Re: [PATCH v2 4/4] drm/i915: Determine DP++ type 1 DVI adaptor presence based on VBT

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On 5/3/2016 12:38 AM, ville.syrjala@xxxxxxxxxxxxxxx wrote:
From: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>

DP dual mode type 1 DVI adaptors aren't required to implement any
registers, so it's a bit hard to detect them. The best way would
be to check the state of the CONFIG1 pin, but we have no way to
do that. So as a last resort, check the VBT to see if the HDMI
port is in fact a dual mode capable DP port.

v2: Deal with VBT code reorganization
     Deal with DRM_DP_DUAL_MODE_UNKNOWN
     Reduce DEVICE_TYPE_DP_DUAL_MODE_BITS a bit
     Accept both DP and HDMI dvo_port in VBT as my BSW
     at least declare its DP port as HDMI :(

Cc: stable@xxxxxxxxxxxxxxx
Cc: Tore Anderson <tore@xxxxxx>
Reported-by: Tore Anderson <tore@xxxxxx>
Fixes: 7a0baa623446 ("Revert "drm/i915: Disable 12bpc hdmi for now"")
Cc: Paulo Zanoni <paulo.r.zanoni@xxxxxxxxx>
Cc: Shashank Sharma <shashank.sharma@xxxxxxxxx>
Cc: Daniel Vetter <daniel.vetter@xxxxxxxx>
Signed-off-by: Ville Syrjälä <ville.syrjala@xxxxxxxxxxxxxxx>
---
  drivers/gpu/drm/i915/i915_drv.h       |  1 +
  drivers/gpu/drm/i915/intel_bios.c     | 36 +++++++++++++++++++++++++++++++++++
  drivers/gpu/drm/i915/intel_hdmi.c     | 30 +++++++++++++++++++++++++----
  drivers/gpu/drm/i915/intel_vbt_defs.h | 13 +++++++++++++
  4 files changed, 76 insertions(+), 4 deletions(-)

diff --git a/drivers/gpu/drm/i915/i915_drv.h b/drivers/gpu/drm/i915/i915_drv.h
index ff6aaf0c4e1e..abe43922a08f 100644
--- a/drivers/gpu/drm/i915/i915_drv.h
+++ b/drivers/gpu/drm/i915/i915_drv.h
@@ -3489,6 +3489,7 @@ bool intel_bios_is_valid_vbt(const void *buf, size_t size);
  bool intel_bios_is_tv_present(struct drm_i915_private *dev_priv);
  bool intel_bios_is_lvds_present(struct drm_i915_private *dev_priv, u8 *i2c_pin);
  bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port);
+bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv, enum port port);
  bool intel_bios_is_dsi_present(struct drm_i915_private *dev_priv, enum port *port);
  bool intel_bios_is_port_hpd_inverted(struct drm_i915_private *dev_priv,
  				     enum port port);
diff --git a/drivers/gpu/drm/i915/intel_bios.c b/drivers/gpu/drm/i915/intel_bios.c
index 81518116e00d..8b68c4882fba 100644
--- a/drivers/gpu/drm/i915/intel_bios.c
+++ b/drivers/gpu/drm/i915/intel_bios.c
@@ -1597,6 +1597,42 @@ bool intel_bios_is_port_edp(struct drm_i915_private *dev_priv, enum port port)
  	return false;
  }

+bool intel_bios_is_port_dp_dual_mode(struct drm_i915_private *dev_priv, enum port port)
+{
+	static const struct {
+		u16 dp, hdmi;
+	} port_mapping[] = {
+		/*
+		 * Buggy VBTs may declare DP ports as having
+		 * HDMI type dvo_port :( So let's check both.
+		 */
+		[PORT_B] = { DVO_PORT_DPB, DVO_PORT_HDMIB, },
+		[PORT_C] = { DVO_PORT_DPC, DVO_PORT_HDMIC, },
+		[PORT_D] = { DVO_PORT_DPD, DVO_PORT_HDMID, },
+		[PORT_E] = { DVO_PORT_DPE, DVO_PORT_HDMIE, },
+	};
+	int i;
+
+	if (port == PORT_A || port >= ARRAY_SIZE(port_mapping))
+		return false;
+
+	if (!dev_priv->vbt.child_dev_num)
+		return false;
+
+	for (i = 0; i < dev_priv->vbt.child_dev_num; i++) {
+		const union child_device_config *p_child =
+			&dev_priv->vbt.child_dev[i];
+
+		if ((p_child->common.dvo_port == port_mapping[port].dp ||
+		     p_child->common.dvo_port == port_mapping[port].hdmi) &&
+		    (p_child->common.device_type & DEVICE_TYPE_DP_DUAL_MODE_BITS) ==
+		    (DEVICE_TYPE_DP_DUAL_MODE & DEVICE_TYPE_DP_DUAL_MODE_BITS))
+			return true;
+	}
+
+	return false;
+}
+
  /**
   * intel_bios_is_dsi_present - is DSI present in VBT
   * @dev_priv:	i915 device instance
diff --git a/drivers/gpu/drm/i915/intel_hdmi.c b/drivers/gpu/drm/i915/intel_hdmi.c
index c4d93e6b4bed..6b52c6accf6a 100644
--- a/drivers/gpu/drm/i915/intel_hdmi.c
+++ b/drivers/gpu/drm/i915/intel_hdmi.c
@@ -1396,16 +1396,38 @@ intel_hdmi_unset_edid(struct drm_connector *connector)
  }

  static void
-intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector)
+intel_hdmi_dp_dual_mode_detect(struct drm_connector *connector, bool has_edid)
  {
  	struct drm_i915_private *dev_priv = to_i915(connector->dev);
  	struct intel_hdmi *hdmi = intel_attached_hdmi(connector);
+	enum port port = hdmi_to_dig_port(hdmi)->port;
  	struct i2c_adapter *adapter =
  		intel_gmbus_get_adapter(dev_priv, hdmi->ddc_bus);
  	enum drm_dp_dual_mode_type type = drm_dp_dual_mode_detect(adapter);

-	if (type == DRM_DP_DUAL_MODE_NONE ||
-	    type == DRM_DP_DUAL_MODE_UNKNOWN)
+	/*
+	 * Type 1 DVI adaptors are not required to implement any
+	 * registers, so we can't always detect their presence.
+	 * Ideally we should be able to check the state of the
+	 * CONFIG1 pin, but no such luck on our hardware.
+	 *
+	 * The only method left to us is to check the VBT to see
+	 * if the port is a dual mode capable DP port. But let's
+	 * only do that when we sucesfully read the EDID, to avoid
+	 * confusing log messages about DP dual mode adaptors when
+	 * there's nothing connected to the port.
+	 */
+	if (type == DRM_DP_DUAL_MODE_UNKNOWN) {
+		if (has_edid &&
+		    intel_bios_is_port_dp_dual_mode(dev_priv, port)) {
+			DRM_DEBUG_KMS("Assuming DP dual mode adaptor presence based on VBT\n");
+			type = DRM_DP_DUAL_MODE_TYPE1_DVI;
+		} else {
+			type = DRM_DP_DUAL_MODE_NONE;
+		}
+	}
+
+	if (type == DRM_DP_DUAL_MODE_NONE)
  		return;

  	hdmi->dp_dual_mode.type = type;
@@ -1432,7 +1454,7 @@ intel_hdmi_set_edid(struct drm_connector *connector, bool force)
  				    intel_gmbus_get_adapter(dev_priv,
  				    intel_hdmi->ddc_bus));

-		intel_hdmi_dp_dual_mode_detect(connector);
+		intel_hdmi_dp_dual_mode_detect(connector, edid != NULL);

  		intel_display_power_put(dev_priv, POWER_DOMAIN_GMBUS);
  	}
diff --git a/drivers/gpu/drm/i915/intel_vbt_defs.h b/drivers/gpu/drm/i915/intel_vbt_defs.h
index a4a42f254c35..b1019e01e51d 100644
--- a/drivers/gpu/drm/i915/intel_vbt_defs.h
+++ b/drivers/gpu/drm/i915/intel_vbt_defs.h
@@ -746,6 +746,7 @@ struct bdb_psr {
  #define	 DEVICE_TYPE_INT_TV	0x1009
  #define	 DEVICE_TYPE_HDMI	0x60D2
  #define	 DEVICE_TYPE_DP		0x68C6
+#define	 DEVICE_TYPE_DP_DUAL_MODE	0x60D6
  #define	 DEVICE_TYPE_eDP	0x78C6

  #define  DEVICE_TYPE_CLASS_EXTENSION	(1 << 15)
@@ -780,6 +781,18 @@ struct bdb_psr {
  	 DEVICE_TYPE_DISPLAYPORT_OUTPUT | \
  	 DEVICE_TYPE_ANALOG_OUTPUT)

+#define DEVICE_TYPE_DP_DUAL_MODE_BITS \
+	(DEVICE_TYPE_INTERNAL_CONNECTOR | \
+	 DEVICE_TYPE_NOT_HDMI_OUTPUT | \
Why do we need this one ? Shouldn't the others cover all the cases ?
Is there a special case in your mind ?

Regards
Shashank
+	 DEVICE_TYPE_MIPI_OUTPUT | \
+	 DEVICE_TYPE_COMPOSITE_OUTPUT | \
+	 DEVICE_TYPE_LVDS_SINGALING | \
+	 DEVICE_TYPE_TMDS_DVI_SIGNALING | \
+	 DEVICE_TYPE_VIDEO_SIGNALING | \
+	 DEVICE_TYPE_DISPLAYPORT_OUTPUT | \
+	 DEVICE_TYPE_DIGITAL_OUTPUT | \
+	 DEVICE_TYPE_ANALOG_OUTPUT)
+
  /* define the DVO port for HDMI output type */
  #define		DVO_B		1
  #define		DVO_C		2

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