drm/i915/reset: add modeset_stuck callback to intel_display_reset_prepare()

Drop the dependency on gt by providing a callback for trying to unbreak
stuck modeset. Do intel_gt_set_wedged() via the callback.

It's by no means pretty, but this is perhaps the most straightforward
alternative.

Cc: Matt Roper <[e-mail]>
Reviewed-by: Matt Roper <[e-mail]>
Link: https://patchwork.freedesktop.org/patch/msgid/d32[e-mail]
Signed-off-by: Jani Nikula <[e-mail]>

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

···
 }
 
 /* returns true if intel_display_reset_finish() needs to be called */
-bool intel_display_reset_prepare(struct intel_display *display)
+bool intel_display_reset_prepare(struct intel_display *display,
+				 modeset_stuck_fn modeset_stuck, void *context)
 {
-	struct drm_i915_private *dev_priv = to_i915(display->drm);
 	struct drm_modeset_acquire_ctx *ctx = &display->restore.reset_ctx;
 	struct drm_atomic_state *state;
 	int ret;
···
 	if (atomic_read(&display->restore.pending_fb_pin)) {
 		drm_dbg_kms(display->drm,
 			    "Modeset potentially stuck, unbreaking through wedging\n");
-		intel_gt_set_wedged(to_gt(dev_priv));
+		modeset_stuck(context);
 	}
 
 	/*

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

···
 
 struct intel_display;
 
+typedef void modeset_stuck_fn(void *context);
+
 bool intel_display_reset_test(struct intel_display *display);
-bool intel_display_reset_prepare(struct intel_display *display);
+bool 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);
 
 #endif /* __INTEL_RESET_H__ */

drivers/gpu/drm/i915/gt/intel_reset.c

···
 	return err;
 }
 
+static void display_reset_modeset_stuck(void *gt)
+{
+	intel_gt_set_wedged(gt);
+}
+
 static void intel_gt_reset_global(struct intel_gt *gt,
 				  u32 engine_mask,
 				  const char *reason)
···
 			need_display_reset;
 
 		if (reset_display)
-			reset_display = intel_display_reset_prepare(display);
+			reset_display = intel_display_reset_prepare(display,
+								    display_reset_modeset_stuck,
+								    gt);
 
 		intel_gt_reset(gt, engine_mask, reason);