linux-kernel - [PATCH v2 1/2] usb: typec: altmodes/displayport: Update active state

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Date:   Fri, 20 Jan 2023 20:58:26 +0000
From:   Prashant Malani <pmalani@...omium.org>
To:     linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org, Prashant Malani <pmalani@...omium.org>,
        Guenter Roeck <linux@...ck-us.net>
Subject: [PATCH v2 1/2] usb: typec: altmodes/displayport: Update active state

Update the altmode "active" state when we receive Acks for Enter and
Exit Mode commands. Having the right state is necessary to change Pin
Assignments using the 'pin_assignment" sysfs file.

Cc: Heikki Krogerus <heikki.krogerus@...ux.intel.com>
Reviewed-by: Benson Leung <bleung@...omium.org>
Signed-off-by: Prashant Malani <pmalani@...omium.org>
---

Changes since v1:
- Dropped the Fixes and Cc: stable tags; given the discussion in [1]
  I no longer think this constitutes a fix.
- Added Reviewed-by tag from Benson.

[1] https://lore.kernel.org/linux-usb/20230118031514.1278139-1-pmalani@chromium.org/

 drivers/usb/typec/altmodes/displayport.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/drivers/usb/typec/altmodes/displayport.c b/drivers/usb/typec/altmodes/displayport.c
index 06fb4732f8cd..bc1c556944d6 100644
--- a/drivers/usb/typec/altmodes/displayport.c
+++ b/drivers/usb/typec/altmodes/displayport.c
@@ -277,9 +277,11 @@ static int dp_altmode_vdm(struct typec_altmode *alt,
 	case CMDT_RSP_ACK:
 		switch (cmd) {
 		case CMD_ENTER_MODE:
+			typec_altmode_update_active(alt, true);
 			dp->state = DP_STATE_UPDATE;
 			break;
 		case CMD_EXIT_MODE:
+			typec_altmode_update_active(alt, false);
 			dp->data.status = 0;
 			dp->data.conf = 0;
 			break;
-- 
2.39.0.246.g2a6d74b583-goog