On Tue, Nov 06, 2018 at 04:31:20PM -0800, Anusha Srivatsa wrote:
> If the panel supports FEC, the driver has to
> set the FEC_READY bit in the dpcd register:
> FEC_CONFIGURATION.
> 
> This has to happen before link training.
> 
> v2: s/intel_dp_set_fec_ready/intel_dp_sink_set_fec_ready
>    - change commit message. (Gaurav)
> 
> v3: rebased. (r-b Manasi)
> 
> v4: Use fec crtc state, before setting FEC_READY
> bit. (Anusha)
> 
> v5: Move to intel_ddi.c
> - Make the function static (Anusha)
> 
> v6: Dont pass state as a separate argument (Ville)
> 
> Cc: dri-devel@lists.freedesktop.org
> Cc: Gaurav K Singh <gaurav.k.si...@intel.com>
> Cc: Jani Nikula <jani.nik...@linux.intel.com>
> Cc: Ville Syrjala <ville.syrj...@linux.intel.com>
> Cc: Manasi Navare <manasi.d.nav...@intel.com>
> Signed-off-by: Anusha Srivatsa <anusha.sriva...@intel.com>

Reviewed-by: Manasi Navare <manasi.d.nav...@intel.com>

Manasi

> ---
>  drivers/gpu/drm/i915/intel_ddi.c | 11 +++++++++++
>  1 file changed, 11 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/intel_ddi.c 
> b/drivers/gpu/drm/i915/intel_ddi.c
> index 46c1b9e12fbd..850c16200759 100644
> --- a/drivers/gpu/drm/i915/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/intel_ddi.c
> @@ -3051,6 +3051,16 @@ static void icl_program_mg_dp_mode(struct 
> intel_digital_port *intel_dig_port)
>       I915_WRITE(MG_DP_MODE(port, 1), ln1);
>  }
>  
> +static void intel_dp_sink_set_fec_ready(struct intel_dp *intel_dp,
> +                                     const struct intel_crtc_state 
> *crtc_state)
> +{
> +     if (!crtc_state->fec_enable)
> +             return;
> +
> +     if (drm_dp_dpcd_writeb(&intel_dp->aux, DP_FEC_CONFIGURATION, 
> DP_FEC_READY) <= 0)
> +             DRM_DEBUG_KMS("Failed to get FEC enabled in sink\n");
> +}
> +
>  static void intel_ddi_pre_enable_dp(struct intel_encoder *encoder,
>                                   const struct intel_crtc_state *crtc_state,
>                                   const struct drm_connector_state 
> *conn_state)
> @@ -3091,6 +3101,7 @@ static void intel_ddi_pre_enable_dp(struct 
> intel_encoder *encoder,
>               intel_dp_sink_dpms(intel_dp, DRM_MODE_DPMS_ON);
>       intel_dp_sink_set_decompression_state(intel_dp, crtc_state,
>                                             true);
> +     intel_dp_sink_set_fec_ready(intel_dp, crtc_state);
>       intel_dp_start_link_train(intel_dp);
>       if (port != PORT_A || INTEL_GEN(dev_priv) >= 9)
>               intel_dp_stop_link_train(intel_dp);
> -- 
> 2.19.1
> 
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