[Intel-gfx] [PATCH 1/2] drm/i915/dp: Generalize intel_dp_link_params function to accept arguments to be validated

[Jani Nikula]

On Fri, 02 Jun 2017, Manasi Navare <manasi.d.navare at intel.com> wrote:
> This function now takes the link rate and lane ocunt to be validated
> as an argument so that this can be used for validating even the
> compliance test link parameters.
>
> Signed-off-by: Manasi Navare <manasi.d.navare at intel.com>
> Cc: Ville Syrjala <ville.syrjala at linux.intel.com>
> Cc: Jani Nikula <jani.nikula at linux.intel.com>

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

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 14 ++++++++------
>  1 file changed, 8 insertions(+), 6 deletions(-)
>
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index 58dca87..832786d 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -322,19 +322,20 @@ static int intel_dp_common_len_rate_limit(struct intel_dp *intel_dp,
>  	return 0;
>  }
>  
> -static bool intel_dp_link_params_valid(struct intel_dp *intel_dp)
> +static bool intel_dp_link_params_valid(struct intel_dp *intel_dp, int link_rate,
> +				       uint8_t lane_count)
>  {
>  	/*
>  	 * FIXME: we need to synchronize the current link parameters with
>  	 * hardware readout. Currently fast link training doesn't work on
>  	 * boot-up.
>  	 */
> -	if (intel_dp->link_rate == 0 ||
> -	    intel_dp->link_rate > intel_dp->max_link_rate)
> +	if (link_rate == 0 ||
> +	    link_rate > intel_dp->max_link_rate)
>  		return false;
>  
> -	if (intel_dp->lane_count == 0 ||
> -	    intel_dp->lane_count > intel_dp_max_lane_count(intel_dp))
> +	if (lane_count == 0 ||
> +	    lane_count > intel_dp_max_lane_count(intel_dp))
>  		return false;
>  
>  	return true;
> @@ -4260,7 +4261,8 @@ intel_dp_check_link_status(struct intel_dp *intel_dp)
>  	 * Validate the cached values of intel_dp->link_rate and
>  	 * intel_dp->lane_count before attempting to retrain.
>  	 */
> -	if (!intel_dp_link_params_valid(intel_dp))
> +	if (!intel_dp_link_params_valid(intel_dp, intel_dp->link_rate,
> +					intel_dp->lane_count))
>  		return;
>  
>  	/* Retrain if Channel EQ or CR not ok */

-- 
Jani Nikula, Intel Open Source Technology Center