/* * 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> MODULE_AUTHOR("David Airlie, Jesse Barnes"); MODULE_DESCRIPTION("DRM KMS helper"); MODULE_LICENSE("GPL and additional rights"); 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 independantely from the crtc * helper functions used by many drivers to implement the kernel mode setting * interfaces. * * Initialization is done as a three-step process with drm_fb_helper_init(), * drm_fb_helper_single_add_all_connectors() and drm_fb_helper_initial_config(). * Drivers with fancier requirements than the default beheviour can override the * second 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 proves 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. */ /** * 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); static int drm_fb_helper_parse_command_line(struct drm_fb_helper *fb_helper) { struct drm_fb_helper_connector *fb_helper_conn; int i; for (i = 0; i < fb_helper->connector_count; i++) { struct drm_cmdline_mode *mode; struct drm_connector *connector; char *option = NULL; fb_helper_conn = fb_helper->connector_info[i]; connector = fb_helper_conn->connector; mode = &fb_helper_conn->cmdline_mode; /* do something on return - turn off connector maybe */ if (fb_get_options(drm_get_connector_name(connector), &option)) continue; if (drm_mode_parse_command_line_for_connector(option, connector, mode)) { if (mode->force) { const char *s; switch (mode->force) { case DRM_FORCE_OFF: s = "OFF"; break; case DRM_FORCE_ON_DIGITAL: s = "ON - dig"; break; default: case DRM_FORCE_ON: s = "ON"; break; } DRM_INFO("forcing %s connector %s\n", drm_get_connector_name(connector), s); connector->force = mode->force; } DRM_DEBUG_KMS("cmdline mode for connector %s %dx%d@%dHz%s%s%s\n", drm_get_connector_name(connector), mode->xres, mode->yres, mode->refresh_specified ? mode->refresh : 60, mode->rb ? " reduced blanking" : "", mode->margins ? " with margins" : "", mode->interlace ? " interlaced" : ""); } } return 0; } 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; struct drm_crtc_helper_funcs *funcs; int i; if (list_empty(&kernel_fb_helper_list)) return false; 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->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; 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); /** * 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. */ bool drm_fb_helper_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) drm_plane_force_disable(plane); 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; } EXPORT_SYMBOL(drm_fb_helper_restore_fbdev_mode); /* * 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) { if (helper->dev->switch_power_state == DRM_SWITCH_POWER_OFF) continue; ret = drm_fb_helper_restore_fbdev_mode(helper); if (ret) error = true; } 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; list_for_each_entry(crtc, &dev->mode_config.crtc_list, head) { if (crtc->fb) crtcs_bound++; if (crtc->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_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 set fb_helper->funcs before calling * drm_fb_helper_initial_config(). * * 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; fb_helper->dev = dev; INIT_LIST_HEAD(&fb_helper->kernel_fb_list); 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_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; struct drm_crtc_helper_funcs *crtc_funcs; u16 *red, *green, *blue, *transp; struct drm_crtc *crtc; int i, j, rc = 0; int start; 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; /* 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 drm_device *dev = fb_helper->dev; struct fb_var_screeninfo *var = &info->var; int ret; int i; if (var->pixclock != 0) { DRM_ERROR("PIXEL CLOCK SET\n"); return -EINVAL; } drm_modeset_lock_all(dev); for (i = 0; i < fb_helper->crtc_count; i++) { ret = drm_mode_set_config_internal(&fb_helper->crtc_info[i].mode_set); if (ret) { drm_modeset_unlock_all(dev); return ret; } } drm_modeset_unlock_all(dev); if (fb_helper->delayed_hotplug) { fb_helper->delayed_hotplug = false; drm_fb_helper_hotplug_event(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; struct drm_crtc *crtc; int ret = 0; int i; 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; 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->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; desired_mode = fb_helper->crtc_info[i].desired_mode; if (desired_mode) { if (gamma_size == 0) gamma_size = fb_helper->crtc_info[i].mode_set.crtc->gamma_size; if (desired_mode->hdisplay < sizes.fb_width) sizes.fb_width = desired_mode->hdisplay; if (desired_mode->vdisplay < sizes.fb_height) sizes.fb_height = desired_mode->vdisplay; if (desired_mode->hdisplay > sizes.surface_width) sizes.surface_width = desired_mode->hdisplay; if (desired_mode->vdisplay > sizes.surface_height) sizes.surface_height = desired_mode->vdisplay; crtc_count++; } } 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.type_aux = 0; 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; } static 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 (drm_mode_width(mode) > width || drm_mode_height(mode) > height) continue; if (mode->type & DRM_MODE_TYPE_PREFERRED) return mode; } return NULL; } static bool drm_has_cmdline_mode(struct drm_fb_helper_connector *fb_connector) { struct drm_cmdline_mode *cmdline_mode; cmdline_mode = &fb_connector->cmdline_mode; return cmdline_mode->specified; } static 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 = NULL; cmdline_mode = &fb_helper_conn->cmdline_mode; if (cmdline_mode->specified == false) return mode; /* 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; 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; } return mode; } 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; } 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, 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 bool drm_target_preferred(struct drm_fb_helper *fb_helper, struct drm_display_mode **modes, bool *enabled, int width, int height) { struct drm_fb_helper_connector *fb_helper_conn; int i; for (i = 0; i < fb_helper->connector_count; i++) { fb_helper_conn = fb_helper->connector_info[i]; if (enabled[i] == false) continue; 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\n", fb_helper_conn->connector->base.id); 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"); } 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; struct drm_connector_helper_funcs *connector_funcs; struct drm_encoder *encoder; struct drm_fb_helper_crtc *best_crtc; 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_crtc = 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_crtc = crtc; 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_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); enabled = kcalloc(dev->mode_config.num_connector, sizeof(bool), GFP_KERNEL); if (!crtcs || !modes || !enabled) { 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, 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])); if (!drm_target_cloned(fb_helper, modes, enabled, width, height) && !drm_target_preferred(fb_helper, modes, 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]; modeset = &fb_crtc->mode_set; if (mode && fb_crtc) { DRM_DEBUG_KMS("desired mode %s set on crtc %d\n", mode->name, fb_crtc->mode_set.crtc->base.id); fb_crtc->desired_mode = mode; 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; } } /* 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); BUG_ON(modeset->num_connectors); if (modeset->mode) drm_mode_destroy(dev, modeset->mode); modeset->mode = NULL; } } out: kfree(crtcs); kfree(modes); 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. */ bool drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) { struct drm_device *dev = fb_helper->dev; int count = 0; drm_fb_helper_parse_command_line(fb_helper); count = drm_fb_helper_probe_connector_modes(fb_helper, dev->mode_config.max_width, dev->mode_config.max_height); /* * 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 the driver must ensure that this is only called _after_ the fb has * been fully set up, i.e. after the call to drm_fb_helper_initial_config. * * 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; int count = 0; u32 max_width, max_height, bpp_sel; if (!fb_helper->fb) return 0; mutex_lock(&fb_helper->dev->mode_config.mutex); if (!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; bpp_sel = fb_helper->fb->bits_per_pixel; count = 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