Re: [PATCH 1/3] drm/i915/icl: Add a debug print for TypeC port disconnection

[Rodrigo Vivi <rodrigo.vivi@intel.com>]

On Thu, Dec 13, 2018 at 09:48:48PM +0200, Imre Deak wrote:
> It's useful to see at which point a TypeC port gets disconnected, so add
> add a debug print for it.
> 
> Cc: Paulo Zanoni <paulo.r.zanoni@intel.com>
> Cc: Ville Syrjälä <ville.syrjala@linux.intel.com>
> Cc: José Roberto de Souza <jose.souza@intel.com>
> Cc: Rodrigo Vivi <rodrigo.vivi@intel.com>
> Signed-off-by: Imre Deak <imre.deak@intel.com>

Reviewed-by: Rodrigo Vivi <rodrigo.vivi@intel.com>

> ---
>  drivers/gpu/drm/i915/intel_dp.c | 34 ++++++++++++++++++++++++----------
>  1 file changed, 24 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_dp.c b/drivers/gpu/drm/i915/intel_dp.c
> index e94faa0a42eb..082594bb65a7 100644
> --- a/drivers/gpu/drm/i915/intel_dp.c
> +++ b/drivers/gpu/drm/i915/intel_dp.c
> @@ -5066,28 +5066,38 @@ static bool icl_combo_port_connected(struct drm_i915_private *dev_priv,
>  	return I915_READ(SDEISR) & SDE_DDI_HOTPLUG_ICP(port);
>  }
>  
> +static const char *tc_type_name(enum tc_port_type type)
> +{
> +	static const char *names[] = {
> +		[TC_PORT_UNKNOWN] = "unknown",
> +		[TC_PORT_LEGACY] = "legacy",
> +		[TC_PORT_TYPEC] = "typec",
> +		[TC_PORT_TBT] = "tbt",
> +	};
> +
> +	if (WARN_ON(type >= ARRAY_SIZE(names)))
> +		type = TC_PORT_UNKNOWN;
> +
> +	return names[type];
> +}
> +
>  static void icl_update_tc_port_type(struct drm_i915_private *dev_priv,
>  				    struct intel_digital_port *intel_dig_port,
>  				    bool is_legacy, bool is_typec, bool is_tbt)
>  {
>  	enum port port = intel_dig_port->base.port;
>  	enum tc_port_type old_type = intel_dig_port->tc_type;
> -	const char *type_str;
>  
>  	WARN_ON(is_legacy + is_typec + is_tbt != 1);
>  
> -	if (is_legacy) {
> +	if (is_legacy)
>  		intel_dig_port->tc_type = TC_PORT_LEGACY;
> -		type_str = "legacy";
> -	} else if (is_typec) {
> +	else if (is_typec)
>  		intel_dig_port->tc_type = TC_PORT_TYPEC;
> -		type_str = "typec";
> -	} else if (is_tbt) {
> +	else if (is_tbt)
>  		intel_dig_port->tc_type = TC_PORT_TBT;
> -		type_str = "tbt";
> -	} else {
> +	else
>  		return;
> -	}
>  
>  	/* Types are not supposed to be changed at runtime. */
>  	WARN_ON(old_type != TC_PORT_UNKNOWN &&
> @@ -5095,7 +5105,7 @@ static void icl_update_tc_port_type(struct drm_i915_private *dev_priv,
>  
>  	if (old_type != intel_dig_port->tc_type)
>  		DRM_DEBUG_KMS("Port %c has TC type %s\n", port_name(port),
> -			      type_str);
> +			      tc_type_name(intel_dig_port->tc_type));
>  }
>  
>  static void icl_tc_phy_disconnect(struct drm_i915_private *dev_priv,
> @@ -5187,6 +5197,10 @@ static void icl_tc_phy_disconnect(struct drm_i915_private *dev_priv,
>  		I915_WRITE(PORT_TX_DFLEXDPCSSS, val);
>  	}
>  
> +	DRM_DEBUG_KMS("Port %c TC type %s disconnected\n",
> +		      port_name(dig_port->base.port),
> +		      tc_type_name(dig_port->tc_type));
> +
>  	dig_port->tc_type = TC_PORT_UNKNOWN;
>  }
>  
> -- 
> 2.13.2
> 
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