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@xxxxxxxxxxxxxxxxxxxxx
> Cc: Gaurav K Singh <gaurav.k.singh@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> Cc: Manasi Navare <manasi.d.navare@xxxxxxxxx>
> Signed-off-by: Anusha Srivatsa <anusha.srivatsa@xxxxxxxxx>
Reviewed-by: Manasi Navare <manasi.d.navare@xxxxxxxxx>
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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