drm/i915: Reset crtc after resume

Based on a patch by Takashi Iwai.

Reported-by: Matthias Hopf <mat@mshopf.de>
Bugzilla: https://bugzilla.kernel.org/show_bug.cgi?id=27272
Tested-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Chris Wilson <chris@chris-wilson.co.uk>

diff --git a/drivers/gpu/drm/i915/intel_display.c b/drivers/gpu/drm/i915/intel_display.c
index d7f237d..7e42aa5 100644 (file)
--- a/drivers/gpu/drm/i915/intel_display.c
+++ b/drivers/gpu/drm/i915/intel_display.c
@@ -5551,6 +5551,18 @@ cleanup_work:
        return ret;
 }
 
+static void intel_crtc_reset(struct drm_crtc *crtc)
+{
+       struct intel_crtc *intel_crtc = to_intel_crtc(crtc);
+
+       /* Reset flags back to the 'unknown' status so that they
+        * will be correctly set on the initial modeset.
+        */
+       intel_crtc->cursor_addr = 0;
+       intel_crtc->dpms_mode = -1;
+       intel_crtc->active = true; /* force the pipe off on setup_init_config */
+}
+
 static struct drm_crtc_helper_funcs intel_helper_funcs = {
        .dpms = intel_crtc_dpms,
        .mode_fixup = intel_crtc_mode_fixup,
@@ -5562,6 +5574,7 @@ static struct drm_crtc_helper_funcs intel_helper_funcs = {
 };
 
 static const struct drm_crtc_funcs intel_crtc_funcs = {
+       .reset = intel_crtc_reset,
        .cursor_set = intel_crtc_cursor_set,
        .cursor_move = intel_crtc_cursor_move,
        .gamma_set = intel_crtc_gamma_set,
@@ -5652,9 +5665,7 @@ static void intel_crtc_init(struct drm_device *dev, int pipe)
        dev_priv->plane_to_crtc_mapping[intel_crtc->plane] = &intel_crtc->base;
        dev_priv->pipe_to_crtc_mapping[intel_crtc->pipe] = &intel_crtc->base;
 
-       intel_crtc->cursor_addr = 0;
-       intel_crtc->dpms_mode = -1;
-       intel_crtc->active = true; /* force the pipe off on setup_init_config */
+       intel_crtc_reset(&intel_crtc->base);
 
        if (HAS_PCH_SPLIT(dev)) {
                intel_helper_funcs.prepare = ironlake_crtc_prepare;