diff options
| -rw-r--r-- | drivers/gpu/drm/drm_fb_helper.c | 102 | ||||
| -rw-r--r-- | include/drm/drm_fb_helper.h | 23 |
2 files changed, 90 insertions, 35 deletions
diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c index 42090fe00ef9..4b968f5b9c85 100644 --- a/drivers/gpu/drm/drm_fb_helper.c +++ b/drivers/gpu/drm/drm_fb_helper.c @@ -501,6 +501,9 @@ int drm_fb_helper_restore_fbdev_mode_unlocked(struct drm_fb_helper *fb_helper) if (!drm_fbdev_emulation) return -ENODEV; + if (READ_ONCE(fb_helper->deferred_setup)) + return 0; + mutex_lock(&fb_helper->lock); ret = restore_fbdev_mode(fb_helper); @@ -1707,8 +1710,7 @@ 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. + * the ->fb_probe callback. */ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, int preferred_bpp) @@ -1806,13 +1808,8 @@ static int drm_fb_helper_single_fb_probe(struct drm_fb_helper *fb_helper, } 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; + DRM_INFO("Cannot find any crtc or sizes\n"); + return -EAGAIN; } /* Handle our overallocation */ @@ -2441,6 +2438,59 @@ out: kfree(enabled); } +/* Note: Drops fb_helper->lock before returning. */ +static int +__drm_fb_helper_initial_config_and_unlock(struct drm_fb_helper *fb_helper, + int bpp_sel) +{ + struct drm_device *dev = fb_helper->dev; + struct fb_info *info; + unsigned int width, height; + int ret; + + width = dev->mode_config.max_width; + height = dev->mode_config.max_height; + + drm_setup_crtcs(fb_helper, width, height); + ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); + if (ret < 0) { + if (ret == -EAGAIN) { + fb_helper->preferred_bpp = bpp_sel; + fb_helper->deferred_setup = true; + ret = 0; + } + mutex_unlock(&fb_helper->lock); + + return ret; + } + + fb_helper->deferred_setup = false; + + info = fb_helper->fbdev; + info->var.pixclock = 0; + + /* Need to drop locks to avoid recursive deadlock in + * register_framebuffer. This is ok because the only thing left to do is + * register the fbdev emulation instance in kernel_fb_helper_list. */ + mutex_unlock(&fb_helper->lock); + + ret = register_framebuffer(info); + if (ret < 0) + return ret; + + dev_info(dev->dev, "fb%d: %s frame buffer device\n", + info->node, info->fix.id); + + mutex_lock(&kernel_fb_helper_lock); + if (list_empty(&kernel_fb_helper_list)) + register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); + + list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); + mutex_unlock(&kernel_fb_helper_lock); + + return 0; +} + /** * drm_fb_helper_initial_config - setup a sane initial connector configuration * @fb_helper: fb_helper device struct @@ -2485,39 +2535,15 @@ out: */ int drm_fb_helper_initial_config(struct drm_fb_helper *fb_helper, int bpp_sel) { - struct drm_device *dev = fb_helper->dev; - struct fb_info *info; int ret; if (!drm_fbdev_emulation) return 0; mutex_lock(&fb_helper->lock); - drm_setup_crtcs(fb_helper, - dev->mode_config.max_width, - dev->mode_config.max_height); - ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel); - mutex_unlock(&fb_helper->lock); - if (ret) - return ret; + ret = __drm_fb_helper_initial_config_and_unlock(fb_helper, bpp_sel); - info = fb_helper->fbdev; - info->var.pixclock = 0; - ret = register_framebuffer(info); - if (ret < 0) - return ret; - - dev_info(dev->dev, "fb%d: %s frame buffer device\n", - info->node, info->fix.id); - - mutex_lock(&kernel_fb_helper_lock); - if (list_empty(&kernel_fb_helper_list)) - register_sysrq_key('v', &sysrq_drm_fb_helper_restore_op); - - list_add(&fb_helper->kernel_fb_list, &kernel_fb_helper_list); - mutex_unlock(&kernel_fb_helper_lock); - - return 0; + return ret; } EXPORT_SYMBOL(drm_fb_helper_initial_config); @@ -2550,6 +2576,12 @@ int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper) return 0; mutex_lock(&fb_helper->lock); + if (fb_helper->deferred_setup) { + err = __drm_fb_helper_initial_config_and_unlock(fb_helper, + fb_helper->preferred_bpp); + return err; + } + if (!fb_helper->fb || !drm_fb_helper_is_bound(fb_helper)) { fb_helper->delayed_hotplug = true; mutex_unlock(&fb_helper->lock); diff --git a/include/drm/drm_fb_helper.h b/include/drm/drm_fb_helper.h index ea170b96e88d..a5ea6ffdfecc 100644 --- a/include/drm/drm_fb_helper.h +++ b/include/drm/drm_fb_helper.h @@ -232,6 +232,29 @@ struct drm_fb_helper { * needs to be reprobe when fbdev is in control again. */ bool delayed_hotplug; + + /** + * @deferred_setup: + * + * If no outputs are connected (disconnected or unknown) the FB helper + * code will defer setup until at least one of the outputs shows up. + * This field keeps track of the status so that setup can be retried + * at every hotplug event until it succeeds eventually. + * + * Protected by @lock. + */ + bool deferred_setup; + + /** + * @preferred_bpp: + * + * Temporary storage for the driver's preferred BPP setting passed to + * FB helper initialization. This needs to be tracked so that deferred + * FB helper setup can pass this on. + * + * See also: @deferred_setup + */ + int preferred_bpp; }; /** |