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>
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;