795 строки
25 KiB
C
795 строки
25 KiB
C
/*
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* Copyright (c) 2006-2008 Intel Corporation
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* Copyright (c) 2007 Dave Airlie <airlied@linux.ie>
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*
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* DRM core CRTC related functions
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*
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* Permission to use, copy, modify, distribute, and sell this software and its
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* documentation for any purpose is hereby granted without fee, provided that
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* the above copyright notice appear in all copies and that both that copyright
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* notice and this permission notice appear in supporting documentation, and
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* that the name of the copyright holders not be used in advertising or
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* publicity pertaining to distribution of the software without specific,
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* written prior permission. The copyright holders make no representations
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* about the suitability of this software for any purpose. It is provided "as
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* is" without express or implied warranty.
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*
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* THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
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* INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
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* EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
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* CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
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* DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
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* TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
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* OF THIS SOFTWARE.
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*
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* Authors:
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* Keith Packard
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* Eric Anholt <eric@anholt.net>
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* Dave Airlie <airlied@linux.ie>
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* Jesse Barnes <jesse.barnes@intel.com>
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*/
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#include <linux/export.h>
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#include <linux/moduleparam.h>
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#include <drm/drmP.h>
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#include <drm/drm_client.h>
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#include <drm/drm_crtc.h>
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#include <drm/drm_fourcc.h>
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#include <drm/drm_fb_helper.h>
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#include <drm/drm_edid.h>
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#include <drm/drm_modeset_helper_vtables.h>
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#include <drm/drm_probe_helper.h>
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#include "drm_crtc_helper_internal.h"
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/**
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* DOC: output probing helper overview
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*
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* This library provides some helper code for output probing. It provides an
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* implementation of the core &drm_connector_funcs.fill_modes interface with
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* drm_helper_probe_single_connector_modes().
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*
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* It also provides support for polling connectors with a work item and for
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* generic hotplug interrupt handling where the driver doesn't or cannot keep
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* track of a per-connector hpd interrupt.
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*
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* This helper library can be used independently of the modeset helper library.
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* Drivers can also overwrite different parts e.g. use their own hotplug
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* handling code to avoid probing unrelated outputs.
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*
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* The probe helpers share the function table structures with other display
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* helper libraries. See &struct drm_connector_helper_funcs for the details.
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*/
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static bool drm_kms_helper_poll = true;
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module_param_named(poll, drm_kms_helper_poll, bool, 0600);
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static enum drm_mode_status
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drm_mode_validate_flag(const struct drm_display_mode *mode,
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int flags)
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{
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if ((mode->flags & DRM_MODE_FLAG_INTERLACE) &&
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!(flags & DRM_MODE_FLAG_INTERLACE))
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return MODE_NO_INTERLACE;
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if ((mode->flags & DRM_MODE_FLAG_DBLSCAN) &&
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!(flags & DRM_MODE_FLAG_DBLSCAN))
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return MODE_NO_DBLESCAN;
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if ((mode->flags & DRM_MODE_FLAG_3D_MASK) &&
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!(flags & DRM_MODE_FLAG_3D_MASK))
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return MODE_NO_STEREO;
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return MODE_OK;
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}
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static enum drm_mode_status
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drm_mode_validate_pipeline(struct drm_display_mode *mode,
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struct drm_connector *connector)
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{
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struct drm_device *dev = connector->dev;
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enum drm_mode_status ret = MODE_OK;
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struct drm_encoder *encoder;
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int i;
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/* Step 1: Validate against connector */
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ret = drm_connector_mode_valid(connector, mode);
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if (ret != MODE_OK)
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return ret;
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/* Step 2: Validate against encoders and crtcs */
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drm_connector_for_each_possible_encoder(connector, encoder, i) {
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struct drm_crtc *crtc;
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ret = drm_encoder_mode_valid(encoder, mode);
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if (ret != MODE_OK) {
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/* No point in continuing for crtc check as this encoder
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* will not accept the mode anyway. If all encoders
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* reject the mode then, at exit, ret will not be
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* MODE_OK. */
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continue;
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}
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ret = drm_bridge_mode_valid(encoder->bridge, mode);
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if (ret != MODE_OK) {
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/* There is also no point in continuing for crtc check
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* here. */
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continue;
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}
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drm_for_each_crtc(crtc, dev) {
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if (!drm_encoder_crtc_ok(encoder, crtc))
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continue;
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ret = drm_crtc_mode_valid(crtc, mode);
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if (ret == MODE_OK) {
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/* If we get to this point there is at least
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* one combination of encoder+crtc that works
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* for this mode. Lets return now. */
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return ret;
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}
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}
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}
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return ret;
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}
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static int drm_helper_probe_add_cmdline_mode(struct drm_connector *connector)
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{
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struct drm_cmdline_mode *cmdline_mode;
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struct drm_display_mode *mode;
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cmdline_mode = &connector->cmdline_mode;
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if (!cmdline_mode->specified)
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return 0;
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/* Only add a GTF mode if we find no matching probed modes */
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list_for_each_entry(mode, &connector->probed_modes, head) {
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if (mode->hdisplay != cmdline_mode->xres ||
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mode->vdisplay != cmdline_mode->yres)
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continue;
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if (cmdline_mode->refresh_specified) {
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/* The probed mode's vrefresh is set until later */
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if (drm_mode_vrefresh(mode) != cmdline_mode->refresh)
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continue;
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}
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return 0;
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}
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mode = drm_mode_create_from_cmdline_mode(connector->dev,
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cmdline_mode);
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if (mode == NULL)
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return 0;
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drm_mode_probed_add(connector, mode);
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return 1;
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}
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enum drm_mode_status drm_crtc_mode_valid(struct drm_crtc *crtc,
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const struct drm_display_mode *mode)
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{
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const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
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if (!crtc_funcs || !crtc_funcs->mode_valid)
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return MODE_OK;
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return crtc_funcs->mode_valid(crtc, mode);
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}
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enum drm_mode_status drm_encoder_mode_valid(struct drm_encoder *encoder,
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const struct drm_display_mode *mode)
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{
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const struct drm_encoder_helper_funcs *encoder_funcs =
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encoder->helper_private;
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if (!encoder_funcs || !encoder_funcs->mode_valid)
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return MODE_OK;
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return encoder_funcs->mode_valid(encoder, mode);
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}
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enum drm_mode_status drm_connector_mode_valid(struct drm_connector *connector,
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struct drm_display_mode *mode)
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{
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const struct drm_connector_helper_funcs *connector_funcs =
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connector->helper_private;
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if (!connector_funcs || !connector_funcs->mode_valid)
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return MODE_OK;
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return connector_funcs->mode_valid(connector, mode);
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}
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#define DRM_OUTPUT_POLL_PERIOD (10*HZ)
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/**
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* drm_kms_helper_poll_enable - re-enable output polling.
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* @dev: drm_device
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*
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* This function re-enables the output polling work, after it has been
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* temporarily disabled using drm_kms_helper_poll_disable(), for example over
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* suspend/resume.
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*
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* Drivers can call this helper from their device resume implementation. It is
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* not an error to call this even when output polling isn't enabled.
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*
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* Note that calls to enable and disable polling must be strictly ordered, which
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* is automatically the case when they're only call from suspend/resume
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* callbacks.
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*/
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void drm_kms_helper_poll_enable(struct drm_device *dev)
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{
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bool poll = false;
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struct drm_connector *connector;
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struct drm_connector_list_iter conn_iter;
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unsigned long delay = DRM_OUTPUT_POLL_PERIOD;
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if (!dev->mode_config.poll_enabled || !drm_kms_helper_poll)
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return;
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drm_connector_list_iter_begin(dev, &conn_iter);
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drm_for_each_connector_iter(connector, &conn_iter) {
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if (connector->polled & (DRM_CONNECTOR_POLL_CONNECT |
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DRM_CONNECTOR_POLL_DISCONNECT))
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poll = true;
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}
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drm_connector_list_iter_end(&conn_iter);
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if (dev->mode_config.delayed_event) {
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/*
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* FIXME:
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*
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* Use short (1s) delay to handle the initial delayed event.
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* This delay should not be needed, but Optimus/nouveau will
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* fail in a mysterious way if the delayed event is handled as
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* soon as possible like it is done in
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* drm_helper_probe_single_connector_modes() in case the poll
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* was enabled before.
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*/
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poll = true;
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delay = HZ;
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}
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if (poll)
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schedule_delayed_work(&dev->mode_config.output_poll_work, delay);
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}
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EXPORT_SYMBOL(drm_kms_helper_poll_enable);
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static enum drm_connector_status
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drm_helper_probe_detect_ctx(struct drm_connector *connector, bool force)
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{
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const struct drm_connector_helper_funcs *funcs = connector->helper_private;
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struct drm_modeset_acquire_ctx ctx;
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int ret;
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drm_modeset_acquire_init(&ctx, 0);
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retry:
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ret = drm_modeset_lock(&connector->dev->mode_config.connection_mutex, &ctx);
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if (!ret) {
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if (funcs->detect_ctx)
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ret = funcs->detect_ctx(connector, &ctx, force);
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else if (connector->funcs->detect)
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ret = connector->funcs->detect(connector, force);
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else
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ret = connector_status_connected;
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}
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if (ret == -EDEADLK) {
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drm_modeset_backoff(&ctx);
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goto retry;
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}
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if (WARN_ON(ret < 0))
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ret = connector_status_unknown;
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drm_modeset_drop_locks(&ctx);
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drm_modeset_acquire_fini(&ctx);
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return ret;
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}
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/**
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* drm_helper_probe_detect - probe connector status
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* @connector: connector to probe
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* @ctx: acquire_ctx, or NULL to let this function handle locking.
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* @force: Whether destructive probe operations should be performed.
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*
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* This function calls the detect callbacks of the connector.
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* This function returns &drm_connector_status, or
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* if @ctx is set, it might also return -EDEADLK.
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*/
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int
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drm_helper_probe_detect(struct drm_connector *connector,
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struct drm_modeset_acquire_ctx *ctx,
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bool force)
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{
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const struct drm_connector_helper_funcs *funcs = connector->helper_private;
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struct drm_device *dev = connector->dev;
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int ret;
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if (!ctx)
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return drm_helper_probe_detect_ctx(connector, force);
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ret = drm_modeset_lock(&dev->mode_config.connection_mutex, ctx);
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if (ret)
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return ret;
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if (funcs->detect_ctx)
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return funcs->detect_ctx(connector, ctx, force);
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else if (connector->funcs->detect)
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return connector->funcs->detect(connector, force);
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else
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return connector_status_connected;
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}
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EXPORT_SYMBOL(drm_helper_probe_detect);
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/**
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* drm_helper_probe_single_connector_modes - get complete set of display modes
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* @connector: connector to probe
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* @maxX: max width for modes
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* @maxY: max height for modes
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*
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* Based on the helper callbacks implemented by @connector in struct
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* &drm_connector_helper_funcs try to detect all valid modes. Modes will first
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* be added to the connector's probed_modes list, then culled (based on validity
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* and the @maxX, @maxY parameters) and put into the normal modes list.
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*
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* Intended to be used as a generic implementation of the
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* &drm_connector_funcs.fill_modes() vfunc for drivers that use the CRTC helpers
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* for output mode filtering and detection.
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*
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* The basic procedure is as follows
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*
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* 1. All modes currently on the connector's modes list are marked as stale
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*
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* 2. New modes are added to the connector's probed_modes list with
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* drm_mode_probed_add(). New modes start their life with status as OK.
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* Modes are added from a single source using the following priority order.
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*
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* - &drm_connector_helper_funcs.get_modes vfunc
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* - if the connector status is connector_status_connected, standard
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* VESA DMT modes up to 1024x768 are automatically added
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* (drm_add_modes_noedid())
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*
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* Finally modes specified via the kernel command line (video=...) are
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* added in addition to what the earlier probes produced
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* (drm_helper_probe_add_cmdline_mode()). These modes are generated
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* using the VESA GTF/CVT formulas.
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*
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* 3. Modes are moved from the probed_modes list to the modes list. Potential
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* duplicates are merged together (see drm_connector_list_update()).
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* After this step the probed_modes list will be empty again.
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*
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* 4. Any non-stale mode on the modes list then undergoes validation
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*
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* - drm_mode_validate_basic() performs basic sanity checks
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* - drm_mode_validate_size() filters out modes larger than @maxX and @maxY
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* (if specified)
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* - drm_mode_validate_flag() checks the modes against basic connector
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* capabilities (interlace_allowed,doublescan_allowed,stereo_allowed)
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* - the optional &drm_connector_helper_funcs.mode_valid helper can perform
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* driver and/or sink specific checks
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* - the optional &drm_crtc_helper_funcs.mode_valid,
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* &drm_bridge_funcs.mode_valid and &drm_encoder_helper_funcs.mode_valid
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* helpers can perform driver and/or source specific checks which are also
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* enforced by the modeset/atomic helpers
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*
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* 5. Any mode whose status is not OK is pruned from the connector's modes list,
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* accompanied by a debug message indicating the reason for the mode's
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* rejection (see drm_mode_prune_invalid()).
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*
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* Returns:
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* The number of modes found on @connector.
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*/
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int drm_helper_probe_single_connector_modes(struct drm_connector *connector,
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uint32_t maxX, uint32_t maxY)
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{
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struct drm_device *dev = connector->dev;
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struct drm_display_mode *mode;
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const struct drm_connector_helper_funcs *connector_funcs =
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connector->helper_private;
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int count = 0, ret;
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int mode_flags = 0;
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bool verbose_prune = true;
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enum drm_connector_status old_status;
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struct drm_modeset_acquire_ctx ctx;
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WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
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drm_modeset_acquire_init(&ctx, 0);
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s]\n", connector->base.id,
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connector->name);
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retry:
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ret = drm_modeset_lock(&dev->mode_config.connection_mutex, &ctx);
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if (ret == -EDEADLK) {
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drm_modeset_backoff(&ctx);
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goto retry;
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} else
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WARN_ON(ret < 0);
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/* set all old modes to the stale state */
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list_for_each_entry(mode, &connector->modes, head)
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mode->status = MODE_STALE;
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old_status = connector->status;
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if (connector->force) {
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if (connector->force == DRM_FORCE_ON ||
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connector->force == DRM_FORCE_ON_DIGITAL)
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connector->status = connector_status_connected;
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else
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connector->status = connector_status_disconnected;
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if (connector->funcs->force)
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connector->funcs->force(connector);
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} else {
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ret = drm_helper_probe_detect(connector, &ctx, true);
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if (ret == -EDEADLK) {
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drm_modeset_backoff(&ctx);
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goto retry;
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} else if (WARN(ret < 0, "Invalid return value %i for connector detection\n", ret))
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ret = connector_status_unknown;
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connector->status = ret;
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}
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/*
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* Normally either the driver's hpd code or the poll loop should
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* pick up any changes and fire the hotplug event. But if
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* userspace sneaks in a probe, we might miss a change. Hence
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* check here, and if anything changed start the hotplug code.
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*/
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if (old_status != connector->status) {
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] status updated from %s to %s\n",
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connector->base.id,
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connector->name,
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drm_get_connector_status_name(old_status),
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drm_get_connector_status_name(connector->status));
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/*
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* The hotplug event code might call into the fb
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* helpers, and so expects that we do not hold any
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* locks. Fire up the poll struct instead, it will
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* disable itself again.
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*/
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dev->mode_config.delayed_event = true;
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if (dev->mode_config.poll_enabled)
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schedule_delayed_work(&dev->mode_config.output_poll_work,
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0);
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}
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/* Re-enable polling in case the global poll config changed. */
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if (drm_kms_helper_poll != dev->mode_config.poll_running)
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drm_kms_helper_poll_enable(dev);
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dev->mode_config.poll_running = drm_kms_helper_poll;
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if (connector->status == connector_status_disconnected) {
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DRM_DEBUG_KMS("[CONNECTOR:%d:%s] disconnected\n",
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connector->base.id, connector->name);
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drm_connector_update_edid_property(connector, NULL);
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verbose_prune = false;
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goto prune;
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}
|
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count = (*connector_funcs->get_modes)(connector);
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if (count == 0 && connector->status == connector_status_connected)
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count = drm_add_modes_noedid(connector, 1024, 768);
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count += drm_helper_probe_add_cmdline_mode(connector);
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if (count == 0)
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goto prune;
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drm_connector_list_update(connector);
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|
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if (connector->interlace_allowed)
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mode_flags |= DRM_MODE_FLAG_INTERLACE;
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if (connector->doublescan_allowed)
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mode_flags |= DRM_MODE_FLAG_DBLSCAN;
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if (connector->stereo_allowed)
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mode_flags |= DRM_MODE_FLAG_3D_MASK;
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list_for_each_entry(mode, &connector->modes, head) {
|
|
if (mode->status == MODE_OK)
|
|
mode->status = drm_mode_validate_driver(dev, 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)
|
|
mode->status = drm_mode_validate_pipeline(mode,
|
|
connector);
|
|
|
|
if (mode->status == MODE_OK)
|
|
mode->status = drm_mode_validate_ycbcr420(mode,
|
|
connector);
|
|
}
|
|
|
|
prune:
|
|
drm_mode_prune_invalid(dev, &connector->modes, verbose_prune);
|
|
|
|
drm_modeset_drop_locks(&ctx);
|
|
drm_modeset_acquire_fini(&ctx);
|
|
|
|
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;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_probe_single_connector_modes);
|
|
|
|
/**
|
|
* 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);
|
|
|
|
drm_client_dev_hotplug(dev);
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_hotplug_event);
|
|
|
|
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;
|
|
struct drm_connector_list_iter conn_iter;
|
|
enum drm_connector_status old_status;
|
|
bool repoll = false, changed;
|
|
|
|
/* Pick up any changes detected by the probe functions. */
|
|
changed = dev->mode_config.delayed_event;
|
|
dev->mode_config.delayed_event = false;
|
|
|
|
if (!drm_kms_helper_poll)
|
|
goto out;
|
|
|
|
if (!mutex_trylock(&dev->mode_config.mutex)) {
|
|
repoll = true;
|
|
goto out;
|
|
}
|
|
|
|
drm_connector_list_iter_begin(dev, &conn_iter);
|
|
drm_for_each_connector_iter(connector, &conn_iter) {
|
|
/* 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;
|
|
|
|
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;
|
|
|
|
repoll = true;
|
|
|
|
connector->status = drm_helper_probe_detect(connector, NULL, false);
|
|
if (old_status != connector->status) {
|
|
const char *old, *new;
|
|
|
|
/*
|
|
* The poll work sets force=false when calling detect so
|
|
* that drivers can avoid to do disruptive tests (e.g.
|
|
* when load detect cycles could cause flickering on
|
|
* other, running displays). This bears the risk that we
|
|
* flip-flop between unknown here in the poll work and
|
|
* the real state when userspace forces a full detect
|
|
* call after receiving a hotplug event due to this
|
|
* change.
|
|
*
|
|
* Hence clamp an unknown detect status to the old
|
|
* value.
|
|
*/
|
|
if (connector->status == connector_status_unknown) {
|
|
connector->status = old_status;
|
|
continue;
|
|
}
|
|
|
|
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;
|
|
}
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
out:
|
|
if (changed)
|
|
drm_kms_helper_hotplug_event(dev);
|
|
|
|
if (repoll)
|
|
schedule_delayed_work(delayed_work, DRM_OUTPUT_POLL_PERIOD);
|
|
}
|
|
|
|
/**
|
|
* drm_kms_helper_is_poll_worker - is %current task an output poll worker?
|
|
*
|
|
* Determine if %current task is an output poll worker. This can be used
|
|
* to select distinct code paths for output polling versus other contexts.
|
|
*
|
|
* One use case is to avoid a deadlock between the output poll worker and
|
|
* the autosuspend worker wherein the latter waits for polling to finish
|
|
* upon calling drm_kms_helper_poll_disable(), while the former waits for
|
|
* runtime suspend to finish upon calling pm_runtime_get_sync() in a
|
|
* connector ->detect hook.
|
|
*/
|
|
bool drm_kms_helper_is_poll_worker(void)
|
|
{
|
|
struct work_struct *work = current_work();
|
|
|
|
return work && work->func == output_poll_execute;
|
|
}
|
|
EXPORT_SYMBOL(drm_kms_helper_is_poll_worker);
|
|
|
|
/**
|
|
* 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 already
|
|
* disabled. Polling is re-enabled by calling drm_kms_helper_poll_enable().
|
|
*
|
|
* Note that calls to enable and disable polling must be strictly ordered, which
|
|
* is automatically the case when they're only call from suspend/resume
|
|
* callbacks.
|
|
*/
|
|
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_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;
|
|
struct drm_connector_list_iter conn_iter;
|
|
enum drm_connector_status old_status;
|
|
bool changed = false;
|
|
|
|
if (!dev->mode_config.poll_enabled)
|
|
return false;
|
|
|
|
mutex_lock(&dev->mode_config.mutex);
|
|
drm_connector_list_iter_begin(dev, &conn_iter);
|
|
drm_for_each_connector_iter(connector, &conn_iter) {
|
|
/* Only handle HPD capable connectors. */
|
|
if (!(connector->polled & DRM_CONNECTOR_POLL_HPD))
|
|
continue;
|
|
|
|
old_status = connector->status;
|
|
|
|
connector->status = drm_helper_probe_detect(connector, NULL, 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;
|
|
}
|
|
drm_connector_list_iter_end(&conn_iter);
|
|
mutex_unlock(&dev->mode_config.mutex);
|
|
|
|
if (changed)
|
|
drm_kms_helper_hotplug_event(dev);
|
|
|
|
return changed;
|
|
}
|
|
EXPORT_SYMBOL(drm_helper_hpd_irq_event);
|