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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>
This commit is contained in:
Stefan Huehner 2015-02-22 15:46:36 +01:00 committed by Ben Skeggs
parent 7e547adcea
commit 5a6f690ca5
1 changed files with 5 additions and 1 deletions
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6
drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c
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@ -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;