[Intel-gfx] [PATCH 3/4] drm/i915: Introduce .set_idle_link_train() vfunc

[Souza, Jose]

On Mon, 2020-04-20 at 23:06 +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> Relocate a binch of DDI specific code from intel_dp.c to intel_ddi.c

bunch

> by introducing a .set_idle_link_train() vfunc.
> 

Reviewed-by: José Roberto de Souza <jose.souza at intel.com>

> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c      | 29
> +++++++++++++++++++
>  .../drm/i915/display/intel_display_types.h    |  1 +
>  drivers/gpu/drm/i915/display/intel_dp.c       | 29 ++---------------
> --
>  3 files changed, 32 insertions(+), 27 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c
> b/drivers/gpu/drm/i915/display/intel_ddi.c
> index eb420069a469..ad172a38ea38 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -4017,6 +4017,34 @@ static void intel_ddi_set_link_train(struct
> intel_dp *intel_dp,
>  	intel_de_posting_read(dev_priv, DDI_BUF_CTL(port));
>  }
>  
> +static void intel_ddi_set_idle_link_train(struct intel_dp *intel_dp)
> +{
> +	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)-
> >base;
> +	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
> +	enum port port = encoder->port;
> +	u32 val;
> +
> +	val = intel_de_read(dev_priv, intel_dp->regs.dp_tp_ctl);
> +	val &= ~DP_TP_CTL_LINK_TRAIN_MASK;
> +	val |= DP_TP_CTL_LINK_TRAIN_IDLE;
> +	intel_de_write(dev_priv, intel_dp->regs.dp_tp_ctl, val);
> +
> +	/*
> +	 * Until TGL on PORT_A we can have only eDP in SST mode. There
> the only
> +	 * reason we need to set idle transmission mode is to work
> around a HW
> +	 * issue where we enable the pipe while not in idle link-
> training mode.
> +	 * In this case there is requirement to wait for a minimum
> number of
> +	 * idle patterns to be sent.
> +	 */
> +	if (port == PORT_A && INTEL_GEN(dev_priv) < 12)
> +		return;
> +
> +	if (intel_de_wait_for_set(dev_priv, intel_dp-
> >regs.dp_tp_status,
> +				  DP_TP_STATUS_IDLE_DONE, 1))
> +		drm_err(&dev_priv->drm,
> +			"Timed out waiting for DP idle patterns\n");
> +}
> +
>  static bool intel_ddi_is_audio_enabled(struct drm_i915_private
> *dev_priv,
>  				       enum transcoder cpu_transcoder)
>  {
> @@ -4462,6 +4490,7 @@ intel_ddi_init_dp_connector(struct
> intel_digital_port *intel_dig_port)
>  	intel_dig_port->dp.prepare_link_retrain =
>  		intel_ddi_prepare_link_retrain;
>  	intel_dig_port->dp.set_link_train = intel_ddi_set_link_train;
> +	intel_dig_port->dp.set_idle_link_train =
> intel_ddi_set_idle_link_train;
>  
>  	if (INTEL_GEN(dev_priv) >= 12)
>  		intel_dig_port->dp.set_signal_levels =
> tgl_set_signal_levels;
> diff --git a/drivers/gpu/drm/i915/display/intel_display_types.h
> b/drivers/gpu/drm/i915/display/intel_display_types.h
> index 960ba14f01c8..35dc1483f330 100644
> --- a/drivers/gpu/drm/i915/display/intel_display_types.h
> +++ b/drivers/gpu/drm/i915/display/intel_display_types.h
> @@ -1369,6 +1369,7 @@ struct intel_dp {
>  	/* This is called before a link training is starterd */
>  	void (*prepare_link_retrain)(struct intel_dp *intel_dp);
>  	void (*set_link_train)(struct intel_dp *intel_dp, u8
> dp_train_pat);
> +	void (*set_idle_link_train)(struct intel_dp *intel_dp);
>  	void (*set_signal_levels)(struct intel_dp *intel_dp);
>  
>  	/* Displayport compliance testing */
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c
> b/drivers/gpu/drm/i915/display/intel_dp.c
> index 7d5e1e857ba7..d7fcf1026c97 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -4385,33 +4385,8 @@ intel_dp_program_link_training_pattern(struct
> intel_dp *intel_dp,
>  
>  void intel_dp_set_idle_link_train(struct intel_dp *intel_dp)
>  {
> -	struct drm_i915_private *dev_priv = dp_to_i915(intel_dp);
> -	struct intel_digital_port *intel_dig_port =
> dp_to_dig_port(intel_dp);
> -	enum port port = intel_dig_port->base.port;
> -	u32 val;
> -
> -	if (!HAS_DDI(dev_priv))
> -		return;
> -
> -	val = intel_de_read(dev_priv, intel_dp->regs.dp_tp_ctl);
> -	val &= ~DP_TP_CTL_LINK_TRAIN_MASK;
> -	val |= DP_TP_CTL_LINK_TRAIN_IDLE;
> -	intel_de_write(dev_priv, intel_dp->regs.dp_tp_ctl, val);
> -
> -	/*
> -	 * Until TGL on PORT_A we can have only eDP in SST mode. There
> the only
> -	 * reason we need to set idle transmission mode is to work
> around a HW
> -	 * issue where we enable the pipe while not in idle link-
> training mode.
> -	 * In this case there is requirement to wait for a minimum
> number of
> -	 * idle patterns to be sent.
> -	 */
> -	if (port == PORT_A && INTEL_GEN(dev_priv) < 12)
> -		return;
> -
> -	if (intel_de_wait_for_set(dev_priv, intel_dp-
> >regs.dp_tp_status,
> -				  DP_TP_STATUS_IDLE_DONE, 1))
> -		drm_err(&dev_priv->drm,
> -			"Timed out waiting for DP idle patterns\n");
> +	if (intel_dp->set_idle_link_train)
> +		intel_dp->set_idle_link_train(intel_dp);
>  }
>  
>  static void