[PATCH 75/81] drm/amd/display: fix DVI connected to HDMI connector max tmds clock

[sunpeng.li at amd.com]

From: Charlene Liu <charlene.liu at amd.com>

Change-Id: If1f43f6c7f8ed8485fcc1bda83933dedb4d76ef1
Signed-off-by: Charlene Liu <charlene.liu at amd.com>
Reviewed-by: Dmytro Laktyushkin <Dmytro.Laktyushkin at amd.com>
Acked-by: Harry Wentland <Harry.Wentland at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
index 812c299..5663d3d 100644
--- a/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
+++ b/drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c
@@ -830,6 +830,12 @@ bool dce110_link_encoder_validate_dvi_output(
 	if (crtc_timing->pixel_encoding != PIXEL_ENCODING_RGB)
 		return false;
 
+	/*connect DVI via adpater's HDMI connector*/
+	if ((connector_signal == SIGNAL_TYPE_DVI_SINGLE_LINK ||
+		connector_signal == SIGNAL_TYPE_HDMI_TYPE_A) &&
+		signal != SIGNAL_TYPE_HDMI_TYPE_A &&
+		crtc_timing->pix_clk_khz > TMDS_MAX_PIXEL_CLOCK)
+		return false;
 	if (crtc_timing->pix_clk_khz < TMDS_MIN_PIXEL_CLOCK)
 		return false;
 
-- 
2.7.4