diff options
| author | Francisco Jerez <currojerez@riseup.net> | 2010-07-23 23:17:57 +0200 |
|---|---|---|
| committer | Ben Skeggs <bskeggs@redhat.com> | 2010-07-26 11:43:31 +1000 |
| commit | f1feda70b5dfdbe6a1069efffec099b430467331 (patch) | |
| tree | 95d7dd0abe2f808ca8812bd2f19967564c2b39d7 /drivers/gpu/drm/nouveau | |
| parent | e04d8e829d7807e132d8c82c3554b164a803c617 (diff) | |
drm/nouveau: Put back the old 2-messages I2C slave test.
I was hoping we could detect I2C devices at a given address without
actually writing data into them, but apparently some DDC slaves get
confused with 0-bytes transactions. Put the good old test back.
Reported-by: Ben Skeggs <bskeggs@redhat.com>
Signed-off-by: Francisco Jerez <currojerez@riseup.net>
Signed-off-by: Ben Skeggs <bskeggs@redhat.com>
Diffstat (limited to 'drivers/gpu/drm/nouveau')
| -rw-r--r-- | drivers/gpu/drm/nouveau/nouveau_i2c.c | 19 |
1 files changed, 15 insertions, 4 deletions
diff --git a/drivers/gpu/drm/nouveau/nouveau_i2c.c b/drivers/gpu/drm/nouveau/nouveau_i2c.c index 97ba89ef42a0..5588e66dd9fc 100644 --- a/drivers/gpu/drm/nouveau/nouveau_i2c.c +++ b/drivers/gpu/drm/nouveau/nouveau_i2c.c @@ -281,12 +281,23 @@ nouveau_i2c_find(struct drm_device *dev, int index) bool nouveau_probe_i2c_addr(struct nouveau_i2c_chan *i2c, int addr) { - struct i2c_msg msg = { - .addr = addr, - .len = 0, + uint8_t buf[] = { 0 }; + struct i2c_msg msgs[] = { + { + .addr = addr, + .flags = 0, + .len = 1, + .buf = buf, + }, + { + .addr = addr, + .flags = I2C_M_RD, + .len = 1, + .buf = buf, + } }; - return i2c_transfer(&i2c->adapter, &msg, 1) == 1; + return i2c_transfer(&i2c->adapter, msgs, 2) == 2; } int |