From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id DE049186E40; Tue, 26 Aug 2025 13:14:32 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756214073; cv=none; b=Y/VRiGkch8AdpJ1uClrKleeMb5zj843PR05lma/ZfYPHyeiDZtzdGA8teLqNOuBEldn+OQDTEbjZR4zwepTiCFAFRIemTjyakxRnOH14mRr2Zchni4gOGcHmw0mS9MVGMh+1+C9DJNdcnxXcsyDCsVXABGKEj08WBsrf/VPLKF8= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1756214073; c=relaxed/simple; bh=53QjcfJoVj0jE8EzvIUJcE5hF6avBdqNGbpygTwFcTo=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=avbBOmluTVrz0yST/H0vgWZ/8dL2Jz4LLrDlt0Gkf03d/bGnkCKfd0xsVRKQq0juoEnMQiMpWLzQTaEFkodBxju4MbUE7KKEpH+8018LRBh6qcCZOk5ZDlPuU82R6w+qOcksHROnP8E6TSq3/PYw28zkbb4DV9ZUo9UF5gr8n9U= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=zHLQuk8c; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="zHLQuk8c" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 707CAC4CEF1; Tue, 26 Aug 2025 13:14:32 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1756214072; bh=53QjcfJoVj0jE8EzvIUJcE5hF6avBdqNGbpygTwFcTo=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=zHLQuk8cmkekZpuADEJJm3smIK3TnFUSyiTIEDIY01GO/MVUD3FJ4h2rU+vyIAnxV 1cHoNAg2XcEBnYYHI8c+DVTWcAtKbMX54O5E4m3zuWL0an/6BvWi7qKePrIcWxkUH3 2SFgj2MgoIlXv/4W7G/YgBmn3RY+N5vyuxcnk738= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, stable , Amit Sunil Dhamne , Badhri Jagan Sridharan , Sasha Levin Subject: [PATCH 6.6 545/587] usb: typec: maxim_contaminant: re-enable cc toggle if cc is open and port is clean Date: Tue, 26 Aug 2025 13:11:34 +0200 Message-ID: <20250826111006.882532061@linuxfoundation.org> X-Mailer: git-send-email 2.50.1 In-Reply-To: <20250826110952.942403671@linuxfoundation.org> References: <20250826110952.942403671@linuxfoundation.org> User-Agent: quilt/0.68 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.6-stable review patch. If anyone has any objections, please let me know. ------------------ From: Amit Sunil Dhamne [ Upstream commit a381c6d6f646226924809d0ad01a9465786da463 ] Presently in `max_contaminant_is_contaminant()` if there's no contaminant detected previously, CC is open & stopped toggling and no contaminant is currently present, TCPC.RC would be programmed to do DRP toggling. However, it didn't actively look for a connection. This would lead to Type-C not detect *any* new connections. Hence, in the above situation, re-enable toggling & program TCPC to look for a new connection. Also, return early if TCPC was looking for connection as this indicates TCPC has neither detected a potential connection nor a change in contaminant state. In addition, once dry detection is complete (port is dry), restart toggling. Fixes: 02b332a06397e ("usb: typec: maxim_contaminant: Implement check_contaminant callback") Cc: stable Signed-off-by: Amit Sunil Dhamne Reviewed-by: Badhri Jagan Sridharan Link: https://lore.kernel.org/r/20250815-fix-upstream-contaminant-v2-2-6c8d6c3adafb@google.com Signed-off-by: Greg Kroah-Hartman Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/usb/typec/tcpm/maxim_contaminant.c | 48 +++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) --- a/drivers/usb/typec/tcpm/maxim_contaminant.c +++ b/drivers/usb/typec/tcpm/maxim_contaminant.c @@ -322,6 +322,34 @@ static int max_contaminant_enable_dry_de return 0; } +static int max_contaminant_enable_toggling(struct max_tcpci_chip *chip) +{ + struct regmap *regmap = chip->data.regmap; + int ret; + + /* Disable dry detection if enabled. */ + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL2, CCLPMODESEL_MASK, + ULTRA_LOW_POWER_MODE); + if (ret) + return ret; + + ret = regmap_update_bits(regmap, TCPC_VENDOR_CC_CTRL1, CCCONNDRY, 0); + if (ret) + return ret; + + ret = max_tcpci_write8(chip, TCPC_ROLE_CTRL, TCPC_ROLE_CTRL_DRP | 0xA); + if (ret) + return ret; + + ret = regmap_update_bits(regmap, TCPC_TCPC_CTRL, + TCPC_TCPC_CTRL_EN_LK4CONN_ALRT, + TCPC_TCPC_CTRL_EN_LK4CONN_ALRT); + if (ret) + return ret; + + return max_tcpci_write8(chip, TCPC_COMMAND, TCPC_CMD_LOOK4CONNECTION); +} + bool max_contaminant_is_contaminant(struct max_tcpci_chip *chip, bool disconnect_while_debounce) { u8 cc_status, pwr_cntl; @@ -335,6 +363,12 @@ bool max_contaminant_is_contaminant(stru if (ret < 0) return false; + if (cc_status & TCPC_CC_STATUS_TOGGLING) { + if (chip->contaminant_state == DETECTED) + return true; + return false; + } + if (chip->contaminant_state == NOT_DETECTED || chip->contaminant_state == SINK) { if (!disconnect_while_debounce) msleep(100); @@ -367,6 +401,12 @@ bool max_contaminant_is_contaminant(stru max_contaminant_enable_dry_detection(chip); return true; } + + ret = max_contaminant_enable_toggling(chip); + if (ret) + dev_err(chip->dev, + "Failed to enable toggling, ret=%d", + ret); } return false; } else if (chip->contaminant_state == DETECTED) { @@ -375,6 +415,14 @@ bool max_contaminant_is_contaminant(stru if (chip->contaminant_state == DETECTED) { max_contaminant_enable_dry_detection(chip); return true; + } else { + ret = max_contaminant_enable_toggling(chip); + if (ret) { + dev_err(chip->dev, + "Failed to enable toggling, ret=%d", + ret); + return true; + } } } }