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: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: ca91a2758fce ("drm/fb-helper: Support deferred setup")
Cc: <stable@vger.kernel.org> # v4.14+
Reported-by: Thomas Voegtle <tv@lio96.de>
Tested-by: Thomas Voegtle <tv@lio96.de>
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>
Link: https://patchwork.freedesktop.org/patch/msgid/20171128111603.62757-1-maarten.lankhorst@linux.intel.com

diff --git a/drivers/gpu/drm/drm_fb_helper.c b/drivers/gpu/drm/drm_fb_helper.c
index 07374008f146fa946750b1cfd3bf13bfd1b9c47d..e561663344559b065643464cf669d8b84930007f 100644 (file)
--- a/drivers/gpu/drm/drm_fb_helper.c
+++ b/drivers/gpu/drm/drm_fb_helper.c
@@ -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;
        }