Mon, Jan 19, 2026 at 01:18:24PM +0000, Andrei Kuchynski kirjoitti:
> The mode selection sequence is initiated by the driver after all partner
> alternate modes have been successfully registered.
> When a partner is disconnected, the driver also stops the mode selection
> process and releases resources via `typec_mode_selection_delete`.
>
> Signed-off-by: Andrei Kuchynski <akuchynski@chromium.org>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
> Changes in V5:
> - Use the no_mode_control field instead of
> con->ucsi->cap.features & UCSI_CAP_ALT_MODE_OVERRIDE
>
> drivers/usb/typec/ucsi/cros_ec_ucsi.c | 22 ++++++++++++++++++++++
> 1 file changed, 22 insertions(+)
>
> diff --git a/drivers/usb/typec/ucsi/cros_ec_ucsi.c b/drivers/usb/typec/ucsi/cros_ec_ucsi.c
> index eed2a7d0ebc63..6bca2dce211cd 100644
> --- a/drivers/usb/typec/ucsi/cros_ec_ucsi.c
> +++ b/drivers/usb/typec/ucsi/cros_ec_ucsi.c
> @@ -16,6 +16,7 @@
> #include <linux/platform_device.h>
> #include <linux/slab.h>
> #include <linux/wait.h>
> +#include <linux/usb/typec_altmode.h>
>
> #include "ucsi.h"
>
> @@ -33,6 +34,11 @@
> /* Number of times to attempt recovery from a write timeout before giving up. */
> #define WRITE_TMO_CTR_MAX 5
>
> +/* Delay between mode entry/exit attempts, ms */
> +static const unsigned int mode_selection_delay = 1000;
> +/* Timeout for a mode entry attempt, ms */
> +static const unsigned int mode_selection_timeout = 4000;
> +
> struct cros_ucsi_data {
> struct device *dev;
> struct ucsi *ucsi;
> @@ -134,6 +140,20 @@ static int cros_ucsi_sync_control(struct ucsi *ucsi, u64 cmd, u32 *cci,
> return ret;
> }
>
> +static void cros_ucsi_add_partner_altmodes(struct ucsi_connector *con)
> +{
> + if (!con->typec_cap.no_mode_control)
> + typec_mode_selection_start(con->partner,
> + mode_selection_delay,
> + mode_selection_timeout);
> +}
> +
> +static void cros_ucsi_remove_partner_altmodes(struct ucsi_connector *con)
> +{
> + if (!con->typec_cap.no_mode_control)
> + typec_mode_selection_delete(con->partner);
> +}
> +
> static const struct ucsi_operations cros_ucsi_ops = {
> .read_version = cros_ucsi_read_version,
> .read_cci = cros_ucsi_read_cci,
> @@ -141,6 +161,8 @@ static const struct ucsi_operations cros_ucsi_ops = {
> .read_message_in = cros_ucsi_read_message_in,
> .async_control = cros_ucsi_async_control,
> .sync_control = cros_ucsi_sync_control,
> + .add_partner_altmodes = cros_ucsi_add_partner_altmodes,
> + .remove_partner_altmodes = cros_ucsi_remove_partner_altmodes,
> };
>
> static void cros_ucsi_work(struct work_struct *work)
> --
> 2.52.0.457.g6b5491de43-goog
--
heikki