From patchwork Thu May 20 09:18:28 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg Kroah-Hartman X-Patchwork-Id: 445615 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-19.1 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 993E6C43461 for ; Thu, 20 May 2021 10:15:56 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 858256144C for ; Thu, 20 May 2021 10:15:56 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S235806AbhETKRQ (ORCPT ); Thu, 20 May 2021 06:17:16 -0400 Received: from mail.kernel.org ([198.145.29.99]:47610 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236457AbhETKPP (ORCPT ); Thu, 20 May 2021 06:15:15 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 45C026144C; Thu, 20 May 2021 09:45:25 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1621503925; bh=vCT2FZxYGz6jX4L/YmUYhSIqnBDOKlI9g8OwjoUGcJw=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=lQw16LRmYpLgofUU8ml3p3iaWIeRHmlRkgNZOrF2FTUwh/sGQcM9nrsRnUub9EUnn oGEfv3cvgICci2QKwkMl1GqcbVZ2AMQF+qQQ8pNLWBP0ZbThAchgkVfd+FNTtVKjgi sh0leGuQoRUzYFBu/suWVk36QBDk7kJu7t5iLQ2M= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Mark Pearson , Hans de Goede Subject: [PATCH 4.14 016/323] platform/x86: thinkpad_acpi: Correct thermal sensor allocation Date: Thu, 20 May 2021 11:18:28 +0200 Message-Id: <20210520092120.666747440@linuxfoundation.org> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20210520092120.115153432@linuxfoundation.org> References: <20210520092120.115153432@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Mark Pearson commit 6759e18e5cd8745a5dfc5726e4a3db5281ec1639 upstream. On recent Thinkpad platforms it was reported that temp sensor 11 was always incorrectly displaying 66C. It turns out the reason for this is that this location in EC RAM is not a temperature sensor but is the power supply ID (offset 0xC2). Based on feedback from the Lenovo firmware team the EC RAM version can be determined and for the current version (3) only the 0x78 to 0x7F range is used for temp sensors. I don't have any details for earlier versions so I have left the implementation unaltered there. Note - in this block only 0x78 and 0x79 are officially designated (CPU & GPU sensors). The use of the other locations in the block will vary from platform to platform; but the existing logic to detect a sensor presence holds. Signed-off-by: Mark Pearson Link: https://lore.kernel.org/r/20210407212015.298222-1-markpearson@lenovo.com Reviewed-by: Hans de Goede Signed-off-by: Hans de Goede Signed-off-by: Greg Kroah-Hartman --- drivers/platform/x86/thinkpad_acpi.c | 31 ++++++++++++++++++++++--------- 1 file changed, 22 insertions(+), 9 deletions(-) --- a/drivers/platform/x86/thinkpad_acpi.c +++ b/drivers/platform/x86/thinkpad_acpi.c @@ -6162,6 +6162,7 @@ enum thermal_access_mode { enum { /* TPACPI_THERMAL_TPEC_* */ TP_EC_THERMAL_TMP0 = 0x78, /* ACPI EC regs TMP 0..7 */ TP_EC_THERMAL_TMP8 = 0xC0, /* ACPI EC regs TMP 8..15 */ + TP_EC_FUNCREV = 0xEF, /* ACPI EC Functional revision */ TP_EC_THERMAL_TMP_NA = -128, /* ACPI EC sensor not available */ TPACPI_THERMAL_SENSOR_NA = -128000, /* Sensor not available */ @@ -6360,7 +6361,7 @@ static const struct attribute_group ther static int __init thermal_init(struct ibm_init_struct *iibm) { - u8 t, ta1, ta2; + u8 t, ta1, ta2, ver = 0; int i; int acpi_tmp7; int res; @@ -6375,7 +6376,14 @@ static int __init thermal_init(struct ib * 0x78-0x7F, 0xC0-0xC7. Registers return 0x00 for * non-implemented, thermal sensors return 0x80 when * not available + * The above rule is unfortunately flawed. This has been seen with + * 0xC2 (power supply ID) causing thermal control problems. + * The EC version can be determined by offset 0xEF and at least for + * version 3 the Lenovo firmware team confirmed that registers 0xC0-0xC7 + * are not thermal registers. */ + if (!acpi_ec_read(TP_EC_FUNCREV, &ver)) + pr_warn("Thinkpad ACPI EC unable to access EC version\n"); ta1 = ta2 = 0; for (i = 0; i < 8; i++) { @@ -6385,11 +6393,13 @@ static int __init thermal_init(struct ib ta1 = 0; break; } - if (acpi_ec_read(TP_EC_THERMAL_TMP8 + i, &t)) { - ta2 |= t; - } else { - ta1 = 0; - break; + if (ver < 3) { + if (acpi_ec_read(TP_EC_THERMAL_TMP8 + i, &t)) { + ta2 |= t; + } else { + ta1 = 0; + break; + } } } if (ta1 == 0) { @@ -6402,9 +6412,12 @@ static int __init thermal_init(struct ib thermal_read_mode = TPACPI_THERMAL_NONE; } } else { - thermal_read_mode = - (ta2 != 0) ? - TPACPI_THERMAL_TPEC_16 : TPACPI_THERMAL_TPEC_8; + if (ver >= 3) + thermal_read_mode = TPACPI_THERMAL_TPEC_8; + else + thermal_read_mode = + (ta2 != 0) ? + TPACPI_THERMAL_TPEC_16 : TPACPI_THERMAL_TPEC_8; } } else if (acpi_tmp7) { if (tpacpi_is_ibm() &&