| /* |
| * 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/kernel.h> |
| #include <linux/export.h> |
| #include <linux/moduleparam.h> |
| |
| #include <drm/drmP.h> |
| #include <drm/drm_atomic.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_plane_helper.h> |
| #include <drm/drm_atomic_helper.h> |
| #include <drm/drm_edid.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 ->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. |
| */ |
| MODULE_AUTHOR("David Airlie, Jesse Barnes"); |
| MODULE_DESCRIPTION("DRM KMS helper"); |
| MODULE_LICENSE("GPL and additional rights"); |
| |
| /** |
| * drm_helper_move_panel_connectors_to_head() - move panels to the front in the |
| * connector list |
| * @dev: drm device to operate on |
| * |
| * Some userspace presumes that the first connected connector is the main |
| * display, where it's supposed to display e.g. the login screen. For |
| * laptops, this should be the main panel. Use this function to sort all |
| * (eDP/LVDS) panels to the front of the connector list, instead of |
| * painstakingly trying to initialize them in the right order. |
| */ |
| void drm_helper_move_panel_connectors_to_head(struct drm_device *dev) |
| { |
| struct drm_connector *connector, *tmp; |
| struct list_head panel_list; |
| |
| INIT_LIST_HEAD(&panel_list); |
| |
| list_for_each_entry_safe(connector, tmp, |
| &dev->mode_config.connector_list, head) { |
| if (connector->connector_type == DRM_MODE_CONNECTOR_LVDS || |
| connector->connector_type == DRM_MODE_CONNECTOR_eDP) |
| list_move_tail(&connector->head, &panel_list); |
| } |
| |
| list_splice(&panel_list, &dev->mode_config.connector_list); |
| } |
| EXPORT_SYMBOL(drm_helper_move_panel_connectors_to_head); |
| |
| /** |
| * 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_device *dev = encoder->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_for_each_connector(connector, dev) |
| if (connector->encoder == encoder) |
| return true; |
| 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; |
| |
| /* |
| * 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; |
| |
| drm_bridge_disable(encoder->bridge); |
| |
| if (encoder_funcs->disable) |
| (*encoder_funcs->disable)(encoder); |
| else |
| (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF); |
| |
| drm_bridge_post_disable(encoder->bridge); |
| } |
| |
| 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. |
| */ |
| void drm_helper_disable_unused_functions(struct drm_device *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; |
| /* Disable unused encoders */ |
| if (encoder->crtc == NULL) |
| drm_encoder_disable(encoder); |
| /* Disable encoders whose CRTC is about to change */ |
| if (encoder_funcs->get_crtc && |
| encoder->crtc != (*encoder_funcs->get_crtc)(encoder)) |
| 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; |
| |
| 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; |
| |
| ret = drm_bridge_mode_fixup(encoder->bridge, |
| mode, adjusted_mode); |
| if (!ret) { |
| DRM_DEBUG_KMS("Bridge fixup failed\n"); |
| goto done; |
| } |
| |
| encoder_funcs = encoder->helper_private; |
| if (!(ret = encoder_funcs->mode_fixup(encoder, mode, |
| adjusted_mode))) { |
| DRM_DEBUG_KMS("Encoder fixup failed\n"); |
| goto done; |
| } |
| } |
| |
| if (!(ret = crtc_funcs->mode_fixup(crtc, mode, adjusted_mode))) { |
| DRM_DEBUG_KMS("CRTC fixup failed\n"); |
| goto done; |
| } |
| DRM_DEBUG_KMS("[CRTC:%d]\n", crtc->base.id); |
| |
| crtc->hwmode = *adjusted_mode; |
| |
| /* Prepare the encoders and CRTCs before setting the mode. */ |
| drm_for_each_encoder(encoder, dev) { |
| |
| if (encoder->crtc != crtc) |
| continue; |
| |
| drm_bridge_disable(encoder->bridge); |
| |
| encoder_funcs = encoder->helper_private; |
| /* Disable the encoders as the first thing we do. */ |
| encoder_funcs->prepare(encoder); |
| |
| drm_bridge_post_disable(encoder->bridge); |
| } |
| |
| 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; |
| |
| DRM_DEBUG_KMS("[ENCODER:%d:%s] set [MODE:%d:%s]\n", |
| encoder->base.id, encoder->name, |
| mode->base.id, mode->name); |
| encoder_funcs = encoder->helper_private; |
| encoder_funcs->mode_set(encoder, mode, adjusted_mode); |
| |
| drm_bridge_mode_set(encoder->bridge, 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; |
| |
| drm_bridge_pre_enable(encoder->bridge); |
| |
| encoder_funcs = encoder->helper_private; |
| encoder_funcs->commit(encoder); |
| |
| drm_bridge_enable(encoder->bridge); |
| } |
| |
| /* 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) { |
| if (encoder->crtc != crtc) |
| continue; |
| |
| drm_for_each_connector(connector, dev) { |
| 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; |
| } |
| } |
| |
| __drm_helper_disable_unused_functions(dev); |
| } |
| |
| /** |
| * drm_crtc_helper_set_config - set a new config from userspace |
| * @set: mode set configuration |
| * |
| * The drm_crtc_helper_set_config() helper function implements the set_config |
| * callback of struct &drm_crtc_funcs for drivers using the legacy CRTC helpers. |
| * |
| * It first tries to locate the best encoder for each connector by calling the |
| * connector ->best_encoder() (struct &drm_connector_helper_funcs) 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 ->mode_set_base() (struct &drm_crtc_helper_funcs) 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_device *dev; |
| struct drm_crtc *new_crtc; |
| struct drm_encoder *save_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 *save_connectors, *connector; |
| 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; |
| |
| if (!set->mode) |
| set->fb = NULL; |
| |
| if (set->fb) { |
| DRM_DEBUG_KMS("[CRTC:%d] [FB:%d] #connectors=%d (x y) (%i %i)\n", |
| set->crtc->base.id, set->fb->base.id, |
| (int)set->num_connectors, set->x, set->y); |
| } else { |
| DRM_DEBUG_KMS("[CRTC:%d] [NOFB]\n", set->crtc->base.id); |
| drm_crtc_helper_disable(set->crtc); |
| return 0; |
| } |
| |
| dev = set->crtc->dev; |
| |
| drm_warn_on_modeset_not_all_locked(dev); |
| |
| /* |
| * Allocate space for the backup of all (non-pointer) encoder and |
| * connector data. |
| */ |
| save_encoders = kzalloc(dev->mode_config.num_encoder * |
| sizeof(struct drm_encoder), GFP_KERNEL); |
| if (!save_encoders) |
| return -ENOMEM; |
| |
| save_connectors = kzalloc(dev->mode_config.num_connector * |
| sizeof(struct drm_connector), GFP_KERNEL); |
| if (!save_connectors) { |
| kfree(save_encoders); |
| 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_encoders[count++] = *encoder; |
| } |
| |
| count = 0; |
| drm_for_each_connector(connector, dev) { |
| save_connectors[count++] = *connector; |
| } |
| |
| 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 == NULL) { |
| mode_changed = true; |
| } else if (set->fb->pixel_format != |
| set->crtc->primary->fb->pixel_format) { |
| mode_changed = true; |
| } else |
| fb_changed = true; |
| } |
| |
| if (set->x != set->crtc->x || set->y != set->crtc->y) |
| fb_changed = true; |
| |
| if (set->mode && !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; |
| } |
| |
| /* a) traverse passed in connector list and get encoders for them */ |
| count = 0; |
| drm_for_each_connector(connector, dev) { |
| 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) { |
| new_encoder = connector_funcs->best_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; |
| } |
| } |
| |
| if (fail) { |
| ret = -EINVAL; |
| goto fail; |
| } |
| |
| count = 0; |
| drm_for_each_connector(connector, dev) { |
| 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; |
| 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]\n", |
| connector->base.id, connector->name, |
| new_crtc->base.id); |
| } else { |
| DRM_DEBUG_KMS("[CONNECTOR:%d:%s] to [NOCRTC]\n", |
| connector->base.id, connector->name); |
| } |
| } |
| |
| /* 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]\n", |
| set->crtc->base.id); |
| 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_connectors); |
| kfree(save_encoders); |
| return 0; |
| |
| fail: |
| /* Restore all previous data. */ |
| count = 0; |
| drm_for_each_encoder(encoder, dev) { |
| *encoder = save_encoders[count++]; |
| } |
| |
| count = 0; |
| drm_for_each_connector(connector, dev) { |
| *connector = save_connectors[count++]; |
| } |
| |
| /* 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_connectors); |
| kfree(save_encoders); |
| 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_device *dev = encoder->dev; |
| |
| drm_for_each_connector(connector, dev) |
| if (connector->encoder == encoder) |
| if (connector->dpms < dpms) |
| dpms = connector->dpms; |
| return dpms; |
| } |
| |
| /* Helper which handles bridge ordering around encoder dpms */ |
| static void drm_helper_encoder_dpms(struct drm_encoder *encoder, int mode) |
| { |
| struct drm_bridge *bridge = encoder->bridge; |
| const struct drm_encoder_helper_funcs *encoder_funcs; |
| |
| if (mode == DRM_MODE_DPMS_ON) |
| drm_bridge_pre_enable(bridge); |
| else |
| drm_bridge_disable(bridge); |
| |
| encoder_funcs = encoder->helper_private; |
| if (encoder_funcs->dpms) |
| encoder_funcs->dpms(encoder, mode); |
| |
| if (mode == DRM_MODE_DPMS_ON) |
| drm_bridge_enable(bridge); |
| else |
| drm_bridge_post_disable(bridge); |
| } |
| |
| static int drm_helper_choose_crtc_dpms(struct drm_crtc *crtc) |
| { |
| int dpms = DRM_MODE_DPMS_OFF; |
| struct drm_connector *connector; |
| struct drm_device *dev = crtc->dev; |
| |
| drm_for_each_connector(connector, dev) |
| if (connector->encoder && connector->encoder->crtc == crtc) |
| if (connector->dpms < dpms) |
| dpms = connector->dpms; |
| 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 ->dpms() |
| * callback of struct &drm_connector_funcs 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 ->dpms() |
| * callbacks provided by the driver in struct &drm_crtc_helper_funcs and struct |
| * &drm_encoder_helper_funcs appropriately. |
| * |
| * This function is deprecated. New drivers must implement atomic modeset |
| * support, for which this function is unsuitable. Instead drivers should use |
| * drm_atomic_helper_connector_dpms(). |
| * |
| * 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; |
| |
| 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_mode_fill_fb_struct - fill out framebuffer metadata |
| * @fb: drm_framebuffer object to fill out |
| * @mode_cmd: metadata from the userspace fb creation request |
| * |
| * This helper can be used in a drivers fb_create callback to pre-fill the fb's |
| * metadata fields. |
| */ |
| void drm_helper_mode_fill_fb_struct(struct drm_framebuffer *fb, |
| const struct drm_mode_fb_cmd2 *mode_cmd) |
| { |
| int i; |
| |
| fb->width = mode_cmd->width; |
| fb->height = mode_cmd->height; |
| for (i = 0; i < 4; i++) { |
| fb->pitches[i] = mode_cmd->pitches[i]; |
| fb->offsets[i] = mode_cmd->offsets[i]; |
| fb->modifier[i] = mode_cmd->modifier[i]; |
| } |
| drm_fb_get_bpp_depth(mode_cmd->pixel_format, &fb->depth, |
| &fb->bits_per_pixel); |
| fb->pixel_format = mode_cmd->pixel_format; |
| fb->flags = mode_cmd->flags; |
| } |
| EXPORT_SYMBOL(drm_helper_mode_fill_fb_struct); |
| |
| /** |
| * 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; |
| |
| 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_crtc_mode_set - mode_set implementation for atomic plane helpers |
| * @crtc: DRM CRTC |
| * @mode: DRM display mode which userspace requested |
| * @adjusted_mode: DRM display mode adjusted by ->mode_fixup callbacks |
| * @x: x offset of the CRTC scanout area on the underlying framebuffer |
| * @y: y offset of the CRTC scanout area on the underlying framebuffer |
| * @old_fb: previous framebuffer |
| * |
| * This function implements a callback useable as the ->mode_set callback |
| * required by the CRTC helpers. Besides the atomic plane helper functions for |
| * the primary plane the driver must also provide the ->mode_set_nofb callback |
| * to set up the CRTC. |
| * |
| * This is a transitional helper useful for converting drivers to the atomic |
| * interfaces. |
| */ |
| int drm_helper_crtc_mode_set(struct drm_crtc *crtc, struct drm_display_mode *mode, |
| struct drm_display_mode *adjusted_mode, int x, int y, |
| struct drm_framebuffer *old_fb) |
| { |
| struct drm_crtc_state *crtc_state; |
| const struct drm_crtc_helper_funcs *crtc_funcs = crtc->helper_private; |
| int ret; |
| |
| if (crtc->funcs->atomic_duplicate_state) |
| crtc_state = crtc->funcs->atomic_duplicate_state(crtc); |
| else { |
| if (!crtc->state) |
| drm_atomic_helper_crtc_reset(crtc); |
| |
| crtc_state = drm_atomic_helper_crtc_duplicate_state(crtc); |
| } |
| |
| if (!crtc_state) |
| return -ENOMEM; |
| |
| crtc_state->planes_changed = true; |
| crtc_state->mode_changed = true; |
| ret = drm_atomic_set_mode_for_crtc(crtc_state, mode); |
| if (ret) |
| goto out; |
| drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode); |
| |
| if (crtc_funcs->atomic_check) { |
| ret = crtc_funcs->atomic_check(crtc, crtc_state); |
| if (ret) |
| goto out; |
| } |
| |
| swap(crtc->state, crtc_state); |
| |
| crtc_funcs->mode_set_nofb(crtc); |
| |
| ret = drm_helper_crtc_mode_set_base(crtc, x, y, old_fb); |
| |
| out: |
| if (crtc_state) { |
| if (crtc->funcs->atomic_destroy_state) |
| crtc->funcs->atomic_destroy_state(crtc, crtc_state); |
| else |
| drm_atomic_helper_crtc_destroy_state(crtc, crtc_state); |
| } |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_helper_crtc_mode_set); |
| |
| /** |
| * drm_helper_crtc_mode_set_base - mode_set_base implementation for atomic plane helpers |
| * @crtc: DRM CRTC |
| * @x: x offset of the CRTC scanout area on the underlying framebuffer |
| * @y: y offset of the CRTC scanout area on the underlying framebuffer |
| * @old_fb: previous framebuffer |
| * |
| * This function implements a callback useable as the ->mode_set_base used |
| * required by the CRTC helpers. The driver must provide the atomic plane helper |
| * functions for the primary plane. |
| * |
| * This is a transitional helper useful for converting drivers to the atomic |
| * interfaces. |
| */ |
| int drm_helper_crtc_mode_set_base(struct drm_crtc *crtc, int x, int y, |
| struct drm_framebuffer *old_fb) |
| { |
| struct drm_plane_state *plane_state; |
| struct drm_plane *plane = crtc->primary; |
| |
| if (plane->funcs->atomic_duplicate_state) |
| plane_state = plane->funcs->atomic_duplicate_state(plane); |
| else if (plane->state) |
| plane_state = drm_atomic_helper_plane_duplicate_state(plane); |
| else |
| plane_state = kzalloc(sizeof(*plane_state), GFP_KERNEL); |
| if (!plane_state) |
| return -ENOMEM; |
| plane_state->plane = plane; |
| |
| plane_state->crtc = crtc; |
| drm_atomic_set_fb_for_plane(plane_state, crtc->primary->fb); |
| plane_state->crtc_x = 0; |
| plane_state->crtc_y = 0; |
| plane_state->crtc_h = crtc->mode.vdisplay; |
| plane_state->crtc_w = crtc->mode.hdisplay; |
| plane_state->src_x = x << 16; |
| plane_state->src_y = y << 16; |
| plane_state->src_h = crtc->mode.vdisplay << 16; |
| plane_state->src_w = crtc->mode.hdisplay << 16; |
| |
| return drm_plane_helper_commit(plane, plane_state, old_fb); |
| } |
| EXPORT_SYMBOL(drm_helper_crtc_mode_set_base); |