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 43EF0C4332F for ; Sat, 5 Nov 2022 10:33:09 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229632AbiKEKdI (ORCPT ); Sat, 5 Nov 2022 06:33:08 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42364 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229453AbiKEKdH (ORCPT ); Sat, 5 Nov 2022 06:33:07 -0400 Received: from ams.source.kernel.org (ams.source.kernel.org [IPv6:2604:1380:4601:e00::1]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 213D41AD8A for ; Sat, 5 Nov 2022 03:33:07 -0700 (PDT) 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 C132CB8165F for ; Sat, 5 Nov 2022 10:33:05 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 1199FC433C1; Sat, 5 Nov 2022 10:33:03 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1667644384; bh=H36nMjBiWMcQe2MxmY03Jan1YctHvo/uhSSy/pgtX9s=; h=Subject:To:From:Date:From; b=GqUJkTCb0qYQMc3gzbDSRkxnSdE8m/Goik6nWFeHZ1mgwSKeP7oHKw9yJpvfjfB5B H4p74IAuu/WjvNsEEiyb10J6oWYmWmzdlNEnH6Bn6dfSFssjt4NUh07fq/jF6owsHa M98orq/XVel/3IwBO9IhBaKM8WwC/ZJZjSJu22u4= Subject: patch "iio: accel: bma400: Ensure VDDIO is enable defore reading the chip" added to char-misc-linus To: Jonathan.Cameron@huawei.com, Stable@vger.kernel.org, dan@dlrobertson.com From: Date: Sat, 05 Nov 2022 11:32:59 +0100 Message-ID: <1667644379235145@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: accel: bma400: Ensure VDDIO is enable defore reading the chip 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 57572cacd36e6d4be7722d7770d23f4430219827 Mon Sep 17 00:00:00 2001 From: Jonathan Cameron Date: Sun, 2 Oct 2022 15:41:33 +0100 Subject: iio: accel: bma400: Ensure VDDIO is enable defore reading the chip ID. The regulator enables were after the check on the chip variant, which was very unlikely to return a correct value when not powered. Presumably all the device anyone is testing on have a regulator that is already powered up when this code runs for reasons beyond the scope of this driver. Move the read call down a few lines. Fixes: 3cf7ded15e40 ("iio: accel: bma400: basic regulator support") Signed-off-by: Jonathan Cameron Reviewed-by: Dan Robertson Cc: Link: https://lore.kernel.org/r/20221002144133.3771029-1-jic23@kernel.org --- drivers/iio/accel/bma400_core.c | 24 ++++++++++++------------ 1 file changed, 12 insertions(+), 12 deletions(-) diff --git a/drivers/iio/accel/bma400_core.c b/drivers/iio/accel/bma400_core.c index ad8fce3e08cd..490c342ef72a 100644 --- a/drivers/iio/accel/bma400_core.c +++ b/drivers/iio/accel/bma400_core.c @@ -869,18 +869,6 @@ static int bma400_init(struct bma400_data *data) unsigned int val; int ret; - /* Try to read chip_id register. It must return 0x90. */ - ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val); - if (ret) { - dev_err(data->dev, "Failed to read chip id register\n"); - return ret; - } - - if (val != BMA400_ID_REG_VAL) { - dev_err(data->dev, "Chip ID mismatch\n"); - return -ENODEV; - } - data->regulators[BMA400_VDD_REGULATOR].supply = "vdd"; data->regulators[BMA400_VDDIO_REGULATOR].supply = "vddio"; ret = devm_regulator_bulk_get(data->dev, @@ -906,6 +894,18 @@ static int bma400_init(struct bma400_data *data) if (ret) return ret; + /* Try to read chip_id register. It must return 0x90. */ + ret = regmap_read(data->regmap, BMA400_CHIP_ID_REG, &val); + if (ret) { + dev_err(data->dev, "Failed to read chip id register\n"); + return ret; + } + + if (val != BMA400_ID_REG_VAL) { + dev_err(data->dev, "Chip ID mismatch\n"); + return -ENODEV; + } + ret = bma400_get_power_mode(data); if (ret) { dev_err(data->dev, "Failed to get the initial power-mode\n"); -- 2.38.1