Re: [PATCH v2 6/7] platform/chrome: cros_ec_typec: Thunderbolt support

Dmitry Baryshkov
2024-10-31T18:51:05Z

On Wed, Oct 30, 2024 at 02:28:37PM -0700, Abhishek Pandit-Subedi wrote:
> Add support for entering and exiting Thunderbolt alt-mode using AP
> driven alt-mode.
>
> Signed-off-by: Abhishek Pandit-Subedi <abhishekpandit@chromium.org>
> ---
>
> Changes in v2:
> - Refactored thunderbolt support into cros_typec_altmode.c
>
> drivers/platform/chrome/cros_ec_typec.c | 29 ++++---
> drivers/platform/chrome/cros_typec_altmode.c | 85 ++++++++++++++++++++
> drivers/platform/chrome/cros_typec_altmode.h | 14 ++++
> 3 files changed, 116 insertions(+), 12 deletions(-)
>
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 7997e7136c4c..3e043b1c1cc8 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -304,21 +304,26 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
> typec_altmode_set_drvdata(amode, port);
> amode->ops = &port_amode_ops;
> #endif
> -
> /*
> * Register TBT compatibility alt mode. The EC will not enter the mode
> - * if it doesn't support it, so it's safe to register it unconditionally
> - * here for now.
> + * if it doesn't support it and it will not enter automatically by
> + * design so we can use the |ap_driven_altmode| feature to check if we
> + * should register it.
> */
> - memset(&desc, 0, sizeof(desc));
> - desc.svid = USB_TYPEC_TBT_SID;
> - desc.mode = TYPEC_ANY_MODE;
> - amode = typec_port_register_altmode(port->port, &desc);
> - if (IS_ERR(amode))
> - return PTR_ERR(amode);
> - port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
> - typec_altmode_set_drvdata(amode, port);
> - amode->ops = &port_amode_ops;
> + if (typec->ap_driven_altmode) {
> + memset(&desc, 0, sizeof(desc));
> + desc.svid = USB_TYPEC_TBT_SID;
> + desc.mode = TYPEC_ANY_MODE;
> + amode = cros_typec_register_thunderbolt(port, &desc);
> + if (IS_ERR(amode))
> + return PTR_ERR(amode);
> + port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
> +
> +#if !IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
> + typec_altmode_set_drvdata(amode, port);
> + amode->ops = &port_amode_ops;
> +#endif

Why? Usually having the code block under an #if is a frowned upon
practice.

> + }
>
> port->state.alt = NULL;
> port->state.mode = TYPEC_STATE_USB;

[...]

> diff --git a/drivers/platform/chrome/cros_typec_altmode.h b/drivers/platform/chrome/cros_typec_altmode.h
> index c6f8fb02c99c..c71568314e3f 100644
> --- a/drivers/platform/chrome/cros_typec_altmode.h
> +++ b/drivers/platform/chrome/cros_typec_altmode.h
> @@ -31,4 +31,18 @@ static inline int cros_typec_displayport_status_update(struct typec_altmode *alt
> return 0;
> }
> #endif
> +
> +#if IS_ENABLED(CONFIG_TYPEC_TBT_ALTMODE)
> +struct typec_altmode *
> +cros_typec_register_thunderbolt(struct cros_typec_port *port,
> + struct typec_altmode_desc *desc);
> +#else
> +struct typec_altmode *

static inline struct ...
LGTM otherwise

> +cros_typec_register_thunderbolt(struct cros_typec_port *port,
> + struct typec_altmode_desc *desc)
> +{
> + return typec_port_register_altmode(port->port, desc);
> +}
> +#endif
> +
> #endif /* __CROS_TYPEC_ALTMODE_H__ */
> --
> 2.47.0.163.g1226f6d8fa-goog
>

--
With best wishes
Dmitry