On 2018-11-27 3:52 a.m., S, Shirish wrote:
> This patch extends the below patch to apply DP signal type, for exactly
> the same reasons it was disabled for HDMI.
>
> "1a0e348 drm/amd/display: Disable 4k 60 HDMI on DCE11"
>
> Signed-off-by: Shirish S <shirish.s@xxxxxxx>
> ---
> drivers/gpu/drm/amd/display/dc/dce/dce_link_encoder.c | 4 ++++
> 1 file changed, 4 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 3e18ea8..d578828 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
> @@ -662,6 +662,10 @@ bool dce110_link_encoder_validate_dp_output(
> const struct dce110_link_encoder *enc110,
> const struct dc_crtc_timing *crtc_timing)
> {
> + if (crtc_timing->pix_clk_khz >
> + enc110->base.features.max_hdmi_pixel_clock)
> + return false;
> +
It doesn't make sense to look at the max hdmi pixel for DP.
If we want to restrict the supported timings we should also make sure they only apply to Stoney and/or Carrizo. That said, are you sure 4k60 is an issue on all CZ/ST boards or is this particular to a certain platform?
Harry
> if (crtc_timing->pixel_encoding == PIXEL_ENCODING_YCBCR420)
> return false;
>
>
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