add new system file

hc

2024-02-20 102a0743326a03cd1a1202ceda21e175b7d3575c

 kernel/drivers/gpu/drm/drm_atomic_helper.c
..
..
@@ -1113,7 +1113,16 @@
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 			continue;
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 		ret = drm_crtc_vblank_get(crtc);
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-		WARN_ONCE(ret != -EINVAL, "driver forgot to call drm_crtc_vblank_off()\n");
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+		/*
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+		 * Self-refresh is not a true "disable"; ensure vblank remains
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+		 * enabled.
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+		 */
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+		if (new_crtc_state->self_refresh_active)
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+			WARN_ONCE(ret != 0,
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+				  "driver disabled vblank in self-refresh\n");
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+		else
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+			WARN_ONCE(ret != -EINVAL,
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+				  "driver forgot to call drm_crtc_vblank_off()\n");
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 		if (ret == 0)
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 			drm_crtc_vblank_put(crtc);
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 	}