drm/i915: Handle adjust better in intel_pipe_config_compare

Some parameters use CHECK_BOOL, but should really use
CHECK_BOOL_INCOMPLETE. We cannot currently check whether
the inherited infoframes and audio are set up correctly.
Signed-off-by: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20171110113503.16253-4-maarten.lankhorst@linux.intel.com
[mlankhorst: Add danvet's comment about why this is needed.]
Reviewed-by: Daniel Vetter <daniel.vetter@ffwll.ch>

drivers/gpu/drm/i915/intel_display.c

@@ -11073,6 +11073,9 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 			  bool adjust)
 {
 	bool ret = true;
+	bool fixup_inherited = adjust &&
+		(current_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED) &&
+		!(pipe_config->base.mode.private_flags & I915_MODE_FLAG_INHERITED);
 
 #define PIPE_CONF_CHECK_X(name)	\
 	if (current_config->name != pipe_config->name) { \
@@ -11101,6 +11104,22 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 		ret = false; \
 	}
 
+/*
+ * Checks state where we only read out the enabling, but not the entire
+ * state itself (like full infoframes or ELD for audio). These states
+ * require a full modeset on bootup to fix up.
+ */
+#define PIPE_CONF_CHECK_BOOL_INCOMPLETE(name) \
+	if (!fixup_inherited || (!current_config->name && !pipe_config->name)) { \
+		PIPE_CONF_CHECK_BOOL(name); \
+	} else { \
+		pipe_config_err(adjust, __stringify(name), \
+			  "unable to verify whether state matches exactly, forcing modeset (expected %s, found %s)\n", \
+			  yesno(current_config->name), \
+			  yesno(pipe_config->name)); \
+		ret = false; \
+	}
+
 #define PIPE_CONF_CHECK_P(name)	\
 	if (current_config->name != pipe_config->name) { \
 		pipe_config_err(adjust, __stringify(name), \
@@ -11225,10 +11244,10 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 
 	PIPE_CONF_CHECK_BOOL(hdmi_scrambling);
 	PIPE_CONF_CHECK_BOOL(hdmi_high_tmds_clock_ratio);
-	PIPE_CONF_CHECK_BOOL(has_infoframe);
+	PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_infoframe);
 	PIPE_CONF_CHECK_BOOL(ycbcr420);
 
-	PIPE_CONF_CHECK_BOOL(has_audio);
+	PIPE_CONF_CHECK_BOOL_INCOMPLETE(has_audio);
 
 	PIPE_CONF_CHECK_FLAGS(base.adjusted_mode.flags,
 			      DRM_MODE_FLAG_INTERLACE);
@@ -11303,6 +11322,7 @@ intel_pipe_config_compare(struct drm_i915_private *dev_priv,
 #undef PIPE_CONF_CHECK_X
 #undef PIPE_CONF_CHECK_I
 #undef PIPE_CONF_CHECK_BOOL
+#undef PIPE_CONF_CHECK_BOOL_INCOMPLETE
 #undef PIPE_CONF_CHECK_P
 #undef PIPE_CONF_CHECK_FLAGS
 #undef PIPE_CONF_CHECK_CLOCK_FUZZY