[PATCH 26/26] drm/amd/display: Disable 4k 60 HDMI on DCE11

[Bhawanpreet Lakha]

From: David Francis <David.Francis at amd.com>

[Why]
Carrizo and Stoney have severe corruption when trying to power
4k 60 monitors over HDMI connectors that support 4k 60.

Carrizo and Stoney require retimers and redrivers to support 4k 60
over HDMI.  This driver does not currently support these.  Thus, 4k 60
HDMI (and all other modes requiring over 300MHz) should be disabled.

[How]
Reduce the dce11 HDMI pixel clock cap to 300000kHz.

Signed-off-by: David Francis <David.Francis at amd.com>
Reviewed-by: Roman Li <Roman.Li at amd.com>
Acked-by: Bhawanpreet Lakha <Bhawanpreet.Lakha at amd.com>
---
 drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
index c5714ebb9cea..1a90e1a38055 100644
--- a/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
+++ b/drivers/gpu/drm/amd/display/dc/dce110/dce110_resource.c
@@ -568,7 +568,7 @@ static struct input_pixel_processor *dce110_ipp_create(
 
 static const struct encoder_feature_support link_enc_feature = {
 		.max_hdmi_deep_color = COLOR_DEPTH_121212,
-		.max_hdmi_pixel_clock = 594000,
+		.max_hdmi_pixel_clock = 300000,
 		.flags.bits.IS_HBR2_CAPABLE = true,
 		.flags.bits.IS_TPS3_CAPABLE = true
 };
-- 
2.14.1