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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/kernel.h>
- #include <linux/moduleparam.h>
- #include <drm/drm_atomic.h>
- #include <drm/drm_atomic_helper.h>
- #include <drm/drm_atomic_uapi.h>
- #include <drm/drm_bridge.h>
- #include <drm/drm_crtc.h>
- #include <drm/drm_crtc_helper.h>
- #include <drm/drm_drv.h>
- #include <drm/drm_edid.h>
- #include <drm/drm_encoder.h>
- #include <drm/drm_fb_helper.h>
- #include <drm/drm_fourcc.h>
- #include <drm/drm_plane_helper.h>
- #include <drm/drm_print.h>
- #include <drm/drm_vblank.h>
- #include "drm_crtc_helper_internal.h"
- /**
- * DOC: overview
- *
- * The CRTC modeset helper library provides a default set_config implementation
- * in drm_crtc_helper_set_config(). Plus a few other convenience functions using
- * the same callbacks which drivers can use to e.g. restore the modeset
- * configuration on resume with drm_helper_resume_force_mode().
- *
- * Note that this helper library doesn't track the current power state of CRTCs
- * and encoders. It can call callbacks like &drm_encoder_helper_funcs.dpms even
- * though the hardware is already in the desired state. This deficiency has been
- * fixed in the atomic helpers.
- *
- * The driver callbacks are mostly compatible with the atomic modeset helpers,
- * except for the handling of the primary plane: Atomic helpers require that the
- * primary plane is implemented as a real standalone plane and not directly tied
- * to the CRTC state. For easier transition this library provides functions to
- * implement the old semantics required by the CRTC helpers using the new plane
- * and atomic helper callbacks.
- *
- * Drivers are strongly urged to convert to the atomic helpers (by way of first
- * converting to the plane helpers). New drivers must not use these functions
- * but need to implement the atomic interface instead, potentially using the
- * atomic helpers for that.
- *
- * These legacy modeset helpers use the same function table structures as
- * all other modesetting helpers. See the documentation for struct
- * &drm_crtc_helper_funcs, &struct drm_encoder_helper_funcs and struct
- * &drm_connector_helper_funcs.
- */
- /**
- * drm_helper_encoder_in_use - check if a given encoder is in use
- * @encoder: encoder to check
- *
- * Checks whether @encoder is with the current mode setting output configuration
- * in use by any connector. This doesn't mean that it is actually enabled since
- * the DPMS state is tracked separately.
- *
- * Returns:
- * True if @encoder is used, false otherwise.
- */
- bool drm_helper_encoder_in_use(struct drm_encoder *encoder)
- {
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- struct drm_device *dev = encoder->dev;
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- /*
- * We can expect this mutex to be locked if we are not panicking.
- * Locking is currently fubar in the panic handler.
- */
- if (!oops_in_progress) {
- WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
- WARN_ON(!drm_modeset_is_locked(&dev->mode_config.connection_mutex));
- }
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
- if (connector->encoder == encoder) {
- drm_connector_list_iter_end(&conn_iter);
- return true;
- }
- }
- drm_connector_list_iter_end(&conn_iter);
- return false;
- }
- EXPORT_SYMBOL(drm_helper_encoder_in_use);
- /**
- * drm_helper_crtc_in_use - check if a given CRTC is in a mode_config
- * @crtc: CRTC to check
- *
- * Checks whether @crtc is with the current mode setting output configuration
- * in use by any connector. This doesn't mean that it is actually enabled since
- * the DPMS state is tracked separately.
- *
- * Returns:
- * True if @crtc is used, false otherwise.
- */
- bool drm_helper_crtc_in_use(struct drm_crtc *crtc)
- {
- struct drm_encoder *encoder;
- struct drm_device *dev = crtc->dev;
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- /*
- * We can expect this mutex to be locked if we are not panicking.
- * Locking is currently fubar in the panic handler.
- */
- if (!oops_in_progress)
- WARN_ON(!mutex_is_locked(&dev->mode_config.mutex));
- drm_for_each_encoder(encoder, dev)
- if (encoder->crtc == crtc && drm_helper_encoder_in_use(encoder))
- return true;
- return false;
- }
- EXPORT_SYMBOL(drm_helper_crtc_in_use);
- static void
- drm_encoder_disable(struct drm_encoder *encoder)
- {
- const struct drm_encoder_helper_funcs *encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- return;
- if (encoder_funcs->disable)
- (*encoder_funcs->disable)(encoder);
- else if (encoder_funcs->dpms)
- (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
- }
- static void __drm_helper_disable_unused_functions(struct drm_device *dev)
- {
- struct drm_encoder *encoder;
- struct drm_crtc *crtc;
- drm_warn_on_modeset_not_all_locked(dev);
- drm_for_each_encoder(encoder, dev) {
- if (!drm_helper_encoder_in_use(encoder)) {
- drm_encoder_disable(encoder);
- /* disconnect encoder from any connector */
- encoder->crtc = NULL;
- }
- }
- drm_for_each_crtc(crtc, dev) {
- const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
- crtc->enabled = drm_helper_crtc_in_use(crtc);
- if (!crtc->enabled) {
- if (crtc_funcs->disable)
- (*crtc_funcs->disable)(crtc);
- else
- (*crtc_funcs->dpms)(crtc, DRM_MODE_DPMS_OFF);
- crtc->primary->fb = NULL;
- }
- }
- }
- /**
- * drm_helper_disable_unused_functions - disable unused objects
- * @dev: DRM device
- *
- * This function walks through the entire mode setting configuration of @dev. It
- * will remove any CRTC links of unused encoders and encoder links of
- * disconnected connectors. Then it will disable all unused encoders and CRTCs
- * either by calling their disable callback if available or by calling their
- * dpms callback with DRM_MODE_DPMS_OFF.
- *
- * NOTE:
- *
- * This function is part of the legacy modeset helper library and will cause
- * major confusion with atomic drivers. This is because atomic helpers guarantee
- * to never call ->disable() hooks on a disabled function, or ->enable() hooks
- * on an enabled functions. drm_helper_disable_unused_functions() on the other
- * hand throws such guarantees into the wind and calls disable hooks
- * unconditionally on unused functions.
- */
- void drm_helper_disable_unused_functions(struct drm_device *dev)
- {
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- drm_modeset_lock_all(dev);
- __drm_helper_disable_unused_functions(dev);
- drm_modeset_unlock_all(dev);
- }
- EXPORT_SYMBOL(drm_helper_disable_unused_functions);
- /*
- * Check the CRTC we're going to map each output to vs. its current
- * CRTC. If they don't match, we have to disable the output and the CRTC
- * since the driver will have to re-route things.
- */
- static void
- drm_crtc_prepare_encoders(struct drm_device *dev)
- {
- const struct drm_encoder_helper_funcs *encoder_funcs;
- struct drm_encoder *encoder;
- drm_for_each_encoder(encoder, dev) {
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- continue;
- /* Disable unused encoders */
- if (encoder->crtc == NULL)
- drm_encoder_disable(encoder);
- }
- }
- /**
- * drm_crtc_helper_set_mode - internal helper to set a mode
- * @crtc: CRTC to program
- * @mode: mode to use
- * @x: horizontal offset into the surface
- * @y: vertical offset into the surface
- * @old_fb: old framebuffer, for cleanup
- *
- * Try to set @mode on @crtc. Give @crtc and its associated connectors a chance
- * to fixup or reject the mode prior to trying to set it. This is an internal
- * helper that drivers could e.g. use to update properties that require the
- * entire output pipe to be disabled and re-enabled in a new configuration. For
- * example for changing whether audio is enabled on a hdmi link or for changing
- * panel fitter or dither attributes. It is also called by the
- * drm_crtc_helper_set_config() helper function to drive the mode setting
- * sequence.
- *
- * Returns:
- * True if the mode was set successfully, false otherwise.
- */
- bool drm_crtc_helper_set_mode(struct drm_crtc *crtc,
- struct drm_display_mode *mode,
- int x, int y,
- struct drm_framebuffer *old_fb)
- {
- struct drm_device *dev = crtc->dev;
- struct drm_display_mode *adjusted_mode, saved_mode, saved_hwmode;
- const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
- const struct drm_encoder_helper_funcs *encoder_funcs;
- int saved_x, saved_y;
- bool saved_enabled;
- struct drm_encoder *encoder;
- bool ret = true;
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- drm_warn_on_modeset_not_all_locked(dev);
- saved_enabled = crtc->enabled;
- crtc->enabled = drm_helper_crtc_in_use(crtc);
- if (!crtc->enabled)
- return true;
- adjusted_mode = drm_mode_duplicate(dev, mode);
- if (!adjusted_mode) {
- crtc->enabled = saved_enabled;
- return false;
- }
- saved_mode = crtc->mode;
- saved_hwmode = crtc->hwmode;
- saved_x = crtc->x;
- saved_y = crtc->y;
- /* Update crtc values up front so the driver can rely on them for mode
- * setting.
- */
- crtc->mode = *mode;
- crtc->x = x;
- crtc->y = y;
- /* Pass our mode to the connectors and the CRTC to give them a chance to
- * adjust it according to limitations or connector properties, and also
- * a chance to reject the mode entirely.
- */
- drm_for_each_encoder(encoder, dev) {
- if (encoder->crtc != crtc)
- continue;
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- continue;
- encoder_funcs = encoder->helper_private;
- if (encoder_funcs->mode_fixup) {
- if (!(ret = encoder_funcs->mode_fixup(encoder, mode,
- adjusted_mode))) {
- DRM_DEBUG_KMS("Encoder fixup failed\n");
- goto done;
- }
- }
- }
- if (crtc_funcs->mode_fixup) {
- if (!(ret = crtc_funcs->mode_fixup(crtc, mode,
- adjusted_mode))) {
- DRM_DEBUG_KMS("CRTC fixup failed\n");
- goto done;
- }
- }
- DRM_DEBUG_KMS("[CRTC:%d:%s]\n", crtc->base.id, crtc->name);
- crtc->hwmode = *adjusted_mode;
- /* Prepare the encoders and CRTCs before setting the mode. */
- drm_for_each_encoder(encoder, dev) {
- if (encoder->crtc != crtc)
- continue;
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- continue;
- /* Disable the encoders as the first thing we do. */
- if (encoder_funcs->prepare)
- encoder_funcs->prepare(encoder);
- }
- drm_crtc_prepare_encoders(dev);
- crtc_funcs->prepare(crtc);
- /* Set up the DPLL and any encoders state that needs to adjust or depend
- * on the DPLL.
- */
- ret = !crtc_funcs->mode_set(crtc, mode, adjusted_mode, x, y, old_fb);
- if (!ret)
- goto done;
- drm_for_each_encoder(encoder, dev) {
- if (encoder->crtc != crtc)
- continue;
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- continue;
- DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%s]\n",
- encoder->base.id, encoder->name, mode->name);
- if (encoder_funcs->mode_set)
- encoder_funcs->mode_set(encoder, mode, adjusted_mode);
- }
- /* Now enable the clocks, plane, pipe, and connectors that we set up. */
- crtc_funcs->commit(crtc);
- drm_for_each_encoder(encoder, dev) {
- if (encoder->crtc != crtc)
- continue;
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- continue;
- if (encoder_funcs->commit)
- encoder_funcs->commit(encoder);
- }
- /* Calculate and store various constants which
- * are later needed by vblank and swap-completion
- * timestamping. They are derived from true hwmode.
- */
- drm_calc_timestamping_constants(crtc, &crtc->hwmode);
- /* FIXME: add subpixel order */
- done:
- drm_mode_destroy(dev, adjusted_mode);
- if (!ret) {
- crtc->enabled = saved_enabled;
- crtc->mode = saved_mode;
- crtc->hwmode = saved_hwmode;
- crtc->x = saved_x;
- crtc->y = saved_y;
- }
- return ret;
- }
- EXPORT_SYMBOL(drm_crtc_helper_set_mode);
- static void
- drm_crtc_helper_disable(struct drm_crtc *crtc)
- {
- struct drm_device *dev = crtc->dev;
- struct drm_connector *connector;
- struct drm_encoder *encoder;
- /* Decouple all encoders and their attached connectors from this crtc */
- drm_for_each_encoder(encoder, dev) {
- struct drm_connector_list_iter conn_iter;
- if (encoder->crtc != crtc)
- continue;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
- if (connector->encoder != encoder)
- continue;
- connector->encoder = NULL;
- /*
- * drm_helper_disable_unused_functions() ought to be
- * doing this, but since we've decoupled the encoder
- * from the connector above, the required connection
- * between them is henceforth no longer available.
- */
- connector->dpms = DRM_MODE_DPMS_OFF;
- /* we keep a reference while the encoder is bound */
- drm_connector_put(connector);
- }
- drm_connector_list_iter_end(&conn_iter);
- }
- __drm_helper_disable_unused_functions(dev);
- }
- /*
- * For connectors that support multiple encoders, either the
- * .atomic_best_encoder() or .best_encoder() operation must be implemented.
- */
- struct drm_encoder *
- drm_connector_get_single_encoder(struct drm_connector *connector)
- {
- struct drm_encoder *encoder;
- WARN_ON(hweight32(connector->possible_encoders) > 1);
- drm_connector_for_each_possible_encoder(connector, encoder)
- return encoder;
- return NULL;
- }
- /**
- * drm_crtc_helper_set_config - set a new config from userspace
- * @set: mode set configuration
- * @ctx: lock acquire context, not used here
- *
- * The drm_crtc_helper_set_config() helper function implements the of
- * &drm_crtc_funcs.set_config callback for drivers using the legacy CRTC
- * helpers.
- *
- * It first tries to locate the best encoder for each connector by calling the
- * connector @drm_connector_helper_funcs.best_encoder helper operation.
- *
- * After locating the appropriate encoders, the helper function will call the
- * mode_fixup encoder and CRTC helper operations to adjust the requested mode,
- * or reject it completely in which case an error will be returned to the
- * application. If the new configuration after mode adjustment is identical to
- * the current configuration the helper function will return without performing
- * any other operation.
- *
- * If the adjusted mode is identical to the current mode but changes to the
- * frame buffer need to be applied, the drm_crtc_helper_set_config() function
- * will call the CRTC &drm_crtc_helper_funcs.mode_set_base helper operation.
- *
- * If the adjusted mode differs from the current mode, or if the
- * ->mode_set_base() helper operation is not provided, the helper function
- * performs a full mode set sequence by calling the ->prepare(), ->mode_set()
- * and ->commit() CRTC and encoder helper operations, in that order.
- * Alternatively it can also use the dpms and disable helper operations. For
- * details see &struct drm_crtc_helper_funcs and struct
- * &drm_encoder_helper_funcs.
- *
- * This function is deprecated. New drivers must implement atomic modeset
- * support, for which this function is unsuitable. Instead drivers should use
- * drm_atomic_helper_set_config().
- *
- * Returns:
- * Returns 0 on success, negative errno numbers on failure.
- */
- int drm_crtc_helper_set_config(struct drm_mode_set *set,
- struct drm_modeset_acquire_ctx *ctx)
- {
- struct drm_device *dev;
- struct drm_crtc **save_encoder_crtcs, *new_crtc;
- struct drm_encoder **save_connector_encoders, *new_encoder, *encoder;
- bool mode_changed = false; /* if true do a full mode set */
- bool fb_changed = false; /* if true and !mode_changed just do a flip */
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- int count = 0, ro, fail = 0;
- const struct drm_crtc_helper_funcs *crtc_funcs;
- struct drm_mode_set save_set;
- int ret;
- int i;
- DRM_DEBUG_KMS("\n");
- BUG_ON(!set);
- BUG_ON(!set->crtc);
- BUG_ON(!set->crtc->helper_private);
- /* Enforce sane interface api - has been abused by the fb helper. */
- BUG_ON(!set->mode && set->fb);
- BUG_ON(set->fb && set->num_connectors == 0);
- crtc_funcs = set->crtc->helper_private;
- dev = set->crtc->dev;
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- if (!set->mode)
- set->fb = NULL;
- if (set->fb) {
- DRM_DEBUG_KMS("[CRTC:%d:%s] [FB:%d] #connectors=%d (x y) (%i %i)\n",
- set->crtc->base.id, set->crtc->name,
- set->fb->base.id,
- (int)set->num_connectors, set->x, set->y);
- } else {
- DRM_DEBUG_KMS("[CRTC:%d:%s] [NOFB]\n",
- set->crtc->base.id, set->crtc->name);
- drm_crtc_helper_disable(set->crtc);
- return 0;
- }
- drm_warn_on_modeset_not_all_locked(dev);
- /*
- * Allocate space for the backup of all (non-pointer) encoder and
- * connector data.
- */
- save_encoder_crtcs = kcalloc(dev->mode_config.num_encoder,
- sizeof(struct drm_crtc *), GFP_KERNEL);
- if (!save_encoder_crtcs)
- return -ENOMEM;
- save_connector_encoders = kcalloc(dev->mode_config.num_connector,
- sizeof(struct drm_encoder *), GFP_KERNEL);
- if (!save_connector_encoders) {
- kfree(save_encoder_crtcs);
- return -ENOMEM;
- }
- /*
- * Copy data. Note that driver private data is not affected.
- * Should anything bad happen only the expected state is
- * restored, not the drivers personal bookkeeping.
- */
- count = 0;
- drm_for_each_encoder(encoder, dev) {
- save_encoder_crtcs[count++] = encoder->crtc;
- }
- count = 0;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter)
- save_connector_encoders[count++] = connector->encoder;
- drm_connector_list_iter_end(&conn_iter);
- save_set.crtc = set->crtc;
- save_set.mode = &set->crtc->mode;
- save_set.x = set->crtc->x;
- save_set.y = set->crtc->y;
- save_set.fb = set->crtc->primary->fb;
- /* We should be able to check here if the fb has the same properties
- * and then just flip_or_move it */
- if (set->crtc->primary->fb != set->fb) {
- /* If we have no fb then treat it as a full mode set */
- if (set->crtc->primary->fb == NULL) {
- DRM_DEBUG_KMS("crtc has no fb, full mode set\n");
- mode_changed = true;
- } else if (set->fb->format != set->crtc->primary->fb->format) {
- mode_changed = true;
- } else
- fb_changed = true;
- }
- if (set->x != set->crtc->x || set->y != set->crtc->y)
- fb_changed = true;
- if (!drm_mode_equal(set->mode, &set->crtc->mode)) {
- DRM_DEBUG_KMS("modes are different, full mode set\n");
- drm_mode_debug_printmodeline(&set->crtc->mode);
- drm_mode_debug_printmodeline(set->mode);
- mode_changed = true;
- }
- /* take a reference on all unbound connectors in set, reuse the
- * already taken reference for bound connectors
- */
- for (ro = 0; ro < set->num_connectors; ro++) {
- if (set->connectors[ro]->encoder)
- continue;
- drm_connector_get(set->connectors[ro]);
- }
- /* a) traverse passed in connector list and get encoders for them */
- count = 0;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
- const struct drm_connector_helper_funcs *connector_funcs =
- connector->helper_private;
- new_encoder = connector->encoder;
- for (ro = 0; ro < set->num_connectors; ro++) {
- if (set->connectors[ro] == connector) {
- if (connector_funcs->best_encoder)
- new_encoder = connector_funcs->best_encoder(connector);
- else
- new_encoder = drm_connector_get_single_encoder(connector);
- /* if we can't get an encoder for a connector
- we are setting now - then fail */
- if (new_encoder == NULL)
- /* don't break so fail path works correct */
- fail = 1;
- if (connector->dpms != DRM_MODE_DPMS_ON) {
- DRM_DEBUG_KMS("connector dpms not on, full mode switch\n");
- mode_changed = true;
- }
- break;
- }
- }
- if (new_encoder != connector->encoder) {
- DRM_DEBUG_KMS("encoder changed, full mode switch\n");
- mode_changed = true;
- /* If the encoder is reused for another connector, then
- * the appropriate crtc will be set later.
- */
- if (connector->encoder)
- connector->encoder->crtc = NULL;
- connector->encoder = new_encoder;
- }
- }
- drm_connector_list_iter_end(&conn_iter);
- if (fail) {
- ret = -EINVAL;
- goto fail;
- }
- count = 0;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter) {
- if (!connector->encoder)
- continue;
- if (connector->encoder->crtc == set->crtc)
- new_crtc = NULL;
- else
- new_crtc = connector->encoder->crtc;
- for (ro = 0; ro < set->num_connectors; ro++) {
- if (set->connectors[ro] == connector)
- new_crtc = set->crtc;
- }
- /* Make sure the new CRTC will work with the encoder */
- if (new_crtc &&
- !drm_encoder_crtc_ok(connector->encoder, new_crtc)) {
- ret = -EINVAL;
- drm_connector_list_iter_end(&conn_iter);
- goto fail;
- }
- if (new_crtc != connector->encoder->crtc) {
- DRM_DEBUG_KMS("crtc changed, full mode switch\n");
- mode_changed = true;
- connector->encoder->crtc = new_crtc;
- }
- if (new_crtc) {
- DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [CRTC:%d:%s]\n",
- connector->base.id, connector->name,
- new_crtc->base.id, new_crtc->name);
- } else {
- DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n",
- connector->base.id, connector->name);
- }
- }
- drm_connector_list_iter_end(&conn_iter);
- /* mode_set_base is not a required function */
- if (fb_changed && !crtc_funcs->mode_set_base)
- mode_changed = true;
- if (mode_changed) {
- if (drm_helper_crtc_in_use(set->crtc)) {
- DRM_DEBUG_KMS("attempting to set mode from"
- " userspace\n");
- drm_mode_debug_printmodeline(set->mode);
- set->crtc->primary->fb = set->fb;
- if (!drm_crtc_helper_set_mode(set->crtc, set->mode,
- set->x, set->y,
- save_set.fb)) {
- DRM_ERROR("failed to set mode on [CRTC:%d:%s]\n",
- set->crtc->base.id, set->crtc->name);
- set->crtc->primary->fb = save_set.fb;
- ret = -EINVAL;
- goto fail;
- }
- DRM_DEBUG_KMS("Setting connector DPMS state to on\n");
- for (i = 0; i < set->num_connectors; i++) {
- DRM_DEBUG_KMS("\t[CONNECTOR:%d:%s] set DPMS on\n", set->connectors[i]->base.id,
- set->connectors[i]->name);
- set->connectors[i]->funcs->dpms(set->connectors[i], DRM_MODE_DPMS_ON);
- }
- }
- __drm_helper_disable_unused_functions(dev);
- } else if (fb_changed) {
- set->crtc->x = set->x;
- set->crtc->y = set->y;
- set->crtc->primary->fb = set->fb;
- ret = crtc_funcs->mode_set_base(set->crtc,
- set->x, set->y, save_set.fb);
- if (ret != 0) {
- set->crtc->x = save_set.x;
- set->crtc->y = save_set.y;
- set->crtc->primary->fb = save_set.fb;
- goto fail;
- }
- }
- kfree(save_connector_encoders);
- kfree(save_encoder_crtcs);
- return 0;
- fail:
- /* Restore all previous data. */
- count = 0;
- drm_for_each_encoder(encoder, dev) {
- encoder->crtc = save_encoder_crtcs[count++];
- }
- count = 0;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter)
- connector->encoder = save_connector_encoders[count++];
- drm_connector_list_iter_end(&conn_iter);
- /* after fail drop reference on all unbound connectors in set, let
- * bound connectors keep their reference
- */
- for (ro = 0; ro < set->num_connectors; ro++) {
- if (set->connectors[ro]->encoder)
- continue;
- drm_connector_put(set->connectors[ro]);
- }
- /* Try to restore the config */
- if (mode_changed &&
- !drm_crtc_helper_set_mode(save_set.crtc, save_set.mode, save_set.x,
- save_set.y, save_set.fb))
- DRM_ERROR("failed to restore config after modeset failure\n");
- kfree(save_connector_encoders);
- kfree(save_encoder_crtcs);
- return ret;
- }
- EXPORT_SYMBOL(drm_crtc_helper_set_config);
- static int drm_helper_choose_encoder_dpms(struct drm_encoder *encoder)
- {
- int dpms = DRM_MODE_DPMS_OFF;
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- struct drm_device *dev = encoder->dev;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter)
- if (connector->encoder == encoder)
- if (connector->dpms < dpms)
- dpms = connector->dpms;
- drm_connector_list_iter_end(&conn_iter);
- return dpms;
- }
- /* Helper which handles bridge ordering around encoder dpms */
- static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode)
- {
- const struct drm_encoder_helper_funcs *encoder_funcs;
- encoder_funcs = encoder->helper_private;
- if (!encoder_funcs)
- return;
- if (encoder_funcs->dpms)
- encoder_funcs->dpms(encoder, mode);
- }
- static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc)
- {
- int dpms = DRM_MODE_DPMS_OFF;
- struct drm_connector *connector;
- struct drm_connector_list_iter conn_iter;
- struct drm_device *dev = crtc->dev;
- drm_connector_list_iter_begin(dev, &conn_iter);
- drm_for_each_connector_iter(connector, &conn_iter)
- if (connector->encoder && connector->encoder->crtc == crtc)
- if (connector->dpms < dpms)
- dpms = connector->dpms;
- drm_connector_list_iter_end(&conn_iter);
- return dpms;
- }
- /**
- * drm_helper_connector_dpms() - connector dpms helper implementation
- * @connector: affected connector
- * @mode: DPMS mode
- *
- * The drm_helper_connector_dpms() helper function implements the
- * &drm_connector_funcs.dpms callback for drivers using the legacy CRTC
- * helpers.
- *
- * This is the main helper function provided by the CRTC helper framework for
- * implementing the DPMS connector attribute. It computes the new desired DPMS
- * state for all encoders and CRTCs in the output mesh and calls the
- * &drm_crtc_helper_funcs.dpms and &drm_encoder_helper_funcs.dpms callbacks
- * provided by the driver.
- *
- * This function is deprecated. New drivers must implement atomic modeset
- * support, where DPMS is handled in the DRM core.
- *
- * Returns:
- * Always returns 0.
- */
- int drm_helper_connector_dpms(struct drm_connector *connector, int mode)
- {
- struct drm_encoder *encoder = connector->encoder;
- struct drm_crtc *crtc = encoder ? encoder->crtc : NULL;
- int old_dpms, encoder_dpms = DRM_MODE_DPMS_OFF;
- WARN_ON(drm_drv_uses_atomic_modeset(connector->dev));
- if (mode == connector->dpms)
- return 0;
- old_dpms = connector->dpms;
- connector->dpms = mode;
- if (encoder)
- encoder_dpms = drm_helper_choose_encoder_dpms(encoder);
- /* from off to on, do crtc then encoder */
- if (mode < old_dpms) {
- if (crtc) {
- const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
- if (crtc_funcs->dpms)
- (*crtc_funcs->dpms) (crtc,
- drm_helper_choose_crtc_dpms(crtc));
- }
- if (encoder)
- drm_helper_encoder_dpms(encoder, encoder_dpms);
- }
- /* from on to off, do encoder then crtc */
- if (mode > old_dpms) {
- if (encoder)
- drm_helper_encoder_dpms(encoder, encoder_dpms);
- if (crtc) {
- const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private;
- if (crtc_funcs->dpms)
- (*crtc_funcs->dpms) (crtc,
- drm_helper_choose_crtc_dpms(crtc));
- }
- }
- return 0;
- }
- EXPORT_SYMBOL(drm_helper_connector_dpms);
- /**
- * drm_helper_resume_force_mode - force-restore mode setting configuration
- * @dev: drm_device which should be restored
- *
- * Drivers which use the mode setting helpers can use this function to
- * force-restore the mode setting configuration e.g. on resume or when something
- * else might have trampled over the hw state (like some overzealous old BIOSen
- * tended to do).
- *
- * This helper doesn't provide a error return value since restoring the old
- * config should never fail due to resource allocation issues since the driver
- * has successfully set the restored configuration already. Hence this should
- * boil down to the equivalent of a few dpms on calls, which also don't provide
- * an error code.
- *
- * Drivers where simply restoring an old configuration again might fail (e.g.
- * due to slight differences in allocating shared resources when the
- * configuration is restored in a different order than when userspace set it up)
- * need to use their own restore logic.
- *
- * This function is deprecated. New drivers should implement atomic mode-
- * setting and use the atomic suspend/resume helpers.
- *
- * See also:
- * drm_atomic_helper_suspend(), drm_atomic_helper_resume()
- */
- void drm_helper_resume_force_mode(struct drm_device *dev)
- {
- struct drm_crtc *crtc;
- struct drm_encoder *encoder;
- const struct drm_crtc_helper_funcs *crtc_funcs;
- int encoder_dpms;
- bool ret;
- WARN_ON(drm_drv_uses_atomic_modeset(dev));
- drm_modeset_lock_all(dev);
- drm_for_each_crtc(crtc, dev) {
- if (!crtc->enabled)
- continue;
- ret = drm_crtc_helper_set_mode(crtc, &crtc->mode,
- crtc->x, crtc->y, crtc->primary->fb);
- /* Restoring the old config should never fail! */
- if (ret == false)
- DRM_ERROR("failed to set mode on crtc %p\n", crtc);
- /* Turn off outputs that were already powered off */
- if (drm_helper_choose_crtc_dpms(crtc)) {
- drm_for_each_encoder(encoder, dev) {
- if(encoder->crtc != crtc)
- continue;
- encoder_dpms = drm_helper_choose_encoder_dpms(
- encoder);
- drm_helper_encoder_dpms(encoder, encoder_dpms);
- }
- crtc_funcs = crtc->helper_private;
- if (crtc_funcs->dpms)
- (*crtc_funcs->dpms) (crtc,
- drm_helper_choose_crtc_dpms(crtc));
- }
- }
- /* disable the unused connectors while restoring the modesetting */
- __drm_helper_disable_unused_functions(dev);
- drm_modeset_unlock_all(dev);
- }
- EXPORT_SYMBOL(drm_helper_resume_force_mode);
- /**
- * drm_helper_force_disable_all - Forcibly turn off all enabled CRTCs
- * @dev: DRM device whose CRTCs to turn off
- *
- * Drivers may want to call this on unload to ensure that all displays are
- * unlit and the GPU is in a consistent, low power state. Takes modeset locks.
- *
- * Note: This should only be used by non-atomic legacy drivers. For an atomic
- * version look at drm_atomic_helper_shutdown().
- *
- * Returns:
- * Zero on success, error code on failure.
- */
- int drm_helper_force_disable_all(struct drm_device *dev)
- {
- struct drm_crtc *crtc;
- int ret = 0;
- drm_modeset_lock_all(dev);
- drm_for_each_crtc(crtc, dev)
- if (crtc->enabled) {
- struct drm_mode_set set = {
- .crtc = crtc,
- };
- ret = drm_mode_set_config_internal(&set);
- if (ret)
- goto out;
- }
- out:
- drm_modeset_unlock_all(dev);
- return ret;
- }
- EXPORT_SYMBOL(drm_helper_force_disable_all);
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