commit 94b541f53db1ec6b99fc2186b084177cf6e18824
Author: Hans de Goede <hdegoede@redhat.com>
Date:   Tue Oct 5 22:23:21 2021 +0200

    drm/i915: Add intel_modeset_probe_defer() helper
    
    The upcoming privacy-screen support adds another check for
    deferring probe till some other drivers have bound first.
    
    Factor out the current vga_switcheroo_client_probe_defer() check
    into an intel_modeset_probe_defer() helper, so that further
    probe-deferral checks can be added there.
    
    Reviewed-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
    Signed-off-by: Hans de Goede <hdegoede@redhat.com>
    Link: https://patchwork.freedesktop.org/patch/msgid/20211005202322.700909-10-hdegoede@redhat.com

diff --git a/drivers/gpu/drm/i915/display/intel_display.c b/drivers/gpu/drm/i915/display/intel_display.c
index 3b411dfd83f5..241cf0c9ffe2 100644
--- a/drivers/gpu/drm/i915/display/intel_display.c
+++ b/drivers/gpu/drm/i915/display/intel_display.c
@@ -32,6 +32,7 @@
 #include <linux/module.h>
 #include <linux/dma-resv.h>
 #include <linux/slab.h>
+#include <linux/vga_switcheroo.h>
 
 #include <drm/drm_atomic.h>
 #include <drm/drm_atomic_helper.h>
@@ -10865,6 +10866,18 @@ void intel_modeset_driver_remove_nogem(struct drm_i915_private *i915)
 	intel_bios_driver_remove(i915);
 }
 
+bool intel_modeset_probe_defer(struct pci_dev *pdev)
+{
+	/*
+	 * apple-gmux is needed on dual GPU MacBook Pro
+	 * to probe the panel if we're the inactive GPU.
+	 */
+	if (vga_switcheroo_client_probe_defer(pdev))
+		return true;
+
+	return false;
+}
+
 void intel_display_driver_register(struct drm_i915_private *i915)
 {
 	if (!HAS_DISPLAY(i915))
diff --git a/drivers/gpu/drm/i915/display/intel_display.h b/drivers/gpu/drm/i915/display/intel_display.h
index 8d8725b45d99..4b688a9727b3 100644
--- a/drivers/gpu/drm/i915/display/intel_display.h
+++ b/drivers/gpu/drm/i915/display/intel_display.h
@@ -640,6 +640,7 @@ void intel_display_driver_register(struct drm_i915_private *i915);
 void intel_display_driver_unregister(struct drm_i915_private *i915);
 
 /* modesetting */
+bool intel_modeset_probe_defer(struct pci_dev *pdev);
 void intel_modeset_init_hw(struct drm_i915_private *i915);
 int intel_modeset_init_noirq(struct drm_i915_private *i915);
 int intel_modeset_init_nogem(struct drm_i915_private *i915);
diff --git a/drivers/gpu/drm/i915/i915_pci.c b/drivers/gpu/drm/i915/i915_pci.c
index a98941b512e5..158d160e3996 100644
--- a/drivers/gpu/drm/i915/i915_pci.c
+++ b/drivers/gpu/drm/i915/i915_pci.c
@@ -22,8 +22,6 @@
  *
  */
 
-#include <linux/vga_switcheroo.h>
-
 #include <drm/drm_drv.h>
 #include <drm/i915_pciids.h>
 
@@ -1206,11 +1204,8 @@ static int i915_pci_probe(struct pci_dev *pdev, const struct pci_device_id *ent)
 	if (PCI_FUNC(pdev->devfn))
 		return -ENODEV;
 
-	/*
-	 * apple-gmux is needed on dual GPU MacBook Pro
-	 * to probe the panel if we're the inactive GPU.
-	 */
-	if (vga_switcheroo_client_probe_defer(pdev))
+	/* Detect if we need to wait for other drivers early on */
+	if (intel_modeset_probe_defer(pdev))
 		return -EPROBE_DEFER;
 
 	err = i915_driver_probe(pdev, ent);