From patchwork Fri Jan 15 12:27:50 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Greg KH X-Patchwork-Id: 364654 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=-18.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_CR_TRAILER, INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, 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 B23B8C43331 for ; Fri, 15 Jan 2021 12:31:40 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 7BF39235F8 for ; Fri, 15 Jan 2021 12:31:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1732666AbhAOMbc (ORCPT ); Fri, 15 Jan 2021 07:31:32 -0500 Received: from mail.kernel.org ([198.145.29.99]:36412 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1732655AbhAOMbb (ORCPT ); Fri, 15 Jan 2021 07:31:31 -0500 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7BAC5235F8; Fri, 15 Jan 2021 12:31:05 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1610713865; bh=T1ZqFLYYqF004QD5vkX34Vl9/pY2PW6cv416TriwQYE=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=OohF+Zi0Doik54S5g6McjVXzYgDoo3CL9tJo2JYbRHig/51c7dEZ1+Su/1Yqc4ftG jH5redHnmirMf6J+7/VdASU3FmzwLLndiWXrzL2q7AI4hqCUJ5v60gb+/60MMS9Bw7 RTs/dXYCkePbpZLu5wbZxlx7T3+xua2Opk4oxH5k= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Lorenzo Bianconi , Stable@vger.kernel.org, Jonathan Cameron , Sudip Mukherjee Subject: [PATCH 4.14 13/28] iio: imu: st_lsm6dsx: fix edge-trigger interrupts Date: Fri, 15 Jan 2021 13:27:50 +0100 Message-Id: <20210115121957.413861346@linuxfoundation.org> X-Mailer: git-send-email 2.30.0 In-Reply-To: <20210115121956.731354372@linuxfoundation.org> References: <20210115121956.731354372@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Lorenzo Bianconi commit 3f9bce7a22a3f8ac9d885c9d75bc45569f24ac8b upstream If we are using edge IRQs, new samples can arrive while processing current interrupt since there are no hw guarantees the irq line stays "low" long enough to properly detect the new interrupt. In this case the new sample will be missed. Polling FIFO status register in st_lsm6dsx_handler_thread routine allow us to read new samples even if the interrupt arrives while processing previous data and the timeslot where the line is "low" is too short to be properly detected. Fixes: 89ca88a7cdf2 ("iio: imu: st_lsm6dsx: support active-low interrupts") Fixes: 290a6ce11d93 ("iio: imu: add support to lsm6dsx driver") Signed-off-by: Lorenzo Bianconi Link: https://lore.kernel.org/r/5e93cda7dc1e665f5685c53ad8e9ea71dbae782d.1605378871.git.lorenzo@kernel.org Cc: Signed-off-by: Jonathan Cameron [sudip: manual backport to old irq handler path] Signed-off-by: Sudip Mukherjee Signed-off-by: Greg Kroah-Hartman --- drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c | 26 ++++++++++++++++++++----- 1 file changed, 21 insertions(+), 5 deletions(-) --- a/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c +++ b/drivers/iio/imu/st_lsm6dsx/st_lsm6dsx_buffer.c @@ -395,13 +395,29 @@ static irqreturn_t st_lsm6dsx_handler_ir static irqreturn_t st_lsm6dsx_handler_thread(int irq, void *private) { struct st_lsm6dsx_hw *hw = private; - int count; + int fifo_len = 0, len; - mutex_lock(&hw->fifo_lock); - count = st_lsm6dsx_read_fifo(hw); - mutex_unlock(&hw->fifo_lock); + /* + * If we are using edge IRQs, new samples can arrive while + * processing current interrupt since there are no hw + * guarantees the irq line stays "low" long enough to properly + * detect the new interrupt. In this case the new sample will + * be missed. + * Polling FIFO status register allow us to read new + * samples even if the interrupt arrives while processing + * previous data and the timeslot where the line is "low" is + * too short to be properly detected. + */ + do { + mutex_lock(&hw->fifo_lock); + len = st_lsm6dsx_read_fifo(hw); + mutex_unlock(&hw->fifo_lock); - return count ? IRQ_HANDLED : IRQ_NONE; + if (len > 0) + fifo_len += len; + } while (len > 0); + + return fifo_len ? IRQ_HANDLED : IRQ_NONE; } static int st_lsm6dsx_buffer_preenable(struct iio_dev *iio_dev)