Re: [PATCH 3/4] drm/i915: Clean up DDI DDC/AUX CH sanitation

[Jim Bride <jim.bride@linux.intel.com>]

On Tue, Oct 11, 2016 at 08:52:47PM +0300, ville.syrjala@linux.intel.com wrote:
> From: Ville Syrjälä <ville.syrjala@linux.intel.com>
> 
> Now that we use the AUX and GMBUS assignment from VBT for all ports,
> let's clean up the sanitization of the port information a bit.
> Previosuly we only did this for port E, and only complained about a
> non-standard assignment for the other ports. But as we know that
> non-standard assignments are a fact of life, let's expand the
> sanitization to all the ports.
> 
> v2: Include a commit message, fix up the comments a bit
> 
> Cc: stable@vger.kernel.org
> Cc: Maarten Maathuis <madman2003@gmail.com>
> Tested-by: Maarten Maathuis <madman2003@gmail.com>
> References: https://bugs.freedesktop.org/show_bug.cgi?id=97877
> Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>

Reviewed-by: Jim Bride <jim.bride@linux.intel.com>

> ---
>  drivers/gpu/drm/i915/intel_bios.c | 116 +++++++++++++++++++++++---------------
>  1 file changed, 71 insertions(+), 45 deletions(-)
> 
> diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
> index 83667e8cdd6b..6d1ffa815e97 100644
> --- a/drivers/gpu/drm/i915/intel_bios.c
> +++ b/drivers/gpu/drm/i915/intel_bios.c
> @@ -1035,6 +1035,71 @@ static u8 translate_iboost(u8 val)
>  	return mapping[val];
>  }
>  
> +static void sanitize_ddc_pin(struct drm_i915_private *dev_priv,
> +			     enum port port)
> +{
> +	const struct ddi_vbt_port_info *info =
> +		&dev_priv->vbt.ddi_port_info[port];
> +	enum port p;
> +
> +	for_each_port_masked(p, (1 << port) - 1) {
> +		struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
> +
> +		if (info->alternate_ddc_pin != i->alternate_ddc_pin)
> +			continue;
> +
> +		DRM_DEBUG_KMS("port %c trying to use the same DDC pin (0x%x) as port %c, "
> +			      "disabling port %c DVI/HDMI support\n",
> +			      port_name(p), i->alternate_ddc_pin,
> +			      port_name(port), port_name(p));
> +
> +		/*
> +		 * If we have multiple ports supposedly sharing the
> +		 * pin, then dvi/hdmi couldn't exist on the shared
> +		 * port. Otherwise they share the same ddc bin and
> +		 * system couldn't communicate with them separately.
> +		 *
> +		 * Due to parsing the ports in alphabetical order,
> +		 * a higher port will always clobber a lower one.
> +		 */
> +		i->supports_dvi = false;
> +		i->supports_hdmi = false;
> +		i->alternate_ddc_pin = 0;
> +	}
> +}
> +
> +static void sanitize_aux_ch(struct drm_i915_private *dev_priv,
> +			    enum port port)
> +{
> +	const struct ddi_vbt_port_info *info =
> +		&dev_priv->vbt.ddi_port_info[port];
> +	enum port p;
> +
> +	for_each_port_masked(p, (1 << port) - 1) {
> +		struct ddi_vbt_port_info *i = &dev_priv->vbt.ddi_port_info[p];
> +
> +		if (info->alternate_aux_channel != i->alternate_aux_channel)
> +			continue;
> +
> +		DRM_DEBUG_KMS("port %c trying to use the same AUX CH (0x%x) as port %c, "
> +			      "disabling port %c DP support\n",
> +			      port_name(p), i->alternate_aux_channel,
> +			      port_name(port), port_name(p));
> +
> +		/*
> +		 * If we have multiple ports supposedlt sharing the
> +		 * aux channel, then DP couldn't exist on the shared
> +		 * port. Otherwise they share the same aux channel
> +		 * and system couldn't communicate with them separately.
> +		 *
> +		 * Due to parsing the ports in alphabetical order,
> +		 * a higher port will always clobber a lower one.
> +		 */
> +		i->supports_dp = false;
> +		i->alternate_aux_channel = 0;
> +	}
> +}
> +
>  static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
>  			   const struct bdb_header *bdb)
>  {
> @@ -1109,54 +1174,15 @@ static void parse_ddi_port(struct drm_i915_private *dev_priv, enum port port,
>  		DRM_DEBUG_KMS("Port %c is internal DP\n", port_name(port));
>  
>  	if (is_dvi) {
> -		if (port == PORT_E) {
> -			info->alternate_ddc_pin = ddc_pin;
> -			/* if DDIE share ddc pin with other port, then
> -			 * dvi/hdmi couldn't exist on the shared port.
> -			 * Otherwise they share the same ddc bin and system
> -			 * couldn't communicate with them seperately. */
> -			if (ddc_pin == DDC_PIN_B) {
> -				dev_priv->vbt.ddi_port_info[PORT_B].supports_dvi = 0;
> -				dev_priv->vbt.ddi_port_info[PORT_B].supports_hdmi = 0;
> -			} else if (ddc_pin == DDC_PIN_C) {
> -				dev_priv->vbt.ddi_port_info[PORT_C].supports_dvi = 0;
> -				dev_priv->vbt.ddi_port_info[PORT_C].supports_hdmi = 0;
> -			} else if (ddc_pin == DDC_PIN_D) {
> -				dev_priv->vbt.ddi_port_info[PORT_D].supports_dvi = 0;
> -				dev_priv->vbt.ddi_port_info[PORT_D].supports_hdmi = 0;
> -			}
> -		} else if (ddc_pin == DDC_PIN_B && port != PORT_B)
> -			DRM_DEBUG_KMS("Unexpected DDC pin for port B\n");
> -		else if (ddc_pin == DDC_PIN_C && port != PORT_C)
> -			DRM_DEBUG_KMS("Unexpected DDC pin for port C\n");
> -		else if (ddc_pin == DDC_PIN_D && port != PORT_D)
> -			DRM_DEBUG_KMS("Unexpected DDC pin for port D\n");
> +		info->alternate_ddc_pin = ddc_pin;
> +
> +		sanitize_ddc_pin(dev_priv, port);
>  	}
>  
>  	if (is_dp) {
> -		if (port == PORT_E) {
> -			info->alternate_aux_channel = aux_channel;
> -			/* if DDIE share aux channel with other port, then
> -			 * DP couldn't exist on the shared port. Otherwise
> -			 * they share the same aux channel and system
> -			 * couldn't communicate with them seperately. */
> -			if (aux_channel == DP_AUX_A)
> -				dev_priv->vbt.ddi_port_info[PORT_A].supports_dp = 0;
> -			else if (aux_channel == DP_AUX_B)
> -				dev_priv->vbt.ddi_port_info[PORT_B].supports_dp = 0;
> -			else if (aux_channel == DP_AUX_C)
> -				dev_priv->vbt.ddi_port_info[PORT_C].supports_dp = 0;
> -			else if (aux_channel == DP_AUX_D)
> -				dev_priv->vbt.ddi_port_info[PORT_D].supports_dp = 0;
> -		}
> -		else if (aux_channel == DP_AUX_A && port != PORT_A)
> -			DRM_DEBUG_KMS("Unexpected AUX channel for port A\n");
> -		else if (aux_channel == DP_AUX_B && port != PORT_B)
> -			DRM_DEBUG_KMS("Unexpected AUX channel for port B\n");
> -		else if (aux_channel == DP_AUX_C && port != PORT_C)
> -			DRM_DEBUG_KMS("Unexpected AUX channel for port C\n");
> -		else if (aux_channel == DP_AUX_D && port != PORT_D)
> -			DRM_DEBUG_KMS("Unexpected AUX channel for port D\n");
> +		info->alternate_aux_channel = aux_channel;
> +
> +		sanitize_aux_ch(dev_priv, port);
>  	}
>  
>  	if (bdb->version >= 158) {
> -- 
> 2.7.4
> 
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