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From 8e75667d141c823d595bc3e4a0a47f285676a1a1 Mon Sep 17 00:00:00 2001
From: Yongqiang Sun <yongqiang.sun@amd.com>
Date: Thu, 18 Feb 2016 13:42:55 -0500
Subject: [PATCH 0812/1110] drm/amd/dal: Fixed HDMI-DVI dongle not light up
issue.
Signed-off-by: Yongqiang Sun <yongqiang.sun@amd.com>
Acked-by: Harry Wentland <harry.wentland@amd.com>
---
drivers/gpu/drm/amd/dal/dc/core/dc_resource.c | 11 +++++++++++
1 file changed, 11 insertions(+)
diff --git a/drivers/gpu/drm/amd/dal/dc/core/dc_resource.c b/drivers/gpu/drm/amd/dal/dc/core/dc_resource.c
index 5d9095e..18cddfd 100644
--- a/drivers/gpu/drm/amd/dal/dc/core/dc_resource.c
+++ b/drivers/gpu/drm/amd/dal/dc/core/dc_resource.c
@@ -747,6 +747,17 @@ static void set_stream_signal(struct pipe_ctx *pipe_ctx)
}
pipe_ctx->signal = dc_sink->sink_signal;
+
+ /* Down-grade pipe_ctx signal instead of sink singal from HDMI to DVI
+ * here based on audio info in stream. This allows DC to handle stream
+ * with or without audio on a HDMI connector.
+ *
+ * On a HDMI to DVI passive dongle, audio info is not available from the
+ * EDID and the signal is down-graded in pipe ctx.
+ */
+ if (pipe_ctx->signal == SIGNAL_TYPE_HDMI_TYPE_A &&
+ pipe_ctx->stream->public.audio_info.mode_count == 0)
+ pipe_ctx->signal = SIGNAL_TYPE_DVI_SINGLE_LINK;
}
enum dc_status map_resources(
--
2.7.4
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