[Intel-gfx] [PATCH 3/5] drm/dp: Implement I2C_M_STOP for i2c-over-aux

[Ville Syrjala]

From: Ville Syrjälä <ville.syrjala at linux.intel.com>

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 at linux.intel.com>
---
 drivers/gpu/drm/drm_dp_helper.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_dp_helper.c b/drivers/gpu/drm/drm_dp_helper.c
index 37c01b6076ec..e85cea299d2a 100644
--- a/drivers/gpu/drm/drm_dp_helper.c
+++ b/drivers/gpu/drm/drm_dp_helper.c
@@ -884,7 +884,8 @@ 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;
 }
 
 /*
-- 
2.16.4