disp: msm: dp: reset combo phy if peer_usb_comm is disabled

Some Type-C multi-port adapters which do not support usb connection
are advertising the multi-functionality in DP alt mode. If
multi-functionality is preferred, the DP driver assumes the adapter
supports usb connection and USB phy driver will program the PHY mode
to DP+USB.

In source mode, usb PD driver checks for the peer_usb_connection
of the adapter. If it does not support usb then it will stop usb stack
and update the PHY MODE to USB only mode from phy_suspend path.
The result is, usb may program the combo PHY to usb only mode when DP
is already connected. This is causing AUX read/write timeouts when DP
is trying to access the phy registers.

To fix this issue, a flag in SVID connect handler in usbpd driver to
notify peer_usb_comm support to the DP driver. DP driver will read this
flag and program the phy mode.

Change-Id: I0164b239bf2832d480795d90f5e9fc221bcc12ba
Signed-off-by: Sankeerth Billakanti <sbillaka@codeaurora.org>

msm/dp/dp_display.c

@@ -781,7 +781,8 @@ static void dp_display_host_init(struct dp_display_private *dp)
 	if (dp->hpd->orientation == ORIENTATION_CC2)
 		flip = true;
 
-	reset = dp->debug->sim_mode ? false : !dp->hpd->multi_func;
+	reset = dp->debug->sim_mode ? false :
+		(!dp->hpd->multi_func || !dp->hpd->peer_usb_comm);
 
 	dp->power->init(dp->power, flip);
 	dp->hpd->host_init(dp->hpd, &dp->catalog->hpd);