drm/nouveau/bios: fix i2c table parsing for dcb 4.1

Code before looked only at bit 31 to decide if a port is unused.
However dcb 4.1 spec says 0x1F in bits 31-27 and 26-22 means unused.

This fixed hdmi monitor detection on GM206.

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

diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
index d1a89b2..c4e1f08 100644 (file)
--- a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
+++ b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
@@ -74,7 +74,11 @@ dcb_i2c_parse(struct nvkm_bios *bios, u8 idx, struct dcb_i2c_entry *info)
        u16 ent = dcb_i2c_entry(bios, idx, &ver, &len);
        if (ent) {
                if (ver >= 0x41) {
-                       if (!(nv_ro32(bios, ent) & 0x80000000))
+                       u32 ent_value = nv_ro32(bios, ent);
+                       u8 i2c_port = (ent_value >> 27) & 0x1f;
+                       u8 dpaux_port = (ent_value >> 22) & 0x1f;
+                       /* value 0x1f means unused according to DCB 4.x spec */
+                       if (i2c_port == 0x1f && dpaux_port == 0x1f)
                                info->type = DCB_I2C_UNUSED;
                        else
                                info->type = DCB_I2C_PMGR;