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

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Date:   Fri, 20 Jan 2023 13:01:26 -0800
From:   Guenter Roeck <linux@...ck-us.net>
To:     Prashant Malani <pmalani@...omium.org>,
        linux-kernel@...r.kernel.org, linux-usb@...r.kernel.org
Cc:     bleung@...omium.org, heikki.krogerus@...ux.intel.com,
        gregkh@...uxfoundation.org
Subject: Re: [PATCH v2 1/2] usb: typec: altmodes/displayport: Update active
 state

On 1/20/23 12:58, Prashant Malani wrote:
> 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>

Reviewed-by: Guenter Roeck <linux@...ck-us.net>

> ---
> 
> 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;