| /* |
| * Copyright (c) 2006-2009 Red Hat Inc. |
| * Copyright (c) 2006-2008 Intel Corporation |
| * Copyright (c) 2007 Dave Airlie <airlied@linux.ie> |
| * |
| * DRM framebuffer helper 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: |
| * Dave Airlie <airlied@linux.ie> |
| * Jesse Barnes <jesse.barnes@intel.com> |
| */ |
| #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
| |
| #include <linux/console.h> |
| #include <linux/kernel.h> |
| #include <linux/sysrq.h> |
| #include <linux/slab.h> |
| #include <linux/module.h> |
| #include <drm/drmP.h> |
| #include <drm/drm_crtc.h> |
| #include <drm/drm_fb_helper.h> |
| #include <drm/drm_crtc_helper.h> |
| #include <drm/drm_atomic.h> |
| #include <drm/drm_atomic_helper.h> |
| |
| #include "drm_crtc_helper_internal.h" |
| |
| static bool drm_fbdev_emulation = true; |
| module_param_named(fbdev_emulation, drm_fbdev_emulation, bool, 0600); |
| MODULE_PARM_DESC(fbdev_emulation, |
| "Enable legacy fbdev emulation [default=true]"); |
| |
| static LIST_HEAD(kernel_fb_helper_list); |
| static DEFINE_MUTEX(kernel_fb_helper_lock); |
| |
| /** |
| * DOC: fbdev helpers |
| * |
| * The fb helper functions are useful to provide an fbdev on top of a drm kernel |
| * mode setting driver. They can be used mostly independently from the crtc |
| * helper functions used by many drivers to implement the kernel mode setting |
| * interfaces. |
| * |
| * Initialization is done as a four-step process with drm_fb_helper_prepare(), |
| * drm_fb_helper_init(), drm_fb_helper_single_add_all_connectors() and |
| * drm_fb_helper_initial_config(). Drivers with fancier requirements than the |
| * default behaviour can override the third step with their own code. |
| * Teardown is done with drm_fb_helper_fini(). |
| * |
| * At runtime drivers should restore the fbdev console by calling |
| * drm_fb_helper_restore_fbdev_mode_unlocked() from their ->lastclose callback. |
| * They should also notify the fb helper code from updates to the output |
| * configuration by calling drm_fb_helper_hotplug_event(). For easier |
| * integration with the output polling code in drm_crtc_helper.c the modeset |
| * code provides a ->output_poll_changed callback. |
| * |
| * All other functions exported by the fb helper library can be used to |
| * implement the fbdev driver interface by the driver. |
| * |
| * It is possible, though perhaps somewhat tricky, to implement race-free |
| * hotplug detection using the fbdev helpers. The drm_fb_helper_prepare() |
| * helper must be called first to initialize the minimum required to make |
| * hotplug detection work. Drivers also need to make sure to properly set up |
| * the dev->mode_config.funcs member. After calling drm_kms_helper_poll_init() |
| * it is safe to enable interrupts and start processing hotplug events. At the |
| * same time, drivers should initialize all modeset objects such as CRTCs, |
| * encoders and connectors. To finish up the fbdev helper initialization, the |
| * drm_fb_helper_init() function is called. To probe for all attached displays |
| * and set up an initial configuration using the detected hardware, drivers |
| * should call drm_fb_helper_single_add_all_connectors() followed by |
| * drm_fb_helper_initial_config(). |
| * |
| * If &drm_framebuffer_funcs ->dirty is set, the |
| * drm_fb_helper_{cfb,sys}_{write,fillrect,copyarea,imageblit} functions will |
| * accumulate changes and schedule &drm_fb_helper ->dirty_work to run right |
| * away. This worker then calls the dirty() function ensuring that it will |
| * always run in process context since the fb_*() function could be running in |
| * atomic context. If drm_fb_helper_deferred_io() is used as the deferred_io |
| * callback it will also schedule dirty_work with the damage collected from the |
| * mmap page writes. |
| */ |
| |
| #define drm_fb_helper_for_each_connector(fbh, i__) \ |
| for (({ lockdep_assert_held(&(fbh)->dev->mode_config.mutex); }), \ |
| i__ = 0; i__ < (fbh)->connector_count; i__++) |
| |
| /** |
| * drm_fb_helper_single_add_all_connectors() - add all connectors to fbdev |
| * emulation helper |
| * @fb_helper: fbdev initialized with drm_fb_helper_init |
| * |
| * This functions adds all the available connectors for use with the given |
| * fb_helper. This is a separate step to allow drivers to freely assign |
| * connectors to the fbdev, e.g. if some are reserved for special purposes or |
| * not adequate to be used for the fbcon. |
| * |
| * This function is protected against concurrent connector hotadds/removals |
| * using drm_fb_helper_add_one_connector() and |
| * drm_fb_helper_remove_one_connector(). |
| */ |
| int drm_fb_helper_single_add_all_connectors(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_connector *connector; |
| int i, ret; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| mutex_lock(&dev->mode_config.mutex); |
| drm_for_each_connector(connector, dev) { |
| ret = drm_fb_helper_add_one_connector(fb_helper, connector); |
| |
| if (ret) |
| goto fail; |
| } |
| mutex_unlock(&dev->mode_config.mutex); |
| return 0; |
| fail: |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| struct drm_fb_helper_connector *fb_helper_connector = |
| fb_helper->connector_info[i]; |
| |
| drm_connector_unreference(fb_helper_connector->connector); |
| |
| kfree(fb_helper_connector); |
| fb_helper->connector_info[i] = NULL; |
| } |
| fb_helper->connector_count = 0; |
| mutex_unlock(&dev->mode_config.mutex); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_single_add_all_connectors); |
| |
| int drm_fb_helper_add_one_connector(struct drm_fb_helper *fb_helper, struct drm_connector *connector) |
| { |
| struct drm_fb_helper_connector **temp; |
| struct drm_fb_helper_connector *fb_helper_connector; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); |
| if (fb_helper->connector_count + 1 > fb_helper->connector_info_alloc_count) { |
| temp = krealloc(fb_helper->connector_info, sizeof(struct drm_fb_helper_connector *) * (fb_helper->connector_count + 1), GFP_KERNEL); |
| if (!temp) |
| return -ENOMEM; |
| |
| fb_helper->connector_info_alloc_count = fb_helper->connector_count + 1; |
| fb_helper->connector_info = temp; |
| } |
| |
| |
| fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); |
| if (!fb_helper_connector) |
| return -ENOMEM; |
| |
| drm_connector_reference(connector); |
| fb_helper_connector->connector = connector; |
| fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_add_one_connector); |
| |
| int drm_fb_helper_remove_one_connector(struct drm_fb_helper *fb_helper, |
| struct drm_connector *connector) |
| { |
| struct drm_fb_helper_connector *fb_helper_connector; |
| int i, j; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| WARN_ON(!mutex_is_locked(&fb_helper->dev->mode_config.mutex)); |
| |
| for (i = 0; i < fb_helper->connector_count; i++) { |
| if (fb_helper->connector_info[i]->connector == connector) |
| break; |
| } |
| |
| if (i == fb_helper->connector_count) |
| return -EINVAL; |
| fb_helper_connector = fb_helper->connector_info[i]; |
| drm_connector_unreference(fb_helper_connector->connector); |
| |
| for (j = i + 1; j < fb_helper->connector_count; j++) { |
| fb_helper->connector_info[j - 1] = fb_helper->connector_info[j]; |
| } |
| fb_helper->connector_count--; |
| kfree(fb_helper_connector); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_remove_one_connector); |
| |
| static void drm_fb_helper_save_lut_atomic(struct drm_crtc *crtc, struct drm_fb_helper *helper) |
| { |
| uint16_t *r_base, *g_base, *b_base; |
| int i; |
| |
| if (helper->funcs->gamma_get == NULL) |
| return; |
| |
| r_base = crtc->gamma_store; |
| g_base = r_base + crtc->gamma_size; |
| b_base = g_base + crtc->gamma_size; |
| |
| for (i = 0; i < crtc->gamma_size; i++) |
| helper->funcs->gamma_get(crtc, &r_base[i], &g_base[i], &b_base[i], i); |
| } |
| |
| static void drm_fb_helper_restore_lut_atomic(struct drm_crtc *crtc) |
| { |
| uint16_t *r_base, *g_base, *b_base; |
| |
| if (crtc->funcs->gamma_set == NULL) |
| return; |
| |
| r_base = crtc->gamma_store; |
| g_base = r_base + crtc->gamma_size; |
| b_base = g_base + crtc->gamma_size; |
| |
| crtc->funcs->gamma_set(crtc, r_base, g_base, b_base, crtc->gamma_size); |
| } |
| |
| /** |
| * drm_fb_helper_debug_enter - implementation for ->fb_debug_enter |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_debug_enter(struct fb_info *info) |
| { |
| struct drm_fb_helper *helper = info->par; |
| const struct drm_crtc_helper_funcs *funcs; |
| int i; |
| |
| list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { |
| for (i = 0; i < helper->crtc_count; i++) { |
| struct drm_mode_set *mode_set = |
| &helper->crtc_info[i].mode_set; |
| |
| if (!mode_set->crtc->enabled) |
| continue; |
| |
| funcs = mode_set->crtc->helper_private; |
| if (funcs->mode_set_base_atomic == NULL) |
| continue; |
| |
| drm_fb_helper_save_lut_atomic(mode_set->crtc, helper); |
| funcs->mode_set_base_atomic(mode_set->crtc, |
| mode_set->fb, |
| mode_set->x, |
| mode_set->y, |
| ENTER_ATOMIC_MODE_SET); |
| } |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_debug_enter); |
| |
| /* Find the real fb for a given fb helper CRTC */ |
| static struct drm_framebuffer *drm_mode_config_fb(struct drm_crtc *crtc) |
| { |
| struct drm_device *dev = crtc->dev; |
| struct drm_crtc *c; |
| |
| drm_for_each_crtc(c, dev) { |
| if (crtc->base.id == c->base.id) |
| return c->primary->fb; |
| } |
| |
| return NULL; |
| } |
| |
| /** |
| * drm_fb_helper_debug_leave - implementation for ->fb_debug_leave |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_debug_leave(struct fb_info *info) |
| { |
| struct drm_fb_helper *helper = info->par; |
| struct drm_crtc *crtc; |
| const struct drm_crtc_helper_funcs *funcs; |
| struct drm_framebuffer *fb; |
| int i; |
| |
| for (i = 0; i < helper->crtc_count; i++) { |
| struct drm_mode_set *mode_set = &helper->crtc_info[i].mode_set; |
| crtc = mode_set->crtc; |
| funcs = crtc->helper_private; |
| fb = drm_mode_config_fb(crtc); |
| |
| if (!crtc->enabled) |
| continue; |
| |
| if (!fb) { |
| DRM_ERROR("no fb to restore??\n"); |
| continue; |
| } |
| |
| if (funcs->mode_set_base_atomic == NULL) |
| continue; |
| |
| drm_fb_helper_restore_lut_atomic(mode_set->crtc); |
| funcs->mode_set_base_atomic(mode_set->crtc, fb, crtc->x, |
| crtc->y, LEAVE_ATOMIC_MODE_SET); |
| } |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_debug_leave); |
| |
| static int restore_fbdev_mode_atomic(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_plane *plane; |
| struct drm_atomic_state *state; |
| int i, ret; |
| unsigned plane_mask; |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = dev->mode_config.acquire_ctx; |
| retry: |
| plane_mask = 0; |
| drm_for_each_plane(plane, dev) { |
| struct drm_plane_state *plane_state; |
| |
| plane_state = drm_atomic_get_plane_state(state, plane); |
| if (IS_ERR(plane_state)) { |
| ret = PTR_ERR(plane_state); |
| goto fail; |
| } |
| |
| plane_state->rotation = DRM_ROTATE_0; |
| |
| plane->old_fb = plane->fb; |
| plane_mask |= 1 << drm_plane_index(plane); |
| |
| /* disable non-primary: */ |
| if (plane->type == DRM_PLANE_TYPE_PRIMARY) |
| continue; |
| |
| ret = __drm_atomic_helper_disable_plane(plane, plane_state); |
| if (ret != 0) |
| goto fail; |
| } |
| |
| for(i = 0; i < fb_helper->crtc_count; i++) { |
| struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; |
| |
| ret = __drm_atomic_helper_set_config(mode_set, state); |
| if (ret != 0) |
| goto fail; |
| } |
| |
| ret = drm_atomic_commit(state); |
| |
| fail: |
| drm_atomic_clean_old_fb(dev, plane_mask, ret); |
| |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_put(state); |
| return ret; |
| |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| |
| static int restore_fbdev_mode(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_plane *plane; |
| int i; |
| |
| drm_warn_on_modeset_not_all_locked(dev); |
| |
| if (dev->mode_config.funcs->atomic_commit) |
| return restore_fbdev_mode_atomic(fb_helper); |
| |
| drm_for_each_plane(plane, dev) { |
| if (plane->type != DRM_PLANE_TYPE_PRIMARY) |
| drm_plane_force_disable(plane); |
| |
| if (plane->rotation_property) |
| drm_mode_plane_set_obj_prop(plane, |
| plane->rotation_property, |
| DRM_ROTATE_0); |
| } |
| |
| for (i = 0; i < fb_helper->crtc_count; i++) { |
| struct drm_mode_set *mode_set = &fb_helper->crtc_info[i].mode_set; |
| struct drm_crtc *crtc = mode_set->crtc; |
| int ret; |
| |
| if (crtc->funcs->cursor_set2) { |
| ret = crtc->funcs->cursor_set2(crtc, NULL, 0, 0, 0, 0, 0); |
| if (ret) |
| return ret; |
| } else if (crtc->funcs->cursor_set) { |
| ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); |
| if (ret) |
| return ret; |
| } |
| |
| ret = drm_mode_set_config_internal(mode_set); |
| if (ret) |
| return ret; |
| } |
| |
| return 0; |
| } |
| |
| /** |
| * drm_fb_helper_restore_fbdev_mode_unlocked - restore fbdev configuration |
| * @fb_helper: fbcon to restore |
| * |
| * This should be called from driver's drm ->lastclose callback |
| * when implementing an fbcon on top of kms using this helper. This ensures that |
| * the user isn't greeted with a black screen when e.g. X dies. |
| * |
| * RETURNS: |
| * Zero if everything went ok, negative error code otherwise. |
| */ |
| int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| bool do_delayed; |
| int ret; |
| |
| if (!drm_fbdev_emulation) |
| return -ENODEV; |
| |
| drm_modeset_lock_all(dev); |
| ret = restore_fbdev_mode(fb_helper); |
| |
| do_delayed = fb_helper->delayed_hotplug; |
| if (do_delayed) |
| fb_helper->delayed_hotplug = false; |
| drm_modeset_unlock_all(dev); |
| |
| if (do_delayed) |
| drm_fb_helper_hotplug_event(fb_helper); |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode_unlocked); |
| |
| static bool drm_fb_helper_is_bound(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_crtc *crtc; |
| int bound = 0, crtcs_bound = 0; |
| |
| /* Sometimes user space wants everything disabled, so don't steal the |
| * display if there's a master. */ |
| if (READ_ONCE(dev->master)) |
| return false; |
| |
| drm_for_each_crtc(crtc, dev) { |
| if (crtc->primary->fb) |
| crtcs_bound++; |
| if (crtc->primary->fb == fb_helper->fb) |
| bound++; |
| } |
| |
| if (bound < crtcs_bound) |
| return false; |
| |
| return true; |
| } |
| |
| #ifdef CONFIG_MAGIC_SYSRQ |
| /* |
| * restore fbcon display for all kms driver's using this helper, used for sysrq |
| * and panic handling. |
| */ |
| static bool drm_fb_helper_force_kernel_mode(void) |
| { |
| bool ret, error = false; |
| struct drm_fb_helper *helper; |
| |
| if (list_empty(&kernel_fb_helper_list)) |
| return false; |
| |
| list_for_each_entry(helper, &kernel_fb_helper_list, kernel_fb_list) { |
| struct drm_device *dev = helper->dev; |
| |
| if (dev->switch_power_state == DRM_SWITCH_POWER_OFF) |
| continue; |
| |
| drm_modeset_lock_all(dev); |
| ret = restore_fbdev_mode(helper); |
| if (ret) |
| error = true; |
| drm_modeset_unlock_all(dev); |
| } |
| return error; |
| } |
| |
| static void drm_fb_helper_restore_work_fn(struct work_struct *ignored) |
| { |
| bool ret; |
| ret = drm_fb_helper_force_kernel_mode(); |
| if (ret == true) |
| DRM_ERROR("Failed to restore crtc configuration\n"); |
| } |
| static DECLARE_WORK(drm_fb_helper_restore_work, drm_fb_helper_restore_work_fn); |
| |
| static void drm_fb_helper_sysrq(int dummy1) |
| { |
| schedule_work(&drm_fb_helper_restore_work); |
| } |
| |
| static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { |
| .handler = drm_fb_helper_sysrq, |
| .help_msg = "force-fb(V)", |
| .action_msg = "Restore framebuffer console", |
| }; |
| #else |
| static struct sysrq_key_op sysrq_drm_fb_helper_restore_op = { }; |
| #endif |
| |
| static void drm_fb_helper_dpms(struct fb_info *info, int dpms_mode) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_crtc *crtc; |
| struct drm_connector *connector; |
| int i, j; |
| |
| /* |
| * For each CRTC in this fb, turn the connectors on/off. |
| */ |
| drm_modeset_lock_all(dev); |
| if (!drm_fb_helper_is_bound(fb_helper)) { |
| drm_modeset_unlock_all(dev); |
| return; |
| } |
| |
| for (i = 0; i < fb_helper->crtc_count; i++) { |
| crtc = fb_helper->crtc_info[i].mode_set.crtc; |
| |
| if (!crtc->enabled) |
| continue; |
| |
| /* Walk the connectors & encoders on this fb turning them on/off */ |
| drm_fb_helper_for_each_connector(fb_helper, j) { |
| connector = fb_helper->connector_info[j]->connector; |
| connector->funcs->dpms(connector, dpms_mode); |
| drm_object_property_set_value(&connector->base, |
| dev->mode_config.dpms_property, dpms_mode); |
| } |
| } |
| drm_modeset_unlock_all(dev); |
| } |
| |
| /** |
| * drm_fb_helper_blank - implementation for ->fb_blank |
| * @blank: desired blanking state |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_blank(int blank, struct fb_info *info) |
| { |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| switch (blank) { |
| /* Display: On; HSync: On, VSync: On */ |
| case FB_BLANK_UNBLANK: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_ON); |
| break; |
| /* Display: Off; HSync: On, VSync: On */ |
| case FB_BLANK_NORMAL: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); |
| break; |
| /* Display: Off; HSync: Off, VSync: On */ |
| case FB_BLANK_HSYNC_SUSPEND: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_STANDBY); |
| break; |
| /* Display: Off; HSync: On, VSync: Off */ |
| case FB_BLANK_VSYNC_SUSPEND: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_SUSPEND); |
| break; |
| /* Display: Off; HSync: Off, VSync: Off */ |
| case FB_BLANK_POWERDOWN: |
| drm_fb_helper_dpms(info, DRM_MODE_DPMS_OFF); |
| break; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_blank); |
| |
| static void drm_fb_helper_modeset_release(struct drm_fb_helper *helper, |
| struct drm_mode_set *modeset) |
| { |
| int i; |
| |
| for (i = 0; i < modeset->num_connectors; i++) { |
| drm_connector_unreference(modeset->connectors[i]); |
| modeset->connectors[i] = NULL; |
| } |
| modeset->num_connectors = 0; |
| |
| drm_mode_destroy(helper->dev, modeset->mode); |
| modeset->mode = NULL; |
| |
| /* FIXME should hold a ref? */ |
| modeset->fb = NULL; |
| } |
| |
| static void drm_fb_helper_crtc_free(struct drm_fb_helper *helper) |
| { |
| int i; |
| |
| for (i = 0; i < helper->connector_count; i++) { |
| drm_connector_unreference(helper->connector_info[i]->connector); |
| kfree(helper->connector_info[i]); |
| } |
| kfree(helper->connector_info); |
| |
| for (i = 0; i < helper->crtc_count; i++) { |
| struct drm_mode_set *modeset = &helper->crtc_info[i].mode_set; |
| |
| drm_fb_helper_modeset_release(helper, modeset); |
| kfree(modeset->connectors); |
| } |
| kfree(helper->crtc_info); |
| } |
| |
| static void drm_fb_helper_resume_worker(struct work_struct *work) |
| { |
| struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, |
| resume_work); |
| |
| console_lock(); |
| fb_set_suspend(helper->fbdev, 0); |
| console_unlock(); |
| } |
| |
| static void drm_fb_helper_dirty_work(struct work_struct *work) |
| { |
| struct drm_fb_helper *helper = container_of(work, struct drm_fb_helper, |
| dirty_work); |
| struct drm_clip_rect *clip = &helper->dirty_clip; |
| struct drm_clip_rect clip_copy; |
| unsigned long flags; |
| |
| spin_lock_irqsave(&helper->dirty_lock, flags); |
| clip_copy = *clip; |
| clip->x1 = clip->y1 = ~0; |
| clip->x2 = clip->y2 = 0; |
| spin_unlock_irqrestore(&helper->dirty_lock, flags); |
| |
| /* call dirty callback only when it has been really touched */ |
| if (clip_copy.x1 < clip_copy.x2 && clip_copy.y1 < clip_copy.y2) |
| helper->fb->funcs->dirty(helper->fb, NULL, 0, 0, &clip_copy, 1); |
| } |
| |
| /** |
| * drm_fb_helper_prepare - setup a drm_fb_helper structure |
| * @dev: DRM device |
| * @helper: driver-allocated fbdev helper structure to set up |
| * @funcs: pointer to structure of functions associate with this helper |
| * |
| * Sets up the bare minimum to make the framebuffer helper usable. This is |
| * useful to implement race-free initialization of the polling helpers. |
| */ |
| void drm_fb_helper_prepare(struct drm_device *dev, struct drm_fb_helper *helper, |
| const struct drm_fb_helper_funcs *funcs) |
| { |
| INIT_LIST_HEAD(&helper->kernel_fb_list); |
| spin_lock_init(&helper->dirty_lock); |
| INIT_WORK(&helper->resume_work, drm_fb_helper_resume_worker); |
| INIT_WORK(&helper->dirty_work, drm_fb_helper_dirty_work); |
| helper->dirty_clip.x1 = helper->dirty_clip.y1 = ~0; |
| helper->funcs = funcs; |
| helper->dev = dev; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_prepare); |
| |
| /** |
| * drm_fb_helper_init - initialize a drm_fb_helper structure |
| * @dev: drm device |
| * @fb_helper: driver-allocated fbdev helper structure to initialize |
| * @crtc_count: maximum number of crtcs to support in this fbdev emulation |
| * @max_conn_count: max connector count |
| * |
| * This allocates the structures for the fbdev helper with the given limits. |
| * Note that this won't yet touch the hardware (through the driver interfaces) |
| * nor register the fbdev. This is only done in drm_fb_helper_initial_config() |
| * to allow driver writes more control over the exact init sequence. |
| * |
| * Drivers must call drm_fb_helper_prepare() before calling this function. |
| * |
| * RETURNS: |
| * Zero if everything went ok, nonzero otherwise. |
| */ |
| int drm_fb_helper_init(struct drm_device *dev, |
| struct drm_fb_helper *fb_helper, |
| int crtc_count, int max_conn_count) |
| { |
| struct drm_crtc *crtc; |
| int i; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| if (!max_conn_count) |
| return -EINVAL; |
| |
| fb_helper->crtc_info = kcalloc(crtc_count, sizeof(struct drm_fb_helper_crtc), GFP_KERNEL); |
| if (!fb_helper->crtc_info) |
| return -ENOMEM; |
| |
| fb_helper->crtc_count = crtc_count; |
| fb_helper->connector_info = kcalloc(dev->mode_config.num_connector, sizeof(struct drm_fb_helper_connector *), GFP_KERNEL); |
| if (!fb_helper->connector_info) { |
| kfree(fb_helper->crtc_info); |
| return -ENOMEM; |
| } |
| fb_helper->connector_info_alloc_count = dev->mode_config.num_connector; |
| fb_helper->connector_count = 0; |
| |
| for (i = 0; i < crtc_count; i++) { |
| fb_helper->crtc_info[i].mode_set.connectors = |
| kcalloc(max_conn_count, |
| sizeof(struct drm_connector *), |
| GFP_KERNEL); |
| |
| if (!fb_helper->crtc_info[i].mode_set.connectors) |
| goto out_free; |
| fb_helper->crtc_info[i].mode_set.num_connectors = 0; |
| } |
| |
| i = 0; |
| drm_for_each_crtc(crtc, dev) { |
| fb_helper->crtc_info[i].mode_set.crtc = crtc; |
| i++; |
| } |
| |
| return 0; |
| out_free: |
| drm_fb_helper_crtc_free(fb_helper); |
| return -ENOMEM; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_init); |
| |
| /** |
| * drm_fb_helper_alloc_fbi - allocate fb_info and some of its members |
| * @fb_helper: driver-allocated fbdev helper |
| * |
| * A helper to alloc fb_info and the members cmap and apertures. Called |
| * by the driver within the fb_probe fb_helper callback function. |
| * |
| * RETURNS: |
| * fb_info pointer if things went okay, pointer containing error code |
| * otherwise |
| */ |
| struct fb_info *drm_fb_helper_alloc_fbi(struct drm_fb_helper *fb_helper) |
| { |
| struct device *dev = fb_helper->dev->dev; |
| struct fb_info *info; |
| int ret; |
| |
| info = framebuffer_alloc(0, dev); |
| if (!info) |
| return ERR_PTR(-ENOMEM); |
| |
| ret = fb_alloc_cmap(&info->cmap, 256, 0); |
| if (ret) |
| goto err_release; |
| |
| info->apertures = alloc_apertures(1); |
| if (!info->apertures) { |
| ret = -ENOMEM; |
| goto err_free_cmap; |
| } |
| |
| fb_helper->fbdev = info; |
| |
| return info; |
| |
| err_free_cmap: |
| fb_dealloc_cmap(&info->cmap); |
| err_release: |
| framebuffer_release(info); |
| return ERR_PTR(ret); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_alloc_fbi); |
| |
| /** |
| * drm_fb_helper_unregister_fbi - unregister fb_info framebuffer device |
| * @fb_helper: driver-allocated fbdev helper |
| * |
| * A wrapper around unregister_framebuffer, to release the fb_info |
| * framebuffer device |
| */ |
| void drm_fb_helper_unregister_fbi(struct drm_fb_helper *fb_helper) |
| { |
| if (fb_helper && fb_helper->fbdev) |
| unregister_framebuffer(fb_helper->fbdev); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_unregister_fbi); |
| |
| /** |
| * drm_fb_helper_release_fbi - dealloc fb_info and its members |
| * @fb_helper: driver-allocated fbdev helper |
| * |
| * A helper to free memory taken by fb_info and the members cmap and |
| * apertures |
| */ |
| void drm_fb_helper_release_fbi(struct drm_fb_helper *fb_helper) |
| { |
| if (fb_helper) { |
| struct fb_info *info = fb_helper->fbdev; |
| |
| if (info) { |
| if (info->cmap.len) |
| fb_dealloc_cmap(&info->cmap); |
| framebuffer_release(info); |
| } |
| |
| fb_helper->fbdev = NULL; |
| } |
| } |
| EXPORT_SYMBOL(drm_fb_helper_release_fbi); |
| |
| void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) |
| { |
| if (!drm_fbdev_emulation) |
| return; |
| |
| mutex_lock(&kernel_fb_helper_lock); |
| if (!list_empty(&fb_helper->kernel_fb_list)) { |
| list_del(&fb_helper->kernel_fb_list); |
| if (list_empty(&kernel_fb_helper_list)) { |
| unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); |
| } |
| } |
| mutex_unlock(&kernel_fb_helper_lock); |
| |
| drm_fb_helper_crtc_free(fb_helper); |
| |
| } |
| EXPORT_SYMBOL(drm_fb_helper_fini); |
| |
| /** |
| * drm_fb_helper_unlink_fbi - wrapper around unlink_framebuffer |
| * @fb_helper: driver-allocated fbdev helper |
| * |
| * A wrapper around unlink_framebuffer implemented by fbdev core |
| */ |
| void drm_fb_helper_unlink_fbi(struct drm_fb_helper *fb_helper) |
| { |
| if (fb_helper && fb_helper->fbdev) |
| unlink_framebuffer(fb_helper->fbdev); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_unlink_fbi); |
| |
| static void drm_fb_helper_dirty(struct fb_info *info, u32 x, u32 y, |
| u32 width, u32 height) |
| { |
| struct drm_fb_helper *helper = info->par; |
| struct drm_clip_rect *clip = &helper->dirty_clip; |
| unsigned long flags; |
| |
| if (!helper->fb->funcs->dirty) |
| return; |
| |
| spin_lock_irqsave(&helper->dirty_lock, flags); |
| clip->x1 = min_t(u32, clip->x1, x); |
| clip->y1 = min_t(u32, clip->y1, y); |
| clip->x2 = max_t(u32, clip->x2, x + width); |
| clip->y2 = max_t(u32, clip->y2, y + height); |
| spin_unlock_irqrestore(&helper->dirty_lock, flags); |
| |
| schedule_work(&helper->dirty_work); |
| } |
| |
| /** |
| * drm_fb_helper_deferred_io() - fbdev deferred_io callback function |
| * @info: fb_info struct pointer |
| * @pagelist: list of dirty mmap framebuffer pages |
| * |
| * This function is used as the &fb_deferred_io ->deferred_io |
| * callback function for flushing the fbdev mmap writes. |
| */ |
| void drm_fb_helper_deferred_io(struct fb_info *info, |
| struct list_head *pagelist) |
| { |
| unsigned long start, end, min, max; |
| struct page *page; |
| u32 y1, y2; |
| |
| min = ULONG_MAX; |
| max = 0; |
| list_for_each_entry(page, pagelist, lru) { |
| start = page->index << PAGE_SHIFT; |
| end = start + PAGE_SIZE - 1; |
| min = min(min, start); |
| max = max(max, end); |
| } |
| |
| if (min < max) { |
| y1 = min / info->fix.line_length; |
| y2 = min_t(u32, DIV_ROUND_UP(max, info->fix.line_length), |
| info->var.yres); |
| drm_fb_helper_dirty(info, 0, y1, info->var.xres, y2 - y1); |
| } |
| } |
| EXPORT_SYMBOL(drm_fb_helper_deferred_io); |
| |
| /** |
| * drm_fb_helper_sys_read - wrapper around fb_sys_read |
| * @info: fb_info struct pointer |
| * @buf: userspace buffer to read from framebuffer memory |
| * @count: number of bytes to read from framebuffer memory |
| * @ppos: read offset within framebuffer memory |
| * |
| * A wrapper around fb_sys_read implemented by fbdev core |
| */ |
| ssize_t drm_fb_helper_sys_read(struct fb_info *info, char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| return fb_sys_read(info, buf, count, ppos); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_read); |
| |
| /** |
| * drm_fb_helper_sys_write - wrapper around fb_sys_write |
| * @info: fb_info struct pointer |
| * @buf: userspace buffer to write to framebuffer memory |
| * @count: number of bytes to write to framebuffer memory |
| * @ppos: write offset within framebuffer memory |
| * |
| * A wrapper around fb_sys_write implemented by fbdev core |
| */ |
| ssize_t drm_fb_helper_sys_write(struct fb_info *info, const char __user *buf, |
| size_t count, loff_t *ppos) |
| { |
| ssize_t ret; |
| |
| ret = fb_sys_write(info, buf, count, ppos); |
| if (ret > 0) |
| drm_fb_helper_dirty(info, 0, 0, info->var.xres, |
| info->var.yres); |
| |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_write); |
| |
| /** |
| * drm_fb_helper_sys_fillrect - wrapper around sys_fillrect |
| * @info: fbdev registered by the helper |
| * @rect: info about rectangle to fill |
| * |
| * A wrapper around sys_fillrect implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| sys_fillrect(info, rect); |
| drm_fb_helper_dirty(info, rect->dx, rect->dy, |
| rect->width, rect->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_fillrect); |
| |
| /** |
| * drm_fb_helper_sys_copyarea - wrapper around sys_copyarea |
| * @info: fbdev registered by the helper |
| * @area: info about area to copy |
| * |
| * A wrapper around sys_copyarea implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| sys_copyarea(info, area); |
| drm_fb_helper_dirty(info, area->dx, area->dy, |
| area->width, area->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_copyarea); |
| |
| /** |
| * drm_fb_helper_sys_imageblit - wrapper around sys_imageblit |
| * @info: fbdev registered by the helper |
| * @image: info about image to blit |
| * |
| * A wrapper around sys_imageblit implemented by fbdev core |
| */ |
| void drm_fb_helper_sys_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| sys_imageblit(info, image); |
| drm_fb_helper_dirty(info, image->dx, image->dy, |
| image->width, image->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_sys_imageblit); |
| |
| /** |
| * drm_fb_helper_cfb_fillrect - wrapper around cfb_fillrect |
| * @info: fbdev registered by the helper |
| * @rect: info about rectangle to fill |
| * |
| * A wrapper around cfb_imageblit implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_fillrect(struct fb_info *info, |
| const struct fb_fillrect *rect) |
| { |
| cfb_fillrect(info, rect); |
| drm_fb_helper_dirty(info, rect->dx, rect->dy, |
| rect->width, rect->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_fillrect); |
| |
| /** |
| * drm_fb_helper_cfb_copyarea - wrapper around cfb_copyarea |
| * @info: fbdev registered by the helper |
| * @area: info about area to copy |
| * |
| * A wrapper around cfb_copyarea implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_copyarea(struct fb_info *info, |
| const struct fb_copyarea *area) |
| { |
| cfb_copyarea(info, area); |
| drm_fb_helper_dirty(info, area->dx, area->dy, |
| area->width, area->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_copyarea); |
| |
| /** |
| * drm_fb_helper_cfb_imageblit - wrapper around cfb_imageblit |
| * @info: fbdev registered by the helper |
| * @image: info about image to blit |
| * |
| * A wrapper around cfb_imageblit implemented by fbdev core |
| */ |
| void drm_fb_helper_cfb_imageblit(struct fb_info *info, |
| const struct fb_image *image) |
| { |
| cfb_imageblit(info, image); |
| drm_fb_helper_dirty(info, image->dx, image->dy, |
| image->width, image->height); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_cfb_imageblit); |
| |
| /** |
| * drm_fb_helper_set_suspend - wrapper around fb_set_suspend |
| * @fb_helper: driver-allocated fbdev helper |
| * @suspend: whether to suspend or resume |
| * |
| * A wrapper around fb_set_suspend implemented by fbdev core. |
| * Use drm_fb_helper_set_suspend_unlocked() if you don't need to take |
| * the lock yourself |
| */ |
| void drm_fb_helper_set_suspend(struct drm_fb_helper *fb_helper, bool suspend) |
| { |
| if (fb_helper && fb_helper->fbdev) |
| fb_set_suspend(fb_helper->fbdev, suspend); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_suspend); |
| |
| /** |
| * drm_fb_helper_set_suspend_unlocked - wrapper around fb_set_suspend that also |
| * takes the console lock |
| * @fb_helper: driver-allocated fbdev helper |
| * @suspend: whether to suspend or resume |
| * |
| * A wrapper around fb_set_suspend() that takes the console lock. If the lock |
| * isn't available on resume, a worker is tasked with waiting for the lock |
| * to become available. The console lock can be pretty contented on resume |
| * due to all the printk activity. |
| * |
| * This function can be called multiple times with the same state since |
| * &fb_info->state is checked to see if fbdev is running or not before locking. |
| * |
| * Use drm_fb_helper_set_suspend() if you need to take the lock yourself. |
| */ |
| void drm_fb_helper_set_suspend_unlocked(struct drm_fb_helper *fb_helper, |
| bool suspend) |
| { |
| if (!fb_helper || !fb_helper->fbdev) |
| return; |
| |
| /* make sure there's no pending/ongoing resume */ |
| flush_work(&fb_helper->resume_work); |
| |
| if (suspend) { |
| if (fb_helper->fbdev->state != FBINFO_STATE_RUNNING) |
| return; |
| |
| console_lock(); |
| |
| } else { |
| if (fb_helper->fbdev->state == FBINFO_STATE_RUNNING) |
| return; |
| |
| if (!console_trylock()) { |
| schedule_work(&fb_helper->resume_work); |
| return; |
| } |
| } |
| |
| fb_set_suspend(fb_helper->fbdev, suspend); |
| console_unlock(); |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_suspend_unlocked); |
| |
| static int setcolreg(struct drm_crtc *crtc, u16 red, u16 green, |
| u16 blue, u16 regno, struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_framebuffer *fb = fb_helper->fb; |
| |
| if (info->fix.visual == FB_VISUAL_TRUECOLOR) { |
| u32 *palette; |
| u32 value; |
| /* place color in psuedopalette */ |
| if (regno > 16) |
| return -EINVAL; |
| palette = (u32 *)info->pseudo_palette; |
| red >>= (16 - info->var.red.length); |
| green >>= (16 - info->var.green.length); |
| blue >>= (16 - info->var.blue.length); |
| value = (red << info->var.red.offset) | |
| (green << info->var.green.offset) | |
| (blue << info->var.blue.offset); |
| if (info->var.transp.length > 0) { |
| u32 mask = (1 << info->var.transp.length) - 1; |
| mask <<= info->var.transp.offset; |
| value |= mask; |
| } |
| palette[regno] = value; |
| return 0; |
| } |
| |
| /* |
| * The driver really shouldn't advertise pseudo/directcolor |
| * visuals if it can't deal with the palette. |
| */ |
| if (WARN_ON(!fb_helper->funcs->gamma_set || |
| !fb_helper->funcs->gamma_get)) |
| return -EINVAL; |
| |
| WARN_ON(fb->format->cpp[0] != 1); |
| |
| fb_helper->funcs->gamma_set(crtc, red, green, blue, regno); |
| |
| return 0; |
| } |
| |
| /** |
| * drm_fb_helper_setcmap - implementation for ->fb_setcmap |
| * @cmap: cmap to set |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_setcmap(struct fb_cmap *cmap, struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| const struct drm_crtc_helper_funcs *crtc_funcs; |
| u16 *red, *green, *blue, *transp; |
| struct drm_crtc *crtc; |
| int i, j, rc = 0; |
| int start; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| drm_modeset_lock_all(dev); |
| if (!drm_fb_helper_is_bound(fb_helper)) { |
| drm_modeset_unlock_all(dev); |
| return -EBUSY; |
| } |
| |
| for (i = 0; i < fb_helper->crtc_count; i++) { |
| crtc = fb_helper->crtc_info[i].mode_set.crtc; |
| crtc_funcs = crtc->helper_private; |
| |
| red = cmap->red; |
| green = cmap->green; |
| blue = cmap->blue; |
| transp = cmap->transp; |
| start = cmap->start; |
| |
| for (j = 0; j < cmap->len; j++) { |
| u16 hred, hgreen, hblue, htransp = 0xffff; |
| |
| hred = *red++; |
| hgreen = *green++; |
| hblue = *blue++; |
| |
| if (transp) |
| htransp = *transp++; |
| |
| rc = setcolreg(crtc, hred, hgreen, hblue, start++, info); |
| if (rc) |
| goto out; |
| } |
| if (crtc_funcs->load_lut) |
| crtc_funcs->load_lut(crtc); |
| } |
| out: |
| drm_modeset_unlock_all(dev); |
| return rc; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_setcmap); |
| |
| /** |
| * drm_fb_helper_check_var - implementation for ->fb_check_var |
| * @var: screeninfo to check |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_check_var(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_framebuffer *fb = fb_helper->fb; |
| int depth; |
| |
| if (var->pixclock != 0 || in_dbg_master()) |
| return -EINVAL; |
| |
| /* |
| * Changes struct fb_var_screeninfo are currently not pushed back |
| * to KMS, hence fail if different settings are requested. |
| */ |
| if (var->bits_per_pixel != fb->format->cpp[0] * 8 || |
| var->xres != fb->width || var->yres != fb->height || |
| var->xres_virtual != fb->width || var->yres_virtual != fb->height) { |
| DRM_DEBUG("fb userspace requested width/height/bpp different than current fb " |
| "request %dx%d-%d (virtual %dx%d) > %dx%d-%d\n", |
| var->xres, var->yres, var->bits_per_pixel, |
| var->xres_virtual, var->yres_virtual, |
| fb->width, fb->height, fb->format->cpp[0] * 8); |
| return -EINVAL; |
| } |
| |
| switch (var->bits_per_pixel) { |
| case 16: |
| depth = (var->green.length == 6) ? 16 : 15; |
| break; |
| case 32: |
| depth = (var->transp.length > 0) ? 32 : 24; |
| break; |
| default: |
| depth = var->bits_per_pixel; |
| break; |
| } |
| |
| switch (depth) { |
| case 8: |
| var->red.offset = 0; |
| var->green.offset = 0; |
| var->blue.offset = 0; |
| var->red.length = 8; |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.length = 0; |
| var->transp.offset = 0; |
| break; |
| case 15: |
| var->red.offset = 10; |
| var->green.offset = 5; |
| var->blue.offset = 0; |
| var->red.length = 5; |
| var->green.length = 5; |
| var->blue.length = 5; |
| var->transp.length = 1; |
| var->transp.offset = 15; |
| break; |
| case 16: |
| var->red.offset = 11; |
| var->green.offset = 5; |
| var->blue.offset = 0; |
| var->red.length = 5; |
| var->green.length = 6; |
| var->blue.length = 5; |
| var->transp.length = 0; |
| var->transp.offset = 0; |
| break; |
| case 24: |
| var->red.offset = 16; |
| var->green.offset = 8; |
| var->blue.offset = 0; |
| var->red.length = 8; |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.length = 0; |
| var->transp.offset = 0; |
| break; |
| case 32: |
| var->red.offset = 16; |
| var->green.offset = 8; |
| var->blue.offset = 0; |
| var->red.length = 8; |
| var->green.length = 8; |
| var->blue.length = 8; |
| var->transp.length = 8; |
| var->transp.offset = 24; |
| break; |
| default: |
| return -EINVAL; |
| } |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_check_var); |
| |
| /** |
| * drm_fb_helper_set_par - implementation for ->fb_set_par |
| * @info: fbdev registered by the helper |
| * |
| * This will let fbcon do the mode init and is called at initialization time by |
| * the fbdev core when registering the driver, and later on through the hotplug |
| * callback. |
| */ |
| int drm_fb_helper_set_par(struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct fb_var_screeninfo *var = &info->var; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| if (var->pixclock != 0) { |
| DRM_ERROR("PIXEL CLOCK SET\n"); |
| return -EINVAL; |
| } |
| |
| drm_fb_helper_restore_fbdev_mode_unlocked(fb_helper); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_set_par); |
| |
| static int pan_display_atomic(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_atomic_state *state; |
| struct drm_plane *plane; |
| int i, ret; |
| unsigned plane_mask; |
| |
| state = drm_atomic_state_alloc(dev); |
| if (!state) |
| return -ENOMEM; |
| |
| state->acquire_ctx = dev->mode_config.acquire_ctx; |
| retry: |
| plane_mask = 0; |
| for(i = 0; i < fb_helper->crtc_count; i++) { |
| struct drm_mode_set *mode_set; |
| |
| mode_set = &fb_helper->crtc_info[i].mode_set; |
| |
| mode_set->x = var->xoffset; |
| mode_set->y = var->yoffset; |
| |
| ret = __drm_atomic_helper_set_config(mode_set, state); |
| if (ret != 0) |
| goto fail; |
| |
| plane = mode_set->crtc->primary; |
| plane_mask |= (1 << drm_plane_index(plane)); |
| plane->old_fb = plane->fb; |
| } |
| |
| ret = drm_atomic_commit(state); |
| if (ret != 0) |
| goto fail; |
| |
| info->var.xoffset = var->xoffset; |
| info->var.yoffset = var->yoffset; |
| |
| fail: |
| drm_atomic_clean_old_fb(dev, plane_mask, ret); |
| |
| if (ret == -EDEADLK) |
| goto backoff; |
| |
| drm_atomic_state_put(state); |
| return ret; |
| |
| backoff: |
| drm_atomic_state_clear(state); |
| drm_atomic_legacy_backoff(state); |
| |
| goto retry; |
| } |
| |
| /** |
| * drm_fb_helper_pan_display - implementation for ->fb_pan_display |
| * @var: updated screen information |
| * @info: fbdev registered by the helper |
| */ |
| int drm_fb_helper_pan_display(struct fb_var_screeninfo *var, |
| struct fb_info *info) |
| { |
| struct drm_fb_helper *fb_helper = info->par; |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_mode_set *modeset; |
| int ret = 0; |
| int i; |
| |
| if (oops_in_progress) |
| return -EBUSY; |
| |
| drm_modeset_lock_all(dev); |
| if (!drm_fb_helper_is_bound(fb_helper)) { |
| drm_modeset_unlock_all(dev); |
| return -EBUSY; |
| } |
| |
| if (dev->mode_config.funcs->atomic_commit) { |
| ret = pan_display_atomic(var, info); |
| goto unlock; |
| } |
| |
| for (i = 0; i < fb_helper->crtc_count; i++) { |
| modeset = &fb_helper->crtc_info[i].mode_set; |
| |
| modeset->x = var->xoffset; |
| modeset->y = var->yoffset; |
| |
| if (modeset->num_connectors) { |
| ret = drm_mode_set_config_internal(modeset); |
| if (!ret) { |
| info->var.xoffset = var->xoffset; |
| info->var.yoffset = var->yoffset; |
| } |
| } |
| } |
| unlock: |
| drm_modeset_unlock_all(dev); |
| return ret; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_pan_display); |
| |
| /* |
| * Allocates the backing storage and sets up the fbdev info structure through |
| * the ->fb_probe callback and then registers the fbdev and sets up the panic |
| * notifier. |
| */ |
| static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, |
| int preferred_bpp) |
| { |
| int ret = 0; |
| int crtc_count = 0; |
| int i; |
| struct drm_fb_helper_surface_size sizes; |
| int gamma_size = 0; |
| |
| memset(&sizes, 0, sizeof(struct drm_fb_helper_surface_size)); |
| sizes.surface_depth = 24; |
| sizes.surface_bpp = 32; |
| sizes.fb_width = (unsigned)-1; |
| sizes.fb_height = (unsigned)-1; |
| |
| /* if driver picks 8 or 16 by default use that |
| for both depth/bpp */ |
| if (preferred_bpp != sizes.surface_bpp) |
| sizes.surface_depth = sizes.surface_bpp = preferred_bpp; |
| |
| /* first up get a count of crtcs now in use and new min/maxes width/heights */ |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| struct drm_fb_helper_connector *fb_helper_conn = fb_helper->connector_info[i]; |
| struct drm_cmdline_mode *cmdline_mode; |
| |
| cmdline_mode = &fb_helper_conn->connector->cmdline_mode; |
| |
| if (cmdline_mode->bpp_specified) { |
| switch (cmdline_mode->bpp) { |
| case 8: |
| sizes.surface_depth = sizes.surface_bpp = 8; |
| break; |
| case 15: |
| sizes.surface_depth = 15; |
| sizes.surface_bpp = 16; |
| break; |
| case 16: |
| sizes.surface_depth = sizes.surface_bpp = 16; |
| break; |
| case 24: |
| sizes.surface_depth = sizes.surface_bpp = 24; |
| break; |
| case 32: |
| sizes.surface_depth = 24; |
| sizes.surface_bpp = 32; |
| break; |
| } |
| break; |
| } |
| } |
| |
| crtc_count = 0; |
| for (i = 0; i < fb_helper->crtc_count; i++) { |
| struct drm_display_mode *desired_mode; |
| struct drm_mode_set *mode_set; |
| int x, y, j; |
| /* in case of tile group, are we the last tile vert or horiz? |
| * If no tile group you are always the last one both vertically |
| * and horizontally |
| */ |
| bool lastv = true, lasth = true; |
| |
| desired_mode = fb_helper->crtc_info[i].desired_mode; |
| mode_set = &fb_helper->crtc_info[i].mode_set; |
| |
| if (!desired_mode) |
| continue; |
| |
| crtc_count++; |
| |
| x = fb_helper->crtc_info[i].x; |
| y = fb_helper->crtc_info[i].y; |
| |
| if (gamma_size == 0) |
| gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; |
| |
| sizes.surface_width = max_t(u32, desired_mode->hdisplay + x, sizes.surface_width); |
| sizes.surface_height = max_t(u32, desired_mode->vdisplay + y, sizes.surface_height); |
| |
| for (j = 0; j < mode_set->num_connectors; j++) { |
| struct drm_connector *connector = mode_set->connectors[j]; |
| if (connector->has_tile) { |
| lasth = (connector->tile_h_loc == (connector->num_h_tile - 1)); |
| lastv = (connector->tile_v_loc == (connector->num_v_tile - 1)); |
| /* cloning to multiple tiles is just crazy-talk, so: */ |
| break; |
| } |
| } |
| |
| if (lasth) |
| sizes.fb_width = min_t(u32, desired_mode->hdisplay + x, sizes.fb_width); |
| if (lastv) |
| sizes.fb_height = min_t(u32, desired_mode->vdisplay + y, sizes.fb_height); |
| } |
| |
| if (crtc_count == 0 || sizes.fb_width == -1 || sizes.fb_height == -1) { |
| /* hmm everyone went away - assume VGA cable just fell out |
| and will come back later. */ |
| DRM_INFO("Cannot find any crtc or sizes - going 1024x768\n"); |
| sizes.fb_width = sizes.surface_width = 1024; |
| sizes.fb_height = sizes.surface_height = 768; |
| } |
| |
| /* push down into drivers */ |
| ret = (*fb_helper->funcs->fb_probe)(fb_helper, &sizes); |
| if (ret < 0) |
| return ret; |
| |
| /* |
| * Set the fb pointer - usually drm_setup_crtcs does this for hotplug |
| * events, but at init time drm_setup_crtcs needs to be called before |
| * the fb is allocated (since we need to figure out the desired size of |
| * the fb before we can allocate it ...). Hence we need to fix things up |
| * here again. |
| */ |
| for (i = 0; i < fb_helper->crtc_count; i++) |
| if (fb_helper->crtc_info[i].mode_set.num_connectors) |
| fb_helper->crtc_info[i].mode_set.fb = fb_helper->fb; |
| |
| return 0; |
| } |
| |
| /** |
| * drm_fb_helper_fill_fix - initializes fixed fbdev information |
| * @info: fbdev registered by the helper |
| * @pitch: desired pitch |
| * @depth: desired depth |
| * |
| * Helper to fill in the fixed fbdev information useful for a non-accelerated |
| * fbdev emulations. Drivers which support acceleration methods which impose |
| * additional constraints need to set up their own limits. |
| * |
| * Drivers should call this (or their equivalent setup code) from their |
| * ->fb_probe callback. |
| */ |
| void drm_fb_helper_fill_fix(struct fb_info *info, uint32_t pitch, |
| uint32_t depth) |
| { |
| info->fix.type = FB_TYPE_PACKED_PIXELS; |
| info->fix.visual = depth == 8 ? FB_VISUAL_PSEUDOCOLOR : |
| FB_VISUAL_TRUECOLOR; |
| info->fix.mmio_start = 0; |
| info->fix.mmio_len = 0; |
| info->fix.type_aux = 0; |
| info->fix.xpanstep = 1; /* doing it in hw */ |
| info->fix.ypanstep = 1; /* doing it in hw */ |
| info->fix.ywrapstep = 0; |
| info->fix.accel = FB_ACCEL_NONE; |
| |
| info->fix.line_length = pitch; |
| return; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_fill_fix); |
| |
| /** |
| * drm_fb_helper_fill_var - initalizes variable fbdev information |
| * @info: fbdev instance to set up |
| * @fb_helper: fb helper instance to use as template |
| * @fb_width: desired fb width |
| * @fb_height: desired fb height |
| * |
| * Sets up the variable fbdev metainformation from the given fb helper instance |
| * and the drm framebuffer allocated in fb_helper->fb. |
| * |
| * Drivers should call this (or their equivalent setup code) from their |
| * ->fb_probe callback after having allocated the fbdev backing |
| * storage framebuffer. |
| */ |
| void drm_fb_helper_fill_var(struct fb_info *info, struct drm_fb_helper *fb_helper, |
| uint32_t fb_width, uint32_t fb_height) |
| { |
| struct drm_framebuffer *fb = fb_helper->fb; |
| info->pseudo_palette = fb_helper->pseudo_palette; |
| info->var.xres_virtual = fb->width; |
| info->var.yres_virtual = fb->height; |
| info->var.bits_per_pixel = fb->format->cpp[0] * 8; |
| info->var.accel_flags = FB_ACCELF_TEXT; |
| info->var.xoffset = 0; |
| info->var.yoffset = 0; |
| info->var.activate = FB_ACTIVATE_NOW; |
| info->var.height = -1; |
| info->var.width = -1; |
| |
| switch (fb->format->depth) { |
| case 8: |
| info->var.red.offset = 0; |
| info->var.green.offset = 0; |
| info->var.blue.offset = 0; |
| info->var.red.length = 8; /* 8bit DAC */ |
| info->var.green.length = 8; |
| info->var.blue.length = 8; |
| info->var.transp.offset = 0; |
| info->var.transp.length = 0; |
| break; |
| case 15: |
| info->var.red.offset = 10; |
| info->var.green.offset = 5; |
| info->var.blue.offset = 0; |
| info->var.red.length = 5; |
| info->var.green.length = 5; |
| info->var.blue.length = 5; |
| info->var.transp.offset = 15; |
| info->var.transp.length = 1; |
| break; |
| case 16: |
| info->var.red.offset = 11; |
| info->var.green.offset = 5; |
| info->var.blue.offset = 0; |
| info->var.red.length = 5; |
| info->var.green.length = 6; |
| info->var.blue.length = 5; |
| info->var.transp.offset = 0; |
| break; |
| case 24: |
| info->var.red.offset = 16; |
| info->var.green.offset = 8; |
| info->var.blue.offset = 0; |
| info->var.red.length = 8; |
| info->var.green.length = 8; |
| info->var.blue.length = 8; |
| info->var.transp.offset = 0; |
| info->var.transp.length = 0; |
| break; |
| case 32: |
| info->var.red.offset = 16; |
| info->var.green.offset = 8; |
| info->var.blue.offset = 0; |
| info->var.red.length = 8; |
| info->var.green.length = 8; |
| info->var.blue.length = 8; |
| info->var.transp.offset = 24; |
| info->var.transp.length = 8; |
| break; |
| default: |
| break; |
| } |
| |
| info->var.xres = fb_width; |
| info->var.yres = fb_height; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_fill_var); |
| |
| static int drm_fb_helper_probe_connector_modes(struct drm_fb_helper *fb_helper, |
| uint32_t maxX, |
| uint32_t maxY) |
| { |
| struct drm_connector *connector; |
| int count = 0; |
| int i; |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| connector = fb_helper->connector_info[i]->connector; |
| count += connector->funcs->fill_modes(connector, maxX, maxY); |
| } |
| |
| return count; |
| } |
| |
| struct drm_display_mode *drm_has_preferred_mode(struct drm_fb_helper_connector *fb_connector, int width, int height) |
| { |
| struct drm_display_mode *mode; |
| |
| list_for_each_entry(mode, &fb_connector->connector->modes, head) { |
| if (mode->hdisplay > width || |
| mode->vdisplay > height) |
| continue; |
| if (mode->type & DRM_MODE_TYPE_PREFERRED) |
| return mode; |
| } |
| return NULL; |
| } |
| EXPORT_SYMBOL(drm_has_preferred_mode); |
| |
| static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) |
| { |
| return fb_connector->connector->cmdline_mode.specified; |
| } |
| |
| struct drm_display_mode *drm_pick_cmdline_mode(struct drm_fb_helper_connector *fb_helper_conn, |
| int width, int height) |
| { |
| struct drm_cmdline_mode *cmdline_mode; |
| struct drm_display_mode *mode; |
| bool prefer_non_interlace; |
| |
| cmdline_mode = &fb_helper_conn->connector->cmdline_mode; |
| if (cmdline_mode->specified == false) |
| return NULL; |
| |
| /* attempt to find a matching mode in the list of modes |
| * we have gotten so far, if not add a CVT mode that conforms |
| */ |
| if (cmdline_mode->rb || cmdline_mode->margins) |
| goto create_mode; |
| |
| prefer_non_interlace = !cmdline_mode->interlace; |
| again: |
| list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { |
| /* check width/height */ |
| if (mode->hdisplay != cmdline_mode->xres || |
| mode->vdisplay != cmdline_mode->yres) |
| continue; |
| |
| if (cmdline_mode->refresh_specified) { |
| if (mode->vrefresh != cmdline_mode->refresh) |
| continue; |
| } |
| |
| if (cmdline_mode->interlace) { |
| if (!(mode->flags & DRM_MODE_FLAG_INTERLACE)) |
| continue; |
| } else if (prefer_non_interlace) { |
| if (mode->flags & DRM_MODE_FLAG_INTERLACE) |
| continue; |
| } |
| return mode; |
| } |
| |
| if (prefer_non_interlace) { |
| prefer_non_interlace = false; |
| goto again; |
| } |
| |
| create_mode: |
| mode = drm_mode_create_from_cmdline_mode(fb_helper_conn->connector->dev, |
| cmdline_mode); |
| list_add(&mode->head, &fb_helper_conn->connector->modes); |
| return mode; |
| } |
| EXPORT_SYMBOL(drm_pick_cmdline_mode); |
| |
| static bool drm_connector_enabled(struct drm_connector *connector, bool strict) |
| { |
| bool enable; |
| |
| if (strict) |
| enable = connector->status == connector_status_connected; |
| else |
| enable = connector->status != connector_status_disconnected; |
| |
| return enable; |
| } |
| |
| static void drm_enable_connectors(struct drm_fb_helper *fb_helper, |
| bool *enabled) |
| { |
| bool any_enabled = false; |
| struct drm_connector *connector; |
| int i = 0; |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| connector = fb_helper->connector_info[i]->connector; |
| enabled[i] = drm_connector_enabled(connector, true); |
| DRM_DEBUG_KMS("connector %d enabled? %s\n", connector->base.id, |
| enabled[i] ? "yes" : "no"); |
| any_enabled |= enabled[i]; |
| } |
| |
| if (any_enabled) |
| return; |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| connector = fb_helper->connector_info[i]->connector; |
| enabled[i] = drm_connector_enabled(connector, false); |
| } |
| } |
| |
| static bool drm_target_cloned(struct drm_fb_helper *fb_helper, |
| struct drm_display_mode **modes, |
| struct drm_fb_offset *offsets, |
| bool *enabled, int width, int height) |
| { |
| int count, i, j; |
| bool can_clone = false; |
| struct drm_fb_helper_connector *fb_helper_conn; |
| struct drm_display_mode *dmt_mode, *mode; |
| |
| /* only contemplate cloning in the single crtc case */ |
| if (fb_helper->crtc_count > 1) |
| return false; |
| |
| count = 0; |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| if (enabled[i]) |
| count++; |
| } |
| |
| /* only contemplate cloning if more than one connector is enabled */ |
| if (count <= 1) |
| return false; |
| |
| /* check the command line or if nothing common pick 1024x768 */ |
| can_clone = true; |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| if (!enabled[i]) |
| continue; |
| fb_helper_conn = fb_helper->connector_info[i]; |
| modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); |
| if (!modes[i]) { |
| can_clone = false; |
| break; |
| } |
| for (j = 0; j < i; j++) { |
| if (!enabled[j]) |
| continue; |
| if (!drm_mode_equal(modes[j], modes[i])) |
| can_clone = false; |
| } |
| } |
| |
| if (can_clone) { |
| DRM_DEBUG_KMS("can clone using command line\n"); |
| return true; |
| } |
| |
| /* try and find a 1024x768 mode on each connector */ |
| can_clone = true; |
| dmt_mode = drm_mode_find_dmt(fb_helper->dev, 1024, 768, 60, false); |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| if (!enabled[i]) |
| continue; |
| |
| fb_helper_conn = fb_helper->connector_info[i]; |
| list_for_each_entry(mode, &fb_helper_conn->connector->modes, head) { |
| if (drm_mode_equal(mode, dmt_mode)) |
| modes[i] = mode; |
| } |
| if (!modes[i]) |
| can_clone = false; |
| } |
| |
| if (can_clone) { |
| DRM_DEBUG_KMS("can clone using 1024x768\n"); |
| return true; |
| } |
| DRM_INFO("kms: can't enable cloning when we probably wanted to.\n"); |
| return false; |
| } |
| |
| static int drm_get_tile_offsets(struct drm_fb_helper *fb_helper, |
| struct drm_display_mode **modes, |
| struct drm_fb_offset *offsets, |
| int idx, |
| int h_idx, int v_idx) |
| { |
| struct drm_fb_helper_connector *fb_helper_conn; |
| int i; |
| int hoffset = 0, voffset = 0; |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| fb_helper_conn = fb_helper->connector_info[i]; |
| if (!fb_helper_conn->connector->has_tile) |
| continue; |
| |
| if (!modes[i] && (h_idx || v_idx)) { |
| DRM_DEBUG_KMS("no modes for connector tiled %d %d\n", i, |
| fb_helper_conn->connector->base.id); |
| continue; |
| } |
| if (fb_helper_conn->connector->tile_h_loc < h_idx) |
| hoffset += modes[i]->hdisplay; |
| |
| if (fb_helper_conn->connector->tile_v_loc < v_idx) |
| voffset += modes[i]->vdisplay; |
| } |
| offsets[idx].x = hoffset; |
| offsets[idx].y = voffset; |
| DRM_DEBUG_KMS("returned %d %d for %d %d\n", hoffset, voffset, h_idx, v_idx); |
| return 0; |
| } |
| |
| static bool drm_target_preferred(struct drm_fb_helper *fb_helper, |
| struct drm_display_mode **modes, |
| struct drm_fb_offset *offsets, |
| bool *enabled, int width, int height) |
| { |
| struct drm_fb_helper_connector *fb_helper_conn; |
| const u64 mask = BIT_ULL(fb_helper->connector_count) - 1; |
| u64 conn_configured = 0; |
| int tile_pass = 0; |
| int i; |
| |
| retry: |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| fb_helper_conn = fb_helper->connector_info[i]; |
| |
| if (conn_configured & BIT_ULL(i)) |
| continue; |
| |
| if (enabled[i] == false) { |
| conn_configured |= BIT_ULL(i); |
| continue; |
| } |
| |
| /* first pass over all the untiled connectors */ |
| if (tile_pass == 0 && fb_helper_conn->connector->has_tile) |
| continue; |
| |
| if (tile_pass == 1) { |
| if (fb_helper_conn->connector->tile_h_loc != 0 || |
| fb_helper_conn->connector->tile_v_loc != 0) |
| continue; |
| |
| } else { |
| if (fb_helper_conn->connector->tile_h_loc != tile_pass -1 && |
| fb_helper_conn->connector->tile_v_loc != tile_pass - 1) |
| /* if this tile_pass doesn't cover any of the tiles - keep going */ |
| continue; |
| |
| /* find the tile offsets for this pass - need |
| to find all tiles left and above */ |
| drm_get_tile_offsets(fb_helper, modes, offsets, |
| i, fb_helper_conn->connector->tile_h_loc, fb_helper_conn->connector->tile_v_loc); |
| } |
| DRM_DEBUG_KMS("looking for cmdline mode on connector %d\n", |
| fb_helper_conn->connector->base.id); |
| |
| /* got for command line mode first */ |
| modes[i] = drm_pick_cmdline_mode(fb_helper_conn, width, height); |
| if (!modes[i]) { |
| DRM_DEBUG_KMS("looking for preferred mode on connector %d %d\n", |
| fb_helper_conn->connector->base.id, fb_helper_conn->connector->tile_group ? fb_helper_conn->connector->tile_group->id : 0); |
| modes[i] = drm_has_preferred_mode(fb_helper_conn, width, height); |
| } |
| /* No preferred modes, pick one off the list */ |
| if (!modes[i] && !list_empty(&fb_helper_conn->connector->modes)) { |
| list_for_each_entry(modes[i], &fb_helper_conn->connector->modes, head) |
| break; |
| } |
| DRM_DEBUG_KMS("found mode %s\n", modes[i] ? modes[i]->name : |
| "none"); |
| conn_configured |= BIT_ULL(i); |
| } |
| |
| if ((conn_configured & mask) != mask) { |
| tile_pass++; |
| goto retry; |
| } |
| return true; |
| } |
| |
| static int drm_pick_crtcs(struct drm_fb_helper *fb_helper, |
| struct drm_fb_helper_crtc **best_crtcs, |
| struct drm_display_mode **modes, |
| int n, int width, int height) |
| { |
| int c, o; |
| struct drm_connector *connector; |
| const struct drm_connector_helper_funcs *connector_funcs; |
| struct drm_encoder *encoder; |
| int my_score, best_score, score; |
| struct drm_fb_helper_crtc **crtcs, *crtc; |
| struct drm_fb_helper_connector *fb_helper_conn; |
| |
| if (n == fb_helper->connector_count) |
| return 0; |
| |
| fb_helper_conn = fb_helper->connector_info[n]; |
| connector = fb_helper_conn->connector; |
| |
| best_crtcs[n] = NULL; |
| best_score = drm_pick_crtcs(fb_helper, best_crtcs, modes, n+1, width, height); |
| if (modes[n] == NULL) |
| return best_score; |
| |
| crtcs = kzalloc(fb_helper->connector_count * |
| sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); |
| if (!crtcs) |
| return best_score; |
| |
| my_score = 1; |
| if (connector->status == connector_status_connected) |
| my_score++; |
| if (drm_has_cmdline_mode(fb_helper_conn)) |
| my_score++; |
| if (drm_has_preferred_mode(fb_helper_conn, width, height)) |
| my_score++; |
| |
| connector_funcs = connector->helper_private; |
| |
| /* |
| * If the DRM device implements atomic hooks and ->best_encoder() is |
| * NULL we fallback to the default drm_atomic_helper_best_encoder() |
| * helper. |
| */ |
| if (fb_helper->dev->mode_config.funcs->atomic_commit && |
| !connector_funcs->best_encoder) |
| encoder = drm_atomic_helper_best_encoder(connector); |
| else |
| encoder = connector_funcs->best_encoder(connector); |
| |
| if (!encoder) |
| goto out; |
| |
| /* select a crtc for this connector and then attempt to configure |
| remaining connectors */ |
| for (c = 0; c < fb_helper->crtc_count; c++) { |
| crtc = &fb_helper->crtc_info[c]; |
| |
| if ((encoder->possible_crtcs & (1 << c)) == 0) |
| continue; |
| |
| for (o = 0; o < n; o++) |
| if (best_crtcs[o] == crtc) |
| break; |
| |
| if (o < n) { |
| /* ignore cloning unless only a single crtc */ |
| if (fb_helper->crtc_count > 1) |
| continue; |
| |
| if (!drm_mode_equal(modes[o], modes[n])) |
| continue; |
| } |
| |
| crtcs[n] = crtc; |
| memcpy(crtcs, best_crtcs, n * sizeof(struct drm_fb_helper_crtc *)); |
| score = my_score + drm_pick_crtcs(fb_helper, crtcs, modes, n + 1, |
| width, height); |
| if (score > best_score) { |
| best_score = score; |
| memcpy(best_crtcs, crtcs, |
| fb_helper->connector_count * |
| sizeof(struct drm_fb_helper_crtc *)); |
| } |
| } |
| out: |
| kfree(crtcs); |
| return best_score; |
| } |
| |
| static void drm_setup_crtcs(struct drm_fb_helper *fb_helper, |
| u32 width, u32 height) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct drm_fb_helper_crtc **crtcs; |
| struct drm_display_mode **modes; |
| struct drm_fb_offset *offsets; |
| bool *enabled; |
| int i; |
| |
| DRM_DEBUG_KMS("\n"); |
| if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0) |
| DRM_DEBUG_KMS("No connectors reported connected with modes\n"); |
| |
| /* prevent concurrent modification of connector_count by hotplug */ |
| lockdep_assert_held(&fb_helper->dev->mode_config.mutex); |
| |
| crtcs = kcalloc(fb_helper->connector_count, |
| sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); |
| modes = kcalloc(fb_helper->connector_count, |
| sizeof(struct drm_display_mode *), GFP_KERNEL); |
| offsets = kcalloc(fb_helper->connector_count, |
| sizeof(struct drm_fb_offset), GFP_KERNEL); |
| enabled = kcalloc(fb_helper->connector_count, |
| sizeof(bool), GFP_KERNEL); |
| if (!crtcs || !modes || !enabled || !offsets) { |
| DRM_ERROR("Memory allocation failed\n"); |
| goto out; |
| } |
| |
| drm_enable_connectors(fb_helper, enabled); |
| |
| if (!(fb_helper->funcs->initial_config && |
| fb_helper->funcs->initial_config(fb_helper, crtcs, modes, |
| offsets, |
| enabled, width, height))) { |
| memset(modes, 0, fb_helper->connector_count*sizeof(modes[0])); |
| memset(crtcs, 0, fb_helper->connector_count*sizeof(crtcs[0])); |
| memset(offsets, 0, fb_helper->connector_count*sizeof(offsets[0])); |
| |
| if (!drm_target_cloned(fb_helper, modes, offsets, |
| enabled, width, height) && |
| !drm_target_preferred(fb_helper, modes, offsets, |
| enabled, width, height)) |
| DRM_ERROR("Unable to find initial modes\n"); |
| |
| DRM_DEBUG_KMS("picking CRTCs for %dx%d config\n", |
| width, height); |
| |
| drm_pick_crtcs(fb_helper, crtcs, modes, 0, width, height); |
| } |
| |
| /* need to set the modesets up here for use later */ |
| /* fill out the connector<->crtc mappings into the modesets */ |
| for (i = 0; i < fb_helper->crtc_count; i++) |
| drm_fb_helper_modeset_release(fb_helper, |
| &fb_helper->crtc_info[i].mode_set); |
| |
| drm_fb_helper_for_each_connector(fb_helper, i) { |
| struct drm_display_mode *mode = modes[i]; |
| struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; |
| struct drm_fb_offset *offset = &offsets[i]; |
| struct drm_mode_set *modeset = &fb_crtc->mode_set; |
| |
| if (mode && fb_crtc) { |
| struct drm_connector *connector = |
| fb_helper->connector_info[i]->connector; |
| |
| DRM_DEBUG_KMS("desired mode %s set on crtc %d (%d,%d)\n", |
| mode->name, fb_crtc->mode_set.crtc->base.id, offset->x, offset->y); |
| |
| fb_crtc->desired_mode = mode; |
| fb_crtc->x = offset->x; |
| fb_crtc->y = offset->y; |
| modeset->mode = drm_mode_duplicate(dev, |
| fb_crtc->desired_mode); |
| drm_connector_reference(connector); |
| modeset->connectors[modeset->num_connectors++] = connector; |
| modeset->fb = fb_helper->fb; |
| modeset->x = offset->x; |
| modeset->y = offset->y; |
| } |
| } |
| out: |
| kfree(crtcs); |
| kfree(modes); |
| kfree(offsets); |
| kfree(enabled); |
| } |
| |
| /** |
| * drm_fb_helper_initial_config - setup a sane initial connector configuration |
| * @fb_helper: fb_helper device struct |
| * @bpp_sel: bpp value to use for the framebuffer configuration |
| * |
| * Scans the CRTCs and connectors and tries to put together an initial setup. |
| * At the moment, this is a cloned configuration across all heads with |
| * a new framebuffer object as the backing store. |
| * |
| * Note that this also registers the fbdev and so allows userspace to call into |
| * the driver through the fbdev interfaces. |
| * |
| * This function will call down into the ->fb_probe callback to let |
| * the driver allocate and initialize the fbdev info structure and the drm |
| * framebuffer used to back the fbdev. drm_fb_helper_fill_var() and |
| * drm_fb_helper_fill_fix() are provided as helpers to setup simple default |
| * values for the fbdev info structure. |
| * |
| * HANG DEBUGGING: |
| * |
| * When you have fbcon support built-in or already loaded, this function will do |
| * a full modeset to setup the fbdev console. Due to locking misdesign in the |
| * VT/fbdev subsystem that entire modeset sequence has to be done while holding |
| * console_lock. Until console_unlock is called no dmesg lines will be sent out |
| * to consoles, not even serial console. This means when your driver crashes, |
| * you will see absolutely nothing else but a system stuck in this function, |
| * with no further output. Any kind of printk() you place within your own driver |
| * or in the drm core modeset code will also never show up. |
| * |
| * Standard debug practice is to run the fbcon setup without taking the |
| * console_lock as a hack, to be able to see backtraces and crashes on the |
| * serial line. This can be done by setting the fb.lockless_register_fb=1 kernel |
| * cmdline option. |
| * |
| * The other option is to just disable fbdev emulation since very likely the |
| * first modeset from userspace will crash in the same way, and is even easier |
| * to debug. This can be done by setting the drm_kms_helper.fbdev_emulation=0 |
| * kernel cmdline option. |
| * |
| * RETURNS: |
| * Zero if everything went ok, nonzero otherwise. |
| */ |
| int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| struct fb_info *info; |
| int ret; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| mutex_lock(&dev->mode_config.mutex); |
| drm_setup_crtcs(fb_helper, |
| dev->mode_config.max_width, |
| dev->mode_config.max_height); |
| ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); |
| mutex_unlock(&dev->mode_config.mutex); |
| if (ret) |
| return ret; |
| |
| info = fb_helper->fbdev; |
| info->var.pixclock = 0; |
| ret = register_framebuffer(info); |
| if (ret < 0) |
| return ret; |
| |
| dev_info(dev->dev, "fb%d: %s frame buffer device\n", |
| info->node, info->fix.id); |
| |
| mutex_lock(&kernel_fb_helper_lock); |
| if (list_empty(&kernel_fb_helper_list)) |
| register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); |
| |
| list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); |
| mutex_unlock(&kernel_fb_helper_lock); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_initial_config); |
| |
| /** |
| * drm_fb_helper_hotplug_event - respond to a hotplug notification by |
| * probing all the outputs attached to the fb |
| * @fb_helper: the drm_fb_helper |
| * |
| * Scan the connectors attached to the fb_helper and try to put together a |
| * setup after notification of a change in output configuration. |
| * |
| * Called at runtime, takes the mode config locks to be able to check/change the |
| * modeset configuration. Must be run from process context (which usually means |
| * either the output polling work or a work item launched from the driver's |
| * hotplug interrupt). |
| * |
| * Note that drivers may call this even before calling |
| * drm_fb_helper_initial_config but only after drm_fb_helper_init. This allows |
| * for a race-free fbcon setup and will make sure that the fbdev emulation will |
| * not miss any hotplug events. |
| * |
| * RETURNS: |
| * 0 on success and a non-zero error code otherwise. |
| */ |
| int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) |
| { |
| struct drm_device *dev = fb_helper->dev; |
| |
| if (!drm_fbdev_emulation) |
| return 0; |
| |
| mutex_lock(&dev->mode_config.mutex); |
| if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { |
| fb_helper->delayed_hotplug = true; |
| mutex_unlock(&dev->mode_config.mutex); |
| return 0; |
| } |
| DRM_DEBUG_KMS("\n"); |
| |
| drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height); |
| |
| mutex_unlock(&dev->mode_config.mutex); |
| |
| drm_fb_helper_set_par(fb_helper->fbdev); |
| |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_hotplug_event); |
| |
| /* The Kconfig DRM_KMS_HELPER selects FRAMEBUFFER_CONSOLE (if !EXPERT) |
| * but the module doesn't depend on any fb console symbols. At least |
| * attempt to load fbcon to avoid leaving the system without a usable console. |
| */ |
| int __init drm_fb_helper_modinit(void) |
| { |
| #if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) |
| const char *name = "fbcon"; |
| struct module *fbcon; |
| |
| mutex_lock(&module_mutex); |
| fbcon = find_module(name); |
| mutex_unlock(&module_mutex); |
| |
| if (!fbcon) |
| request_module_nowait(name); |
| #endif |
| return 0; |
| } |
| EXPORT_SYMBOL(drm_fb_helper_modinit); |