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/*
* 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.
*
* The probe helpers share the function table structures with other display
* helper libraries. See struct &drm_connector_helper_funcs for the details.
*/
static bool drm_kms_helper_poll = true;
module_param_named(poll, drm_kms_helper_poll, bool, 0600);
static enum drm_mode_status
drm_mode_validate_flag(const struct drm_display_mode *mode,
int flags)
{
if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
!(flags & DRM_MODE_FLAG_INTERLACE))
return MODE_NO_INTERLACE;
if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
!(flags & DRM_MODE_FLAG_DBLSCAN))
return MODE_NO_DBLESCAN;
if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
!(flags & DRM_MODE_FLAG_3D_MASK))
return MODE_NO_STEREO;
return MODE_OK;
}
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;
}
#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
/**
* drm_kms_helper_poll_enable_locked - re-enable output polling.
* @dev: drm_device
*
* This function re-enables the output polling work without
* locking the mode_config mutex.
*
* This is like drm_kms_helper_poll_enable() however it is to be
* called from a context where the mode_config mutex is locked
* already.
*/
void drm_kms_helper_poll_enable_locked(struct drm_device *dev)
{
bool poll = false;
struct drm_connector *connector;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
return;
drm_for_each_connector(connector, dev) {
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_locked);
/**
* 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 in struct
* &drm_connector_helper_funcs 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 used as a generic implementation of the ->fill_modes()
* @connector vfunc for drivers that use the CRTC helpers for output mode
* filtering and detection.
*
* If the helper operation returns no mode, and if the connector status is
* connector_status_connected, standard VESA DMT modes up to 1024x768 are
* automatically added to the modes list by a call to
* drm_add_modes_noedid().
*
* The function then filters out modes larger than @maxX and maxY if specified.
* It finally calls the optional connector ->mode_valid() helper operation for each
* mode in the probed list to check whether the mode is valid for the connector.
*
* Compared to drm_helper_probe_single_connector_modes_nomerge() this function
* merged the mode bits for the preferred mode, as a hack to work around some
* quirky issues on funky hardware.
*
* 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)
{
struct drm_device *dev = connector->dev;
struct drm_display_mode *mode;
const struct drm_connector_helper_funcs *connector_funcs =
connector->helper_private;
int count = 0;
int mode_flags = 0;
bool verbose_prune = true;
enum drm_connector_status old_status;
WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
connector->name);
/* set all old modes to the stale state */
list_for_each_entry(mode, &connector->modes, head)
mode->status = MODE_STALE;
old_status = connector->status;
if (connector->force) {
if (connector->force == DRM_FORCE_ON ||
connector->force == DRM_FORCE_ON_DIGITAL)
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);
}
/*
* Normally either the driver's hpd code or the poll loop should
* pick up any changes and fire the hotplug event. But if
* userspace sneaks in a probe, we might miss a change. Hence
* check here, and if anything changed start the hotplug code.
*/
if (old_status != connector->status) {
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));
/*
* The hotplug event code might call into the fb
* helpers, and so expects that we do not hold any
* locks. Fire up the poll struct instead, it will
* disable itself again.
*/
dev->mode_config.delayed_event = true;
if (dev->mode_config.poll_enabled)
schedule_delayed_work(&dev->mode_config.output_poll_work,
0);
}
/* 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_locked(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);
drm_edid_to_eld(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);
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;
list_for_each_entry(mode, &connector->modes, head) {
if (mode->status == MODE_OK)
mode->status = drm_mode_validate_basic(mode);
if (mode->status == MODE_OK)
mode->status = drm_mode_validate_size(mode, maxX, maxY);
if (mode->status == MODE_OK)
mode->status = drm_mode_validate_flag(mode, mode_flags);
if (mode->status == MODE_OK && connector_funcs->mode_valid)
mode->status = connector_funcs->mode_valid(connector,
mode);
}
prune:
drm_mode_prune_invalid(dev
|