From patchwork Thu Oct 31 23:59:54 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Amit Sunil Dhamne X-Patchwork-Id: 840068 Received: from mail-yw1-f202.google.com (mail-yw1-f202.google.com [209.85.128.202]) (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 17D9149620 for ; Fri, 1 Nov 2024 00:00:12 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=209.85.128.202 ARC-Seal: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730419220; cv=none; b=u3m+uqjRG10hdU8vFx5goz9at9KmyDEg6bDw8kW4yd0a44bDCaJD1lT03vvJgfv9s8hOTmgApz6XQXaC4NocDpz3n0NJQaMvwdpTKwXHB5y+dWfvBpfnrNvKaKH4X1ACAhPq/dSKrguSmDJqR61qlSH+pmasO+W5OYhgUNzo700= ARC-Message-Signature: i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1730419220; c=relaxed/simple; bh=GcFamxwRDGPO3itT2MjcU3zPO7i7GG6u7AIRa1Q7oFg=; h=Date:In-Reply-To:Mime-Version:References:Message-ID:Subject:From: To:Cc:Content-Type; b=qaUS3ZkQ7XK3F/VaZsTyRxHX1gCq9V+Lk1W3rNPhz00J1JJ13osHpSN18vp3ixCwNduJ9SIv62voALy6YMx45l2bsgDVJDCyvOfltpDf4ByAia9MpjfhMJuxyaHlSwuAd2Xfar+sZZOpooS23EUGiIiaNCBUnqIA3EG8+YHZeto= ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dmarc=pass (p=reject dis=none) header.from=google.com; spf=pass smtp.mailfrom=flex--amitsd.bounces.google.com; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b=Yu24/i3q; arc=none smtp.client-ip=209.85.128.202 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--amitsd.bounces.google.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Yu24/i3q" Received: by mail-yw1-f202.google.com with SMTP id 00721157ae682-6e3705b2883so32794937b3.3 for ; Thu, 31 Oct 2024 17:00:12 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1730419212; x=1731024012; darn=vger.kernel.org; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:from:to:cc:subject:date:message-id:reply-to; bh=dQqXD8GGG81ZKLR68lhIbs8UaEvihWRfJOeJXcvzgOs=; b=Yu24/i3q5aG87jJNVFOLjAvr9E/GVFHnfn6/TF7u/pE76/AgiMniNJUL2i5ISehmsB Y0kHnmu/Z7eRdKr2/TkiHmwv9hoO/MWlaoKCZN1dj2EEe0Y81JXwl1aRyOiU1jfeUQjN k7+Ep9Gt3ru1e2C1BeAeMKRa1u93JwaKB2btQgNxTdFAvhDyrB9xv0kdjzEZzY1IM8tj Sd0Fs/q08Efin4rt6VZ6QftLp1xlRxnThdUaOVyH6b3y5RdyRL22h47HW8YzhNtwPBQz 5IUS87z314a/4/LxJrgKQpXm6EJpQPPWs5t9w77I+spAKAzY7qxlg6ZMq5J8zIKowgsy /MdQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1730419212; x=1731024012; h=cc:to:from:subject:message-id:references:mime-version:in-reply-to :date:x-gm-message-state:from:to:cc:subject:date:message-id:reply-to; bh=dQqXD8GGG81ZKLR68lhIbs8UaEvihWRfJOeJXcvzgOs=; b=a9aJuuVYnuEBTybpZ0n1qJIxc2J7syKgK5mNX+tY6/0rqF4AtGyRAB8cHep0l2Z+EG ATl/RM01sDi5SBETJDo5s3HnV66mAoWq35sPJ+y03kn+Rs1azjwF4qysjsidPjNLRkjr 28Yii2b+nJkjZH+L7g2N/djkL2HKfO/4cSafuMPSqGNH6G9HqVHr1srVqFwoK4MM6nRG mgjON7vTaQG0Fd/r5OtGYqOK1vpt3dRnf4ldlVnGMw546bKmWyBsS34JpnLYc6P12k4f Z0CrjAVslVaLHay7EdgpuyEDmHuzTGa/4aD9pEL2SZWUph12d+nTv3VjiEC8jbSiqp5B iVPQ== X-Forwarded-Encrypted: i=1; AJvYcCXZOUjZ4Ey3rqEhAEj4PxFmVKSyZMvc7O60z7BBYg1wIgqQlp2g9y13ub/Uox9szRD8Q5pJoiiiPE0=@vger.kernel.org X-Gm-Message-State: AOJu0YxcJjTrHmwUa5kjBmVSf/VX1gicjJzW55l4zt0AF1POym3rGry3 EI76k8r7aOLc7shvoguvCrl0Ixgxy8Z0YrMMhYRMrxG5uA1Q/70JVxYnor87QIH77N4Iy+pG27n rVA== X-Google-Smtp-Source: AGHT+IF3kA3CN/HGj+QhxHeBH2gUZC8UXb3P2uSWUlJKoBcrreHMjjN4zZ3Ex75VcC0umN5SfVTmaiZ0oxw= X-Received: from amitsd-gti.c.googlers.com ([fda3:e722:ac3:cc00:20:ed76:c0a8:827]) (user=amitsd job=sendgmr) by 2002:a05:690c:2e8f:b0:6ea:fa4:a365 with SMTP id 00721157ae682-6ea64c11f97mr45177b3.8.1730419212131; Thu, 31 Oct 2024 17:00:12 -0700 (PDT) Date: Thu, 31 Oct 2024 16:59:54 -0700 In-Reply-To: <20241031235957.1261244-1-amitsd@google.com> Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 References: <20241031235957.1261244-1-amitsd@google.com> X-Mailer: git-send-email 2.47.0.199.ga7371fff76-goog Message-ID: <20241031235957.1261244-4-amitsd@google.com> Subject: [PATCH v1 3/3] usb: typec: tcpm: Add support for sink-bc12-completion-time-ms DT property From: Amit Sunil Dhamne To: robh@kernel.org, krzk+dt@kernel.org, conor+dt@kernel.org, gregkh@linuxfoundation.org, heikki.krogerus@linux.intel.com Cc: dmitry.baryshkov@linaro.org, kyletso@google.com, rdbabiera@google.com, badhri@google.com, linux@roeck-us.net, xu.yang_2@nxp.com, devicetree@vger.kernel.org, linux-kernel@vger.kernel.org, linux-usb@vger.kernel.org, Amit Sunil Dhamne Add support for parsing DT time property "sink-bc12-completion-time-ms". This timer is used to relax the PD state machine during Sink attach to allow completion of Battery Charging (BC1.2) charger type detection in TCPC before PD negotiations. BC1.2 detection is a hardware mechanism to detect charger port type that is run by some conrollers (such as "maxim,max33359") in parallel to Type-C connection state machines. This is to ensure that BC1.2 completes before PD is enabled as running BC1.2 in parallel with PD negotiation results in delays violating timer constraints in PD spec. This is an optional timer and will not add any delay unless explicitly set. Signed-off-by: Amit Sunil Dhamne Reviewed-by: Badhri Jagan Sridharan --- drivers/usb/typec/tcpm/tcpm.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index b3d5d1d48937..8b325b93b5a9 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -319,6 +319,7 @@ struct pd_timings { u32 sink_wait_cap_time; u32 ps_src_off_time; u32 cc_debounce_time; + u32 snk_bc12_cmpletion_time; }; struct tcpm_port { @@ -4978,7 +4979,16 @@ static void run_state_machine(struct tcpm_port *port) if (ret < 0) tcpm_set_state(port, SNK_UNATTACHED, 0); else - tcpm_set_state(port, SNK_STARTUP, 0); + /* + * For Type C port controllers that use Battery Charging + * Detection (based on BCv1.2 spec) to detect USB + * charger type, add a delay of "snk_bc12_cmpletion_time" + * before transitioning to SNK_STARTUP to allow BC1.2 + * detection to complete before PD is eventually enabled + * in later states. + */ + tcpm_set_state(port, SNK_STARTUP, + port->timings.snk_bc12_cmpletion_time); break; case SNK_STARTUP: opmode = tcpm_get_pwr_opmode(port->polarity ? @@ -7090,6 +7100,10 @@ static void tcpm_fw_get_timings(struct tcpm_port *port, struct fwnode_handle *fw port->timings.cc_debounce_time = val; else port->timings.cc_debounce_time = PD_T_CC_DEBOUNCE; + + ret = fwnode_property_read_u32(fwnode, "sink-bc12-completion-time-ms", &val); + if (!ret) + port->timings.snk_bc12_cmpletion_time = val; } static int tcpm_fw_get_caps(struct tcpm_port *port, struct fwnode_handle *fwnode)