Commit 52dd0650 authored by Maarten Lankhorst's avatar Maarten Lankhorst

drm/fb_helper: Disable all crtc's when initial setup fails.

Some drivers like i915 start with crtc's enabled, but with deferred
fbcon setup they were no longer disabled as part of fbdev setup.
Headless units could no longer enter pc3 state because the crtc was
still enabled.

Fix this by calling restore_fbdev_mode when we would have called
it otherwise once during initial fbdev setup.
Signed-off-by: 's avatarMaarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: ca91a275 ("drm/fb-helper: Support deferred setup")
Cc: <stable@vger.kernel.org> # v4.14+
Reported-by: 's avatarThomas Voegtle <tv@lio96.de>
Tested-by: 's avatarThomas Voegtle <tv@lio96.de>
Reviewed-by: 's avatarDaniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171128111603.62757-1-maarten.lankhorst@linux.intel.com
parent a76dfe35
......@@ -1809,6 +1809,10 @@ 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) {
DRM_INFO("Cannot find any crtc or sizes\n");
/* First time: disable all crtc's.. */
if (!fb_helper->deferred_setup && !READ_ONCE(fb_helper->dev->master))
restore_fbdev_mode(fb_helper);
return -EAGAIN;
}
......
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