[PATCH 3/3] drm/i915/edp: eDP Data Overrride

[Jani Nikula]

On Fri, 25 Jul 2025, Suraj Kandpal <suraj.kandpal at intel.com> wrote:
> We need override certain link rates in favour of the next available
> higher link rate. The Link rates that need to be overridden are
> indicated by a mask in VBT. To make sure these modes are skipped we
> don't add them in them in the sink rates array.
>
> --v2
> -Update the link rates after we have a final set of link rates [Ankit]
> -Break this patch up [Ankit]
> -Optimize the assingment during loop [Ankit]
>
> Signed-off-by: Suraj Kandpal <suraj.kandpal at intel.com>
> ---
>  drivers/gpu/drm/i915/display/intel_dp.c | 19 +++++++++++++++++++
>  1 file changed, 19 insertions(+)
>
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 54d88f24b689..040344949b8f 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -4277,6 +4277,23 @@ static void intel_edp_mso_init(struct intel_dp *intel_dp)
>  	intel_dp->mso_pixel_overlap = mso ? info->mso_pixel_overlap : 0;
>  }
>  
> +static void
> +intel_edp_set_data_override_rates(struct intel_dp *intel_dp)
> +{
> +	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
> +	int *sink_rates = intel_dp->sink_rates;
> +	int i, j = 0;
> +
> +	for (i = 0; i < intel_dp->num_sink_rates; i++) {
> +		if (intel_bios_need_edp_data_override(encoder->devdata,
> +						      intel_dp->sink_rates[i]))
> +			continue;
> +
> +		sink_rates[j++] = intel_dp->sink_rates[i];
> +	}
> +	intel_dp->num_sink_rates = j;
> +}
> +
>  static void
>  intel_edp_set_sink_rates(struct intel_dp *intel_dp)
>  {
> @@ -4327,6 +4344,8 @@ intel_edp_set_sink_rates(struct intel_dp *intel_dp)
>  		intel_dp->use_rate_select = true;
>  	else
>  		intel_dp_set_sink_rates(intel_dp);
> +
> +	intel_edp_set_data_override_rates(intel_dp);

This can lead to no rates with a broken VBT, and so far we've taken care
to always have the fallback in there.

BR,
Jani.

>  }
>  
>  static bool

-- 
Jani Nikula, Intel