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SubjectRe: [PATCH v10 11/15] usb: typec: tcpci_max77759: Fix vbus stuck on upon diconnecting sink
On Wed, Oct 07, 2020 at 11:15:52PM -0700, Badhri Jagan Sridharan wrote:
> Occasionally, POWER_STATUS.sourcing_vbus takes a while to clear after
> writing to MAX_BUCK_BOOST_OP register. This causes vbus to turn back
> on while disconnecting the sink. Overcome this issue by writing into
> MAX_BUCK_BOOST_OP during frs while sourcing vbu, instead of always
> into the register whenever POWER_STATUS.sourcing_vbus is set.
>
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>

Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>

> ---
> v9 is the first version of this patch. Added to fix
> occasional bug of vbus turning back on when disconnecting the FRS accessory
> after disconnect. No changes since v9.
> ---
> drivers/usb/typec/tcpm/tcpci_maxim.c | 28 ++++++++++++++--------------
> 1 file changed, 14 insertions(+), 14 deletions(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci_maxim.c b/drivers/usb/typec/tcpm/tcpci_maxim.c
> index 723d7dd38f75..43dcad95e897 100644
> --- a/drivers/usb/typec/tcpm/tcpci_maxim.c
> +++ b/drivers/usb/typec/tcpm/tcpci_maxim.c
> @@ -238,23 +238,22 @@ static void process_power_status(struct max_tcpci_chip *chip)
> if (ret < 0)
> return;
>
> - if (pwr_status == 0xff) {
> + if (pwr_status == 0xff)
> max_tcpci_init_regs(chip);
> - } else if (pwr_status & TCPC_POWER_STATUS_SOURCING_VBUS) {
> + else if (pwr_status & TCPC_POWER_STATUS_SOURCING_VBUS)
> tcpm_sourcing_vbus(chip->port);
> - /*
> - * Alawys re-enable boost here.
> - * In normal case, when say an headset is attached, TCPM would
> - * have instructed to TCPC to enable boost, so the call is a
> - * no-op.
> - * But for Fast Role Swap case, Boost turns on autonomously without
> - * AP intervention, but, needs AP to enable source mode explicitly
> - * for AP to regain control.
> - */
> - max_tcpci_set_vbus(chip->tcpci, &chip->data, true, false);
> - } else {
> + else
> tcpm_vbus_change(chip->port);
> - }
> +}
> +
> +static void max_tcpci_frs_sourcing_vbus(struct tcpci *tcpci, struct tcpci_data *tdata)
> +{
> + /*
> + * For Fast Role Swap case, Boost turns on autonomously without
> + * AP intervention, but, needs AP to enable source mode explicitly
> + * for AP to regain control.
> + */
> + max_tcpci_set_vbus(tcpci, tdata, true, false);
> }
>
> static void process_tx(struct max_tcpci_chip *chip, u16 status)
> @@ -441,6 +440,7 @@ static int max_tcpci_probe(struct i2c_client *client, const struct i2c_device_id
> chip->data.start_drp_toggling = max_tcpci_start_toggling;
> chip->data.TX_BUF_BYTE_x_hidden = true;
> chip->data.init = tcpci_init;
> + chip->data.frs_sourcing_vbus = max_tcpci_frs_sourcing_vbus;
>
> max_tcpci_init_regs(chip);
> chip->tcpci = tcpci_register_port(chip->dev, &chip->data);
> --
> 2.28.0.806.g8561365e88-goog

--
heikki

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