drm/i915/display: Print display info inside driver display initialization

Separate the printing of display version and feature flags from the main
driver probe to inside the display initialization. This is in alignment
with isolating the display code from the main driver and helps Xe driver
to resuse it.

v2: Replace drm_info_printer with drm_debug_printer (Jani)
Signed-off-by: Balasubramani Vivekanandan <balasubramani.vivekanandan@intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: José Roberto de Souza <jose.souza@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20230921105954.2002469-1-balasubramani.vivekanandan@intel.com

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

@@ -380,6 +380,8 @@ int intel_display_driver_probe(struct drm_i915_private *i915)
 
 void intel_display_driver_register(struct drm_i915_private *i915)
 {
+	struct drm_printer p = drm_debug_printer("i915 display info:");
+
 	if (!HAS_DISPLAY(i915))
 		return;
 
@@ -407,6 +409,9 @@ void intel_display_driver_register(struct drm_i915_private *i915)
 	 * fbdev->async_cookie.
 	 */
 	drm_kms_helper_poll_init(&i915->drm);
+
+	intel_display_device_info_print(DISPLAY_INFO(i915),
+					DISPLAY_RUNTIME_INFO(i915), &p);
 }
 
 /* part #1: call before irq uninstall */

drivers/gpu/drm/i915/i915_driver.c

@@ -699,8 +699,6 @@ static void i915_welcome_messages(struct drm_i915_private *dev_priv)
 
 		intel_device_info_print(INTEL_INFO(dev_priv),
 					RUNTIME_INFO(dev_priv), &p);
-		intel_display_device_info_print(DISPLAY_INFO(dev_priv),
-						DISPLAY_RUNTIME_INFO(dev_priv), &p);
 		i915_print_iommu_status(dev_priv, &p);
 		for_each_gt(gt, dev_priv, i)
 			intel_gt_info_print(&gt->info, &p);