On Wed, Dec 04, 2019 at 12:55:09PM -0800, José Roberto de Souza wrote:
> For TGL the step to turn off the transcoder clock was moved to after
> the complete shutdown of DDI. Only the MST slave transcoders should
> disable the clock before that.
>
> v2:
> - Adding last_mst_stream to intel_mst_post_disable_dp, make code more
> easy to read and is similar to first_mst_stream in
> intel_mst_pre_enable_dp()(Ville's idea)
> - Calling intel_ddi_disable_pipe_clock() for GEN12+ right
> intel_disable_ddi_buf() as stated in BSpec(Ville)
>
> BSpec: 49190
> Cc: Lucas De Marchi <lucas.demar...@intel.com>
> Cc: Ville Syrjälä <ville.syrj...@linux.intel.com>
> Signed-off-by: José Roberto de Souza <jose.so...@intel.com>
> ---
> drivers/gpu/drm/i915/display/intel_ddi.c | 10 +++++++++-
> drivers/gpu/drm/i915/display/intel_dp_mst.c | 20 +++++++++++++++-----
> 2 files changed, 24 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index ebcc7302706b..3cacb1e279c1 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -3807,11 +3807,19 @@ static void intel_ddi_post_disable_dp(struct
> intel_encoder *encoder,
> */
> intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_OFF);
>
> - if (!is_mst)
> + if (INTEL_GEN(dev_priv) < 12 && !is_mst)
> intel_ddi_disable_pipe_clock(old_crtc_state);
>
> intel_disable_ddi_buf(encoder, old_crtc_state);
>
> + /*
> + * From TGL spec: "If single stream or multi-stream master transcoder:
> + * Configure Transcoder Clock select to direct no clock to the
> + * transcoder"
> + */
> + if (INTEL_GEN(dev_priv) >= 12)
> + intel_ddi_disable_pipe_clock(old_crtc_state);
> +
Memory is already a bit hazy, but yeah this seems like the right spot.
Reviewed-by: Ville Syrjälä <ville.syrj...@linux.intel.com>
> intel_edp_panel_vdd_on(intel_dp);
> intel_edp_panel_off(intel_dp);
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> index a1e4f4197a67..926e49f449a6 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_mst.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_mst.c
> @@ -235,8 +235,21 @@ static void intel_mst_post_disable_dp(struct
> intel_encoder *encoder,
> struct intel_dp *intel_dp = &intel_dig_port->dp;
> struct intel_connector *connector =
> to_intel_connector(old_conn_state->connector);
> + struct drm_i915_private *dev_priv = to_i915(connector->base.dev);
> + bool last_mst_stream;
>
> - intel_ddi_disable_pipe_clock(old_crtc_state);
> + intel_dp->active_mst_links--;
> + last_mst_stream = intel_dp->active_mst_links == 0;
> +
> + /*
> + * From TGL spec: "If multi-stream slave transcoder: Configure
> + * Transcoder Clock Select to direct no clock to the transcoder"
> + *
> + * From older GENs spec: "Configure Transcoder Clock Select to direct
> + * no clock to the transcoder"
> + */
> + if (INTEL_GEN(dev_priv) < 12 || !last_mst_stream)
> + intel_ddi_disable_pipe_clock(old_crtc_state);
>
> /* this can fail */
> drm_dp_check_act_status(&intel_dp->mst_mgr);
> @@ -252,13 +265,10 @@ static void intel_mst_post_disable_dp(struct
> intel_encoder *encoder,
> drm_dp_send_power_updown_phy(&intel_dp->mst_mgr, connector->port,
> false);
>
> - intel_dp->active_mst_links--;
> -
> intel_mst->connector = NULL;
> - if (intel_dp->active_mst_links == 0) {
> + if (last_mst_stream)
> intel_dig_port->base.post_disable(&intel_dig_port->base,
> old_crtc_state, NULL);
> - }
>
> DRM_DEBUG_KMS("active links %d\n", intel_dp->active_mst_links);
> }
> --
> 2.24.0
--
Ville Syrjälä
Intel
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