drm/nouveau: check for known dcb connector types

Signed-off-by: Ben Skeggs <bskeggs@redhat.com>

1 files changed, 61 insertions, 0 deletions

diff --git a/drivers/gpu/drm/nouveau/nouveau_bios.c b/drivers/gpu/drm/nouveau/nouveau_bios.c
index ea690a73532..8dd97b28df3 100644
--- a/drivers/gpu/drm/nouveau/nouveau_bios.c
+++ b/drivers/gpu/drm/nouveau/nouveau_bios.c
@@ -5173,6 +5173,43 @@ nouveau_bios_connector_entry(struct drm_device *dev, int index)
         return cte;
 }
 
+static enum dcb_connector_type
+divine_connector_type(struct nvbios *bios, int index)
+{
+        struct dcb_table *dcb = &bios->dcb;
+        unsigned encoders = 0, type = DCB_CONNECTOR_NONE;
+        int i;
+
+        for (i = 0; i < dcb->entries; i++) {
+                if (dcb->entry[i].connector == index)
+                        encoders |= (1 << dcb->entry[i].type);
+        }
+
+        if (encoders & (1 << OUTPUT_DP)) {
+                if (encoders & (1 << OUTPUT_TMDS))
+                        type = DCB_CONNECTOR_DP;
+                else
+                        type = DCB_CONNECTOR_eDP;
+        } else
+        if (encoders & (1 << OUTPUT_TMDS)) {
+                if (encoders & (1 << OUTPUT_ANALOG))
+                        type = DCB_CONNECTOR_DVI_I;
+                else
+                        type = DCB_CONNECTOR_DVI_D;
+        } else
+        if (encoders & (1 << OUTPUT_ANALOG)) {
+                type = DCB_CONNECTOR_VGA;
+        } else
+        if (encoders & (1 << OUTPUT_LVDS)) {
+                type = DCB_CONNECTOR_LVDS;
+        } else
+        if (encoders & (1 << OUTPUT_TV)) {
+                type = DCB_CONNECTOR_TV_0;
+        }
+
+        return type;
+}
+
 static void
 parse_dcb_connector_table(struct nvbios *bios)
 {
@@ -5205,6 +5242,7 @@ parse_dcb_connector_table(struct nvbios *bios)
                         cte->entry = ROM16(entry[0]);
                 else
                         cte->entry = ROM32(entry[0]);
+
                 cte->type  = (cte->entry & 0x000000ff) >> 0;
                 cte->index = (cte->entry & 0x00000f00) >> 8;
                 switch (cte->entry & 0x00033000) {
@@ -5230,6 +5268,29 @@ parse_dcb_connector_table(struct nvbios *bios)
 
                 NV_INFO(dev, "  %d: 0x%08x: type 0x%02x idx %d tag 0x%02x\n",
                         i, cte->entry, cte->type, cte->index, cte->gpio_tag);
+
+                /* check for known types, fallback to guessing the type
+                 * from attached encoders if we hit an unknown.
+                 */
+                switch (cte->type) {
+                case DCB_CONNECTOR_VGA:
+                case DCB_CONNECTOR_TV_0:
+                case DCB_CONNECTOR_TV_1:
+                case DCB_CONNECTOR_TV_3:
+                case DCB_CONNECTOR_DVI_I:
+                case DCB_CONNECTOR_DVI_D:
+                case DCB_CONNECTOR_LVDS:
+                case DCB_CONNECTOR_DP:
+                case DCB_CONNECTOR_eDP:
+                case DCB_CONNECTOR_HDMI_0:
+                case DCB_CONNECTOR_HDMI_1:
+                        break;
+                default:
+                        cte->type = divine_connector_type(bios, cte->index);
+                        NV_WARN(dev, "unknown type, using 0x%02x", cte->type);
+                        break;
+                }
+
         }
 }