Patch "usb: typec: altmodes/displayport: Fix configure initial pin assignment" has been added to the 6.2-stable tree

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This is a note to let you know that I've just added the patch titled

    usb: typec: altmodes/displayport: Fix configure initial pin assignment

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     usb-typec-altmodes-displayport-fix-configure-initial-pin-assignment.patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.


>From eddebe39602efe631b83ff8d03f26eba12cfd760 Mon Sep 17 00:00:00 2001
From: RD Babiera <rdbabiera@xxxxxxxxxx>
Date: Wed, 29 Mar 2023 21:51:59 +0000
Subject: usb: typec: altmodes/displayport: Fix configure initial pin assignment

From: RD Babiera <rdbabiera@xxxxxxxxxx>

commit eddebe39602efe631b83ff8d03f26eba12cfd760 upstream.

While determining the initial pin assignment to be sent in the configure
message, using the DP_PIN_ASSIGN_DP_ONLY_MASK mask causes the DFP_U to
send both Pin Assignment C and E when both are supported by the DFP_U and
UFP_U. The spec (Table 5-7 DFP_U Pin Assignment Selection Mandates,
VESA DisplayPort Alt Mode Standard v2.0) indicates that the DFP_U never
selects Pin Assignment E when Pin Assignment C is offered.

Update the DP_PIN_ASSIGN_DP_ONLY_MASK conditional to intially select only
Pin Assignment C if it is available.

Fixes: 0e3bb7d6894d ("usb: typec: Add driver for DisplayPort alternate mode")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: RD Babiera <rdbabiera@xxxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230329215159.2046932-1-rdbabiera@xxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
 drivers/usb/typec/altmodes/displayport.c |    6 +++++-
 1 file changed, 5 insertions(+), 1 deletion(-)

--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -112,8 +112,12 @@ static int dp_altmode_configure(struct d
 		if (dp->data.status & DP_STATUS_PREFER_MULTI_FUNC &&
 		    pin_assign & DP_PIN_ASSIGN_MULTI_FUNC_MASK)
 			pin_assign &= DP_PIN_ASSIGN_MULTI_FUNC_MASK;
-		else if (pin_assign & DP_PIN_ASSIGN_DP_ONLY_MASK)
+		else if (pin_assign & DP_PIN_ASSIGN_DP_ONLY_MASK) {
 			pin_assign &= DP_PIN_ASSIGN_DP_ONLY_MASK;
+			/* Default to pin assign C if available */
+			if (pin_assign & BIT(DP_PIN_ASSIGN_C))
+				pin_assign = BIT(DP_PIN_ASSIGN_C);
+		}
 
 		if (!pin_assign)
 			return -EINVAL;


Patches currently in stable-queue which might be from rdbabiera@xxxxxxxxxx are

queue-6.2/usb-typec-altmodes-displayport-fix-configure-initial-pin-assignment.patch



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