diff options
| author | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2018-09-28 21:04:01 +0300 |
|---|---|---|
| committer | Ville Syrjälä <ville.syrjala@linux.intel.com> | 2019-01-22 21:34:13 +0200 |
| commit | da279eb9a0764f688b627565c1c708c441103707 (patch) | |
| tree | 123dd75fde100087249ba69fe40074899c38f93d /drivers/gpu/drm/drm_dp_helper.c | |
| parent | b64674465289866df095899a353d1e6bf21cdeef (diff) | |
drm/dp: Implement I2C_M_STOP for i2c-over-aux
Consult the I2C_M_STOP flag to determine whether to set the MOT bit or
not. Makes it possible to send multiple messages in one go with
stop+start generated between the messages (as opposed nothing or
repstart depending on whether thr address/rw changed).
Not sure anyone has actual use for this but figured I'd handle it
since I started to look at that flag for MST remote i2c xfers.
Signed-off-by: Ville Syrjälä <ville.syrjala@linux.intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20180928180403.22499-3-ville.syrjala@linux.intel.com
Reviewed-by: Dhinakaran Pandiyan <dhinakaran.pandiyan@intel.com>
Diffstat (limited to 'drivers/gpu/drm/drm_dp_helper.c')
| -rw-r--r-- | drivers/gpu/drm/drm_dp_helper.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c index fc2a98a82250..d4ecedccbb31 100644 --- a/drivers/gpu/drm/drm_dp_helper.c +++ b/drivers/gpu/drm/drm_dp_helper.c @@ -887,7 +887,8 @@ static void drm_dp_i2c_msg_set_request(struct drm_dp_aux_msg *msg, { msg->request = (i2c_msg->flags & I2C_M_RD) ? DP_AUX_I2C_READ : DP_AUX_I2C_WRITE; - msg->request |= DP_AUX_I2C_MOT; + if (!(i2c_msg->flags & I2C_M_STOP)) + msg->request |= DP_AUX_I2C_MOT; } /* |