drm/i915: Frob the correct crtc state in intel_crtc_disable_noatomic()

The uapi vs. hw state split introduced a bug in
intel_crtc_disable_noatomic() where it's now frobbing an already
freed temp crtc state instead of adjusting the crtc state we
are really left with. Fix that by making a cleaner separation
beteen the two.

This causes explosions on any machine that boots up with pipes
already running but not hooked up to any encoder (typical
behaviour for gen2-4 VBIOS).

Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Fixes: 58d124ea2739 ("drm/i915: Complete crtc hw/uapi split, v6.")
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20191105171447.22111-1-ville.syrjala@linux.intel.com
Reviewed-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 876fc25..1f93860 100644 (file)
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -7191,11 +7191,13 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc,
        struct drm_i915_private *dev_priv = to_i915(crtc->dev);
        struct intel_bw_state *bw_state =
                to_intel_bw_state(dev_priv->bw_obj.state);
+       struct intel_crtc_state *crtc_state =
+               to_intel_crtc_state(crtc->state);
        enum intel_display_power_domain domain;
        struct intel_plane *plane;
        u64 domains;
        struct drm_atomic_state *state;
-       struct intel_crtc_state *crtc_state;
+       struct intel_crtc_state *temp_crtc_state;
        int ret;
 
        if (!intel_crtc->active)
@@ -7219,12 +7221,12 @@ static void intel_crtc_disable_noatomic(struct drm_crtc *crtc,
        state->acquire_ctx = ctx;
 
        /* Everything's already locked, -EDEADLK can't happen. */
-       crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
+       temp_crtc_state = intel_atomic_get_crtc_state(state, intel_crtc);
        ret = drm_atomic_add_affected_connectors(state, crtc);
 
-       WARN_ON(IS_ERR(crtc_state) || ret);
+       WARN_ON(IS_ERR(temp_crtc_state) || ret);
 
-       dev_priv->display.crtc_disable(crtc_state, to_intel_atomic_state(state));
+       dev_priv->display.crtc_disable(temp_crtc_state, to_intel_atomic_state(state));
 
        drm_atomic_state_put(state);