From patchwork Thu Nov 16 08:32:16 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Guan-Yu Lin X-Patchwork-Id: 13457707 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=google.com header.i=@google.com header.b="Xz4ssHLT" Received: from mail-pj1-x104a.google.com (mail-pj1-x104a.google.com [IPv6:2607:f8b0:4864:20::104a]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id B5E6F19B for ; Thu, 16 Nov 2023 00:32:47 -0800 (PST) Received: by mail-pj1-x104a.google.com with SMTP id 98e67ed59e1d1-280465be3c9so635756a91.1 for ; Thu, 16 Nov 2023 00:32:47 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=20230601; t=1700123567; x=1700728367; darn=vger.kernel.org; h=cc:to:from:subject:message-id:mime-version:date:from:to:cc:subject :date:message-id:reply-to; bh=31bn3B5X8I0gch6WfMuHeSex2F8MyGxZRscHzn524C8=; b=Xz4ssHLTUhOVFxm8GT+WxnZh2sFM3LwE91GD+RtCGakdgX7qGmpqvhbLAo0dlWnmnU HP6uV5kTqR0NwmbtGDm2ZhhPRi5rMyf++bGwn9hATh41ILDdlyQYZtOAMm6h1HWT1d8S IEnKoZfoL0ED10jgvlRYZ8q9G1XSC4+Ju89VpgGWGaJm8IcnZzFDKBJe2g+iB06S7LUy aWScEL7LOEZ/J85E+8CZQAt53wtsBhs9t9O4oGSd2J3csxjX1LIGm/x5PDmWJcG+8jtf 5C7TeJyF+toucHvTQ0fw3Spm3mfBxJADAQWx3KGaGfyYXGOlVxkgtbJ1CYrHlqy2Z5DU WpGw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20230601; t=1700123567; x=1700728367; h=cc:to:from:subject:message-id:mime-version:date:x-gm-message-state :from:to:cc:subject:date:message-id:reply-to; bh=31bn3B5X8I0gch6WfMuHeSex2F8MyGxZRscHzn524C8=; b=OKWqunlPtvXRKXpU9v5a/eyNYtP+I5wzdBXeBiR2TaCQX/21w90xT3gi8wYcf4jN1W O13t3PBKcdxVtPdZoR6loMCWEknd3Z4QhP0ByDwS6som0+6z4hcROmKI5SV5N3xItIfA V4i6uJ9m+2CteDiKHnoXilQVgkMn6IPQx1MS+TyOWoMPL6ToBrLMHc+awT0IakwJf6wg P/W/v+1sHxm69Nj7EcLgnSWyzletaKVHW19RW4jY4Q38TjrKBkCaTcVxzvoOuhSvGjoy mBxT9+p/KWRgEnYAepB4MqBuX9dn6A7pmMP4w6EIISnY1OFnRi8hfLY/n3Gt2cF0ge1f MpeA== X-Gm-Message-State: AOJu0YziaiEjT6iAB82jgSTZ2CeJNHzOglkvb78bLBu8WmgeJuE501l+ nCFuK9S4EvE3vlXyYE/rDhDY4tZFObGXWcY= X-Google-Smtp-Source: AGHT+IGF3a0V8XXgRSu/fRueRhaUTO2mo/G8zpcGV7+ayUWSjR7I8sWOE7UrZNwXXcnavubN3aWnRnTKC0SSOOg= X-Received: from guanyulin-p620linsp01.ntc.corp.google.com ([2401:fa00:fc:202:86b7:16db:b4e1:f67a]) (user=guanyulin job=sendgmr) by 2002:a17:90b:2d8c:b0:280:32d5:8904 with SMTP id sj12-20020a17090b2d8c00b0028032d58904mr287071pjb.1.1700123567158; Thu, 16 Nov 2023 00:32:47 -0800 (PST) Date: Thu, 16 Nov 2023 16:32:16 +0800 Precedence: bulk X-Mailing-List: linux-usb@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: Mime-Version: 1.0 X-Mailer: git-send-email 2.43.0.rc0.421.g78406f8d94-goog Message-ID: <20231116083221.1201892-1-guanyulin@google.com> Subject: [PATCH] usb: typec: tcpm: skip checking port->send_discover in PD3.0 From: Guan-Yu Lin To: linux@roeck-us.net, heikki.krogerus@linux.intel.com, gregkh@linuxfoundation.org Cc: linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org, badhri@google.com, kyletso@google.com, albertccwang@google.com, Guan-Yu Lin The original Collison Avoidance mechanism, port->send_discover, avoids the conflict when port partners start AMS almost the same time. However, this mechanism is replaced by SINK_TX_OK and SINK_TX_NG. Skip the check in PD3.0 to avoid the deadlock when source is requesting DR_SWAP where sink is requesting DISCOVER_IDENTITY. Signed-off-by: Guan-Yu Lin Reviewed-by: Heikki Krogerus Reviewed-by: Guenter Roeck --- drivers/usb/typec/tcpm/tcpm.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/usb/typec/tcpm/tcpm.c b/drivers/usb/typec/tcpm/tcpm.c index 058d5b853b57..ff3c171a3a75 100644 --- a/drivers/usb/typec/tcpm/tcpm.c +++ b/drivers/usb/typec/tcpm/tcpm.c @@ -2847,7 +2847,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS); } else { - if (port->send_discover) { + if (port->send_discover && port->negotiated_rev < PD_REV30) { tcpm_queue_message(port, PD_MSG_CTRL_WAIT); break; } @@ -2863,7 +2863,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port, PD_MSG_CTRL_NOT_SUPP, NONE_AMS); } else { - if (port->send_discover) { + if (port->send_discover && port->negotiated_rev < PD_REV30) { tcpm_queue_message(port, PD_MSG_CTRL_WAIT); break; } @@ -2872,7 +2872,7 @@ static void tcpm_pd_ctrl_request(struct tcpm_port *port, } break; case PD_CTRL_VCONN_SWAP: - if (port->send_discover) { + if (port->send_discover && port->negotiated_rev < PD_REV30) { tcpm_queue_message(port, PD_MSG_CTRL_WAIT); break; }