drm/amd/display: Disable 4k 60 HDMI on DCE11

[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 <[email protected]>
Reviewed-by: Roman Li <[email protected]>
Acked-by: Bhawanpreet Lakha <[email protected]>
Signed-off-by: Alex Deucher <[email protected]>

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 de190935f0a456000cbabbdcc723b7c1a43667b7..e3624ca24574827a684a3c96dc257b2a4c19f215 100644 (file)
--- 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
 };