Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751275AbdH0Gte (ORCPT ); Sun, 27 Aug 2017 02:49:34 -0400 Received: from mail-pg0-f49.google.com ([74.125.83.49]:32867 "EHLO mail-pg0-f49.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1750797AbdH0Gtc (ORCPT ); Sun, 27 Aug 2017 02:49:32 -0400 X-Google-Smtp-Source: ADKCNb79+bbIedKEsLrU8T3jkiMEEQQir/st0nqX93VUomVD+9YmePndfJJDxMnDe1GErVmkIJuwiA== From: Badhri Jagan Sridharan X-Google-Original-From: Badhri Jagan Sridharan To: Guenter Roeck , Greg Kroah-Hartman Cc: devel@driverdev.osuosl.org, linux-kernel@vger.kernel.org, Badhri Jagan Sridharan Subject: [PATCH 06/11 v2] staging: typec: tcpm: Comply with TryWait.SNK State Date: Sat, 26 Aug 2017 23:49:21 -0700 Message-Id: <20170827064921.2931-1-Badhri@google.com> X-Mailer: git-send-email 2.14.1.342.g6490525c54-goog Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3886 Lines: 119 According to the spec: "4.5.2.2.10.2 Exiting from TryWait.SNK State The port shall transition to Attached.SNK after tCCDebounce if or when VBUS is detected. Note the Source may initiate USB PD communications which will cause brief periods of the SNK.Open state on both the CC1 and CC2 pins, but this event will not exceed tPDDebounce. The port shall transition to Unattached.SNK when the state of both of the CC1 and CC2 pins is SNK.Open for at least tPDDebounce." Signed-off-by: Badhri Jagan Sridharan --- Changelog since v1: - Corrected tag drivers/staging/typec/tcpm.c | 58 +++++++++++++++++++++++--------------------- 1 file changed, 30 insertions(+), 28 deletions(-) diff --git a/drivers/staging/typec/tcpm.c b/drivers/staging/typec/tcpm.c index fc179bdea7e4..0ae33330a5c7 100644 --- a/drivers/staging/typec/tcpm.c +++ b/drivers/staging/typec/tcpm.c @@ -2403,26 +2403,24 @@ static void run_state_machine(struct tcpm_port *port) break; case SNK_TRYWAIT: tcpm_set_cc(port, TYPEC_CC_RD); - tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, PD_T_CC_DEBOUNCE); + tcpm_set_state(port, SNK_TRYWAIT_VBUS, PD_T_CC_DEBOUNCE); break; - case SNK_TRYWAIT_DEBOUNCE: - if (port->vbus_present) { + case SNK_TRYWAIT_VBUS: + /* + * TCPM stays in this state indefinitely until VBUS + * is detected as long as Rp is not detected for + * more than a time period of tPDDebounce. + */ + if (port->vbus_present && tcpm_port_is_sink(port)) { tcpm_set_state(port, SNK_ATTACHED, 0); break; } - if (tcpm_port_is_disconnected(port)) { - tcpm_set_state(port, SNK_UNATTACHED, - PD_T_PD_DEBOUNCE); - break; - } - if (tcpm_port_is_source(port)) - tcpm_set_state(port, SRC_ATTACHED, 0); - /* XXX Are we supposed to stay in this state ? */ + if (!tcpm_port_is_sink(port)) + tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0); break; - case SNK_TRYWAIT_VBUS: - tcpm_set_state(port, SNK_ATTACHED, PD_T_CC_DEBOUNCE); + case SNK_TRYWAIT_DEBOUNCE: + tcpm_set_state(port, SNK_UNATTACHED, PD_T_PD_DEBOUNCE); break; - case SNK_ATTACHED: ret = tcpm_snk_attach(port); if (ret < 0) @@ -2960,19 +2958,16 @@ static void _tcpm_cc_change(struct tcpm_port *port, enum typec_cc_status cc1, tcpm_set_state(port, SRC_TRY_WAIT, 0); break; case SNK_TRYWAIT_DEBOUNCE: - if (port->vbus_present) { - tcpm_set_state(port, SNK_ATTACHED, 0); - break; - } - if (tcpm_port_is_source(port)) { - tcpm_set_state(port, SRC_ATTACHED, 0); - break; - } - if (tcpm_port_is_disconnected(port) && - port->delayed_state != SNK_UNATTACHED) + if (tcpm_port_is_sink(port)) + tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0); + break; + case SNK_TRYWAIT_VBUS: + if (!tcpm_port_is_sink(port)) tcpm_set_state(port, SNK_TRYWAIT_DEBOUNCE, 0); break; - + case SNK_TRYWAIT: + /* Do nothing, waiting for tCCDebounce */ + break; case PR_SWAP_SNK_SRC_SINK_OFF: case PR_SWAP_SRC_SNK_TRANSITION_OFF: case PR_SWAP_SRC_SNK_SOURCE_OFF: @@ -3030,7 +3025,14 @@ static void _tcpm_pd_vbus_on(struct tcpm_port *port) /* Do nothing, waiting for PD_DEBOUNCE to do be done */ break; case SNK_TRYWAIT: - tcpm_set_state(port, SNK_TRYWAIT_VBUS, 0); + /* Do nothing, waiting for tCCDebounce */ + break; + case SNK_TRYWAIT_VBUS: + if (tcpm_port_is_sink(port)) + tcpm_set_state(port, SNK_ATTACHED, 0); + break; + case SNK_TRYWAIT_DEBOUNCE: + /* Do nothing, waiting for Rp */ break; case SRC_TRY_WAIT: case SRC_TRY_DEBOUNCE: @@ -3067,10 +3069,10 @@ static void _tcpm_pd_vbus_off(struct tcpm_port *port) case SNK_TRY_WAIT_DEBOUNCE: /* Do nothing, waiting for PD_DEBOUNCE to do be done */ break; + case SNK_TRYWAIT: case SNK_TRYWAIT_VBUS: - tcpm_set_state(port, SNK_TRYWAIT, 0); + case SNK_TRYWAIT_DEBOUNCE: break; - case SNK_ATTACH_WAIT: tcpm_set_state(port, SNK_UNATTACHED, 0); break; -- 2.14.1.342.g6490525c54-goog