LinuxLists.cc - [PATCH v2 0/1] usb: typec: ucsi: Check capabilities before discovery

2024-03-15 17:19:08

Subject: [PATCH v2 0/1] usb: typec: ucsi: Check capabilities before discovery

Hi Heikki,

This patch updates the UCSI driver to better check the appropriate
capability bit before sending a UCSI command to discovery cable and
identity information.

These have been tested on a the usb-testing branch merged with a
chromeOS 6.8-rc2 kernel. Let me know if you have any questions.

Thanks,
Jameson

Jameson Thies (1):
usb: typec: ucsi: Check capabilities before cable and identity
discovery

drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
drivers/usb/typec/ucsi/ucsi.h | 5 +++--
2 files changed, 24 insertions(+), 15 deletions(-)

base-commit: d99e42ce6b8341d3f09e22c6706461ec900fe172
--
2.44.0.291.gc1ea87d7ee-goog

2024-03-15 17:19:26

by Jameson Thies

[permalink] [raw]

Subject: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
sending GET_CABLE_PROPERTY to discover the cable and check
UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
move 8 bits from reserved_1 to features in the ucsi_capability struct. This
makes the field 16 bits, still 8 short of the 24 bits allocated for it in
UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
bmOptionalFeatures.

Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
Link: https://lore.kernel.org/linux-usb/[email protected]
Suggested-by: Neil Armstrong <[email protected]>
Signed-off-by: Jameson Thies <[email protected]>
---
Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
GET_ALTERNATE_MODES still requested identity and cable information.

drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
drivers/usb/typec/ucsi/ucsi.h | 5 +++--
2 files changed, 24 insertions(+), 15 deletions(-)

diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
index cf52cb34d2859..958dc82989b60 100644
--- a/drivers/usb/typec/ucsi/ucsi.c
+++ b/drivers/usb/typec/ucsi/ucsi.c
@@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
if (ret < 0)
return ret;

- ret = ucsi_get_cable_identity(con);
- if (ret < 0)
- return ret;
+ if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
+ ret = ucsi_get_cable_identity(con);
+ if (ret < 0)
+ return ret;
+ }

- ret = ucsi_register_plug(con);
- if (ret < 0)
- return ret;
+ if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
+ ret = ucsi_register_plug(con);
+ if (ret < 0)
+ return ret;

- ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
- if (ret < 0)
- return ret;
+ ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
+ if (ret < 0)
+ return ret;
+ }

return 0;
}
@@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
ucsi_register_partner(con);
ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
- ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
- ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
+ if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
+ ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
+ if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
+ ucsi_partner_task(con, ucsi_check_cable, 1, HZ);

if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
UCSI_CONSTAT_PWR_OPMODE_PD)
@@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
ucsi_register_partner(con);
ucsi_pwr_opmode_change(con);
ucsi_port_psy_changed(con);
- ucsi_get_partner_identity(con);
- ucsi_check_cable(con);
+ if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
+ ucsi_get_partner_identity(con);
+ if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
+ ucsi_check_cable(con);
}

/* Only notify USB controller if partner supports USB data */
diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
index 32daf5f586505..0e7c92eb1b227 100644
--- a/drivers/usb/typec/ucsi/ucsi.h
+++ b/drivers/usb/typec/ucsi/ucsi.h
@@ -206,7 +206,7 @@ struct ucsi_capability {
#define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
#define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
u8 num_connectors;
- u8 features;
+ u16 features;
#define UCSI_CAP_SET_UOM BIT(0)
#define UCSI_CAP_SET_PDM BIT(1)
#define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
@@ -215,7 +215,8 @@ struct ucsi_capability {
#define UCSI_CAP_CABLE_DETAILS BIT(5)
#define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
#define UCSI_CAP_PD_RESET BIT(7)
- u16 reserved_1;
+#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
+ u8 reserved_1;
u8 num_alt_modes;
u8 reserved_2;
u16 bc_version;
--
2.44.0.291.gc1ea87d7ee-goog

2024-03-15 17:23:10

by Neil Armstrong

[permalink] [raw]

Subject: Re: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

Hi,

On 15/03/2024 18:18, Jameson Thies wrote:
> Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
> discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
> sending GET_CABLE_PROPERTY to discover the cable and check
> UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
> move 8 bits from reserved_1 to features in the ucsi_capability struct. This
> makes the field 16 bits, still 8 short of the 24 bits allocated for it in
> UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
> bmOptionalFeatures.
>
> Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
> Link: https://lore.kernel.org/linux-usb/[email protected]
> Suggested-by: Neil Armstrong <[email protected]>
> Signed-off-by: Jameson Thies <[email protected]>
> ---
> Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
> GET_ALTERNATE_MODES still requested identity and cable information.
>
> drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
> drivers/usb/typec/ucsi/ucsi.h | 5 +++--
> 2 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cf52cb34d2859..958dc82989b60 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
> if (ret < 0)
> return ret;
>
> - ret = ucsi_get_cable_identity(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
> + ret = ucsi_get_cable_identity(con);
> + if (ret < 0)
> + return ret;
> + }
>
> - ret = ucsi_register_plug(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
> + ret = ucsi_register_plug(con);
> + if (ret < 0)
> + return ret;
>
> - ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> - if (ret < 0)
> - return ret;
> + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> + if (ret < 0)
> + return ret;
> + }
>
> return 0;
> }
> @@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> - ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> - ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> - ucsi_get_partner_identity(con);
> - ucsi_check_cable(con);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_get_partner_identity(con);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 32daf5f586505..0e7c92eb1b227 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -206,7 +206,7 @@ struct ucsi_capability {
> #define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
> #define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
> u8 num_connectors;
> - u8 features;
> + u16 features;
> #define UCSI_CAP_SET_UOM BIT(0)
> #define UCSI_CAP_SET_PDM BIT(1)
> #define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
> @@ -215,7 +215,8 @@ struct ucsi_capability {
> #define UCSI_CAP_CABLE_DETAILS BIT(5)
> #define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
> #define UCSI_CAP_PD_RESET BIT(7)
> - u16 reserved_1;
> +#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
> + u8 reserved_1;
> u8 num_alt_modes;
> u8 reserved_2;
> u16 bc_version;

It looks fine:
Reviewed-by: Neil Armstrong <[email protected]>

I'll run a test on the affected platforms in the next days and
report if it fixes the regression.

Thanks,
Neil

2024-03-15 18:43:40

by Benson Leung

[permalink] [raw]

Subject: Re: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

Hi Jameson,

On Fri, Mar 15, 2024 at 05:18:35PM +0000, Jameson Thies wrote:
> Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
> discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
> sending GET_CABLE_PROPERTY to discover the cable and check
> UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
> move 8 bits from reserved_1 to features in the ucsi_capability struct. This
> makes the field 16 bits, still 8 short of the 24 bits allocated for it in
> UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
> bmOptionalFeatures.
>
> Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
> Link: https://lore.kernel.org/linux-usb/[email protected]
> Suggested-by: Neil Armstrong <[email protected]>
> Signed-off-by: Jameson Thies <[email protected]>

Reviewed-by: Benson Leung <[email protected]>

Thanks!

> ---
> Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
> GET_ALTERNATE_MODES still requested identity and cable information.
>
> drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
> drivers/usb/typec/ucsi/ucsi.h | 5 +++--
> 2 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cf52cb34d2859..958dc82989b60 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
> if (ret < 0)
> return ret;
>
> - ret = ucsi_get_cable_identity(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
> + ret = ucsi_get_cable_identity(con);
> + if (ret < 0)
> + return ret;
> + }
>
> - ret = ucsi_register_plug(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
> + ret = ucsi_register_plug(con);
> + if (ret < 0)
> + return ret;
>
> - ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> - if (ret < 0)
> - return ret;
> + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> + if (ret < 0)
> + return ret;
> + }
>
> return 0;
> }
> @@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> - ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> - ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> - ucsi_get_partner_identity(con);
> - ucsi_check_cable(con);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_get_partner_identity(con);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 32daf5f586505..0e7c92eb1b227 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -206,7 +206,7 @@ struct ucsi_capability {
> #define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
> #define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
> u8 num_connectors;
> - u8 features;
> + u16 features;
> #define UCSI_CAP_SET_UOM BIT(0)
> #define UCSI_CAP_SET_PDM BIT(1)
> #define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
> @@ -215,7 +215,8 @@ struct ucsi_capability {
> #define UCSI_CAP_CABLE_DETAILS BIT(5)
> #define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
> #define UCSI_CAP_PD_RESET BIT(7)
> - u16 reserved_1;
> +#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
> + u8 reserved_1;
> u8 num_alt_modes;
> u8 reserved_2;
> u16 bc_version;
> --
> 2.44.0.291.gc1ea87d7ee-goog
>

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2024-03-18 09:13:30

by Neil Armstrong

[permalink] [raw]

Subject: Re: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

On 15/03/2024 18:18, Jameson Thies wrote:
> Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
> discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
> sending GET_CABLE_PROPERTY to discover the cable and check
> UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
> move 8 bits from reserved_1 to features in the ucsi_capability struct. This
> makes the field 16 bits, still 8 short of the 24 bits allocated for it in
> UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
> bmOptionalFeatures.
>
> Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
> Link: https://lore.kernel.org/linux-usb/[email protected]
> Suggested-by: Neil Armstrong <[email protected]>
> Signed-off-by: Jameson Thies <[email protected]>
> ---
> Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
> GET_ALTERNATE_MODES still requested identity and cable information.
>
> drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
> drivers/usb/typec/ucsi/ucsi.h | 5 +++--
> 2 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cf52cb34d2859..958dc82989b60 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
> if (ret < 0)
> return ret;
>
> - ret = ucsi_get_cable_identity(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
> + ret = ucsi_get_cable_identity(con);
> + if (ret < 0)
> + return ret;
> + }
>
> - ret = ucsi_register_plug(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
> + ret = ucsi_register_plug(con);
> + if (ret < 0)
> + return ret;
>
> - ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> - if (ret < 0)
> - return ret;
> + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> + if (ret < 0)
> + return ret;
> + }
>
> return 0;
> }
> @@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> - ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> - ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> - ucsi_get_partner_identity(con);
> - ucsi_check_cable(con);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_get_partner_identity(con);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 32daf5f586505..0e7c92eb1b227 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -206,7 +206,7 @@ struct ucsi_capability {
> #define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
> #define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
> u8 num_connectors;
> - u8 features;
> + u16 features;
> #define UCSI_CAP_SET_UOM BIT(0)
> #define UCSI_CAP_SET_PDM BIT(1)
> #define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
> @@ -215,7 +215,8 @@ struct ucsi_capability {
> #define UCSI_CAP_CABLE_DETAILS BIT(5)
> #define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
> #define UCSI_CAP_PD_RESET BIT(7)
> - u16 reserved_1;
> +#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
> + u8 reserved_1;
> u8 num_alt_modes;
> u8 reserved_2;
> u16 bc_version;

LGTM

Tested-by: Neil Armstrong <[email protected]> # on SM8550-QRD
Tested-by: Neil Armstrong <[email protected]> # on SM8650-QRD

Thanks,
Neil

2024-03-18 11:11:49

by Heikki Krogerus

[permalink] [raw]

Subject: Re: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

On Fri, Mar 15, 2024 at 05:18:35PM +0000, Jameson Thies wrote:
> Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
> discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
> sending GET_CABLE_PROPERTY to discover the cable and check
> UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
> move 8 bits from reserved_1 to features in the ucsi_capability struct. This
> makes the field 16 bits, still 8 short of the 24 bits allocated for it in
> UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
> bmOptionalFeatures.
>
> Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
> Link: https://lore.kernel.org/linux-usb/[email protected]
> Suggested-by: Neil Armstrong <[email protected]>
> Signed-off-by: Jameson Thies <[email protected]>

Reviewed-by: Heikki Krogerus <[email protected]>

> ---
> Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
> GET_ALTERNATE_MODES still requested identity and cable information.
>
> drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
> drivers/usb/typec/ucsi/ucsi.h | 5 +++--
> 2 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cf52cb34d2859..958dc82989b60 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
> if (ret < 0)
> return ret;
>
> - ret = ucsi_get_cable_identity(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
> + ret = ucsi_get_cable_identity(con);
> + if (ret < 0)
> + return ret;
> + }
>
> - ret = ucsi_register_plug(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
> + ret = ucsi_register_plug(con);
> + if (ret < 0)
> + return ret;
>
> - ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> - if (ret < 0)
> - return ret;
> + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> + if (ret < 0)
> + return ret;
> + }
>
> return 0;
> }
> @@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> - ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> - ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> - ucsi_get_partner_identity(con);
> - ucsi_check_cable(con);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_get_partner_identity(con);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 32daf5f586505..0e7c92eb1b227 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -206,7 +206,7 @@ struct ucsi_capability {
> #define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
> #define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
> u8 num_connectors;
> - u8 features;
> + u16 features;
> #define UCSI_CAP_SET_UOM BIT(0)
> #define UCSI_CAP_SET_PDM BIT(1)
> #define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
> @@ -215,7 +215,8 @@ struct ucsi_capability {
> #define UCSI_CAP_CABLE_DETAILS BIT(5)
> #define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
> #define UCSI_CAP_PD_RESET BIT(7)
> - u16 reserved_1;
> +#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
> + u8 reserved_1;
> u8 num_alt_modes;
> u8 reserved_2;
> u16 bc_version;
> --
> 2.44.0.291.gc1ea87d7ee-goog

--
heikki

2024-03-25 16:29:40

by Neil Armstrong

[permalink] [raw]

Subject: Re: [PATCH v2 1/1] usb: typec: ucsi: Check capabilities before cable and identity discovery

Hi Greg,

On 15/03/2024 18:18, Jameson Thies wrote:
> Check the UCSI_CAP_GET_PD_MESSAGE bit before sending GET_PD_MESSAGE to
> discover partner and cable identity, check UCSI_CAP_CABLE_DETAILS before
> sending GET_CABLE_PROPERTY to discover the cable and check
> UCSI_CAP_ALT_MODE_DETAILS before registering the a cable plug. Additionally,
> move 8 bits from reserved_1 to features in the ucsi_capability struct. This
> makes the field 16 bits, still 8 short of the 24 bits allocated for it in
> UCSI v3.0, but it will not overflow because UCSI only defines 14 bits in
> bmOptionalFeatures.
>
> Fixes: 38ca416597b0 ("usb: typec: ucsi: Register cables based on GET_CABLE_PROPERTY")
> Link: https://lore.kernel.org/linux-usb/[email protected]
> Suggested-by: Neil Armstrong <[email protected]>
> Signed-off-by: Jameson Thies <[email protected]>

Could you queue this for v6.9-rc2 ? So far most of the recent Qualcomm boards are waiting
this fix to be unbroken.

Thanks,
Neil

> ---
> Confirmed a device which supports GET_PD_MESSAGE, GET_CABLE_PROPERTY and
> GET_ALTERNATE_MODES still requested identity and cable information.
>
> drivers/usb/typec/ucsi/ucsi.c | 34 +++++++++++++++++++++-------------
> drivers/usb/typec/ucsi/ucsi.h | 5 +++--
> 2 files changed, 24 insertions(+), 15 deletions(-)
>
> diff --git a/drivers/usb/typec/ucsi/ucsi.c b/drivers/usb/typec/ucsi/ucsi.c
> index cf52cb34d2859..958dc82989b60 100644
> --- a/drivers/usb/typec/ucsi/ucsi.c
> +++ b/drivers/usb/typec/ucsi/ucsi.c
> @@ -1133,17 +1133,21 @@ static int ucsi_check_cable(struct ucsi_connector *con)
> if (ret < 0)
> return ret;
>
> - ret = ucsi_get_cable_identity(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE) {
> + ret = ucsi_get_cable_identity(con);
> + if (ret < 0)
> + return ret;
> + }
>
> - ret = ucsi_register_plug(con);
> - if (ret < 0)
> - return ret;
> + if (con->ucsi->cap.features & UCSI_CAP_ALT_MODE_DETAILS) {
> + ret = ucsi_register_plug(con);
> + if (ret < 0)
> + return ret;
>
> - ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> - if (ret < 0)
> - return ret;
> + ret = ucsi_register_altmodes(con, UCSI_RECIPIENT_SOP_P);
> + if (ret < 0)
> + return ret;
> + }
>
> return 0;
> }
> @@ -1189,8 +1193,10 @@ static void ucsi_handle_connector_change(struct work_struct *work)
> ucsi_register_partner(con);
> ucsi_partner_task(con, ucsi_check_connection, 1, HZ);
> ucsi_partner_task(con, ucsi_check_connector_capability, 1, HZ);
> - ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> - ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_partner_task(con, ucsi_get_partner_identity, 1, HZ);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_partner_task(con, ucsi_check_cable, 1, HZ);
>
> if (UCSI_CONSTAT_PWR_OPMODE(con->status.flags) ==
> UCSI_CONSTAT_PWR_OPMODE_PD)
> @@ -1589,8 +1595,10 @@ static int ucsi_register_port(struct ucsi *ucsi, struct ucsi_connector *con)
> ucsi_register_partner(con);
> ucsi_pwr_opmode_change(con);
> ucsi_port_psy_changed(con);
> - ucsi_get_partner_identity(con);
> - ucsi_check_cable(con);
> + if (con->ucsi->cap.features & UCSI_CAP_GET_PD_MESSAGE)
> + ucsi_get_partner_identity(con);
> + if (con->ucsi->cap.features & UCSI_CAP_CABLE_DETAILS)
> + ucsi_check_cable(con);
> }
>
> /* Only notify USB controller if partner supports USB data */
> diff --git a/drivers/usb/typec/ucsi/ucsi.h b/drivers/usb/typec/ucsi/ucsi.h
> index 32daf5f586505..0e7c92eb1b227 100644
> --- a/drivers/usb/typec/ucsi/ucsi.h
> +++ b/drivers/usb/typec/ucsi/ucsi.h
> @@ -206,7 +206,7 @@ struct ucsi_capability {
> #define UCSI_CAP_ATTR_POWER_OTHER BIT(10)
> #define UCSI_CAP_ATTR_POWER_VBUS BIT(14)
> u8 num_connectors;
> - u8 features;
> + u16 features;
> #define UCSI_CAP_SET_UOM BIT(0)
> #define UCSI_CAP_SET_PDM BIT(1)
> #define UCSI_CAP_ALT_MODE_DETAILS BIT(2)
> @@ -215,7 +215,8 @@ struct ucsi_capability {
> #define UCSI_CAP_CABLE_DETAILS BIT(5)
> #define UCSI_CAP_EXT_SUPPLY_NOTIFICATIONS BIT(6)
> #define UCSI_CAP_PD_RESET BIT(7)
> - u16 reserved_1;
> +#define UCSI_CAP_GET_PD_MESSAGE BIT(8)
> + u8 reserved_1;
> u8 num_alt_modes;
> u8 reserved_2;
> u16 bc_version;

2024-03-27 01:46:37

by Bjorn Andersson

[permalink] [raw]