drm/i915/bios: move i915_vbt debugfs to intel_bios.c

All things VBT should be placed in intel_bios.c.

While at it, shove in a FIXME comment about VBT possibly originating
from other places than opregion.

Cc: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Reviewed-by: Radhakrishna Sripada <radhakrishna.sripada@intel.com>
Signed-off-by: Jani Nikula <jani.nikula@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/5e14a9559b6916022b506e5eb8d943783dc627a2.1704992868.git.jani.nikula@intel.com

drivers/gpu/drm/i915/display/intel_bios.c

@@ -3656,3 +3656,28 @@ void intel_bios_for_each_encoder(struct drm_i915_private *i915,
 	list_for_each_entry(devdata, &i915->display.vbt.display_devices, node)
 		func(i915, devdata);
 }
+
+static int intel_bios_vbt_show(struct seq_file *m, void *unused)
+{
+	struct drm_i915_private *i915 = m->private;
+	struct intel_opregion *opregion = &i915->display.opregion;
+
+	/*
+	 * FIXME: VBT might originate from other places than opregion, and then
+	 * this would be incorrect.
+	 */
+	if (opregion->vbt)
+		seq_write(m, opregion->vbt, opregion->vbt_size);
+
+	return 0;
+}
+
+DEFINE_SHOW_ATTRIBUTE(intel_bios_vbt);
+
+void intel_bios_debugfs_register(struct drm_i915_private *i915)
+{
+	struct drm_minor *minor = i915->drm.primary;
+
+	debugfs_create_file("i915_vbt", 0444, minor->debugfs_root,
+			    i915, &intel_bios_vbt_fops);
+}

drivers/gpu/drm/i915/display/intel_bios.h

@@ -280,4 +280,6 @@ void intel_bios_for_each_encoder(struct drm_i915_private *i915,
 				 void (*func)(struct drm_i915_private *i915,
 					      const struct intel_bios_encoder_data *devdata));
 
+void intel_bios_debugfs_register(struct drm_i915_private *i915);
+
 #endif /* _INTEL_BIOS_H_ */

drivers/gpu/drm/i915/display/intel_display_debugfs.c

@@ -97,17 +97,6 @@ static int i915_opregion(struct seq_file *m, void *unused)
 	return 0;
 }
 
-static int i915_vbt(struct seq_file *m, void *unused)
-{
-	struct drm_i915_private *i915 = node_to_i915(m->private);
-	struct intel_opregion *opregion = &i915->display.opregion;
-
-	if (opregion->vbt)
-		seq_write(m, opregion->vbt, opregion->vbt_size);
-
-	return 0;
-}
-
 static int i915_gem_framebuffer_info(struct seq_file *m, void *data)
 {
 	struct drm_i915_private *dev_priv = node_to_i915(m->private);
@@ -1067,7 +1056,6 @@ static const struct drm_info_list intel_display_debugfs_list[] = {
 	{"i915_frontbuffer_tracking", i915_frontbuffer_tracking, 0},
 	{"i915_sr_status", i915_sr_status, 0},
 	{"i915_opregion", i915_opregion, 0},
-	{"i915_vbt", i915_vbt, 0},
 	{"i915_gem_framebuffer", i915_gem_framebuffer_info, 0},
 	{"i915_power_domain_info", i915_power_domain_info, 0},
 	{"i915_display_info", i915_display_info, 0},
@@ -1105,6 +1093,7 @@ void intel_display_debugfs_register(struct drm_i915_private *i915)
 				 ARRAY_SIZE(intel_display_debugfs_list),
 				 minor->debugfs_root, minor);
 
+	intel_bios_debugfs_register(i915);
 	intel_cdclk_debugfs_register(i915);
 	intel_dmc_debugfs_register(i915);
 	intel_fbc_debugfs_register(i915);