[linux-2.6-block.git] / drivers / gpu / drm / drm_probe_helper.c

/*
 * Copyright (c) 2006-2008 Intel Corporation
 * Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
 *
 * DRM core CRTC related functions
 *
 * Permission to use, copy, modify, distribute, and sell this software and its
 * documentation for any purpose is hereby granted without fee, provided that
 * the above copyright notice appear in all copies and that both that copyright
 * notice and this permission notice appear in supporting documentation, and
 * that the name of the copyright holders not be used in advertising or
 * publicity pertaining to distribution of the software without specific,
 * written prior permission.  The copyright holders make no representations
 * about the suitability of this software for any purpose.  It is provided "as
 * is" without express or implied warranty.
 *
 * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
 * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
 * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
 * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
 * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
 * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
 * OF THIS SOFTWARE.
 *
 * Authors:
 *      Keith Packard
 *	Eric Anholt <eric@anholt.net>
 *      Dave Airlie <airlied@linux.ie>
 *      Jesse Barnes <jesse.barnes@intel.com>
 */

#include <linux/export.h>
#include <linux/moduleparam.h>

#include <drm/drmP.h>
#include <drm/drm_crtc.h>
#include <drm/drm_fourcc.h>
#include <drm/drm_crtc_helper.h>
#include <drm/drm_fb_helper.h>
#include <drm/drm_edid.h>

/**
 * DOC: output probing helper overview
 *
 * This library provides some helper code for output probing. It provides an
 * implementation of the core connector->fill_modes interface with
 * drm_helper_probe_single_connector_modes.
 *
 * It also provides support for polling connectors with a work item and for
 * generic hotplug interrupt handling where the driver doesn't or cannot keep
 * track of a per-connector hpd interrupt.
 *
 * This helper library can be used independently of the modeset helper library.
 * Drivers can also overwrite different parts e.g. use their own hotplug
 * handling code to avoid probing unrelated outputs.
 */

static bool drm_kms_helper_poll = true;
module_param_named(poll, drm_kms_helper_poll, bool, 0600);

static void drm_mode_validate_flag(struct drm_connector *connector,
				   int flags)
{
	struct drm_display_mode *mode;

	if (flags == (DRM_MODE_FLAG_DBLSCAN | DRM_MODE_FLAG_INTERLACE |
		      DRM_MODE_FLAG_3D_MASK))
		return;

	list_for_each_entry(mode, &connector->modes, head) {
		if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
				!(flags & DRM_MODE_FLAG_INTERLACE))
			mode->status = MODE_NO_INTERLACE;
		if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
				!(flags & DRM_MODE_FLAG_DBLSCAN))
			mode->status = MODE_NO_DBLESCAN;
		if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
				!(flags & DRM_MODE_FLAG_3D_MASK))
			mode->status = MODE_NO_STEREO;
	}

	return;
}

static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
{
	struct drm_display_mode *mode;

	if (!connector->cmdline_mode.specified)
		return 0;

	mode = drm_mode_create_from_cmdline_mode(connector->dev,
						 &connector->cmdline_mode);
	if (mode == NULL)
		return 0;

	drm_mode_probed_add(connector, mode);
	return 1;
}

static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
							      uint32_t maxX, uint32_t maxY, bool merge_type_bits)
{
	struct drm_device *dev = connector->dev;
	struct drm_display_mode *mode;
	struct drm_connector_helper_funcs *connector_funcs =
		connector->helper_private;
	int count = 0;
	int mode_flags = 0;
	bool verbose_prune = true;

	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
			connector->name);
	/* set all modes to the unverified state */
	list_for_each_entry(mode, &connector->modes, head)
		mode->status = MODE_UNVERIFIED;

	if (connector->force) {
		if (connector->force == DRM_FORCE_ON)
			connector->status = connector_status_connected;
		else
			connector->status = connector_status_disconnected;
		if (connector->funcs->force)
			connector->funcs->force(connector);
	} else {
		connector->status = connector->funcs->detect(connector, true);
	}

	/* Re-enable polling in case the global poll config changed. */
	if (drm_kms_helper_poll != dev->mode_config.poll_running)
		drm_kms_helper_poll_enable(dev);

	dev->mode_config.poll_running = drm_kms_helper_poll;

	if (connector->status == connector_status_disconnected) {
		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
			connector->base.id, connector->name);
		drm_mode_connector_update_edid_property(connector, NULL);
		verbose_prune = false;
		goto prune;
	}

#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
	count = drm_load_edid_firmware(connector);
	if (count == 0)
#endif
	{
		if (connector->override_edid) {
			struct edid *edid = (struct edid *) connector->edid_blob_ptr->data;

			count = drm_add_edid_modes(connector, edid);
		} else
			count = (*connector_funcs->get_modes)(connector);
	}

	if (count == 0 && connector->status == connector_status_connected)
		count = drm_add_modes_noedid(connector, 1024, 768);
	count += drm_helper_probe_add_cmdline_mode(connector);
	if (count == 0)
		goto prune;

	drm_mode_connector_list_update(connector, merge_type_bits);

	if (maxX && maxY)
		drm_mode_validate_size(dev, &connector->modes, maxX, maxY);

	if (connector->interlace_allowed)
		mode_flags |= DRM_MODE_FLAG_INTERLACE;
	if (connector->doublescan_allowed)
		mode_flags |= DRM_MODE_FLAG_DBLSCAN;
	if (connector->stereo_allowed)
		mode_flags |= DRM_MODE_FLAG_3D_MASK;
	drm_mode_validate_flag(connector, mode_flags);

	list_for_each_entry(mode, &connector->modes, head) {
		if (mode->status == MODE_OK && connector_funcs->mode_valid)
			mode->status = connector_funcs->mode_valid(connector,
								   mode);
	}

prune:
	drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);

	if (list_empty(&connector->modes))
		return 0;

	list_for_each_entry(mode, &connector->modes, head)
		mode->vrefresh = drm_mode_vrefresh(mode);

	drm_mode_sort(&connector->modes);

	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
			connector->name);
	list_for_each_entry(mode, &connector->modes, head) {
		drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
		drm_mode_debug_printmodeline(mode);
	}

	return count;
}

/**
 * drm_helper_probe_single_connector_modes - get complete set of display modes
 * @connector: connector to probe
 * @maxX: max width for modes
 * @maxY: max height for modes
 *
 * Based on the helper callbacks implemented by @connector try to detect all
 * valid modes.  Modes will first be added to the connector's probed_modes list,
 * then culled (based on validity and the @maxX, @maxY parameters) and put into
 * the normal modes list.
 *
 * Intended to be use as a generic implementation of the ->fill_modes()
 * @connector vfunc for drivers that use the crtc helpers for output mode
 * filtering and detection.
 *
 * Returns:
 * The number of modes found on @connector.
 */
int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
					    uint32_t maxX, uint32_t maxY)
{
	return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
}
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);

/**
 * drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes
 * @connector: connector to probe
 * @maxX: max width for modes
 * @maxY: max height for modes
 *
 * This operates like drm_hehlper_probe_single_connector_modes except it
 * replaces the mode bits instead of merging them for preferred modes.
 */
int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
					    uint32_t maxX, uint32_t maxY)
{
	return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
}
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);

/**
 * drm_kms_helper_hotplug_event - fire off KMS hotplug events
 * @dev: drm_device whose connector state changed
 *
 * This function fires off the uevent for userspace and also calls the
 * output_poll_changed function, which is most commonly used to inform the fbdev
 * emulation code and allow it to update the fbcon output configuration.
 *
 * Drivers should call this from their hotplug handling code when a change is
 * detected. Note that this function does not do any output detection of its
 * own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
 * driver already.
 *
 * This function must be called from process context with no mode
 * setting locks held.
 */
void drm_kms_helper_hotplug_event(struct drm_device *dev)
{
	/* send a uevent + call fbdev */
	drm_sysfs_hotplug_event(dev);
	if (dev->mode_config.funcs->output_poll_changed)
		dev->mode_config.funcs->output_poll_changed(dev);
}
EXPORT_SYMBOL(drm_kms_helper_hotplug_event);

#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
static void output_poll_execute(struct work_struct *work)
{
	struct delayed_work *delayed_work = to_delayed_work(work);
	struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
	struct drm_connector *connector;
	enum drm_connector_status old_status;
	bool repoll = false, changed = false;

	if (!drm_kms_helper_poll)
		return;

	mutex_lock(&dev->mode_config.mutex);
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		/* Ignore forced connectors. */
		if (connector->force)
			continue;

		/* Ignore HPD capable connectors and connectors where we don't
		 * want any hotplug detection at all for polling. */
		if (!connector->polled || connector->polled == DRM_CONNECTOR_POLL_HPD)
			continue;

		repoll = true;

		old_status = connector->status;
		/* if we are connected and don't want to poll for disconnect
		   skip it */
		if (old_status == connector_status_connected &&
		    !(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
			continue;

		connector->status = connector->funcs->detect(connector, false);
		if (old_status != connector->status) {
			const char *old, *new;

			old = drm_get_connector_status_name(old_status);
			new = drm_get_connector_status_name(connector->status);

			DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
				      "status updated from %s to %s\n",
				      connector->base.id,
				      connector->name,
				      old, new);

			changed = true;
		}
	}

	mutex_unlock(&dev->mode_config.mutex);

	if (changed)
		drm_kms_helper_hotplug_event(dev);

	if (repoll)
		schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
}

/**
 * drm_kms_helper_poll_disable - disable output polling
 * @dev: drm_device
 *
 * This function disables the output polling work.
 *
 * Drivers can call this helper from their device suspend implementation. It is
 * not an error to call this even when output polling isn't enabled or arlready
 * disabled.
 */
void drm_kms_helper_poll_disable(struct drm_device *dev)
{
	if (!dev->mode_config.poll_enabled)
		return;
	cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
}
EXPORT_SYMBOL(drm_kms_helper_poll_disable);

/**
 * drm_kms_helper_poll_enable - re-enable output polling.
 * @dev: drm_device
 *
 * This function re-enables the output polling work.
 *
 * Drivers can call this helper from their device resume implementation. It is
 * an error to call this when the output polling support has not yet been set
 * up.
 */
void drm_kms_helper_poll_enable(struct drm_device *dev)
{
	bool poll = false;
	struct drm_connector *connector;

	if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
		return;

	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
		if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
					 DRM_CONNECTOR_POLL_DISCONNECT))
			poll = true;
	}

	if (poll)
		schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
}
EXPORT_SYMBOL(drm_kms_helper_poll_enable);

/**
 * drm_kms_helper_poll_init - initialize and enable output polling
 * @dev: drm_device
 *
 * This function intializes and then also enables output polling support for
 * @dev. Drivers which do not have reliable hotplug support in hardware can use
 * this helper infrastructure to regularly poll such connectors for changes in
 * their connection state.
 *
 * Drivers can control which connectors are polled by setting the
 * DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
 * connectors where probing live outputs can result in visual distortion drivers
 * should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
 * Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
 * completely ignored by the polling logic.
 *
 * Note that a connector can be both polled and probed from the hotplug handler,
 * in case the hotplug interrupt is known to be unreliable.
 */
void drm_kms_helper_poll_init(struct drm_device *dev)
{
	INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
	dev->mode_config.poll_enabled = true;

	drm_kms_helper_poll_enable(dev);
}
EXPORT_SYMBOL(drm_kms_helper_poll_init);

/**
 * drm_kms_helper_poll_fini - disable output polling and clean it up
 * @dev: drm_device
 */
void drm_kms_helper_poll_fini(struct drm_device *dev)
{
	drm_kms_helper_poll_disable(dev);
}
EXPORT_SYMBOL(drm_kms_helper_poll_fini);

/**
 * drm_helper_hpd_irq_event - hotplug processing
 * @dev: drm_device
 *
 * Drivers can use this helper function to run a detect cycle on all connectors
 * which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
 * other connectors are ignored, which is useful to avoid reprobing fixed
 * panels.
 *
 * This helper function is useful for drivers which can't or don't track hotplug
 * interrupts for each connector.
 *
 * Drivers which support hotplug interrupts for each connector individually and
 * which have a more fine-grained detect logic should bypass this code and
 * directly call drm_kms_helper_hotplug_event() in case the connector state
 * changed.
 *
 * This function must be called from process context with no mode
 * setting locks held.
 *
 * Note that a connector can be both polled and probed from the hotplug handler,
 * in case the hotplug interrupt is known to be unreliable.
 */
bool drm_helper_hpd_irq_event(struct drm_device *dev)
{
	struct drm_connector *connector;
	enum drm_connector_status old_status;
	bool changed = false;

	if (!dev->mode_config.poll_enabled)
		return false;

	mutex_lock(&dev->mode_config.mutex);
	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {

		/* Only handle HPD capable connectors. */
		if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
			continue;

		old_status = connector->status;

		connector->status = connector->funcs->detect(connector, false);
		DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
			      connector->base.id,
			      connector->name,
			      drm_get_connector_status_name(old_status),
			      drm_get_connector_status_name(connector->status));
		if (old_status != connector->status)
			changed = true;
	}

	mutex_unlock(&dev->mode_config.mutex);

	if (changed)
		drm_kms_helper_hotplug_event(dev);

	return changed;
}
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
Commit	Line	Data
8d754544 DV	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
	58	static bool drm_kms_helper_poll = true;
	59	module_param_named(poll, drm_kms_helper_poll, bool, 0600);
	60
	61	static 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
eaf99c74 CW	85	static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
	86	{
	87	struct drm_display_mode *mode;
	88
	89	if (!connector->cmdline_mode.specified)
	90	return 0;
	91
	92	mode = drm_mode_create_from_cmdline_mode(connector->dev,
	93	&connector->cmdline_mode);
	94	if (mode == NULL)
	95	return 0;
	96
	97	drm_mode_probed_add(connector, mode);
	98	return 1;
	99	}
	100
b87577b7 DA	101	static int drm_helper_probe_single_connector_modes_merge_bits(struct drm_connector *connector,
b87577b7 DA	102	uint32_t maxX, uint32_t maxY, bool merge_type_bits)
8d754544 DV	103	{
	104	struct drm_device *dev = connector->dev;
	105	struct drm_display_mode *mode;
	106	struct drm_connector_helper_funcs *connector_funcs =
	107	connector->helper_private;
	108	int count = 0;
	109	int mode_flags = 0;
	110	bool verbose_prune = true;
	111
	112	WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
	113
	114	DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
25933820	115	connector->name);
8d754544 DV	116	/* set all modes to the unverified state */
	117	list_for_each_entry(mode, &connector->modes, head)
	118	mode->status = MODE_UNVERIFIED;
	119
	120	if (connector->force) {
	121	if (connector->force == DRM_FORCE_ON)
	122	connector->status = connector_status_connected;
	123	else
	124	connector->status = connector_status_disconnected;
	125	if (connector->funcs->force)
	126	connector->funcs->force(connector);
	127	} else {
	128	connector->status = connector->funcs->detect(connector, true);
	129	}
	130
	131	/* Re-enable polling in case the global poll config changed. */
	132	if (drm_kms_helper_poll != dev->mode_config.poll_running)
	133	drm_kms_helper_poll_enable(dev);
	134
	135	dev->mode_config.poll_running = drm_kms_helper_poll;
	136
	137	if (connector->status == connector_status_disconnected) {
	138	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
25933820	139	connector->base.id, connector->name);
8d754544 DV	140	drm_mode_connector_update_edid_property(connector, NULL);
	141	verbose_prune = false;
	142	goto prune;
	143	}
	144
	145	#ifdef CONFIG_DRM_LOAD_EDID_FIRMWARE
	146	count = drm_load_edid_firmware(connector);
	147	if (count == 0)
	148	#endif
4cf2b281 TW	149	{
	150	if (connector->override_edid) {
	151	struct edid edid = (struct edid ) connector->edid_blob_ptr->data;
	152
	153	count = drm_add_edid_modes(connector, edid);
	154	} else
	155	count = (*connector_funcs->get_modes)(connector);
	156	}
8d754544 DV	157
	158	if (count == 0 && connector->status == connector_status_connected)
	159	count = drm_add_modes_noedid(connector, 1024, 768);
eaf99c74	160	count += drm_helper_probe_add_cmdline_mode(connector);
8d754544 DV	161	if (count == 0)
	162	goto prune;
	163
b87577b7	164	drm_mode_connector_list_update(connector, merge_type_bits);
8d754544 DV	165
	166	if (maxX && maxY)
	167	drm_mode_validate_size(dev, &connector->modes, maxX, maxY);
	168
	169	if (connector->interlace_allowed)
	170	mode_flags \|= DRM_MODE_FLAG_INTERLACE;
	171	if (connector->doublescan_allowed)
	172	mode_flags \|= DRM_MODE_FLAG_DBLSCAN;
	173	if (connector->stereo_allowed)
	174	mode_flags \|= DRM_MODE_FLAG_3D_MASK;
	175	drm_mode_validate_flag(connector, mode_flags);
	176
	177	list_for_each_entry(mode, &connector->modes, head) {
f9b0e251	178	if (mode->status == MODE_OK && connector_funcs->mode_valid)
8d754544 DV	179	mode->status = connector_funcs->mode_valid(connector,
	180	mode);
	181	}
	182
	183	prune:
	184	drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
	185
	186	if (list_empty(&connector->modes))
	187	return 0;
	188
	189	list_for_each_entry(mode, &connector->modes, head)
	190	mode->vrefresh = drm_mode_vrefresh(mode);
	191
	192	drm_mode_sort(&connector->modes);
	193
	194	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] probed modes :\n", connector->base.id,
25933820	195	connector->name);
8d754544 DV	196	list_for_each_entry(mode, &connector->modes, head) {
	197	drm_mode_set_crtcinfo(mode, CRTC_INTERLACE_HALVE_V);
	198	drm_mode_debug_printmodeline(mode);
	199	}
	200
	201	return count;
	202	}
b87577b7 DA	203
	204	/**
	205	* drm_helper_probe_single_connector_modes - get complete set of display modes
	206	* @connector: connector to probe
	207	* @maxX: max width for modes
	208	* @maxY: max height for modes
	209	*
	210	* Based on the helper callbacks implemented by @connector try to detect all
	211	* valid modes. Modes will first be added to the connector's probed_modes list,
	212	* then culled (based on validity and the @maxX, @maxY parameters) and put into
	213	* the normal modes list.
	214	*
	215	* Intended to be use as a generic implementation of the ->fill_modes()
	216	* @connector vfunc for drivers that use the crtc helpers for output mode
	217	* filtering and detection.
	218	*
	219	* Returns:
	220	* The number of modes found on @connector.
	221	*/
	222	int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
	223	uint32_t maxX, uint32_t maxY)
	224	{
	225	return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, true);
	226	}
8d754544 DV	227	EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
8d754544 DV	228
b87577b7 DA	229	/**
	230	* drm_helper_probe_single_connector_modes_nomerge - get complete set of display modes
	231	* @connector: connector to probe
	232	* @maxX: max width for modes
	233	* @maxY: max height for modes
	234	*
	235	* This operates like drm_hehlper_probe_single_connector_modes except it
	236	* replaces the mode bits instead of merging them for preferred modes.
	237	*/
	238	int drm_helper_probe_single_connector_modes_nomerge(struct drm_connector *connector,
	239	uint32_t maxX, uint32_t maxY)
	240	{
	241	return drm_helper_probe_single_connector_modes_merge_bits(connector, maxX, maxY, false);
	242	}
	243	EXPORT_SYMBOL(drm_helper_probe_single_connector_modes_nomerge);
	244
8d754544 DV	245	/**
	246	* drm_kms_helper_hotplug_event - fire off KMS hotplug events
	247	* @dev: drm_device whose connector state changed
	248	*
	249	* This function fires off the uevent for userspace and also calls the
	250	* output_poll_changed function, which is most commonly used to inform the fbdev
	251	* emulation code and allow it to update the fbcon output configuration.
	252	*
	253	* Drivers should call this from their hotplug handling code when a change is
	254	* detected. Note that this function does not do any output detection of its
	255	* own, like drm_helper_hpd_irq_event() does - this is assumed to be done by the
	256	* driver already.
	257	*
	258	* This function must be called from process context with no mode
	259	* setting locks held.
	260	*/
	261	void drm_kms_helper_hotplug_event(struct drm_device *dev)
	262	{
	263	/* send a uevent + call fbdev */
	264	drm_sysfs_hotplug_event(dev);
	265	if (dev->mode_config.funcs->output_poll_changed)
	266	dev->mode_config.funcs->output_poll_changed(dev);
	267	}
	268	EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
	269
	270	#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
	271	static void output_poll_execute(struct work_struct *work)
	272	{
	273	struct delayed_work *delayed_work = to_delayed_work(work);
	274	struct drm_device *dev = container_of(delayed_work, struct drm_device, mode_config.output_poll_work);
	275	struct drm_connector *connector;
	276	enum drm_connector_status old_status;
	277	bool repoll = false, changed = false;
	278
	279	if (!drm_kms_helper_poll)
	280	return;
	281
	282	mutex_lock(&dev->mode_config.mutex);
	283	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	284
	285	/* Ignore forced connectors. */
	286	if (connector->force)
	287	continue;
	288
	289	/* Ignore HPD capable connectors and connectors where we don't
	290	* want any hotplug detection at all for polling. */
	291	if (!connector->polled \|\| connector->polled == DRM_CONNECTOR_POLL_HPD)
	292	continue;
	293
	294	repoll = true;
	295
	296	old_status = connector->status;
	297	/* if we are connected and don't want to poll for disconnect
	298	skip it */
	299	if (old_status == connector_status_connected &&
	300	!(connector->polled & DRM_CONNECTOR_POLL_DISCONNECT))
	301	continue;
	302
	303	connector->status = connector->funcs->detect(connector, false);
	304	if (old_status != connector->status) {
	305	const char old, new;
	306
	307	old = drm_get_connector_status_name(old_status);
	308	new = drm_get_connector_status_name(connector->status);
309
310	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] "
311	"status updated from %s to %s\n",
312	connector->base.id,
25933820	313	connector->name,
8d754544 DV	314	old, new);
	315
	316	changed = true;
	317	}
	318	}
	319
	320	mutex_unlock(&dev->mode_config.mutex);
	321
	322	if (changed)
	323	drm_kms_helper_hotplug_event(dev);
	324
	325	if (repoll)
	326	schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
	327	}
	328
	329	/**
	330	* drm_kms_helper_poll_disable - disable output polling
	331	* @dev: drm_device
	332	*
	333	* This function disables the output polling work.
	334	*
	335	* Drivers can call this helper from their device suspend implementation. It is
	336	* not an error to call this even when output polling isn't enabled or arlready
	337	* disabled.
	338	*/
	339	void drm_kms_helper_poll_disable(struct drm_device *dev)
	340	{
	341	if (!dev->mode_config.poll_enabled)
	342	return;
	343	cancel_delayed_work_sync(&dev->mode_config.output_poll_work);
	344	}
	345	EXPORT_SYMBOL(drm_kms_helper_poll_disable);
	346
	347	/**
	348	* drm_kms_helper_poll_enable - re-enable output polling.
	349	* @dev: drm_device
	350	*
	351	* This function re-enables the output polling work.
	352	*
	353	* Drivers can call this helper from their device resume implementation. It is
	354	* an error to call this when the output polling support has not yet been set
	355	* up.
	356	*/
	357	void drm_kms_helper_poll_enable(struct drm_device *dev)
	358	{
	359	bool poll = false;
	360	struct drm_connector *connector;
	361
	362	if (!dev->mode_config.poll_enabled \|\| !drm_kms_helper_poll)
	363	return;
	364
	365	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
	366	if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT \|
	367	DRM_CONNECTOR_POLL_DISCONNECT))
	368	poll = true;
	369	}
	370
	371	if (poll)
	372	schedule_delayed_work(&dev->mode_config.output_poll_work, DRM_OUTPUT_POLL_PERIOD);
	373	}
	374	EXPORT_SYMBOL(drm_kms_helper_poll_enable);
	375
	376	/**
	377	* drm_kms_helper_poll_init - initialize and enable output polling
378	* @dev: drm_device
379	*
380	* This function intializes and then also enables output polling support for
381	* @dev. Drivers which do not have reliable hotplug support in hardware can use
382	* this helper infrastructure to regularly poll such connectors for changes in
383	* their connection state.
384	*
385	* Drivers can control which connectors are polled by setting the
386	* DRM_CONNECTOR_POLL_CONNECT and DRM_CONNECTOR_POLL_DISCONNECT flags. On
387	* connectors where probing live outputs can result in visual distortion drivers
388	* should not set the DRM_CONNECTOR_POLL_DISCONNECT flag to avoid this.
389	* Connectors which have no flag or only DRM_CONNECTOR_POLL_HPD set are
390	* completely ignored by the polling logic.
391	*
392	* Note that a connector can be both polled and probed from the hotplug handler,
393	* in case the hotplug interrupt is known to be unreliable.
394	*/
395	void drm_kms_helper_poll_init(struct drm_device *dev)
396	{
397	INIT_DELAYED_WORK(&dev->mode_config.output_poll_work, output_poll_execute);
398	dev->mode_config.poll_enabled = true;
399
400	drm_kms_helper_poll_enable(dev);
401	}
402	EXPORT_SYMBOL(drm_kms_helper_poll_init);
403
404	/**
405	* drm_kms_helper_poll_fini - disable output polling and clean it up
406	* @dev: drm_device
407	*/
408	void drm_kms_helper_poll_fini(struct drm_device *dev)
409	{
410	drm_kms_helper_poll_disable(dev);
411	}
412	EXPORT_SYMBOL(drm_kms_helper_poll_fini);
413
414	/**
415	* drm_helper_hpd_irq_event - hotplug processing
416	* @dev: drm_device
417	*
418	* Drivers can use this helper function to run a detect cycle on all connectors
419	* which have the DRM_CONNECTOR_POLL_HPD flag set in their &polled member. All
420	* other connectors are ignored, which is useful to avoid reprobing fixed
421	* panels.
422	*
423	* This helper function is useful for drivers which can't or don't track hotplug
424	* interrupts for each connector.
425	*
426	* Drivers which support hotplug interrupts for each connector individually and
427	* which have a more fine-grained detect logic should bypass this code and
428	* directly call drm_kms_helper_hotplug_event() in case the connector state
429	* changed.
430	*
431	* This function must be called from process context with no mode
432	* setting locks held.
433	*
434	* Note that a connector can be both polled and probed from the hotplug handler,
435	* in case the hotplug interrupt is known to be unreliable.
436	*/
437	bool drm_helper_hpd_irq_event(struct drm_device *dev)
438	{
439	struct drm_connector *connector;
440	enum drm_connector_status old_status;
441	bool changed = false;
442
443	if (!dev->mode_config.poll_enabled)
444	return false;
445
446	mutex_lock(&dev->mode_config.mutex);
447	list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
448
449	/* Only handle HPD capable connectors. */
450	if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
451	continue;
452
453	old_status = connector->status;
454
455	connector->status = connector->funcs->detect(connector, false);
456	DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
457	connector->base.id,
25933820	458	connector->name,
8d754544 DV	459	drm_get_connector_status_name(old_status),
	460	drm_get_connector_status_name(connector->status));
	461	if (old_status != connector->status)
	462	changed = true;
	463	}
	464
	465	mutex_unlock(&dev->mode_config.mutex);
	466
	467	if (changed)
	468	drm_kms_helper_hotplug_event(dev);
	469
	470	return changed;
	471	}
	472	EXPORT_SYMBOL(drm_helper_hpd_irq_event);