Re: [PATCH v2 8/14] drm/i915/dp: Move max. vswing check to it's own function

[Mika Kahola <mika.kahola@intel.com>]

On Tue, 2016-09-06 at 17:13 -0700, Manasi Navare wrote:
> From: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> 
> Wrap the max. vswing check in a separate function.
> This makes the clock recovery phase of DP link training cleaner
> 
> v2:
> Fixed the Compiler warning (Mika Kahola)
> 
> Signed-off-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
> Signed-off-by: Manasi Navare <manasi.d.navare@intel.com>
> ---
>  drivers/gpu/drm/i915/intel_dp_link_training.c | 17 +++++++++++++----
>  1 file changed, 13 insertions(+), 4 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp_link_training.c
> b/drivers/gpu/drm/i915/intel_dp_link_training.c
> index 0deebed..b1eee5b 100644
> --- a/drivers/gpu/drm/i915/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/intel_dp_link_training.c
> @@ -112,6 +112,18 @@ intel_dp_update_link_train(struct intel_dp
> *intel_dp)
>  	return ret == intel_dp->lane_count;
>  }
>  
> +static bool intel_dp_link_max_vswing_reached(struct intel_dp
> *intel_dp)
> +{
> +	int lane;
> +
> +	for (lane = 0; lane < intel_dp->lane_count; lane++)
> +		if (intel_dp->train_set[lane] &
> +		    (DP_TRAIN_MAX_SWING_REACHED == 0))
> +			return false;
It seems that the parenthesis a misplaced here. I think you meant 

	if ((intel_dp->train_set[lane] &
	     DP_TRAIN_MAX_SWING_REACHED) == 0)
 
 
> +
> +	return true;
> +}
> +
>  /* Enable corresponding port and start training pattern 1 */
>  static void
>  intel_dp_link_training_clock_recovery(struct intel_dp *intel_dp)
> @@ -170,10 +182,7 @@ intel_dp_link_training_clock_recovery(struct
> intel_dp *intel_dp)
>  		}
>  
>  		/* Check to see if we've tried the max voltage */
> -		for (i = 0; i < intel_dp->lane_count; i++)
> -			if ((intel_dp->train_set[i] &
> DP_TRAIN_MAX_SWING_REACHED) == 0)
> -				break;
> -		if (i == intel_dp->lane_count) {
> +		if (intel_dp_link_max_vswing_reached(intel_dp)) {
>  			++loop_tries;
>  			if (loop_tries == 5) {
>  				DRM_ERROR("too many full retries,
> give up\n");
-- 
Mika Kahola - Intel OTC

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