diff options
Diffstat (limited to 'kernel/drivers/gpu/drm/drm_fb_helper.c')
| -rw-r--r-- | kernel/drivers/gpu/drm/drm_fb_helper.c | 1838 |
1 files changed, 1838 insertions, 0 deletions
diff --git a/kernel/drivers/gpu/drm/drm_fb_helper.c b/kernel/drivers/gpu/drm/drm_fb_helper.c new file mode 100644 index 000000000..cac422916 --- /dev/null +++ b/kernel/drivers/gpu/drm/drm_fb_helper.c @@ -0,0 +1,1838 @@ +/* + * 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/kernel.h> +#include <linux/sysrq.h> +#include <linux/slab.h> +#include <linux/fb.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> + +static LIST_HEAD(kernel_fb_helper_list); + +/** + * 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() 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(). + */ + +/** + * 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. + * + * Since this is part of the initial setup before the fbdev is published, no + * locking is required. + */ +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; + + list_for_each_entry(connector, &dev->mode_config.connector_list, head) { + struct drm_fb_helper_connector *fb_helper_connector; + + fb_helper_connector = kzalloc(sizeof(struct drm_fb_helper_connector), GFP_KERNEL); + if (!fb_helper_connector) + goto fail; + + fb_helper_connector->connector = connector; + fb_helper->connector_info[fb_helper->connector_count++] = fb_helper_connector; + } + return 0; +fail: + for (i = 0; i < fb_helper->connector_count; i++) { + kfree(fb_helper->connector_info[i]); + fb_helper->connector_info[i] = NULL; + } + fb_helper->connector_count = 0; + return -ENOMEM; +} +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; + + 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; + + 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); + +static void remove_from_modeset(struct drm_mode_set *set, + struct drm_connector *connector) +{ + int i, j; + + for (i = 0; i < set->num_connectors; i++) { + if (set->connectors[i] == connector) + break; + } + + if (i == set->num_connectors) + return; + + for (j = i + 1; j < set->num_connectors; j++) { + set->connectors[j - 1] = set->connectors[j]; + } + set->num_connectors--; + + /* because i915 is pissy about this.. + * TODO maybe need to makes sure we set it back to !=NULL somewhere? + */ + if (set->num_connectors == 0) + set->fb = NULL; +} + +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; + + 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]; + + 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); + + /* also cleanup dangling references to the connector: */ + for (i = 0; i < fb_helper->crtc_count; i++) + remove_from_modeset(&fb_helper->crtc_info[i].mode_set, 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, 0, 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; + 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; + + list_for_each_entry(c, &dev->mode_config.crtc_list, head) { + 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; + } + + 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 bool restore_fbdev_mode(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_plane *plane; + bool error = false; + int i; + + drm_warn_on_modeset_not_all_locked(dev); + + list_for_each_entry(plane, &dev->mode_config.plane_list, head) { + if (plane->type != DRM_PLANE_TYPE_PRIMARY) + drm_plane_force_disable(plane); + + if (dev->mode_config.rotation_property) { + drm_mode_plane_set_obj_prop(plane, + dev->mode_config.rotation_property, + BIT(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_set) { + ret = crtc->funcs->cursor_set(crtc, NULL, 0, 0, 0); + if (ret) + error = true; + } + + ret = drm_mode_set_config_internal(mode_set); + if (ret) + error = true; + } + return error; +} +/** + * drm_fb_helper_restore_fbdev_mode - 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. + * + * Use this variant if you need to bypass locking (panic), or already + * hold all modeset locks. Otherwise use drm_fb_helper_restore_fbdev_mode_unlocked() + */ +static bool drm_fb_helper_restore_fbdev_mode(struct drm_fb_helper *fb_helper) +{ + return restore_fbdev_mode(fb_helper); +} + +/** + * 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. + */ +bool drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + bool ret; + bool do_delayed = false; + + 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); + +/* + * 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; + + /* + * NOTE: Use trylock mode to avoid deadlocks and sleeping in + * panic context. + */ + if (__drm_modeset_lock_all(dev, true) != 0) { + error = true; + continue; + } + + ret = drm_fb_helper_restore_fbdev_mode(helper); + if (ret) + error = true; + + drm_modeset_unlock_all(dev); + } + return error; +} + +static int drm_fb_helper_panic(struct notifier_block *n, unsigned long ununsed, + void *panic_str) +{ + /* + * It's a waste of time and effort to switch back to text console + * if the kernel should reboot before panic messages can be seen. + */ + if (panic_timeout < 0) + return 0; + + pr_err("panic occurred, switching back to text console\n"); + return drm_fb_helper_force_kernel_mode(); +} + +static struct notifier_block paniced = { + .notifier_call = drm_fb_helper_panic, +}; + +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 (dev->primary->master) + return false; + + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { + 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 +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; + + /* + * fbdev->blank can be called from irq context in case of a panic. + * Since we already have our own special panic handler which will + * restore the fbdev console mode completely, just bail out early. + */ + if (oops_in_progress) + return; + + /* + * 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 */ + for (j = 0; j < fb_helper->connector_count; 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) +{ + 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_crtc_free(struct drm_fb_helper *helper) +{ + int i; + + for (i = 0; i < helper->connector_count; i++) + kfree(helper->connector_info[i]); + kfree(helper->connector_info); + for (i = 0; i < helper->crtc_count; i++) { + kfree(helper->crtc_info[i].mode_set.connectors); + if (helper->crtc_info[i].mode_set.mode) + drm_mode_destroy(helper->dev, helper->crtc_info[i].mode_set.mode); + } + kfree(helper->crtc_info); +} + +/** + * 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); + 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 (!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; + list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { + 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); + +void drm_fb_helper_fini(struct drm_fb_helper *fb_helper) +{ + if (!list_empty(&fb_helper->kernel_fb_list)) { + list_del(&fb_helper->kernel_fb_list); + if (list_empty(&kernel_fb_helper_list)) { + pr_info("drm: unregistered panic notifier\n"); + atomic_notifier_chain_unregister(&panic_notifier_list, + &paniced); + unregister_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); + } + } + + drm_fb_helper_crtc_free(fb_helper); + +} +EXPORT_SYMBOL(drm_fb_helper_fini); + +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; + int pindex; + + 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; + + pindex = regno; + + if (fb->bits_per_pixel == 16) { + pindex = regno << 3; + + if (fb->depth == 16 && regno > 63) + return -EINVAL; + if (fb->depth == 15 && regno > 31) + return -EINVAL; + + if (fb->depth == 16) { + u16 r, g, b; + int i; + if (regno < 32) { + for (i = 0; i < 8; i++) + fb_helper->funcs->gamma_set(crtc, red, + green, blue, pindex + i); + } + + fb_helper->funcs->gamma_get(crtc, &r, + &g, &b, + pindex >> 1); + + for (i = 0; i < 4; i++) + fb_helper->funcs->gamma_set(crtc, r, + green, b, + (pindex >> 1) + i); + } + } + + if (fb->depth != 16) + fb_helper->funcs->gamma_set(crtc, red, green, blue, pindex); + 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 (__drm_modeset_lock_all(dev, !!oops_in_progress)) { + return -EBUSY; + } + 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; + + /* Need to resize the fb object !!! */ + if (var->bits_per_pixel > fb->bits_per_pixel || + 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 is greater 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->bits_per_pixel); + 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 (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); + +/** + * 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 (__drm_modeset_lock_all(dev, !!oops_in_progress)) { + return -EBUSY; + } + if (!drm_fb_helper_is_bound(fb_helper)) { + drm_modeset_unlock_all(dev); + return -EBUSY; + } + + 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; + } + } + } + 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 fb_info *info; + 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 */ + for (i = 0; i < fb_helper->connector_count; 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; + + info = fb_helper->fbdev; + + /* + * 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; + + + info->var.pixclock = 0; + if (register_framebuffer(info) < 0) + return -EINVAL; + + dev_info(fb_helper->dev->dev, "fb%d: %s frame buffer device\n", + info->node, info->fix.id); + + /* Switch back to kernel console on panic */ + /* multi card linked list maybe */ + if (list_empty(&kernel_fb_helper_list)) { + dev_info(fb_helper->dev->dev, "registered panic notifier\n"); + atomic_notifier_chain_register(&panic_notifier_list, + &paniced); + register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); + } + + list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); + + 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->bits_per_pixel; + 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->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; + + for (i = 0; i < fb_helper->connector_count; 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; + + for (i = 0; i < fb_helper->connector_count; 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; + + for (i = 0; i < fb_helper->connector_count; 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; + for (i = 0; i < fb_helper->connector_count; 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; + for (i = 0; i < fb_helper->connector_count; 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); + + for (i = 0; i < fb_helper->connector_count; 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; + + for (i = 0; i < fb_helper->connector_count; 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; + int i; + uint64_t conn_configured = 0, mask; + int tile_pass = 0; + mask = (1 << fb_helper->connector_count) - 1; +retry: + for (i = 0; i < fb_helper->connector_count; i++) { + fb_helper_conn = fb_helper->connector_info[i]; + + if (conn_configured & (1 << i)) + continue; + + if (enabled[i] == false) { + conn_configured |= (1 << 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 |= (1 << 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_device *dev = fb_helper->dev; + 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(dev->mode_config.num_connector * + 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; + 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, + dev->mode_config.num_connector * + sizeof(struct drm_fb_helper_crtc *)); + } + } +out: + kfree(crtcs); + return best_score; +} + +static void drm_setup_crtcs(struct drm_fb_helper *fb_helper) +{ + struct drm_device *dev = fb_helper->dev; + struct drm_fb_helper_crtc **crtcs; + struct drm_display_mode **modes; + struct drm_fb_offset *offsets; + struct drm_mode_set *modeset; + bool *enabled; + int width, height; + int i; + + DRM_DEBUG_KMS("\n"); + + width = dev->mode_config.max_width; + height = dev->mode_config.max_height; + + crtcs = kcalloc(dev->mode_config.num_connector, + sizeof(struct drm_fb_helper_crtc *), GFP_KERNEL); + modes = kcalloc(dev->mode_config.num_connector, + sizeof(struct drm_display_mode *), GFP_KERNEL); + offsets = kcalloc(dev->mode_config.num_connector, + sizeof(struct drm_fb_offset), GFP_KERNEL); + enabled = kcalloc(dev->mode_config.num_connector, + 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, dev->mode_config.num_connector*sizeof(modes[0])); + memset(crtcs, 0, dev->mode_config.num_connector*sizeof(crtcs[0])); + memset(offsets, 0, dev->mode_config.num_connector*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++) { + modeset = &fb_helper->crtc_info[i].mode_set; + modeset->num_connectors = 0; + modeset->fb = NULL; + } + + for (i = 0; i < fb_helper->connector_count; i++) { + struct drm_display_mode *mode = modes[i]; + struct drm_fb_helper_crtc *fb_crtc = crtcs[i]; + struct drm_fb_offset *offset = &offsets[i]; + modeset = &fb_crtc->mode_set; + + if (mode && fb_crtc) { + 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; + if (modeset->mode) + drm_mode_destroy(dev, modeset->mode); + modeset->mode = drm_mode_duplicate(dev, + fb_crtc->desired_mode); + modeset->connectors[modeset->num_connectors++] = fb_helper->connector_info[i]->connector; + modeset->fb = fb_helper->fb; + modeset->x = offset->x; + modeset->y = offset->y; + } + } + + /* Clear out any old modes if there are no more connected outputs. */ + for (i = 0; i < fb_helper->crtc_count; i++) { + modeset = &fb_helper->crtc_info[i].mode_set; + if (modeset->num_connectors == 0) { + BUG_ON(modeset->fb); + if (modeset->mode) + drm_mode_destroy(dev, modeset->mode); + modeset->mode = NULL; + } + } +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. + * + * 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; + int count = 0; + + mutex_lock(&dev->mode_config.mutex); + count = drm_fb_helper_probe_connector_modes(fb_helper, + dev->mode_config.max_width, + dev->mode_config.max_height); + mutex_unlock(&dev->mode_config.mutex); + /* + * we shouldn't end up with no modes here. + */ + if (count == 0) + dev_info(fb_helper->dev->dev, "No connectors reported connected with modes\n"); + + drm_setup_crtcs(fb_helper); + + return drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); +} +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 aftert 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; + u32 max_width, max_height; + + mutex_lock(&fb_helper->dev->mode_config.mutex); + if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { + fb_helper->delayed_hotplug = true; + mutex_unlock(&fb_helper->dev->mode_config.mutex); + return 0; + } + DRM_DEBUG_KMS("\n"); + + max_width = fb_helper->fb->width; + max_height = fb_helper->fb->height; + + drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height); + mutex_unlock(&fb_helper->dev->mode_config.mutex); + + drm_modeset_lock_all(dev); + drm_setup_crtcs(fb_helper); + drm_modeset_unlock_all(dev); + 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. + */ +#if defined(CONFIG_FRAMEBUFFER_CONSOLE_MODULE) && !defined(CONFIG_EXPERT) +static int __init drm_fb_helper_modinit(void) +{ + 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); + return 0; +} + +module_init(drm_fb_helper_modinit); +#endif |