From nobody Tue Dec 16 07:10:50 2025 Received: from mail-pl1-f201.google.com (mail-pl1-f201.google.com [209.85.214.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 9D44B13C3D5 for ; Tue, 14 Jan 2025 14:23:51 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.214.201 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736864634; cv=none; b=fbbMZx5uaMX0oETp8TpOnfgrGoTl6T0Mv6Tu9IGgC6/pJxlrAv0ujjmQV+D0T9upVhHWipSu9Ag350SjBkNXPQI2oEZOi8raTUlunSyh8EG9MUDeTAJWMkdPWJubuOg0k2I7Kv+iRRZgqlGZmDjGoqh+7lnCpCayhojqWI5E9Y8= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1736864634; c=relaxed/simple; bh=3mZhZEpsVXvbK8kRBz620qSwc7gVFgby48NhPbc9xTE=; h=Date:Mime-Version:Message-ID:Subject:From:To:Cc:Content-Type; b=uTW5ElGrTJtL/nj8gDFpM2Nl1sK3kz7aw9wf4/Kh21PeECSKHswgF+qzA8hGRmkigT2LMpMXF+VvKxGBGmjDOfiymkuZ+q4jCntZPIxrZvNtMEcIPOC+M9H8Qkt/0XoV6KRqHc0xDep8ji34ViuIT1fG8O9j7yRMYIukTockbyE= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--kyletso.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=ioYRyRHj; arc=none smtp.client-ip=209.85.214.201 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=flex--kyletso.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="ioYRyRHj" Received: by mail-pl1-f201.google.com with SMTP id d9443c01a7336-21681a2c0d5so99814085ad.2 for ; Tue, 14 Jan 2025 06:23:51 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1736864631; x=1737469431; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=tSu4xp3Y6HOXZlKWn+sVDCe4JiYP/94emAGWE5skEzM=; b=ioYRyRHj+T2OW6nUmDqzOD4h+ES+NaJcTUebGX2sykWQPciJ8BwVdiDMZwUDD4QoU2 tb4nbFsiDOMW1b7jOejdaMYO9KM1FaXh5GjXqoFAHYG42zDClQKXn809+j9tsuPlBYBM 8a88uiHrMRu/MF/icu11OcV2bom6+zGXedkSdERbP/PytOyInLTP6pfPEHpemAvwXmH+ N8z4Ft+rxOWlaMe89bSRdVjBFhuFNRrz57PoKTIKcUE+7v+dqr1BDD7ebgnBt/tz3FSD Zztmm/mFfgpX4Fg1KZoV/tC6OIDEmeo58cqC3iVhwc7M+uVWyU5aV4rAvlzzfWi6Ftkg tfnw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1736864631; x=1737469431; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=tSu4xp3Y6HOXZlKWn+sVDCe4JiYP/94emAGWE5skEzM=; b=F9IhZ5V1GcYbhjZA36Kb55VKGrSR6gy9BEtDeQnTXMs0gegQhie+A3i++PqOrt3ApG TKiHNBaclKTAYCW4NHKlRknJ8e8PfRLRT2MOHabGwKFtTBbFAD1RS0axCNaraJaci5Ay N1pP22pVBlsUJH8J3JdBUJDxouxdj+ZcArftfdWnVSfiFytGEVO6hmVqEwCOaqPH6URq U8evu7CC6KQtfsWcEjHpiHx/3FWCGj5ovoUIEwBSLnSGJ6AOBBMJ71cx0KGLSJsqoDov MoRM46v1Gh1iLRgh86P3dCPqpLPQrjnppaDyy21kFex9Om1Cmhs9vOZWQuqFQjygucEe 1hqA== X-Gm-Message-State: AOJu0YzRxzWdzFCYwiZVS0zKjtAIVk1AHignAVieuNWYjad6ihcz0ScS Vo18zF25OFtf2vJR9AhzJhDMOZ/HwOksLVoiX/WHyF5ZTXYzFGKaBL4ecJki89e6wE9IhbHHC5n zS+SV8w== X-Google-Smtp-Source: AGHT+IHxhLIQFsKmIc6uIHglcMCVZJCSh0/6xS6b9sGYCM4heh8hBWJaOt/VQqM4nlAnjoGXCxNZMbBRcE3o X-Received: from pgba33.prod.google.com ([2002:a63:4d21:0:b0:7fd:40dd:869f]) (user=kyletso job=prod-delivery.src-stubby-dispatcher) by 2002:a17:902:d481:b0:212:6187:6a76 with SMTP id d9443c01a7336-21a83f4d7c8mr402711895ad.14.1736864631009; Tue, 14 Jan 2025 06:23:51 -0800 (PST) Date: Tue, 14 Jan 2025 22:23:39 +0800 Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.47.1.688.g23fc6f90ad-goog Message-ID: <20250114142339.2093399-1-kyletso@google.com> Subject: [PATCH v1] usb: typec: tcpci: Prevent Sink disconnection before vPpsShutdown in SPR PPS From: Kyle Tso To: heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org, andre.draszik@linaro.org, rdbabiera@google.com, m.felsch@pengutronix.de, xu.yang_2@nxp.com, u.kleine-koenig@baylibre.com, emanuele.ghidoli@toradex.com Cc: linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Kyle Tso , stable@vger.kernel.org Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset="utf-8" The Source can drop its output voltage to the minimum of the requested PPS APDO voltage range when it is in Current Limit Mode. If this voltage falls within the range of vPpsShutdown, the Source initiates a Hard Reset and discharges Vbus. However, currently the Sink may disconnect before the voltage reaches vPpsShutdown, leading to unexpected behavior. Prevent premature disconnection by setting the Sink's disconnect threshold to the minimum vPpsShutdown value. Additionally, consider the voltage drop due to IR drop when calculating the appropriate threshold. This ensures a robust and reliable interaction between the Source and Sink during SPR PPS Current Limit Mode operation. Fixes: 4288debeaa4e ("usb: typec: tcpci: Fix up sink disconnect thresholds = for PD") Cc: stable@vger.kernel.org Signed-off-by: Kyle Tso --- drivers/usb/typec/tcpm/tcpci.c | 13 +++++++++---- drivers/usb/typec/tcpm/tcpm.c | 8 +++++--- include/linux/usb/tcpm.h | 3 ++- 3 files changed, 16 insertions(+), 8 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpci.c b/drivers/usb/typec/tcpm/tcpci.c index 48762508cc86..19ab6647af70 100644 --- a/drivers/usb/typec/tcpm/tcpci.c +++ b/drivers/usb/typec/tcpm/tcpci.c @@ -27,6 +27,7 @@ #define VPPS_NEW_MIN_PERCENT 95 #define VPPS_VALID_MIN_MV 100 #define VSINKDISCONNECT_PD_MIN_PERCENT 90 +#define VPPS_SHUTDOWN_MIN_PERCENT 85 =20 struct tcpci { struct device *dev; @@ -366,7 +367,8 @@ static int tcpci_enable_auto_vbus_discharge(struct tcpc= _dev *dev, bool enable) } =20 static int tcpci_set_auto_vbus_discharge_threshold(struct tcpc_dev *dev, e= num typec_pwr_opmode mode, - bool pps_active, u32 requested_vbus_voltage_mv) + bool pps_active, u32 requested_vbus_voltage_mv, + u32 apdo_min_voltage_mv) { struct tcpci *tcpci =3D tcpc_to_tcpci(dev); unsigned int pwr_ctrl, threshold =3D 0; @@ -388,9 +390,12 @@ static int tcpci_set_auto_vbus_discharge_threshold(str= uct tcpc_dev *dev, enum ty threshold =3D AUTO_DISCHARGE_DEFAULT_THRESHOLD_MV; } else if (mode =3D=3D TYPEC_PWR_MODE_PD) { if (pps_active) - threshold =3D ((VPPS_NEW_MIN_PERCENT * requested_vbus_voltage_mv / 100)= - - VSINKPD_MIN_IR_DROP_MV - VPPS_VALID_MIN_MV) * - VSINKDISCONNECT_PD_MIN_PERCENT / 100; + /* + * To prevent disconnect when the source is in Current Limit Mode. + * Set the threshold to the lowest possible voltage vPpsShutdown (min) + */ + threshold =3D VPPS_SHUTDOWN_MIN_PERCENT * apdo_min_voltage_mv / 100 - + VSINKPD_MIN_IR_DROP_MV; else threshold =3D ((VSRC_NEW_MIN_PERCENT * requested_vbus_voltage_mv / 100)= - VSINKPD_MIN_IR_DROP_MV - VSRC_VALID_MIN_MV) * diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 460dbde9fe22..e4b85a09c3ae 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -2973,10 +2973,12 @@ static int tcpm_set_auto_vbus_discharge_threshold(s= truct tcpm_port *port, return 0; =20 ret =3D port->tcpc->set_auto_vbus_discharge_threshold(port->tcpc, mode, p= ps_active, - requested_vbus_voltage); + requested_vbus_voltage, + port->pps_data.min_volt); tcpm_log_force(port, - "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u = ret:%d", - mode, pps_active ? 'y' : 'n', requested_vbus_voltage, ret); + "set_auto_vbus_discharge_threshold mode:%d pps_active:%c vbus:%u = pps_apdo_min_volt:%u ret:%d", + mode, pps_active ? 'y' : 'n', requested_vbus_voltage, + port->pps_data.min_volt, ret); =20 return ret; } diff --git a/include/linux/usb/tcpm.h b/include/linux/usb/tcpm.h index 061da9546a81..b22e659f81ba 100644 --- a/include/linux/usb/tcpm.h +++ b/include/linux/usb/tcpm.h @@ -163,7 +163,8 @@ struct tcpc_dev { void (*frs_sourcing_vbus)(struct tcpc_dev *dev); int (*enable_auto_vbus_discharge)(struct tcpc_dev *dev, bool enable); int (*set_auto_vbus_discharge_threshold)(struct tcpc_dev *dev, enum typec= _pwr_opmode mode, - bool pps_active, u32 requested_vbus_voltage); + bool pps_active, u32 requested_vbus_voltage, + u32 pps_apdo_min_voltage); bool (*is_vbus_vsafe0v)(struct tcpc_dev *dev); void (*set_partner_usb_comm_capable)(struct tcpc_dev *dev, bool enable); void (*check_contaminant)(struct tcpc_dev *dev); --=20 2.47.1.688.g23fc6f90ad-goog