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2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/gpu/drm/amd/display/include/dpcd_defs.h
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@@ -43,7 +43,7 @@
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 enum dpcd_downstream_port_type {
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 	DOWNSTREAM_DP = 0,
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 	DOWNSTREAM_VGA,
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-	DOWNSTREAM_DVI_HDMI,
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+	DOWNSTREAM_DVI_HDMI_DP_PLUS_PLUS,/* DVI, HDMI, DP++ */
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 	DOWNSTREAM_NONDDC /* has no EDID (TV,CV) */
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 };
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@@ -149,4 +149,12 @@
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 	PSR_SINK_STATE_SINK_INTERNAL_ERROR = 7,
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 };
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+#define DP_SOURCE_TABLE_REVISION	    0x310
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+#define DP_SOURCE_PAYLOAD_SIZE		    0x311
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+#define DP_SOURCE_SINK_CAP		    0x317
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+#define DP_SOURCE_BACKLIGHT_LEVEL	    0x320
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+#define DP_SOURCE_BACKLIGHT_CURRENT_PEAK    0x326
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+#define DP_SOURCE_BACKLIGHT_CONTROL	    0x32E
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+#define DP_SOURCE_BACKLIGHT_ENABLE	    0x32F
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+
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 #endif /* __DAL_DPCD_DEFS_H__ */