On Wed, 2020-02-05 at 10:29 +0200, Jani Nikula wrote:
> Commit 21fd23ac222f ("drm/i915: move pipe, pch and vblank enable to
> encoders on DDI platforms") pushed pipe and vblank enable to encoders
> on
> DDI platforms, however it missed the DP MST encoder. Fix it.
>
> Fixes: 21fd23ac222f ("drm/i915: move pipe, pch and vblank enable to
> encoders on DDI platforms")
> Cc: Vandita Kulkarni <vandita.kulkarni@xxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Reported-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
> Signed-off-by: Jani Nikula <jani.nikula@xxxxxxxxx>
> ---
> drivers/gpu/drm/i915/display/intel_dp_mst.c | 6 ++++++
> 1 file changed, 6 insertions(+)
Checked, seems to fix my displays, so
Reviewed-by: Stanislav Lisovskiy <stanislav.lisovskiy@xxxxxxxxx>
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index b8aee506d595..9cd59141953d 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -491,6 +491,12 @@ static void intel_mst_enable_dp(struct
> intel_encoder *encoder,
> struct intel_dp *intel_dp = &intel_dig_port->dp;
> struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>
> + drm_WARN_ON(&dev_priv->drm, pipe_config->has_pch_encoder);
> +
> + intel_enable_pipe(pipe_config);
> +
> + intel_crtc_vblank_on(pipe_config);
> +
> DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
>
> if (intel_de_wait_for_set(dev_priv, intel_dp-
> >regs.dp_tp_status,
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