--- /dev/null
+/*
+ * 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().
+ *
+ * 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.
+ */
+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));
+ }
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+ 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));
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head)
+ 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->bridge)
+ encoder->bridge->funcs->disable(encoder->bridge);
+
+ if (encoder_funcs->disable)
+ (*encoder_funcs->disable)(encoder);
+ else
+ (*encoder_funcs->dpms)(encoder, DRM_MODE_DPMS_OFF);
+
+ if (encoder->bridge)
+ encoder->bridge->funcs->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);
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ if (!drm_helper_encoder_in_use(encoder)) {
+ drm_encoder_disable(encoder);
+ /* disconnect encoder from any connector */
+ encoder->crtc = NULL;
+ }
+ }
+
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+ 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;
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ 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.
+ */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+
+ if (encoder->crtc != crtc)
+ continue;
+
+ if (encoder->bridge && encoder->bridge->funcs->mode_fixup) {
+ ret = encoder->bridge->funcs->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. */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+
+ if (encoder->crtc != crtc)
+ continue;
+
+ if (encoder->bridge)
+ encoder->bridge->funcs->disable(encoder->bridge);
+
+ encoder_funcs = encoder->helper_private;
+ /* Disable the encoders as the first thing we do. */
+ encoder_funcs->prepare(encoder);
+
+ if (encoder->bridge)
+ encoder->bridge->funcs->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;
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+
+ 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);
+
+ if (encoder->bridge && encoder->bridge->funcs->mode_set)
+ encoder->bridge->funcs->mode_set(encoder->bridge, mode,
+ adjusted_mode);
+ }
+
+ /* Now enable the clocks, plane, pipe, and connectors that we set up. */
+ crtc_funcs->commit(crtc);
+
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+
+ if (encoder->crtc != crtc)
+ continue;
+
+ if (encoder->bridge)
+ encoder->bridge->funcs->pre_enable(encoder->bridge);
+
+ encoder_funcs = encoder->helper_private;
+ encoder_funcs->commit(encoder);
+
+ if (encoder->bridge)
+ encoder->bridge->funcs->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 */
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ if (encoder->crtc != crtc)
+ continue;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ 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
+ *
+ * Setup a new configuration, provided by the upper layers (either an ioctl call
+ * from userspace or internally e.g. from the fbdev support code) in @set, and
+ * enable it. This is the main helper functions for drivers that implement
+ * kernel mode setting with the crtc helper functions and the assorted
+ * ->prepare(), ->modeset() and ->commit() helper callbacks.
+ *
+ * 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;
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ save_encoders[count++] = *encoder;
+ }
+
+ count = 0;
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ 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;
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ 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;
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ 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;
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+ *encoder = save_encoders[count++];
+ }
+
+ count = 0;
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head) {
+ *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;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+ 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 (bridge) {
+ if (mode == DRM_MODE_DPMS_ON)
+ bridge->funcs->pre_enable(bridge);
+ else
+ bridge->funcs->disable(bridge);
+ }
+
+ encoder_funcs = encoder->helper_private;
+ if (encoder_funcs->dpms)
+ encoder_funcs->dpms(encoder, mode);
+
+ if (bridge) {
+ if (mode == DRM_MODE_DPMS_ON)
+ bridge->funcs->enable(bridge);
+ else
+ bridge->funcs->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;
+
+ list_for_each_entry(connector, &dev->mode_config.connector_list, head)
+ 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
+ *
+ * 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()
+ * callback provided by the driver appropriately.
+ */
+void 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;
+
+ 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;
+}
+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,
+ 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.
+ */
+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);
+ list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) {
+
+ 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)) {
+ list_for_each_entry(encoder, &dev->mode_config.encoder_list, head) {
+
+ 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)
+ crtc_state = kmemdup(crtc->state, sizeof(*crtc_state),
+ GFP_KERNEL);
+ else
+ crtc_state = kzalloc(sizeof(*crtc_state), GFP_KERNEL);
+ if (!crtc_state)
+ return -ENOMEM;
+ crtc_state->crtc = crtc;
+
+ crtc_state->enable = true;
+ crtc_state->planes_changed = true;
+ crtc_state->mode_changed = true;
+ drm_mode_copy(&crtc_state->mode, mode);
+ drm_mode_copy(&crtc_state->adjusted_mode, adjusted_mode);
+
+ if (crtc_funcs->atomic_check) {
+ ret = crtc_funcs->atomic_check(crtc, crtc_state);
+ if (ret) {
+ kfree(crtc_state);
+
+ return ret;
+ }
+ }
+
+ swap(crtc->state, crtc_state);
+
+ crtc_funcs->mode_set_nofb(crtc);
+
+ if (crtc_state) {
+ if (crtc->funcs->atomic_destroy_state)
+ crtc->funcs->atomic_destroy_state(crtc, crtc_state);
+ else
+ kfree(crtc_state);
+ }
+
+ return drm_helper_crtc_mode_set_base(crtc, x, y, old_fb);
+}
+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);
Code Review / kvmfornfv.git / blobdiff