drm: Pull together probe + setup for drm_fb_helper

drm_fb_helper_probe_connector_modes() is always called before
drm_setup_crtcs(), so just move the call into drm_setup_crtcs for a
small bit of code compaction.

Note that register_framebuffer will do a modeset (when fbcon is enabled)
and hence must be moved out of the critical section. A follow-up patch
will add new locking for the fb list, hence move all the related
registration code together.

Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>
Reviewed-by: Daniel Vetter <daniel.vetter@intel.com>
Signed-off-by: Sean Paul <seanpaul@chromium.org>
Link: http://patchwork.freedesktop.org/patch/msgid/20161129120217.7344-2-chris@chris-wilson.co.uk

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 380a0ec..90da28d 100644 (file)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -2099,20 +2099,19 @@ out:
        return best_score;
 }
 
-static void drm_setup_crtcs(struct drm_fb_helper *fb_helper)
+static void drm_setup_crtcs(struct drm_fb_helper *fb_helper,
+                           u32 width, u32 height)
 {
        struct drm_device *dev = fb_helper->dev;
        struct drm_fb_helper_crtc **crtcs;
        struct drm_display_mode **modes;
        struct drm_fb_offset *offsets;
        bool *enabled;
-       int width, height;
        int i;
 
        DRM_DEBUG_KMS("\n");
-
-       width = dev->mode_config.max_width;
-       height = dev->mode_config.max_height;
+       if (drm_fb_helper_probe_connector_modes(fb_helper, width, height) == 0)
+               DRM_DEBUG_KMS("No connectors reported connected with modes\n");
 
        /* prevent concurrent modification of connector_count by hotplug */
        lockdep_assert_held(&fb_helper->dev->mode_config.mutex);
@@ -2236,23 +2235,15 @@ 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 count = 0;
        int ret;
 
        if (!drm_fbdev_emulation)
                return 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);
-       /*
-        * 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);
+       drm_setup_crtcs(fb_helper,
+                       dev->mode_config.max_width,
+                       dev->mode_config.max_height);
        ret = drm_fb_helper_single_fb_probe(fb_helper, bpp_sel);
        mutex_unlock(&dev->mode_config.mutex);
        if (ret)
@@ -2300,28 +2291,22 @@ EXPORT_SYMBOL(drm_fb_helper_initial_config);
 int drm_fb_helper_hotplug_event(struct drm_fb_helper *fb_helper)
 {
        struct drm_device *dev = fb_helper->dev;
-       u32 max_width, max_height;
 
        if (!drm_fbdev_emulation)
                return 0;
 
-       mutex_lock(&fb_helper->dev->mode_config.mutex);
+       mutex_lock(&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);
+               mutex_unlock(&dev->mode_config.mutex);
                return 0;
        }
        DRM_DEBUG_KMS("\n");
 
-       max_width = fb_helper->fb->width;
-       max_height = fb_helper->fb->height;
+       drm_setup_crtcs(fb_helper, fb_helper->fb->width, fb_helper->fb->height);
 
-       drm_fb_helper_probe_connector_modes(fb_helper, max_width, max_height);
-       mutex_unlock(&fb_helper->dev->mode_config.mutex);
+       mutex_unlock(&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;