Re: [Intel-gfx] [PATCH 06/16] drm/i915: Extract icl_combo_phy_loadgen_select()

[Jani Nikula <jani.nikula@linux.intel.com>]

On Wed, 06 Oct 2021, Ville Syrjala <ville.syrjala@linux.intel.com> wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
>
> Pull the convoluted loadgen calculation into a small helper.
>
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jani Nikula <jani.nikula@intel.com>


> ---
>  drivers/gpu/drm/i915/display/intel_ddi.c | 23 ++++++++++++++---------
>  1 file changed, 14 insertions(+), 9 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_ddi.c b/drivers/gpu/drm/i915/display/intel_ddi.c
> index b8ec53d9e3b0..d06c76694a08 100644
> --- a/drivers/gpu/drm/i915/display/intel_ddi.c
> +++ b/drivers/gpu/drm/i915/display/intel_ddi.c
> @@ -1023,6 +1023,18 @@ static u8 intel_ddi_dp_preemph_max(struct intel_dp *intel_dp)
>  	return DP_TRAIN_PRE_EMPH_LEVEL_3;
>  }
>  
> +static u32 icl_combo_phy_loadgen_select(const struct intel_crtc_state *crtc_state,
> +					int lane)
> +{
> +	if (crtc_state->port_clock > 600000)
> +		return 0;
> +
> +	if (crtc_state->lane_count == 4)
> +		return lane >= 1 ? LOADGEN_SELECT : 0;
> +	else
> +		return lane == 1 || lane == 2 ? LOADGEN_SELECT : 0;
> +}
> +
>  static void icl_ddi_combo_vswing_program(struct intel_encoder *encoder,
>  					 const struct intel_crtc_state *crtc_state)
>  {
> @@ -1089,11 +1101,8 @@ static void icl_combo_phy_set_signal_levels(struct intel_encoder *encoder,
>  {
>  	struct drm_i915_private *dev_priv = to_i915(encoder->base.dev);
>  	enum phy phy = intel_port_to_phy(dev_priv, encoder->port);
> -	int width, rate, ln;
>  	u32 val;
> -
> -	width = crtc_state->lane_count;
> -	rate = crtc_state->port_clock;
> +	int ln;
>  
>  	/*
>  	 * 1. If port type is eDP or DP,
> @@ -1117,11 +1126,7 @@ static void icl_combo_phy_set_signal_levels(struct intel_encoder *encoder,
>  	for (ln = 0; ln < 4; ln++) {
>  		val = intel_de_read(dev_priv, ICL_PORT_TX_DW4_LN(ln, phy));
>  		val &= ~LOADGEN_SELECT;
> -
> -		if ((rate <= 600000 && width == 4 && ln >= 1) ||
> -		    (rate <= 600000 && width < 4 && (ln == 1 || ln == 2))) {
> -			val |= LOADGEN_SELECT;
> -		}
> +		val |= icl_combo_phy_loadgen_select(crtc_state, ln);
>  		intel_de_write(dev_priv, ICL_PORT_TX_DW4_LN(ln, phy), val);
>  	}

-- 
Jani Nikula, Intel Open Source Graphics Center