drm/i915/reset: Reorganize display reset code

Stop returning the "is there a display?" status from
intel_display_reset_prepare(). I plan to move the pending_fb_pin
into the i915 code, so I need to make that determination already
before intel_display_reset_prepare() is called. Add a new
intel_display_reset_supported() function for that.

v2: Also check display!=NULL for mock tests

Cc: Jouni Högander <jouni.hogander@intel.com>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Reviewed-by: Jani Nikula <jani.nikula@intel.com>
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patch.msgid.link/20260415210411.24750-4-ville.syrjala@linux.intel.com

3 files changed, 20 insertions, 19 deletions

diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.c b/drivers/gpu/drm/i915/display/intel_display_reset.c
index d00ef5bdcbda..fc661c623cb8 100644
--- a/drivers/gpu/drm/i915/display/intel_display_reset.c
+++ b/drivers/gpu/drm/i915/display/intel_display_reset.c
@@ -16,22 +16,24 @@
 #include "intel_hotplug.h"
 #include "intel_pps.h"
 
+bool intel_display_reset_supported(struct intel_display *display)
+{
+	return display && HAS_DISPLAY(display);
+}
+
 bool intel_display_reset_test(struct intel_display *display)
 {
-	return display->params.force_reset_modeset_test;
+	return display && HAS_DISPLAY(display) &&
+		display->params.force_reset_modeset_test;
 }
 
-/* returns true if intel_display_reset_finish() needs to be called */
-bool intel_display_reset_prepare(struct intel_display *display,
+void intel_display_reset_prepare(struct intel_display *display,
 				 modeset_stuck_fn modeset_stuck, void *context)
 {
 	struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
 	struct drm_atomic_state *state;
 	int ret;
 
-	if (!HAS_DISPLAY(display))
-		return false;
-
 	if (atomic_read(&display->restore.pending_fb_pin)) {
 		drm_dbg_kms(display->drm,
 			    "Modeset potentially stuck, unbreaking through wedging\n");
@@ -60,7 +62,7 @@ bool intel_display_reset_prepare(struct intel_display *display,
 		ret = PTR_ERR(state);
 		drm_err(display->drm, "Duplicating state failed with %i\n",
 			ret);
-		return true;
+		return;
 	}
 
 	ret = drm_atomic_helper_disable_all(display->drm, ctx);
@@ -68,13 +70,11 @@ bool intel_display_reset_prepare(struct intel_display *display,
 		drm_err(display->drm, "Suspending crtc's failed with %i\n",
 			ret);
 		drm_atomic_state_put(state);
-		return true;
+		return;
 	}
 
 	display->restore.modeset_state = state;
 	state->acquire_ctx = ctx;
-
-	return true;
 }
 
 void intel_display_reset_finish(struct intel_display *display, bool test_only)
@@ -83,9 +83,6 @@ void intel_display_reset_finish(struct intel_display *display, bool test_only)
 	struct drm_atomic_state *state;
 	int ret;
 
-	if (!HAS_DISPLAY(display))
-		return;
-
 	state = fetch_and_zero(&display->restore.modeset_state);
 	if (!state)
 		goto unlock;
diff --git a/drivers/gpu/drm/i915/display/intel_display_reset.h b/drivers/gpu/drm/i915/display/intel_display_reset.h
index 8b3bda134454..e0f15e757728 100644
--- a/drivers/gpu/drm/i915/display/intel_display_reset.h
+++ b/drivers/gpu/drm/i915/display/intel_display_reset.h
@@ -12,8 +12,9 @@ struct intel_display;
 
 typedef void modeset_stuck_fn(void *context);
 
+bool intel_display_reset_supported(struct intel_display *display);
 bool intel_display_reset_test(struct intel_display *display);
-bool intel_display_reset_prepare(struct intel_display *display,
+void intel_display_reset_prepare(struct intel_display *display,
 				 modeset_stuck_fn modeset_stuck, void *context);
 void intel_display_reset_finish(struct intel_display *display, bool test_only);
 
diff --git a/drivers/gpu/drm/i915/gt/intel_reset.c b/drivers/gpu/drm/i915/gt/intel_reset.c
index 37272871b0f2..ffd11767874f 100644
--- a/drivers/gpu/drm/i915/gt/intel_reset.c
+++ b/drivers/gpu/drm/i915/gt/intel_reset.c
@@ -1425,16 +1425,19 @@ static void intel_gt_reset_global(struct intel_gt *gt,
 		bool need_display_reset;
 		bool reset_display;
 
-		need_display_reset = intel_gt_gpu_reset_clobbers_display(gt) &&
+		need_display_reset =
+			intel_display_reset_supported(display) &&
+			intel_gt_gpu_reset_clobbers_display(gt) &&
 			intel_has_gpu_reset(gt);
 
-		reset_display = intel_display_reset_test(display) ||
+		reset_display =
+			intel_display_reset_test(display) ||
 			need_display_reset;
 
 		if (reset_display)
-			reset_display = intel_display_reset_prepare(display,
-								    display_reset_modeset_stuck,
-								    gt);
+			intel_display_reset_prepare(display,
+						    display_reset_modeset_stuck,
+						    gt);
 
 		intel_gt_reset(gt, engine_mask, reason);