRM_ERROR("no driver data found\n");
  		rc = -ENODEV;
  		return rc;
  	}
  
  	dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
  
  	return rc;
  }
  
  static void dp_display_handle_video_request(struct dp_display_private *dp)
  {
  	if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN) {
  		dp->panel->video_test = true;
  		dp_link_send_test_response(dp->link);
  	}
  }
  
  static int dp_display_handle_irq_hpd(struct dp_display_private *dp)
  {
  	u32 sink_request;
  
  	sink_request = dp->link->sink_request;
  
  	if (sink_request & DS_PORT_STATUS_CHANGED) {
  		dp_add_event(dp, EV_USER_NOTIFICATION, false, 0);
  		if (dp_display_is_sink_count_zero(dp)) {
  			DRM_DEBUG_DP("sink count is zero, nothing to do\n");
  			return 0;
  		}
  
  		return dp_display_process_hpd_high(dp);
  	}
  
  	dp_ctrl_handle_sink_request(dp->ctrl);
  
  	if (dp->link->sink_request & DP_TEST_LINK_VIDEO_PATTERN)
  		dp_display_handle_video_request(dp);
  
  	return 0;
  }
  
  static int dp_display_usbpd_attention_cb(struct device *dev)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  
  	if (!dev) {
  		DRM_ERROR("invalid dev\n");
  		return -EINVAL;
  	}
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  	if (!dp) {
  		DRM_ERROR("no driver data found\n");
  		return -ENODEV;
  	}
  
  	/* check for any test request issued by sink */
  	rc = dp_link_process_request(dp->link);
  	if (!rc)
  		dp_display_handle_irq_hpd(dp);
  
  	return rc;
  }
  
  static int dp_hpd_plug_handle(struct dp_display_private *dp, u32 data)
  {
  	struct dp_usbpd *hpd = dp->usbpd;
  	u32 state;
  	u32 tout = DP_TIMEOUT_5_SECOND;
  	int ret;
  
  	if (!hpd)
  		return 0;
  
  	mutex_lock(&dp->event_mutex);
  
  	state =  dp->hpd_state;
  	if (state == ST_SUSPEND_PENDING) {
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	if (state == ST_CONNECT_PENDING || state == ST_CONNECTED) {
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	if (state == ST_DISCONNECT_PENDING) {
  		/* wait until ST_DISCONNECTED */
  		dp_add_event(dp, EV_HPD_PLUG_INT, 0, 1); /* delay = 1 */
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	dp->hpd_state = ST_CONNECT_PENDING;
  
  	hpd->hpd_high = 1;
  
  	ret = dp_display_usbpd_configure_cb(&dp->pdev->dev);
  	if (ret) {	/* failed */
  		hpd->hpd_high = 0;
  		dp->hpd_state = ST_DISCONNECTED;
  	}
  
  	/* start sanity checking */
  	dp_add_event(dp, EV_CONNECT_PENDING_TIMEOUT, 0, tout);
  
  	mutex_unlock(&dp->event_mutex);
  
  	/* uevent will complete connection part */
  	return 0;
  };
  
  static int dp_display_enable(struct dp_display_private *dp, u32 data);
  static int dp_display_disable(struct dp_display_private *dp, u32 data);
  
  static int dp_connect_pending_timeout(struct dp_display_private *dp, u32 data)
  {
  	u32 state;
  
  	mutex_lock(&dp->event_mutex);
  
  	state = dp->hpd_state;
  	if (state == ST_CONNECT_PENDING) {
  		dp_display_enable(dp, 0);
  		dp->hpd_state = ST_CONNECTED;
  	}
  
  	mutex_unlock(&dp->event_mutex);
  
  	return 0;
  }
  
  static void dp_display_handle_plugged_change(struct msm_dp *dp_display,
  		bool plugged)
  {
  	struct dp_display_private *dp;
  
  	dp = container_of(dp_display,
  			struct dp_display_private, dp_display);
  
  	/* notify audio subsystem only if sink supports audio */
  	if (dp_display->plugged_cb && dp_display->codec_dev &&
  			dp->audio_supported)
  		dp_display->plugged_cb(dp_display->codec_dev, plugged);
  }
  
  static int dp_hpd_unplug_handle(struct dp_display_private *dp, u32 data)
  {
  	struct dp_usbpd *hpd = dp->usbpd;
  	u32 state;
  
  	if (!hpd)
  		return 0;
  
  	mutex_lock(&dp->event_mutex);
  
  	state = dp->hpd_state;
  	if (state == ST_SUSPEND_PENDING) {
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	if (state == ST_DISCONNECT_PENDING || state == ST_DISCONNECTED) {
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	if (state == ST_CONNECT_PENDING) {
  		/* wait until CONNECTED */
  		dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 1); /* delay = 1 */
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	dp->hpd_state = ST_DISCONNECT_PENDING;
  
  	/* disable HPD plug interrupt until disconnect is done */
  	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK
  				| DP_DP_IRQ_HPD_INT_MASK, false);
  
  	hpd->hpd_high = 0;
  
  	/*
  	 * We don't need separate work for disconnect as
  	 * connect/attention interrupts are disabled
  	 */
  	dp_display_usbpd_disconnect_cb(&dp->pdev->dev);
  
  	/* start sanity checking */
  	dp_add_event(dp, EV_DISCONNECT_PENDING_TIMEOUT, 0, DP_TIMEOUT_5_SECOND);
  
  	/* signal the disconnect event early to ensure proper teardown */
  	dp_display_handle_plugged_change(g_dp_display, false);
  
  	dp_catalog_hpd_config_intr(dp->catalog, DP_DP_HPD_PLUG_INT_MASK |
  					DP_DP_IRQ_HPD_INT_MASK, true);
  
  	/* uevent will complete disconnection part */
  	mutex_unlock(&dp->event_mutex);
  	return 0;
  }
  
  static int dp_disconnect_pending_timeout(struct dp_display_private *dp, u32 data)
  {
  	u32 state;
  
  	mutex_lock(&dp->event_mutex);
  
  	state =  dp->hpd_state;
  	if (state == ST_DISCONNECT_PENDING) {
  		dp_display_disable(dp, 0);
  		dp->hpd_state = ST_DISCONNECTED;
  	}
  
  	mutex_unlock(&dp->event_mutex);
  
  	return 0;
  }
  
  static int dp_irq_hpd_handle(struct dp_display_private *dp, u32 data)
  {
  	u32 state;
  
  	mutex_lock(&dp->event_mutex);
  
  	/* irq_hpd can happen at either connected or disconnected state */
  	state =  dp->hpd_state;
  	if (state == ST_SUSPEND_PENDING) {
  		mutex_unlock(&dp->event_mutex);
  		return 0;
  	}
  
  	dp_display_usbpd_attention_cb(&dp->pdev->dev);
  
  	mutex_unlock(&dp->event_mutex);
  
  	return 0;
  }
  
  static void dp_display_deinit_sub_modules(struct dp_display_private *dp)
  {
  	dp_debug_put(dp->debug);
  	dp_ctrl_put(dp->ctrl);
  	dp_panel_put(dp->panel);
  	dp_aux_put(dp->aux);
  	dp_audio_put(dp->audio);
  }
  
  static int dp_init_sub_modules(struct dp_display_private *dp)
  {
  	int rc = 0;
  	struct device *dev = &dp->pdev->dev;
  	struct dp_usbpd_cb *cb = &dp->usbpd_cb;
  	struct dp_panel_in panel_in = {
  		.dev = dev,
  	};
  
  	/* Callback APIs used for cable status change event */
  	cb->configure  = dp_display_usbpd_configure_cb;
  	cb->disconnect = dp_display_usbpd_disconnect_cb;
  	cb->attention  = dp_display_usbpd_attention_cb;
  
  	dp->usbpd = dp_hpd_get(dev, cb);
  	if (IS_ERR(dp->usbpd)) {
  		rc = PTR_ERR(dp->usbpd);
  		DRM_ERROR("failed to initialize hpd, rc = %d\n", rc);
  		dp->usbpd = NULL;
  		goto error;
  	}
  
  	dp->parser = dp_parser_get(dp->pdev);
  	if (IS_ERR(dp->parser)) {
  		rc = PTR_ERR(dp->parser);
  		DRM_ERROR("failed to initialize parser, rc = %d\n", rc);
  		dp->parser = NULL;
  		goto error;
  	}
  
  	dp->catalog = dp_catalog_get(dev, &dp->parser->io);
  	if (IS_ERR(dp->catalog)) {
  		rc = PTR_ERR(dp->catalog);
  		DRM_ERROR("failed to initialize catalog, rc = %d\n", rc);
  		dp->catalog = NULL;
  		goto error;
  	}
  
  	dp->power = dp_power_get(dp->parser);
  	if (IS_ERR(dp->power)) {
  		rc = PTR_ERR(dp->power);
  		DRM_ERROR("failed to initialize power, rc = %d\n", rc);
  		dp->power = NULL;
  		goto error;
  	}
  
  	dp->aux = dp_aux_get(dev, dp->catalog);
  	if (IS_ERR(dp->aux)) {
  		rc = PTR_ERR(dp->aux);
  		DRM_ERROR("failed to initialize aux, rc = %d\n", rc);
  		dp->aux = NULL;
  		goto error;
  	}
  
  	dp->link = dp_link_get(dev, dp->aux);
  	if (IS_ERR(dp->link)) {
  		rc = PTR_ERR(dp->link);
  		DRM_ERROR("failed to initialize link, rc = %d\n", rc);
  		dp->link = NULL;
  		goto error_link;
  	}
  
  	panel_in.aux = dp->aux;
  	panel_in.catalog = dp->catalog;
  	panel_in.link = dp->link;
  
  	dp->panel = dp_panel_get(&panel_in);
  	if (IS_ERR(dp->panel)) {
  		rc = PTR_ERR(dp->panel);
  		DRM_ERROR("failed to initialize panel, rc = %d\n", rc);
  		dp->panel = NULL;
  		goto error_link;
  	}
  
  	dp->ctrl = dp_ctrl_get(dev, dp->link, dp->panel, dp->aux,
  			       dp->power, dp->catalog, dp->parser);
  	if (IS_ERR(dp->ctrl)) {
  		rc = PTR_ERR(dp->ctrl);
  		DRM_ERROR("failed to initialize ctrl, rc = %d\n", rc);
  		dp->ctrl = NULL;
  		goto error_ctrl;
  	}
  
  	dp->audio = dp_audio_get(dp->pdev, dp->panel, dp->catalog);
  	if (IS_ERR(dp->audio)) {
  		rc = PTR_ERR(dp->audio);
  		pr_err("failed to initialize audio, rc = %d\n", rc);
  		dp->audio = NULL;
  		goto error_audio;
  	}
  
  	return rc;
  
  error_audio:
  	dp_ctrl_put(dp->ctrl);
  error_ctrl:
  	dp_panel_put(dp->panel);
  error_link:
  	dp_aux_put(dp->aux);
  error:
  	return rc;
  }
  
  static int dp_display_set_mode(struct msm_dp *dp_display,
  			       struct dp_display_mode *mode)
  {
  	struct dp_display_private *dp;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	dp->panel->dp_mode.drm_mode = mode->drm_mode;
  	dp->panel->dp_mode.bpp = mode->bpp;
  	dp->panel->dp_mode.capabilities = mode->capabilities;
  	dp_panel_init_panel_info(dp->panel);
  	return 0;
  }
  
  static int dp_display_prepare(struct msm_dp *dp)
  {
  	return 0;
  }
  
  static int dp_display_enable(struct dp_display_private *dp, u32 data)
  {
  	int rc = 0;
  	struct msm_dp *dp_display;
  
  	dp_display = g_dp_display;
  
  	rc = dp_ctrl_on_stream(dp->ctrl);
  	if (!rc)
  		dp_display->power_on = true;
  
  	return rc;
  }
  
  static int dp_display_post_enable(struct msm_dp *dp_display)
  {
  	struct dp_display_private *dp;
  	u32 rate;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	rate = dp->link->link_params.rate;
  
  	if (dp->audio_supported) {
  		dp->audio->bw_code = drm_dp_link_rate_to_bw_code(rate);
  		dp->audio->lane_count = dp->link->link_params.num_lanes;
  	}
  
  	/* signal the connect event late to synchronize video and display */
  	dp_display_handle_plugged_change(dp_display, true);
  	return 0;
  }
  
  static int dp_display_disable(struct dp_display_private *dp, u32 data)
  {
  	struct msm_dp *dp_display;
  
  	dp_display = g_dp_display;
  
  	/* wait only if audio was enabled */
  	if (dp_display->audio_enabled) {
  		/* signal the disconnect event */
  		dp_display_handle_plugged_change(dp_display, false);
  		if (!wait_for_completion_timeout(&dp->audio_comp,
  				HZ * 5))
  			DRM_ERROR("audio comp timeout\n");
  	}
  
  	dp_display->audio_enabled = false;
  
  	dp_ctrl_off(dp->ctrl);
  
  	dp->core_initialized = false;
  
  	dp_display->power_on = false;
  
  	return 0;
  }
  
  static int dp_display_unprepare(struct msm_dp *dp)
  {
  	return 0;
  }
  
  int dp_display_set_plugged_cb(struct msm_dp *dp_display,
  		hdmi_codec_plugged_cb fn, struct device *codec_dev)
  {
  	bool plugged;
  
  	dp_display->plugged_cb = fn;
  	dp_display->codec_dev = codec_dev;
  	plugged = dp_display->is_connected;
  	dp_display_handle_plugged_change(dp_display, plugged);
  
  	return 0;
  }
  
  int dp_display_validate_mode(struct msm_dp *dp, u32 mode_pclk_khz)
  {
  	const u32 num_components = 3, default_bpp = 24;
  	struct dp_display_private *dp_display;
  	struct dp_link_info *link_info;
  	u32 mode_rate_khz = 0, supported_rate_khz = 0, mode_bpp = 0;
  
  	if (!dp || !mode_pclk_khz || !dp->connector) {
  		DRM_ERROR("invalid params\n");
  		return -EINVAL;
  	}
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  	link_info = &dp_display->panel->link_info;
  
  	mode_bpp = dp->connector->display_info.bpc * num_components;
  	if (!mode_bpp)
  		mode_bpp = default_bpp;
  
  	mode_bpp = dp_panel_get_mode_bpp(dp_display->panel,
  			mode_bpp, mode_pclk_khz);
  
  	mode_rate_khz = mode_pclk_khz * mode_bpp;
  	supported_rate_khz = link_info->num_lanes * link_info->rate * 8;
  
  	if (mode_rate_khz > supported_rate_khz)
  		return MODE_BAD;
  
  	return MODE_OK;
  }
  
  int dp_display_get_modes(struct msm_dp *dp,
  				struct dp_display_mode *dp_mode)
  {
  	struct dp_display_private *dp_display;
  	int ret = 0;
  
  	if (!dp) {
  		DRM_ERROR("invalid params\n");
  		return 0;
  	}
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	ret = dp_panel_get_modes(dp_display->panel,
  		dp->connector, dp_mode);
  	if (dp_mode->drm_mode.clock)
  		dp->max_pclk_khz = dp_mode->drm_mode.clock;
  	return ret;
  }
  
  bool dp_display_check_video_test(struct msm_dp *dp)
  {
  	struct dp_display_private *dp_display;
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	return dp_display->panel->video_test;
  }
  
  int dp_display_get_test_bpp(struct msm_dp *dp)
  {
  	struct dp_display_private *dp_display;
  
  	if (!dp) {
  		DRM_ERROR("invalid params\n");
  		return 0;
  	}
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	return dp_link_bit_depth_to_bpp(
  		dp_display->link->test_video.test_bit_depth);
  }
  
  static void dp_display_config_hpd(struct dp_display_private *dp)
  {
  
  	dp_display_host_init(dp);
  	dp_catalog_ctrl_hpd_config(dp->catalog);
  
  	/* Enable interrupt first time
  	 * we are leaving dp clocks on during disconnect
  	 * and never disable interrupt
  	 */
  	enable_irq(dp->irq);
  }
  
  static int hpd_event_thread(void *data)
  {
  	struct dp_display_private *dp_priv;
  	unsigned long flag;
  	struct dp_event *todo;
  	int timeout_mode = 0;
  
  	dp_priv = (struct dp_display_private *)data;
  
  	while (1) {
  		if (timeout_mode) {
  			wait_event_timeout(dp_priv->event_q,
  				(dp_priv->event_pndx == dp_priv->event_gndx),
  						EVENT_TIMEOUT);
  		} else {
  			wait_event_interruptible(dp_priv->event_q,
  				(dp_priv->event_pndx != dp_priv->event_gndx));
  		}
  		spin_lock_irqsave(&dp_priv->event_lock, flag);
  		todo = &dp_priv->event_list[dp_priv->event_gndx];
  		if (todo->delay) {
  			struct dp_event *todo_next;
  
  			dp_priv->event_gndx++;
  			dp_priv->event_gndx %= DP_EVENT_Q_MAX;
  
  			/* re enter delay event into q */
  			todo_next = &dp_priv->event_list[dp_priv->event_pndx++];
  			dp_priv->event_pndx %= DP_EVENT_Q_MAX;
  			todo_next->event_id = todo->event_id;
  			todo_next->data = todo->data;
  			todo_next->delay = todo->delay - 1;
  
  			/* clean up older event */
  			todo->event_id = EV_NO_EVENT;
  			todo->delay = 0;
  
  			/* switch to timeout mode */
  			timeout_mode = 1;
  			spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  			continue;
  		}
  
  		/* timeout with no events in q */
  		if (dp_priv->event_pndx == dp_priv->event_gndx) {
  			spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  			continue;
  		}
  
  		dp_priv->event_gndx++;
  		dp_priv->event_gndx %= DP_EVENT_Q_MAX;
  		timeout_mode = 0;
  		spin_unlock_irqrestore(&dp_priv->event_lock, flag);
  
  		switch (todo->event_id) {
  		case EV_HPD_INIT_SETUP:
  			dp_display_config_hpd(dp_priv);
  			break;
  		case EV_HPD_PLUG_INT:
  			dp_hpd_plug_handle(dp_priv, todo->data);
  			break;
  		case EV_HPD_UNPLUG_INT:
  			dp_hpd_unplug_handle(dp_priv, todo->data);
  			break;
  		case EV_IRQ_HPD_INT:
  			dp_irq_hpd_handle(dp_priv, todo->data);
  			break;
  		case EV_HPD_REPLUG_INT:
  			/* do nothing */
  			break;
  		case EV_USER_NOTIFICATION:
  			dp_display_send_hpd_notification(dp_priv,
  						todo->data);
  			break;
  		case EV_CONNECT_PENDING_TIMEOUT:
  			dp_connect_pending_timeout(dp_priv,
  						todo->data);
  			break;
  		case EV_DISCONNECT_PENDING_TIMEOUT:
  			dp_disconnect_pending_timeout(dp_priv,
  						todo->data);
  			break;
  		default:
  			break;
  		}
  	}
  
  	return 0;
  }
  
  static void dp_hpd_event_setup(struct dp_display_private *dp_priv)
  {
  	init_waitqueue_head(&dp_priv->event_q);
  	spin_lock_init(&dp_priv->event_lock);
  
  	kthread_run(hpd_event_thread, dp_priv, "dp_hpd_handler");
  }
  
  static irqreturn_t dp_display_irq_handler(int irq, void *dev_id)
  {
  	struct dp_display_private *dp = dev_id;
  	irqreturn_t ret = IRQ_HANDLED;
  	u32 hpd_isr_status;
  
  	if (!dp) {
  		DRM_ERROR("invalid data\n");
  		return IRQ_NONE;
  	}
  
  	hpd_isr_status = dp_catalog_hpd_get_intr_status(dp->catalog);
  
  	if (hpd_isr_status & 0x0F) {
  		/* hpd related interrupts */
  		if (hpd_isr_status & DP_DP_HPD_PLUG_INT_MASK ||
  			hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK) {
  			dp_add_event(dp, EV_HPD_PLUG_INT, 0, 0);
  		}
  
  		if (hpd_isr_status & DP_DP_IRQ_HPD_INT_MASK) {
  			/* delete connect pending event first */
  			dp_del_event(dp, EV_CONNECT_PENDING_TIMEOUT);
  			dp_add_event(dp, EV_IRQ_HPD_INT, 0, 0);
  		}
  
  		if (hpd_isr_status & DP_DP_HPD_REPLUG_INT_MASK)
  			dp_add_event(dp, EV_HPD_REPLUG_INT, 0, 0);
  
  		if (hpd_isr_status & DP_DP_HPD_UNPLUG_INT_MASK)
  			dp_add_event(dp, EV_HPD_UNPLUG_INT, 0, 0);
  	}
  
  	/* DP controller isr */
  	dp_ctrl_isr(dp->ctrl);
  
  	/* DP aux isr */
  	dp_aux_isr(dp->aux);
  
  	return ret;
  }
  
  int dp_display_request_irq(struct msm_dp *dp_display)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  
  	if (!dp_display) {
  		DRM_ERROR("invalid input\n");
  		return -EINVAL;
  	}
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	dp->irq = irq_of_parse_and_map(dp->pdev->dev.of_node, 0);
  	if (dp->irq < 0) {
  		rc = dp->irq;
  		DRM_ERROR("failed to get irq: %d\n", rc);
  		return rc;
  	}
  
  	rc = devm_request_irq(&dp->pdev->dev, dp->irq,
  			dp_display_irq_handler,
  			IRQF_TRIGGER_HIGH, "dp_display_isr", dp);
  	if (rc < 0) {
  		DRM_ERROR("failed to request IRQ%u: %d\n",
  				dp->irq, rc);
  		return rc;
  	}
  	disable_irq(dp->irq);
  
  	return 0;
  }
  
  static int dp_display_probe(struct platform_device *pdev)
  {
  	int rc = 0;
  	struct dp_display_private *dp;
  
  	if (!pdev || !pdev->dev.of_node) {
  		DRM_ERROR("pdev not found\n");
  		return -ENODEV;
  	}
  
  	dp = devm_kzalloc(&pdev->dev, sizeof(*dp), GFP_KERNEL);
  	if (!dp)
  		return -ENOMEM;
  
  	dp->pdev = pdev;
  	dp->name = "drm_dp";
  
  	rc = dp_init_sub_modules(dp);
  	if (rc) {
  		DRM_ERROR("init sub module failed\n");
  		return -EPROBE_DEFER;
  	}
  
  	mutex_init(&dp->event_mutex);
  	g_dp_display = &dp->dp_display;
  
  	/* Store DP audio handle inside DP display */
  	g_dp_display->dp_audio = dp->audio;
  
  	init_completion(&dp->audio_comp);
  
  	platform_set_drvdata(pdev, g_dp_display);
  
  	rc = component_add(&pdev->dev, &dp_display_comp_ops);
  	if (rc) {
  		DRM_ERROR("component add failed, rc=%d\n", rc);
  		dp_display_deinit_sub_modules(dp);
  	}
  
  	return rc;
  }
  
  static int dp_display_remove(struct platform_device *pdev)
  {
  	struct dp_display_private *dp;
  
  	dp = container_of(g_dp_display,
  			struct dp_display_private, dp_display);
  
  	dp_display_deinit_sub_modules(dp);
  
  	component_del(&pdev->dev, &dp_display_comp_ops);
  	platform_set_drvdata(pdev, NULL);
  
  	return 0;
  }
  
  static int dp_pm_resume(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct msm_dp *dp_display = platform_get_drvdata(pdev);
  	struct dp_display_private *dp;
  	u32 status;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	mutex_lock(&dp->event_mutex);
  
  	/* start from disconnected state */
  	dp->hpd_state = ST_DISCONNECTED;
  
  	/* turn on dp ctrl/phy */
  	dp_display_host_init(dp);
  
  	dp_catalog_ctrl_hpd_config(dp->catalog);
  
  	status = dp_catalog_hpd_get_state_status(dp->catalog);
  
  	if (status) {
  		dp->dp_display.is_connected = true;
  	} else {
  		dp->dp_display.is_connected = false;
  		/* make sure next resume host_init be called */
  		dp->core_initialized = false;
  	}
  
  	mutex_unlock(&dp->event_mutex);
  
  	return 0;
  }
  
  static int dp_pm_suspend(struct device *dev)
  {
  	struct platform_device *pdev = to_platform_device(dev);
  	struct msm_dp *dp_display = platform_get_drvdata(pdev);
  	struct dp_display_private *dp;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	mutex_lock(&dp->event_mutex);
  
  	if (dp->core_initialized == true)
  		dp_display_host_deinit(dp);
  
  	dp->hpd_state = ST_SUSPENDED;
  
  	mutex_unlock(&dp->event_mutex);
  
  	return 0;
  }
  
  static int dp_pm_prepare(struct device *dev)
  {
  	return 0;
  }
  
  static void dp_pm_complete(struct device *dev)
  {
  
  }
  
  static const struct dev_pm_ops dp_pm_ops = {
  	.suspend = dp_pm_suspend,
  	.resume =  dp_pm_resume,
  	.prepare = dp_pm_prepare,
  	.complete = dp_pm_complete,
  };
  
  static struct platform_driver dp_display_driver = {
  	.probe  = dp_display_probe,
  	.remove = dp_display_remove,
  	.driver = {
  		.name = "msm-dp-display",
  		.of_match_table = dp_dt_match,
  		.suppress_bind_attrs = true,
  		.pm = &dp_pm_ops,
  	},
  };
  
  int __init msm_dp_register(void)
  {
  	int ret;
  
  	ret = platform_driver_register(&dp_display_driver);
  	if (ret)
  		DRM_ERROR("Dp display driver register failed");
  
  	return ret;
  }
  
  void __exit msm_dp_unregister(void)
  {
  	platform_driver_unregister(&dp_display_driver);
  }
  
  void msm_dp_irq_postinstall(struct msm_dp *dp_display)
  {
  	struct dp_display_private *dp;
  
  	if (!dp_display)
  		return;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  
  	dp_hpd_event_setup(dp);
  
  	dp_add_event(dp, EV_HPD_INIT_SETUP, 0, 100);
  }
  
  void msm_dp_debugfs_init(struct msm_dp *dp_display, struct drm_minor *minor)
  {
  	struct dp_display_private *dp;
  	struct device *dev;
  	int rc;
  
  	dp = container_of(dp_display, struct dp_display_private, dp_display);
  	dev = &dp->pdev->dev;
  
  	dp->debug = dp_debug_get(dev, dp->panel, dp->usbpd,
  					dp->link, &dp->dp_display.connector,
  					minor);
  	if (IS_ERR(dp->debug)) {
  		rc = PTR_ERR(dp->debug);
  		DRM_ERROR("failed to initialize debug, rc = %d\n", rc);
  		dp->debug = NULL;
  	}
  }
  
  int msm_dp_modeset_init(struct msm_dp *dp_display, struct drm_device *dev,
  			struct drm_encoder *encoder)
  {
  	struct msm_drm_private *priv;
  	int ret;
  
  	if (WARN_ON(!encoder) || WARN_ON(!dp_display) || WARN_ON(!dev))
  		return -EINVAL;
  
  	priv = dev->dev_private;
  	dp_display->drm_dev = dev;
  
  	ret = dp_display_request_irq(dp_display);
  	if (ret) {
  		DRM_ERROR("request_irq failed, ret=%d\n", ret);
  		return ret;
  	}
  
  	dp_display->encoder = encoder;
  
  	dp_display->connector = dp_drm_connector_init(dp_display);
  	if (IS_ERR(dp_display->connector)) {
  		ret = PTR_ERR(dp_display->connector);
  		DRM_DEV_ERROR(dev->dev,
  			"failed to create dp connector: %d\n", ret);
  		dp_display->connector = NULL;
  		return ret;
  	}
  
  	priv->connectors[priv->num_connectors++] = dp_display->connector;
  	return 0;
  }
  
  int msm_dp_display_enable(struct msm_dp *dp, struct drm_encoder *encoder)
  {
  	int rc = 0;
  	struct dp_display_private *dp_display;
  	u32 state;
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  	if (!dp_display->dp_mode.drm_mode.clock) {
  		DRM_ERROR("invalid params\n");
  		return -EINVAL;
  	}
  
  	mutex_lock(&dp_display->event_mutex);
  
  	dp_del_event(dp_display, EV_CONNECT_PENDING_TIMEOUT);
  
  	rc = dp_display_set_mode(dp, &dp_display->dp_mode);
  	if (rc) {
  		DRM_ERROR("Failed to perform a mode set, rc=%d\n", rc);
  		mutex_unlock(&dp_display->event_mutex);
  		return rc;
  	}
  
  	rc = dp_display_prepare(dp);
  	if (rc) {
  		DRM_ERROR("DP display prepare failed, rc=%d\n", rc);
  		mutex_unlock(&dp_display->event_mutex);
  		return rc;
  	}
  
  	state =  dp_display->hpd_state;
  
  	if (state == ST_SUSPEND_PENDING)
  		dp_display_host_init(dp_display);
  
  	dp_display_enable(dp_display, 0);
  
  	rc = dp_display_post_enable(dp);
  	if (rc) {
  		DRM_ERROR("DP display post enable failed, rc=%d\n", rc);
  		dp_display_disable(dp_display, 0);
  		dp_display_unprepare(dp);
  	}
  
  	if (state == ST_SUSPEND_PENDING)
  		dp_add_event(dp_display, EV_IRQ_HPD_INT, 0, 0);
  
  	/* completed connection */
  	dp_display->hpd_state = ST_CONNECTED;
  
  	mutex_unlock(&dp_display->event_mutex);
  
  	return rc;
  }
  
  int msm_dp_display_pre_disable(struct msm_dp *dp, struct drm_encoder *encoder)
  {
  	struct dp_display_private *dp_display;
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	dp_ctrl_push_idle(dp_display->ctrl);
  
  	return 0;
  }
  
  int msm_dp_display_disable(struct msm_dp *dp, struct drm_encoder *encoder)
  {
  	int rc = 0;
  	u32 state;
  	struct dp_display_private *dp_display;
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	mutex_lock(&dp_display->event_mutex);
  
  	dp_del_event(dp_display, EV_DISCONNECT_PENDING_TIMEOUT);
  
  	dp_display_disable(dp_display, 0);
  
  	rc = dp_display_unprepare(dp);
  	if (rc)
  		DRM_ERROR("DP display unprepare failed, rc=%d\n", rc);
  
  	state =  dp_display->hpd_state;
  	if (state == ST_DISCONNECT_PENDING) {
  		/* completed disconnection */
  		dp_display->hpd_state = ST_DISCONNECTED;
  	} else {
  		dp_display->hpd_state = ST_SUSPEND_PENDING;
  	}
  
  	mutex_unlock(&dp_display->event_mutex);
  	return rc;
  }
  
  void msm_dp_display_mode_set(struct msm_dp *dp, struct drm_encoder *encoder,
  				struct drm_display_mode *mode,
  				struct drm_display_mode *adjusted_mode)
  {
  	struct dp_display_private *dp_display;
  
  	dp_display = container_of(dp, struct dp_display_private, dp_display);
  
  	memset(&dp_display->dp_mode, 0x0, sizeof(struct dp_display_mode));
  
  	if (dp_display_check_video_test(dp))
  		dp_display->dp_mode.bpp = dp_display_get_test_bpp(dp);
  	else /* Default num_components per pixel = 3 */
  		dp_display->dp_mode.bpp = dp->connector->display_info.bpc * 3;
  
  	if (!dp_display->dp_mode.bpp)
  		dp_display->dp_mode.bpp = 24; /* Default bpp */
  
  	drm_mode_copy(&dp_display->dp_mode.drm_mode, adjusted_mode);
  
  	dp_display->dp_mode.v_active_low =
  		!!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NVSYNC);
  
  	dp_display->dp_mode.h_active_low =
  		!!(dp_display->dp_mode.drm_mode.flags & DRM_MODE_FLAG_NHSYNC);
  }
  