[Intel-gfx] [PATCH v2 9/9] drm/i915: Allow per-lane drive settings with LTTPRs

[Imre Deak]

On Wed, Sep 29, 2021 at 07:55:25PM +0300, Ville Syrjala wrote:
> From: Ville Syrjälä <ville.syrjala at linux.intel.com>
> 
> LTTPRs should support per-lane drive settings I think, and even if
> they don't they should implement their own fallback logic to determine
> suitable common drive settings to use for all the lanes.
> 
> v2: Actually check the correct thing
> 
> Signed-off-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

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

> ---
>  drivers/gpu/drm/i915/display/intel_dp_link_training.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp_link_training.c b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> index f26c44a6b568..eeea6c73e218 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> @@ -304,7 +304,7 @@ static u8 intel_dp_phy_preemph_max(struct intel_dp *intel_dp,
>  static bool has_per_lane_signal_levels(struct intel_dp *intel_dp,
>  				       enum drm_dp_phy dp_phy)
>  {
> -	return false;
> +	return !intel_dp_phy_is_downstream_of_source(intel_dp, dp_phy);
>  }
>  
>  static u8 intel_dp_get_lane_adjust_train(struct intel_dp *intel_dp,
> -- 
> 2.32.0
>