[PATCH 5.4 259/340] drm/nouveau/kms: handle mDP connectors

[Greg Kroah-Hartman]

From: Karol Herbst <kherbst at redhat.com>

commit d1f5a3fc85566e9ddce9361ef180f070367e6eab upstream.

In some cases we have the handle those explicitly as the fallback
connector type detection fails and marks those as eDP connectors.

Attempting to use such a connector with mutter leads to a crash of mutter
as it ends up with two eDP displays.

Information is taken from the official DCB documentation.

Cc: stable at vger.kernel.org
Cc: dri-devel at lists.freedesktop.org
Cc: Ben Skeggs <bskeggs at redhat.com>
Reported-by: Mark Pearson <markpearson at lenovo.com>
Tested-by: Mark Pearson <markpearson at lenovo.com>
Signed-off-by: Karol Herbst <kherbst at redhat.com>
Signed-off-by: Ben Skeggs <bskeggs at redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh at linuxfoundation.org>
---
 drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h |    1 +
 drivers/gpu/drm/nouveau/nouveau_connector.c             |    1 +
 2 files changed, 2 insertions(+)

--- a/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
+++ b/drivers/gpu/drm/nouveau/include/nvkm/subdev/bios/conn.h
@@ -14,6 +14,7 @@ enum dcb_connector_type {
 	DCB_CONNECTOR_LVDS_SPWG = 0x41,
 	DCB_CONNECTOR_DP = 0x46,
 	DCB_CONNECTOR_eDP = 0x47,
+	DCB_CONNECTOR_mDP = 0x48,
 	DCB_CONNECTOR_HDMI_0 = 0x60,
 	DCB_CONNECTOR_HDMI_1 = 0x61,
 	DCB_CONNECTOR_HDMI_C = 0x63,
--- a/drivers/gpu/drm/nouveau/nouveau_connector.c
+++ b/drivers/gpu/drm/nouveau/nouveau_connector.c
@@ -1240,6 +1240,7 @@ drm_conntype_from_dcb(enum dcb_connector
 	case DCB_CONNECTOR_DMS59_DP0:
 	case DCB_CONNECTOR_DMS59_DP1:
 	case DCB_CONNECTOR_DP       :
+	case DCB_CONNECTOR_mDP      :
 	case DCB_CONNECTOR_USB_C    : return DRM_MODE_CONNECTOR_DisplayPort;
 	case DCB_CONNECTOR_eDP      : return DRM_MODE_CONNECTOR_eDP;
 	case DCB_CONNECTOR_HDMI_0   :