[Intel-gfx] [PATCH v2 08/12] drm/i915/dp: Convert link training error to debug message on disconnected sink

[Ville Syrjälä]

On Thu, May 04, 2023 at 02:10:44AM +0300, Imre Deak wrote:
> If a sink is disconnected it's expected that link training actions will
> fail on it, so downgrade the error messages about such actions to be a
> debug message. Such - expected - link training failures are more
> frequent after a follow up patch, after which an active TypeC link is
> reset after the sink is disconnected which also involves a link
> training.
> 
> Signed-off-by: Imre Deak <imre.deak at intel.com>

Reviewed-by: Ville Syrjälä <ville.syrjala at linux.intel.com>

> ---
>  drivers/gpu/drm/i915/display/intel_dp.c               |  2 +-
>  drivers/gpu/drm/i915/display/intel_dp.h               |  1 +
>  drivers/gpu/drm/i915/display/intel_dp_link_training.c | 11 +++++++++--
>  3 files changed, 11 insertions(+), 3 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.c b/drivers/gpu/drm/i915/display/intel_dp.c
> index 4361c1ac65c3a..1942a05719776 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp.c
> @@ -4179,7 +4179,7 @@ static int intel_dp_prep_link_retrain(struct intel_dp *intel_dp,
>  	return ret;
>  }
>  
> -static bool intel_dp_is_connected(struct intel_dp *intel_dp)
> +bool intel_dp_is_connected(struct intel_dp *intel_dp)
>  {
>  	struct intel_connector *connector = intel_dp->attached_connector;
>  
> diff --git a/drivers/gpu/drm/i915/display/intel_dp.h b/drivers/gpu/drm/i915/display/intel_dp.h
> index ef39e4f7a329e..488da392fafe5 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp.h
> +++ b/drivers/gpu/drm/i915/display/intel_dp.h
> @@ -42,6 +42,7 @@ void intel_dp_set_link_params(struct intel_dp *intel_dp,
>  			      int link_rate, int lane_count);
>  int intel_dp_get_link_train_fallback_values(struct intel_dp *intel_dp,
>  					    int link_rate, u8 lane_count);
> +bool intel_dp_is_connected(struct intel_dp *intel_dp);
>  int intel_dp_retrain_link(struct intel_encoder *encoder,
>  			  struct drm_modeset_acquire_ctx *ctx);
>  void intel_dp_set_power(struct intel_dp *intel_dp, u8 mode);
> 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 f83944eaac128..2fe076e2d64b3 100644
> --- a/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> +++ b/drivers/gpu/drm/i915/display/intel_dp_link_training.c
> @@ -33,6 +33,7 @@ static void lt_msg(struct intel_dp *intel_dp, enum drm_dp_phy dp_phy,
>  	struct drm_i915_private *i915 = dp_to_i915(intel_dp);
>  	struct intel_encoder *encoder = &dp_to_dig_port(intel_dp)->base;
>  	struct intel_connector *connector = intel_dp->attached_connector;
> +	const char *discon_str = "";
>  	struct va_format vaf;
>  	va_list args;
>  
> @@ -43,6 +44,11 @@ static void lt_msg(struct intel_dp *intel_dp, enum drm_dp_phy dp_phy,
>  	vaf.fmt = format;
>  	vaf.va = &args;
>  
> +	if (is_error && !intel_dp_is_connected(intel_dp)) {
> +		discon_str = " (sink disconnected)";
> +		is_error = false;
> +	}
> +
>  	if (is_error)
>  		drm_err(&i915->drm, "[CONNECTOR:%d:%s][ENCODER:%d:%s][%s] %pV\n",
>  			connector->base.base.id, connector->base.name,
> @@ -50,11 +56,12 @@ static void lt_msg(struct intel_dp *intel_dp, enum drm_dp_phy dp_phy,
>  			drm_dp_phy_name(dp_phy),
>  			&vaf);
>  	else
> -		drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s][ENCODER:%d:%s][%s] %pV\n",
> +		drm_dbg_kms(&i915->drm, "[CONNECTOR:%d:%s][ENCODER:%d:%s][%s] %pV%s\n",
>  			    connector->base.base.id, connector->base.name,
>  			    encoder->base.base.id, encoder->base.name,
>  			    drm_dp_phy_name(dp_phy),
> -			    &vaf);
> +			    &vaf,
> +			    discon_str);
>  }
>  
>  #define lt_err(intel_dp, dp_phy, format, ...) \
> -- 
> 2.37.2

-- 
Ville Syrjälä
Intel