From da279eb9a0764f688b627565c1c708c441103707 Mon Sep 17 00:00:00 2001 From: =?utf8?q?Ville=20Syrj=C3=A4l=C3=A4?= Date: Fri, 28 Sep 2018 21:04:01 +0300 Subject: [PATCH] drm/dp: Implement I2C_M_STOP for i2c-over-aux MIME-Version: 1.0 Content-Type: text/plain; charset=utf8 Content-Transfer-Encoding: 8bit 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 Link: https://patchwork.freedesktop.org/patch/msgid/20180928180403.22499-3-ville.syrjala@linux.intel.com Reviewed-by: Dhinakaran Pandiyan --- 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 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; } /* -- 2.30.2