From patchwork Tue Feb 1 13:07:06 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hans de Goede X-Patchwork-Id: 539032 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 3373DC4332F for ; Tue, 1 Feb 2022 13:09:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S238924AbiBANJl (ORCPT ); Tue, 1 Feb 2022 08:09:41 -0500 Received: from us-smtp-delivery-124.mimecast.com ([170.10.133.124]:22926 "EHLO us-smtp-delivery-124.mimecast.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S238773AbiBANI7 (ORCPT ); Tue, 1 Feb 2022 08:08:59 -0500 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=redhat.com; s=mimecast20190719; t=1643720938; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding: in-reply-to:in-reply-to:references:references; bh=0k8qmopVRDS/Fv3iqd9Jcw5dP0WQfGSVwqFKczDcaqk=; b=NLsm9yUoARv4hd1LRV+JRsX1XPe479DfAed8Zvq0HXfdczzZgYQDUEB5sSgYo5oxQ3zm0W kl/7PqMsKYmtBVCIuy6HDNkxak9TY1hKwyRV8jxcS4mDkTOdtpqbHyaLA63bG7H5PJ0URG 49bfZR/jm+vVW0CR5RlD/mX1lr08qFY= Received: from mimecast-mx01.redhat.com (mimecast-mx01.redhat.com [209.132.183.4]) by relay.mimecast.com with ESMTP with STARTTLS (version=TLSv1.2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id us-mta-184-1BtNRsGmMqG8mJwKJwvbGQ-1; Tue, 01 Feb 2022 08:08:55 -0500 X-MC-Unique: 1BtNRsGmMqG8mJwKJwvbGQ-1 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mimecast-mx01.redhat.com (Postfix) with ESMTPS id 280B31B2C984; Tue, 1 Feb 2022 13:08:53 +0000 (UTC) Received: from shalem.redhat.com (unknown [10.39.194.196]) by smtp.corp.redhat.com (Postfix) with ESMTP id B80DB795B1; Tue, 1 Feb 2022 13:08:49 +0000 (UTC) From: Hans de Goede To: "Rafael J . Wysocki" , Mika Westerberg , Mark Gross , Andy Shevchenko , Wolfram Sang , Lee Jones , Sebastian Reichel , MyungJoo Ham , Chanwoo Choi , Ard Biesheuvel Cc: Hans de Goede , Len Brown , linux-acpi@vger.kernel.org, Yauhen Kharuzhy , Tsuchiya Yuto , Fabio Aiuto , platform-driver-x86@vger.kernel.org, linux-pm@vger.kernel.org, linux-kernel@vger.kernel.org, linux-efi@vger.kernel.org Subject: [PATCH v5 20/20] extcon: intel-cht-wc: Report RID_A for ACA adapters Date: Tue, 1 Feb 2022 14:07:06 +0100 Message-Id: <20220201130706.46685-21-hdegoede@redhat.com> In-Reply-To: <20220201130706.46685-1-hdegoede@redhat.com> References: <20220201130706.46685-1-hdegoede@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 Precedence: bulk List-ID: X-Mailing-List: linux-acpi@vger.kernel.org Make cht_wc_extcon_get_id() report RID_A for ACA adapters, instead of reporting ID_FLOAT. According to the spec. we should read the USB-ID pin ADC value to determine the resistance of the used pull-down resister and then return RID_A / RID_B / RID_C based on this. But all "Accessory Charger Adapter"s (ACAs) which users can actually buy always use a combination of a charging port with one or more USB-A ports, so they should always use a resistor indicating RID_A. But the spec is hard to read / badly-worded so some of them actually indicate they are a RID_B ACA even though they clearly are a RID_A ACA. To workaround this simply always return INTEL_USB_RID_A, which matches all the ACAs which users can actually buy. Acked-by: Chanwoo Choi Signed-off-by: Hans de Goede --- drivers/extcon/extcon-intel-cht-wc.c | 18 +++++++++++++----- 1 file changed, 13 insertions(+), 5 deletions(-) diff --git a/drivers/extcon/extcon-intel-cht-wc.c b/drivers/extcon/extcon-intel-cht-wc.c index cf74acb92fe3..89a6449e3f4a 100644 --- a/drivers/extcon/extcon-intel-cht-wc.c +++ b/drivers/extcon/extcon-intel-cht-wc.c @@ -121,13 +121,21 @@ static int cht_wc_extcon_get_id(struct cht_wc_extcon_data *ext, int pwrsrc_sts) return INTEL_USB_ID_GND; case CHT_WC_PWRSRC_RID_FLOAT: return INTEL_USB_ID_FLOAT; + /* + * According to the spec. we should read the USB-ID pin ADC value here + * to determine the resistance of the used pull-down resister and then + * return RID_A / RID_B / RID_C based on this. But all "Accessory + * Charger Adapter"s (ACAs) which users can actually buy always use + * a combination of a charging port with one or more USB-A ports, so + * they should always use a resistor indicating RID_A. But the spec + * is hard to read / badly-worded so some of them actually indicate + * they are a RID_B ACA evnen though they clearly are a RID_A ACA. + * To workaround this simply always return INTEL_USB_RID_A, which + * matches all the ACAs which users can actually buy. + */ case CHT_WC_PWRSRC_RID_ACA: + return INTEL_USB_RID_A; default: - /* - * Once we have IIO support for the GPADC we should read - * the USBID GPADC channel here and determine ACA role - * based on that. - */ return INTEL_USB_ID_FLOAT; } }