Re: [Intel-gfx] [PATCH 1/2] drm: report dp downstream port type as a subconnector property

["Ville Syrjälä" <ville.syrjala@linux.intel.com>]

On Mon, Jul 01, 2019 at 11:00:21AM +0300, Oleg Vasilev wrote:
> Currently, downstream port type is only reported in debugfs. This
> information should be considered important since it reflects the actual
> physical connector type. Some userspace (e.g. window compositors)
> may want to show this info to a user.
> 
> The 'subconnector' property is already utilized for DVI-I and TV-out for
> reporting connector subtype.
> 
> The initial motivation for this feature came from i2c test [1].
> It is supposed to be skipped on VGA connectors, but it cannot
> detect VGA over DP and fails instead.
> 
> [1]: https://bugs.freedesktop.org/show_bug.cgi?id=104097
> Signed-off-by: Oleg Vasilev <oleg.vasilev@intel.com>
> ---
>  drivers/gpu/drm/drm_connector.c | 38 +++++++++++++++++++++++++++++++--
>  drivers/gpu/drm/drm_dp_helper.c | 36 +++++++++++++++++++++++++++++++
>  include/drm/drm_connector.h     |  2 ++
>  include/drm/drm_dp_helper.h     |  3 +++
>  include/drm/drm_mode_config.h   |  6 ++++++
>  include/uapi/drm/drm_mode.h     | 22 ++++++++++++-------
>  6 files changed, 97 insertions(+), 10 deletions(-)
> 
> diff --git a/drivers/gpu/drm/drm_connector.c b/drivers/gpu/drm/drm_connector.c
> index 068d4b05f1be..95cd51254be6 100644
> --- a/drivers/gpu/drm/drm_connector.c
> +++ b/drivers/gpu/drm/drm_connector.c
> @@ -793,7 +793,7 @@ static const struct drm_prop_enum_list drm_dvi_i_select_enum_list[] = {
>  DRM_ENUM_NAME_FN(drm_get_dvi_i_select_name, drm_dvi_i_select_enum_list)
>  
>  static const struct drm_prop_enum_list drm_dvi_i_subconnector_enum_list[] = {
> -	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
> +	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I, TV-out and DP */
>  	{ DRM_MODE_SUBCONNECTOR_DVID,      "DVI-D"     }, /* DVI-I  */
>  	{ DRM_MODE_SUBCONNECTOR_DVIA,      "DVI-A"     }, /* DVI-I  */
>  };
> @@ -810,7 +810,7 @@ static const struct drm_prop_enum_list drm_tv_select_enum_list[] = {
>  DRM_ENUM_NAME_FN(drm_get_tv_select_name, drm_tv_select_enum_list)
>  
>  static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
> -	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I and TV-out */
> +	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I, TV-out and DP */
>  	{ DRM_MODE_SUBCONNECTOR_Composite, "Composite" }, /* TV-out */
>  	{ DRM_MODE_SUBCONNECTOR_SVIDEO,    "SVIDEO"    }, /* TV-out */
>  	{ DRM_MODE_SUBCONNECTOR_Component, "Component" }, /* TV-out */
> @@ -819,6 +819,19 @@ static const struct drm_prop_enum_list drm_tv_subconnector_enum_list[] = {
>  DRM_ENUM_NAME_FN(drm_get_tv_subconnector_name,
>  		 drm_tv_subconnector_enum_list)
>  
> +static const struct drm_prop_enum_list drm_dp_subconnector_enum_list[] = {
> +	{ DRM_MODE_SUBCONNECTOR_Unknown,   "Unknown"   }, /* DVI-I, TV-out and DP */
> +	{ DRM_MODE_SUBCONNECTOR_VGA,	   "VGA"       }, /* DP */
> +	{ DRM_MODE_SUBCONNECTOR_DVI,	   "DVI"       }, /* DP */
> +	{ DRM_MODE_SUBCONNECTOR_HDMI,	   "HDMI"      }, /* DP */
> +	{ DRM_MODE_SUBCONNECTOR_DP,        "DP"        }, /* DP */
> +	{ DRM_MODE_SUBCONNECTOR_Wireless,  "Wireless"  }, /* DP */
> +	{ DRM_MODE_SUBCONNECTOR_Native,	   "Native"    }, /* DP */
> +};
> +
> +DRM_ENUM_NAME_FN(drm_get_dp_subconnector_name,
> +		 drm_dp_subconnector_enum_list)
> +
>  static const struct drm_prop_enum_list hdmi_colorspaces[] = {
>  	/* For Default case, driver will set the colorspace */
>  	{ DRM_MODE_COLORIMETRY_DEFAULT, "Default" },
> @@ -1128,6 +1141,27 @@ int drm_mode_create_dvi_i_properties(struct drm_device *dev)
>  }
>  EXPORT_SYMBOL(drm_mode_create_dvi_i_properties);
>  
> +/**
> + * drm_mode_create_dp_properties - create DP specific connector properties
> + * @dev: DRM device
> + *
> + * Called by a driver the first time a DP connector is made.
> + */
> +void drm_mode_create_dp_properties(struct drm_device *dev)
> +{
> +	struct drm_property *dp_subconnector;
> +
> +	if (dev->mode_config.dp_subconnector_property)
> +		return;
> +
> +	dp_subconnector = drm_property_create_enum(dev, DRM_MODE_PROP_IMMUTABLE,
> +						   "subconnector",
> +						   drm_dp_subconnector_enum_list,
> +						   ARRAY_SIZE(drm_dp_subconnector_enum_list));
> +	dev->mode_config.dp_subconnector_property = dp_subconnector;
> +}
> +EXPORT_SYMBOL(drm_mode_create_dp_properties);
> +
>  /**
>   * DOC: HDMI connector properties
>   *
> diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
> index 0b994d083a89..63d8f0b8492c 100644
> --- a/drivers/gpu/drm/drm_dp_helper.c
> +++ b/drivers/gpu/drm/drm_dp_helper.c
> @@ -662,6 +662,42 @@ void drm_dp_downstream_debug(struct seq_file *m,
>  }
>  EXPORT_SYMBOL(drm_dp_downstream_debug);
>  
> +/**
> + * drm_dp_downstream_subconnector_type() - get DP branch device type
> + * @dpcd: DisplayPort configuration data
> + * @port_cap: port capabilities
> + *
> + */
> +enum drm_mode_subconnector
> +drm_dp_downstream_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> +				    const u8 port_cap[4])
> +{
> +	int type = port_cap[0] & DP_DS_PORT_TYPE_MASK;
> +	bool branch_device_present = dpcd[DP_DOWNSTREAMPORT_PRESENT] &
> +				     DP_DWN_STRM_PORT_PRESENT;

drm_dp_is_branch()

> +
> +	if (!branch_device_present)
> +		return DRM_MODE_SUBCONNECTOR_Native;
> +
> +	switch (type) {
> +	case DP_DS_PORT_TYPE_DP:
> +	case DP_DS_PORT_TYPE_DP_DUALMODE:
> +		return DRM_MODE_SUBCONNECTOR_DP;
> +	case DP_DS_PORT_TYPE_VGA:
> +		return DRM_MODE_SUBCONNECTOR_VGA;
> +	case DP_DS_PORT_TYPE_DVI:
> +		return DRM_MODE_SUBCONNECTOR_DVI;
> +	case DP_DS_PORT_TYPE_HDMI:
> +		return DRM_MODE_SUBCONNECTOR_HDMI;
> +	case DP_DS_PORT_TYPE_WIRELESS:
> +		return DRM_MODE_SUBCONNECTOR_Wireless;
> +	case DP_DS_PORT_TYPE_NON_EDID:
> +	default:
> +		return DRM_MODE_SUBCONNECTOR_Unknown;
> +	}

DPCD 1.0 doesn't have the downstream port information at 0x80.
For those you have to rely on DP_DWN_STRM_PORT_TYPE_MASK & co.

> +}
> +EXPORT_SYMBOL(drm_dp_downstream_subconnector_type);
> +
>  /*
>   * I2C-over-AUX implementation
>   */
> diff --git a/include/drm/drm_connector.h b/include/drm/drm_connector.h
> index 4c30d751487a..66f0b2a59c9c 100644
> --- a/include/drm/drm_connector.h
> +++ b/include/drm/drm_connector.h
> @@ -1483,9 +1483,11 @@ const char *drm_get_dvi_i_subconnector_name(int val);
>  const char *drm_get_dvi_i_select_name(int val);
>  const char *drm_get_tv_subconnector_name(int val);
>  const char *drm_get_tv_select_name(int val);
> +const char *drm_get_dp_subconnector_name(int val);
>  const char *drm_get_content_protection_name(int val);
>  
>  int drm_mode_create_dvi_i_properties(struct drm_device *dev);
> +void drm_mode_create_dp_properties(struct drm_device *dev);
>  int drm_mode_create_tv_margin_properties(struct drm_device *dev);
>  int drm_mode_create_tv_properties(struct drm_device *dev,
>  				  unsigned int num_modes,
> diff --git a/include/drm/drm_dp_helper.h b/include/drm/drm_dp_helper.h
> index 397896b5b21a..38792c1afed8 100644
> --- a/include/drm/drm_dp_helper.h
> +++ b/include/drm/drm_dp_helper.h
> @@ -1372,6 +1372,9 @@ int drm_dp_downstream_max_bpc(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
>  int drm_dp_downstream_id(struct drm_dp_aux *aux, char id[6]);
>  void drm_dp_downstream_debug(struct seq_file *m, const u8 dpcd[DP_RECEIVER_CAP_SIZE],
>  			     const u8 port_cap[4], struct drm_dp_aux *aux);
> +enum drm_mode_subconnector
> +drm_dp_downstream_subconnector_type(const u8 dpcd[DP_RECEIVER_CAP_SIZE],
> +				    const u8 port_cap[4]);
>  
>  void drm_dp_aux_init(struct drm_dp_aux *aux);
>  int drm_dp_aux_register(struct drm_dp_aux *aux);
> diff --git a/include/drm/drm_mode_config.h b/include/drm/drm_mode_config.h
> index 759d462d028b..957d99a34843 100644
> --- a/include/drm/drm_mode_config.h
> +++ b/include/drm/drm_mode_config.h
> @@ -680,6 +680,12 @@ struct drm_mode_config {
>  	 */
>  	struct drm_property *dvi_i_select_subconnector_property;
>  
> +	/**
> +	 * @dp_subconnector_property: Optional DP property to differentiate
> +	 * between different DP downstream port types.
> +	 */
> +	struct drm_property *dp_subconnector_property;
> +
>  	/**
>  	 * @tv_subconnector_property: Optional TV property to differentiate
>  	 * between different TV connector types.
> diff --git a/include/uapi/drm/drm_mode.h b/include/uapi/drm/drm_mode.h
> index 5ab331e5dc23..9808464bdb63 100644
> --- a/include/uapi/drm/drm_mode.h
> +++ b/include/uapi/drm/drm_mode.h
> @@ -332,14 +332,20 @@ struct drm_mode_get_encoder {
>  /* This is for connectors with multiple signal types. */
>  /* Try to match DRM_MODE_CONNECTOR_X as closely as possible. */
>  enum drm_mode_subconnector {
> -	DRM_MODE_SUBCONNECTOR_Automatic = 0,
> -	DRM_MODE_SUBCONNECTOR_Unknown = 0,
> -	DRM_MODE_SUBCONNECTOR_DVID = 3,
> -	DRM_MODE_SUBCONNECTOR_DVIA = 4,
> -	DRM_MODE_SUBCONNECTOR_Composite = 5,
> -	DRM_MODE_SUBCONNECTOR_SVIDEO = 6,
> -	DRM_MODE_SUBCONNECTOR_Component = 8,
> -	DRM_MODE_SUBCONNECTOR_SCART = 9,
> +	DRM_MODE_SUBCONNECTOR_Automatic  = 0,  /* DVI-I, TV     */
> +	DRM_MODE_SUBCONNECTOR_Unknown    = 0,  /* DVI-I, TV, DP */
> +	DRM_MODE_SUBCONNECTOR_VGA	 = 1,  /*            DP */
> +	DRM_MODE_SUBCONNECTOR_DVI	 = 2,  /*            DP */
> +	DRM_MODE_SUBCONNECTOR_DVID	 = 3,  /* DVI-I         */
> +	DRM_MODE_SUBCONNECTOR_DVIA	 = 4,  /* DVI-I         */
> +	DRM_MODE_SUBCONNECTOR_Composite  = 5,  /*        TV     */
> +	DRM_MODE_SUBCONNECTOR_SVIDEO	 = 6,  /*        TV     */
> +	DRM_MODE_SUBCONNECTOR_Component  = 8,  /*        TV     */
> +	DRM_MODE_SUBCONNECTOR_SCART	 = 9,  /*        TV     */
> +	DRM_MODE_SUBCONNECTOR_DP	 = 10, /*            DP */
> +	DRM_MODE_SUBCONNECTOR_HDMI       = 11, /*            DP */
> +	DRM_MODE_SUBCONNECTOR_Native     = 15, /*            DP */
> +	DRM_MODE_SUBCONNECTOR_Wireless   = 19, /*            DP */
>  };
>  
>  #define DRM_MODE_CONNECTOR_Unknown	0
> -- 
> 2.22.0
> 
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-- 
Ville Syrjälä
Intel
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