From: Heikki Krogerus <heikki.krogerus@linux.intel.com>
To: Badhri Jagan Sridharan <badhri@google.com>
Cc: Guenter Roeck <linux@roeck-us.net>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org
Subject: Re: [PATCH v6 03/14] usb: typec: tcpci: update ROLE_CONTROL for DRP
Date: Tue, 15 Sep 2020 15:12:16 +0300 [thread overview]
Message-ID: <20200915121216.GD1139641@kuha.fi.intel.com> (raw)
In-Reply-To: <20200901025927.3596190-4-badhri@google.com>
On Mon, Aug 31, 2020 at 07:59:16PM -0700, Badhri Jagan Sridharan wrote:
> ROLE_CONTROL register would not have the actual CC terminations
> unless the port does not set ROLE_CONTROL.DRP. For DRP ports,
> CC_STATUS.cc1/cc2 indicates the final terminations applied
> when TCPC enters potential_connect_as_source/_sink.
> For DRP ports, infer port role from CC_STATUS and set corresponding
> CC terminations before setting the orientation.
>
> Signed-off-by: Badhri Jagan Sridharan <badhri@google.com>
Reviewed-by: Heikki Krogerus <heikki.krogerus@linux.intel.com>
> ---
> Changes since v1:
> - Changing patch version to v6 to fix version number confusion.
> ---
> drivers/usb/typec/tcpm/tcpci.c | 37 +++++++++++++++++++++++++++++++++-
> 1 file changed, 36 insertions(+), 1 deletion(-)
>
> diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c
> index 7d36d5e2d3f7..7d9491ba62fb 100644
> --- a/drivers/usb/typec/tcpm/tcpci.c
> +++ b/drivers/usb/typec/tcpm/tcpci.c
> @@ -191,12 +191,47 @@ static int tcpci_set_polarity(struct tcpc_dev *tcpc,
> struct tcpci *tcpci = tcpc_to_tcpci(tcpc);
> unsigned int reg;
> int ret;
> + enum typec_cc_status cc1, cc2;
>
> - /* Keep the disconnect cc line open */
> + /* Obtain Rp setting from role control */
> ret = regmap_read(tcpci->regmap, TCPC_ROLE_CTRL, ®);
> if (ret < 0)
> return ret;
>
> + ret = tcpci_get_cc(tcpc, &cc1, &cc2);
> + if (ret < 0)
> + return ret;
> +
> + /*
> + * When port has drp toggling enabled, ROLE_CONTROL would only have the initial
> + * terminations for the toggling and does not indicate the final cc
> + * terminations when ConnectionResult is 0 i.e. drp toggling stops and
> + * the connection is resolbed. Infer port role from TCPC_CC_STATUS based on the
> + * terminations seen. The port role is then used to set the cc terminations.
> + */
> + if (reg & TCPC_ROLE_CTRL_DRP) {
> + /* Disable DRP for the OPEN setting to take effect */
> + reg = reg & ~TCPC_ROLE_CTRL_DRP;
> +
> + if (polarity == TYPEC_POLARITY_CC2) {
> + reg &= ~(TCPC_ROLE_CTRL_CC2_MASK << TCPC_ROLE_CTRL_CC2_SHIFT);
> + /* Local port is source */
> + if (cc2 == TYPEC_CC_RD)
> + /* Role control would have the Rp setting when DRP was enabled */
> + reg |= TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC2_SHIFT;
> + else
> + reg |= TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC2_SHIFT;
> + } else {
> + reg &= ~(TCPC_ROLE_CTRL_CC1_MASK << TCPC_ROLE_CTRL_CC1_SHIFT);
> + /* Local port is source */
> + if (cc1 == TYPEC_CC_RD)
> + /* Role control would have the Rp setting when DRP was enabled */
> + reg |= TCPC_ROLE_CTRL_CC_RP << TCPC_ROLE_CTRL_CC1_SHIFT;
> + else
> + reg |= TCPC_ROLE_CTRL_CC_RD << TCPC_ROLE_CTRL_CC1_SHIFT;
> + }
> + }
> +
> if (polarity == TYPEC_POLARITY_CC2)
> reg |= TCPC_ROLE_CTRL_CC_OPEN << TCPC_ROLE_CTRL_CC1_SHIFT;
> else
> --
> 2.28.0.402.g5ffc5be6b7-goog
--
heikki
next prev parent reply other threads:[~2020-09-15 12:14 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-01 2:59 [PATCH v6 00/14] TCPM support for FRS and AutoDischarge Disconnect Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 01/14] usb: typec: tcpci: Add register definitions to tcpci Badhri Jagan Sridharan
2020-09-15 12:10 ` Heikki Krogerus
2020-09-01 2:59 ` [PATCH v6 02/14] usb: typec: tcpci: Add support when hidden tx registers are inaccessible Badhri Jagan Sridharan
2020-09-15 12:11 ` Heikki Krogerus
2020-09-01 2:59 ` [PATCH v6 03/14] usb: typec: tcpci: update ROLE_CONTROL for DRP Badhri Jagan Sridharan
2020-09-15 12:12 ` Heikki Krogerus [this message]
2020-09-01 2:59 ` [PATCH v6 04/14] usb: typec: tcpci: Add a getter method to retrieve tcpm_port reference Badhri Jagan Sridharan
2020-09-15 12:16 ` Heikki Krogerus
2020-09-01 2:59 ` [PATCH v6 05/14] usb: typec: tcpci: Add set_vbus tcpci callback Badhri Jagan Sridharan
2020-09-15 12:22 ` Heikki Krogerus
2020-09-16 9:07 ` Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 06/14] dt-bindings: usb: Maxim type-c controller device tree binding document Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 07/14] usb: typec: tcpci_maxim: Chip level TCPC driver Badhri Jagan Sridharan
2020-09-15 12:43 ` Heikki Krogerus
2020-09-16 9:34 ` Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 08/14] dt-bindings: connector: Add property to set initial current cap for FRS Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 09/14] usb: typec: tcpm: Add support for Sink Fast Role SWAP(FRS) Badhri Jagan Sridharan
2020-09-15 13:20 ` Heikki Krogerus
2020-09-17 10:23 ` Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 10/14] usb: typec: tcpci: Implement callbacks for FRS Badhri Jagan Sridharan
2020-09-15 13:23 ` Heikki Krogerus
2020-09-01 2:59 ` [PATCH v6 11/14] usb: typec: tcpci_maxim: Add support for Sink FRS Badhri Jagan Sridharan
2020-09-15 13:25 ` Heikki Krogerus
2020-09-01 2:59 ` [PATCH v6 12/14] usb: typec: tcpm: Implement enabling Auto Discharge disconnect support Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 13/14] usb: typec: tcpci: Implement Auto discharge disconnect callbacks Badhri Jagan Sridharan
2020-09-01 2:59 ` [PATCH v6 14/14] usb: typec: tcpci_maxim: Implemnent set_auto_vbus_discharge_threshold Badhri Jagan Sridharan
2020-09-15 12:09 ` [PATCH v6 00/14] TCPM support for FRS and AutoDischarge Disconnect Heikki Krogerus
2020-09-15 16:57 ` Badhri Jagan Sridharan
2020-09-15 13:33 ` Heikki Krogerus
2020-09-15 16:59 ` Badhri Jagan Sridharan
2020-09-16 11:05 ` Greg Kroah-Hartman
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