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Message-ID: <Z2N3ggIJVo9gaOfj@google.com>
Date: Thu, 19 Dec 2024 01:31:46 +0000
From: Benson Leung <bleung@...gle.com>
To: Abhishek Pandit-Subedi <abhishekpandit@...omium.org>
Cc: heikki.krogerus@...ux.intel.com, tzungbi@...nel.org,
linux-usb@...r.kernel.org, chrome-platform@...ts.linux.dev,
akuchynski@...gle.com, sboyd@...nel.org, pmalani@...omium.org,
badhri@...gle.com, rdbabiera@...gle.com,
dmitry.baryshkov@...aro.org, jthies@...gle.com,
Benson Leung <bleung@...omium.org>,
Guenter Roeck <groeck@...omium.org>, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v5 7/8] platform/chrome: cros_ec_typec: Thunderbolt
support
On Fri, Dec 13, 2024 at 03:35:48PM -0800, 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@...omium.org>
Reviewed-by: Benson Leung <bleung@...omium.org>
> ---
>
> (no changes since v4)
>
> Changes in v4:
> - Update Makefile + Kconfig to use CONFIG_CROS_EC_TYPEC_ALTMODES
> - Add locking in vdm function
>
> Changes in v3:
> - Fix usage of TBT sid and mode.
> - Removed unused vdm operations during altmode registration
>
> Changes in v2:
> - Refactored thunderbolt support into cros_typec_altmode.c
>
> drivers/platform/chrome/Kconfig | 1 +
> drivers/platform/chrome/cros_ec_typec.c | 23 ++---
> drivers/platform/chrome/cros_typec_altmode.c | 88 ++++++++++++++++++++
> drivers/platform/chrome/cros_typec_altmode.h | 14 ++++
> 4 files changed, 115 insertions(+), 11 deletions(-)
>
> diff --git a/drivers/platform/chrome/Kconfig b/drivers/platform/chrome/Kconfig
> index 23aa594fbb5b..1b2f2bd09662 100644
> --- a/drivers/platform/chrome/Kconfig
> +++ b/drivers/platform/chrome/Kconfig
> @@ -249,6 +249,7 @@ config CROS_EC_TYPEC
> depends on USB_ROLE_SWITCH
> default MFD_CROS_EC_DEV
> select CROS_EC_TYPEC_ALTMODES if TYPEC_DP_ALTMODE
> + select CROS_EC_TYPEC_ALTMODES if TYPEC_TBT_ALTMODE
> help
> If you say Y here, you get support for accessing Type C connector
> information from the Chrome OS EC.
> diff --git a/drivers/platform/chrome/cros_ec_typec.c b/drivers/platform/chrome/cros_ec_typec.c
> index 1bcaa7269395..1ac5798d887f 100644
> --- a/drivers/platform/chrome/cros_ec_typec.c
> +++ b/drivers/platform/chrome/cros_ec_typec.c
> @@ -303,18 +303,19 @@ static int cros_typec_register_port_altmodes(struct cros_typec_data *typec,
>
> /*
> * 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 = TBT_MODE;
> + amode = cros_typec_register_thunderbolt(port, &desc);
> + if (IS_ERR(amode))
> + return PTR_ERR(amode);
> + port->port_altmode[CROS_EC_ALTMODE_TBT] = amode;
> + }
>
> port->state.alt = NULL;
> port->state.mode = TYPEC_STATE_USB;
> diff --git a/drivers/platform/chrome/cros_typec_altmode.c b/drivers/platform/chrome/cros_typec_altmode.c
> index 6e736168ccc3..557340b53af0 100644
> --- a/drivers/platform/chrome/cros_typec_altmode.c
> +++ b/drivers/platform/chrome/cros_typec_altmode.c
> @@ -10,6 +10,7 @@
> #include <linux/mutex.h>
> #include <linux/workqueue.h>
> #include <linux/usb/typec_dp.h>
> +#include <linux/usb/typec_tbt.h>
> #include <linux/usb/pd_vdo.h>
>
> #include "cros_typec_altmode.h"
> @@ -72,6 +73,8 @@ static int cros_typec_altmode_enter(struct typec_altmode *alt, u32 *vdo)
>
> if (adata->sid == USB_TYPEC_DP_SID)
> req.mode_to_enter = CROS_EC_ALTMODE_DP;
> + else if (adata->sid == USB_TYPEC_TBT_SID)
> + req.mode_to_enter = CROS_EC_ALTMODE_TBT;
> else
> return -EOPNOTSUPP;
>
> @@ -196,6 +199,56 @@ static int cros_typec_displayport_vdm(struct typec_altmode *alt, u32 header,
> return 0;
> }
>
> +static int cros_typec_thunderbolt_vdm(struct typec_altmode *alt, u32 header,
> + const u32 *data, int count)
> +{
> + struct cros_typec_altmode_data *adata = typec_altmode_get_drvdata(alt);
> +
> + int cmd_type = PD_VDO_CMDT(header);
> + int cmd = PD_VDO_CMD(header);
> + int svdm_version;
> +
> + svdm_version = typec_altmode_get_svdm_version(alt);
> + if (svdm_version < 0)
> + return svdm_version;
> +
> + mutex_lock(&adata->lock);
> +
> + switch (cmd_type) {
> + case CMDT_INIT:
> + if (PD_VDO_SVDM_VER(header) < svdm_version) {
> + typec_partner_set_svdm_version(adata->port->partner,
> + PD_VDO_SVDM_VER(header));
> + svdm_version = PD_VDO_SVDM_VER(header);
> + }
> +
> + adata->header = VDO(adata->sid, 1, svdm_version, cmd);
> + adata->header |= VDO_OPOS(adata->mode);
> +
> + switch (cmd) {
> + case CMD_ENTER_MODE:
> + /* Don't respond to the enter mode vdm because it
> + * triggers mux configuration. This is handled directly
> + * by the cros_ec_typec driver so the Thunderbolt driver
> + * doesn't need to be involved.
> + */
> + break;
> + default:
> + adata->header |= VDO_CMDT(CMDT_RSP_ACK);
> + schedule_work(&adata->work);
> + break;
> + }
> +
> + break;
> + default:
> + break;
> + }
> +
> + mutex_unlock(&adata->lock);
> + return 0;
> +}
> +
> +
> static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
> const u32 *data, int count)
> {
> @@ -207,6 +260,9 @@ static int cros_typec_altmode_vdm(struct typec_altmode *alt, u32 header,
> if (adata->sid == USB_TYPEC_DP_SID)
> return cros_typec_displayport_vdm(alt, header, data, count);
>
> + if (adata->sid == USB_TYPEC_TBT_SID)
> + return cros_typec_thunderbolt_vdm(alt, header, data, count);
> +
> return -EINVAL;
> }
>
> @@ -283,3 +339,35 @@ cros_typec_register_displayport(struct cros_typec_port *port,
> return alt;
> }
> #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)
> +{
> + struct typec_altmode *alt;
> + struct cros_typec_altmode_data *adata;
> +
> + alt = typec_port_register_altmode(port->port, desc);
> + if (IS_ERR(alt))
> + return alt;
> +
> + adata = devm_kzalloc(&alt->dev, sizeof(*adata), GFP_KERNEL);
> + if (!adata) {
> + typec_unregister_altmode(alt);
> + return ERR_PTR(-ENOMEM);
> + }
> +
> + INIT_WORK(&adata->work, cros_typec_altmode_work);
> + adata->alt = alt;
> + adata->port = port;
> + adata->ap_mode_entry = true;
> + adata->sid = desc->svid;
> + adata->mode = desc->mode;
> +
> + typec_altmode_set_ops(alt, &cros_typec_altmode_ops);
> + typec_altmode_set_drvdata(alt, adata);
> +
> + return alt;
> +}
> +#endif
> diff --git a/drivers/platform/chrome/cros_typec_altmode.h b/drivers/platform/chrome/cros_typec_altmode.h
> index ed00ee7a402b..3f2aa95d065a 100644
> --- a/drivers/platform/chrome/cros_typec_altmode.h
> +++ b/drivers/platform/chrome/cros_typec_altmode.h
> @@ -34,4 +34,18 @@ 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
> +static inline struct typec_altmode *
> +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__ */
> --
> 2.47.1.613.gc27f4b7a9f-goog
>
>
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