Re: [Intel-gfx] [PATCH 4/5] drm/i915/dp: fix DG1 and RKL max source rates

[Imre Deak <imre.deak@intel.com>]

On Thu, Aug 12, 2021 at 11:18:05AM +0530, Animesh Manna wrote:
> From: Jani Nikula <jani.nikula@intel.com>
> 
> Combo phy is limited to 5.4 GHz on low-voltage SKUs, but both eDP and DP
> can do 8.1 GHz on combo phy.
> 
> Bspec: 49182, 49205, 49202
> 
> Cc: Imre Deak <imre.deak@intel.com>
> Signed-off-by: Jani Nikula <jani.nikula@intel.com>
> Signed-off-by: Animesh Manna <animesh.manna@intel.com>

Reviewed-by: Imre Deak <imre.deak@intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 16 +++++++++++++++-
>  1 file changed, 15 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index d27f29477713..e8d2d381c587 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -258,6 +258,18 @@ static int ehl_max_source_rate(struct intel_dp *intel_dp)
>  	return 810000;
>  }
>  
> +static int dg1_max_source_rate(struct intel_dp *intel_dp)
> +{
> +	struct intel_digital_port *dig_port = dp_to_dig_port(intel_dp);
> +	struct drm_i915_private *i915 = to_i915(dig_port->base.base.dev);
> +	enum phy phy = intel_port_to_phy(i915, dig_port->base.port);
> +
> +	if (intel_phy_is_combo(i915, phy) && is_low_voltage_sku(i915, phy))
> +		return 540000;
> +
> +	return 810000;
> +}
> +
>  static void
>  intel_dp_set_source_rates(struct intel_dp *intel_dp)
>  {
> @@ -290,7 +302,9 @@ intel_dp_set_source_rates(struct intel_dp *intel_dp)
>  	if (DISPLAY_VER(dev_priv) >= 11) {
>  		source_rates = icl_rates;
>  		size = ARRAY_SIZE(icl_rates);
> -		if (IS_JSL_EHL(dev_priv))
> +		if (IS_DG1(dev_priv) || IS_ROCKETLAKE(dev_priv))
> +			max_rate = dg1_max_source_rate(intel_dp);
> +		else if (IS_JSL_EHL(dev_priv))
>  			max_rate = ehl_max_source_rate(intel_dp);
>  		else
>  			max_rate = icl_max_source_rate(intel_dp);
> -- 
> 2.29.0
>