diff options
| author | Stefan Huehner <stefan@huehner.org> | 2015-02-22 15:46:36 +0100 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2015-03-17 09:44:23 +1000 |
| commit | 5a6f690ca565f536ab0fc05e267b08d5a7c36b46 (patch) | |
| tree | 5e0cdb9e9d1812fe39ce6792804371ccd5e88857 /drivers/gpu | |
| parent | 7e547adcea7b9d927009717e1f3303879d5f2687 (diff) | |
| download | linux-5a6f690ca565f536ab0fc05e267b08d5a7c36b46.tar.bz2 | |
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>
Diffstat (limited to 'drivers/gpu')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c | 6 |
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c b/drivers/gpu/drm/nouveau/nvkm/subdev/bios/i2c.c index d1a89b2bd5c1..c4e1f085ee10 100644 --- 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; |