Re: [Intel-gfx] [PATCH v5 2/4] drm/i915/gen9_bc: Introduce TGP PCH DDC pin mappings

[Rodrigo Vivi]

On Tue, Feb 09, 2021 at 04:28:29PM -0500, Lyude Paul wrote:
> With the introduction of gen9_bc, where Intel combines Cometlake CPUs with
> a Tigerpoint PCH, we'll need to introduce new DDC pin mappings for this
> platform in order to make all of the display connectors work. So, let's do
> that.
> 
> Changes since v4:
> * Split this into it's own patch - vsyrjala
> 
> Cc: Matt Roper <matthew.d.roper@xxxxxxxxx>
> Cc: Jani Nikula <jani.nikula@xxxxxxxxxxxxxxx>
> Cc: Ville Syrjala <ville.syrjala@xxxxxxxxxxxxxxx>
> [originally from Tejas's work]
> Signed-off-by: Tejas Upadhyay <tejaskumarx.surendrakumar.upadhyay@xxxxxxxxx>
> Signed-off-by: Lyude Paul <lyude@xxxxxxxxxx>
> ---
>  drivers/gpu/drm/i915/display/intel_bios.c |  9 +++++++++
>  drivers/gpu/drm/i915/display/intel_hdmi.c | 20 ++++++++++++++++++++
>  2 files changed, 29 insertions(+)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_bios.c b/drivers/gpu/drm/i915/display/intel_bios.c
> index 7118530a1c38..1289f9d437e4 100644
> --- a/drivers/gpu/drm/i915/display/intel_bios.c
> +++ b/drivers/gpu/drm/i915/display/intel_bios.c
> @@ -1638,6 +1638,12 @@ static const u8 adls_ddc_pin_map[] = {
>  	[ADLS_DDC_BUS_PORT_TC4] = GMBUS_PIN_12_TC4_ICP,
>  };
>  
> +static const u8 gen9bc_tgp_ddc_pin_map[] = {
> +	[DDC_BUS_DDI_B] = GMBUS_PIN_2_BXT,
> +	[DDC_BUS_DDI_C] = GMBUS_PIN_9_TC1_ICP,
> +	[DDC_BUS_DDI_D] = GMBUS_PIN_10_TC2_ICP,
> +};
> +
>  static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
>  {
>  	const u8 *ddc_pin_map;
> @@ -1651,6 +1657,9 @@ static u8 map_ddc_pin(struct drm_i915_private *dev_priv, u8 vbt_pin)
>  	} else if (IS_ROCKETLAKE(dev_priv) && INTEL_PCH_TYPE(dev_priv) == PCH_TGP) {
>  		ddc_pin_map = rkl_pch_tgp_ddc_pin_map;
>  		n_entries = ARRAY_SIZE(rkl_pch_tgp_ddc_pin_map);
> +	} else if (HAS_PCH_TGP(dev_priv) && IS_GEN9_BC(dev_priv)) {
> +		ddc_pin_map = gen9bc_tgp_ddc_pin_map;
> +		n_entries = ARRAY_SIZE(gen9bc_tgp_ddc_pin_map);
>  	} else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP) {
>  		ddc_pin_map = icp_ddc_pin_map;
>  		n_entries = ARRAY_SIZE(icp_ddc_pin_map);
> diff --git a/drivers/gpu/drm/i915/display/intel_hdmi.c b/drivers/gpu/drm/i915/display/intel_hdmi.c
> index dad54e116bc4..49528d07c7f3 100644
> --- a/drivers/gpu/drm/i915/display/intel_hdmi.c
> +++ b/drivers/gpu/drm/i915/display/intel_hdmi.c
> @@ -3138,6 +3138,24 @@ static u8 rkl_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
>  	return GMBUS_PIN_1_BXT + phy;
>  }
>  
> +static u8 gen9bc_port_to_ddc_pin(struct drm_i915_private *i915, enum port port)
> +{
> +	enum phy phy = intel_port_to_phy(i915, port);
> +
> +	drm_WARN_ON(&i915->drm, port == PORT_A);
> +
> +	/*
> +	 * Pin mapping for GEN9 BC depends on which PCH is present.  With TGP,
> +	 * final two outputs use type-c pins, even though they're actually
> +	 * combo outputs.  With CMP, the traditional DDI A-D pins are used for
> +	 * all outputs.
> +	 */
> +	if (INTEL_PCH_TYPE(i915) >= PCH_TGP && phy >= PHY_C)
> +		return GMBUS_PIN_9_TC1_ICP + phy - PHY_C;
> +
> +	return GMBUS_PIN_1_BXT + phy;
> +}
> +
>  static u8 dg1_port_to_ddc_pin(struct drm_i915_private *dev_priv, enum port port)
>  {
>  	return intel_port_to_phy(dev_priv, port) + 1;
> @@ -3202,6 +3220,8 @@ static u8 intel_hdmi_ddc_pin(struct intel_encoder *encoder)
>  		ddc_pin = dg1_port_to_ddc_pin(dev_priv, port);
>  	else if (IS_ROCKETLAKE(dev_priv))
>  		ddc_pin = rkl_port_to_ddc_pin(dev_priv, port);
> +	else if (IS_GEN9_BC(dev_priv) && HAS_PCH_TGP(dev_priv))
> +		ddc_pin = gen9bc_port_to_ddc_pin(dev_priv, port);

what about also calling this function gen9bc_tgp_ ?

but up to you...
this version is much better without the if gen9 inside a "tgp" func...
thanks

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@xxxxxxxxx>

>  	else if (HAS_PCH_MCC(dev_priv))
>  		ddc_pin = mcc_port_to_ddc_pin(dev_priv, port);
>  	else if (INTEL_PCH_TYPE(dev_priv) >= PCH_ICP)
> -- 
> 2.29.2
> 
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