Re: [PATCH v9 22/24] drm/i915/fec: Set FEC_READY in FEC_CONFIGURATION

[Manasi Navare <manasi.d.navare@intel.com>]

On Mon, Nov 19, 2018 at 10:19:42PM +0200, Ville Syrjälä wrote:
> On Tue, Nov 13, 2018 at 05:52:30PM -0800, Manasi Navare wrote:
> > From: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > 
> > 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.singh@intel.com>
> > Cc: Jani Nikula <jani.nikula@linux.intel.com>
> > Cc: Ville Syrjala <ville.syrjala@linux.intel.com>
> > Cc: Manasi Navare <manasi.d.navare@intel.com>
> > Signed-off-by: Anusha Srivatsa <anusha.srivatsa@intel.com>
> > Reviewed-by: Manasi Navare <manasi.d.navare@intel.com>
> > ---
> >  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 0638fd2febfb..2d15520f13c5 100644
> > --- a/drivers/gpu/drm/i915/intel_ddi.c
> > +++ b/drivers/gpu/drm/i915/intel_ddi.c
> > @@ -3102,6 +3102,16 @@ 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");
> 
> The debug message is still bonkers.

Havent we always had a debug print on drm_dp_dpcd_write() calls?

Manasi

> 
> > +}
> > +
> >  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)
> > @@ -3142,6 +3152,7 @@ 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
> 
> -- 
> Ville Syrjälä
> Intel
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