From mboxrd@z Thu Jan 1 00:00:00 1970 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 3DFB1C433EF for ; Wed, 8 Dec 2021 12:54:10 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S233807AbhLHM5l (ORCPT ); Wed, 8 Dec 2021 07:57:41 -0500 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:47168 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233796AbhLHM5l (ORCPT ); Wed, 8 Dec 2021 07:57:41 -0500 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 1F95BC061746 for ; Wed, 8 Dec 2021 04:54:09 -0800 (PST) Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by ams.source.kernel.org (Postfix) with ESMTPS id DE391B81F7E for ; Wed, 8 Dec 2021 12:54:07 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 17C55C00446; Wed, 8 Dec 2021 12:54:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1638968046; bh=4oKwn1DBqQyNlyzHlkivVAw6MoyWpBm8e6F62/ZoyEc=; h=Subject:To:From:Date:From; b=JsZkM27rD0JBrOW1ikaaqIIUlFoPyTzTtAqcVu94AFvmoS/vpGuxKo27zQDk5GGab 9YLSq40VHtSiTsV1q0bC/BdRp7RjcJjTME2BTmFGrSHqe+qxHhbd/P0TmjxGTgGDwV iji5kSSJEmFXcoewj3HmgTotpso1r5bGMpQjkKY8= Subject: patch "iio: adc: stm32: fix a current leak by resetting pcsel before" added to char-misc-linus To: fabrice.gasnier@foss.st.com, Jonathan.Cameron@huawei.com, Stable@vger.kernel.org, olivier.moysan@foss.st.com From: Date: Wed, 08 Dec 2021 13:53:53 +0100 Message-ID: <16389680334820@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org This is a note to let you know that I've just added the patch titled iio: adc: stm32: fix a current leak by resetting pcsel before to my char-misc git tree which can be found at git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc.git in the char-misc-linus branch. The patch will show up in the next release of the linux-next tree (usually sometime within the next 24 hours during the week.) The patch will hopefully also be merged in Linus's tree for the next -rc kernel release. If you have any questions about this process, please let me know. >From f711f28e71e965c0d1141c830fa7131b41abbe75 Mon Sep 17 00:00:00 2001 From: Fabrice Gasnier Date: Fri, 22 Oct 2021 14:19:29 +0200 Subject: iio: adc: stm32: fix a current leak by resetting pcsel before disabling vdda Some I/Os are connected to ADC input channels, when the corresponding bit in PCSEL register are set on STM32H7 and STM32MP15. This is done in the prepare routine of stm32-adc driver. There are constraints here, as PCSEL shouldn't be set when VDDA supply is disabled. Enabling/disabling of VDDA supply in done via stm32-adc-core runtime PM routines (before/after ADC is enabled/disabled). Currently, PCSEL remains set when disabling ADC. Later on, PM runtime can disable the VDDA supply. This creates some conditions on I/Os that can start to leak current. So PCSEL needs to be cleared when disabling the ADC. Fixes: 95e339b6e85d ("iio: adc: stm32: add support for STM32H7") Signed-off-by: Fabrice Gasnier Reviewed-by: Olivier Moysan Link: https://lore.kernel.org/r/1634905169-23762-1-git-send-email-fabrice.gasnier@foss.st.com Cc: Signed-off-by: Jonathan Cameron --- drivers/iio/adc/stm32-adc.c | 1 + 1 file changed, 1 insertion(+) diff --git a/drivers/iio/adc/stm32-adc.c b/drivers/iio/adc/stm32-adc.c index 6245434f8377..60f2ccf7e342 100644 --- a/drivers/iio/adc/stm32-adc.c +++ b/drivers/iio/adc/stm32-adc.c @@ -1117,6 +1117,7 @@ static void stm32h7_adc_unprepare(struct iio_dev *indio_dev) { struct stm32_adc *adc = iio_priv(indio_dev); + stm32_adc_writel(adc, STM32H7_ADC_PCSEL, 0); stm32h7_adc_disable(indio_dev); stm32_adc_int_ch_disable(adc); stm32h7_adc_enter_pwr_down(adc); -- 2.34.1