From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 72A3543E06B; Tue, 21 Jul 2026 22:25:40 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672741; cv=none; b=b/ULDgy/12+GkRNS/NCy5zLf6/uuvqAmnoPmUyA1Y4Y56miuEtiQy/YVvMSt0X+2af6FWMBdCF8fOpLEISLbJdhjHm2JYaYosMCcLVEpWBWpx6SjHuSHsHhGgEWOgeBvlZvIk0qRxKlOGYGf7jL5xX+W0GnufjioI5zZBXvowIQ= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1784672741; c=relaxed/simple; bh=opAExVKh6IZeid8HKQiZ0kmcRETmQ0NJlJDYPW8NNAQ=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=BbOcpZC4J0FEV2gBhC24NDub8NiNwqmUNX8AvuhVCLZd7B7239GSBmsBN/7+du+UZJD7F4QvupdVas9lXP913C4GjVz/NbFrIl+iFh/PBrUJdsws3Dp6vhpV5Alp01umCB0lh0ZhwaDUZou/O++9CpOXt81LJuzEuokNCV0QMIQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=AyN0HXe6; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="AyN0HXe6" Received: by smtp.kernel.org (Postfix) with ESMTPSA id D81121F000E9; Tue, 21 Jul 2026 22:25:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1784672740; bh=hY5aM2qcUw1dp8zfYElYXBVTQtBJgegJaAUxTgSzaz0=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=AyN0HXe6e4LdjiU57LjW0xXJiPdUnowtCd0YuXC53+aQ32i+ZdH9lVjdi2LAEC0lS BbRsQpXIuSc/2F3ZEbTdSzlqVG4vT5EnHsx05u+kgosrlFeZk7za+CrvAijxoGoolf K0Za6zUKVV6N7jbUMLuhHp0xLig09o7dB0OlO0hU= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jean-Baptiste Maneyrol , Jonathan Cameron , Sasha Levin Subject: [PATCH 5.15 740/843] iio: imu: inv_icm42600: stabilized timestamp in interrupt Date: Tue, 21 Jul 2026 17:26:15 +0200 Message-ID: <20260721152422.694267793@linuxfoundation.org> X-Mailer: git-send-email 2.55.0 In-Reply-To: <20260721152405.946368001@linuxfoundation.org> References: <20260721152405.946368001@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 5.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jean-Baptiste Maneyrol [ Upstream commit d7bd473632d07f8a54655c270c0940cc3671c548 ] Use IRQF_ONESHOT flag to ensure the timestamp is not updated in the hard handler during the thread handler. And compute and use the effective watermark value that correspond to this first timestamp. This way we can ensure the timestamp is always corresponding to the value used by the timestamping mechanism. Otherwise, it is possible that between FIFO count read and FIFO processing the timestamp is overwritten in the hard handler. Fixes: ec74ae9fd37c ("iio: imu: inv_icm42600: add accurate timestamping") Cc: stable@vger.kernel.org Signed-off-by: Jean-Baptiste Maneyrol Link: https://lore.kernel.org/r/20240529154717.651863-1-inv.git-commit@tdk.com Signed-off-by: Jonathan Cameron Stable-dep-of: affe3f077d7a ("iio: imu: inv_icm42600: fix timestamping by limiting FIFO reading") Signed-off-by: Sasha Levin Signed-off-by: Greg Kroah-Hartman --- drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c | 19 +++++++++++++++++-- drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h | 2 ++ drivers/iio/imu/inv_icm42600/inv_icm42600_core.c | 1 + 3 files changed, 20 insertions(+), 2 deletions(-) --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.c @@ -222,10 +222,15 @@ int inv_icm42600_buffer_update_watermark latency_accel = period_accel * wm_accel; /* 0 value for watermark means that the sensor is turned off */ + if (wm_gyro == 0 && wm_accel == 0) + return 0; + if (latency_gyro == 0) { watermark = wm_accel; + st->fifo.watermark.eff_accel = wm_accel; } else if (latency_accel == 0) { watermark = wm_gyro; + st->fifo.watermark.eff_gyro = wm_gyro; } else { /* compute the smallest latency that is a multiple of both */ if (latency_gyro <= latency_accel) @@ -241,6 +246,13 @@ int inv_icm42600_buffer_update_watermark watermark = latency / period; if (watermark < 1) watermark = 1; + /* update effective watermark */ + st->fifo.watermark.eff_gyro = latency / period_gyro; + if (st->fifo.watermark.eff_gyro < 1) + st->fifo.watermark.eff_gyro = 1; + st->fifo.watermark.eff_accel = latency / period_accel; + if (st->fifo.watermark.eff_accel < 1) + st->fifo.watermark.eff_accel = 1; } /* compute watermark value in bytes */ @@ -517,7 +529,7 @@ int inv_icm42600_buffer_fifo_parse(struc /* handle gyroscope timestamp and FIFO data parsing */ if (st->fifo.nb.gyro > 0) { ts = iio_priv(st->indio_gyro); - inv_sensors_timestamp_interrupt(ts, st->fifo.nb.gyro, + inv_sensors_timestamp_interrupt(ts, st->fifo.watermark.eff_gyro, st->timestamp.gyro); ret = inv_icm42600_gyro_parse_fifo(st->indio_gyro); if (ret) @@ -527,7 +539,7 @@ int inv_icm42600_buffer_fifo_parse(struc /* handle accelerometer timestamp and FIFO data parsing */ if (st->fifo.nb.accel > 0) { ts = iio_priv(st->indio_accel); - inv_sensors_timestamp_interrupt(ts, st->fifo.nb.accel, + inv_sensors_timestamp_interrupt(ts, st->fifo.watermark.eff_accel, st->timestamp.accel); ret = inv_icm42600_accel_parse_fifo(st->indio_accel); if (ret) @@ -578,6 +590,9 @@ int inv_icm42600_buffer_init(struct inv_ unsigned int val; int ret; + st->fifo.watermark.eff_gyro = 1; + st->fifo.watermark.eff_accel = 1; + /* * Default FIFO configuration (bits 7 to 5) * - use invalid value --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_buffer.h @@ -32,6 +32,8 @@ struct inv_icm42600_fifo { struct { unsigned int gyro; unsigned int accel; + unsigned int eff_gyro; + unsigned int eff_accel; } watermark; size_t count; struct { --- a/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c +++ b/drivers/iio/imu/inv_icm42600/inv_icm42600_core.c @@ -518,6 +518,7 @@ static int inv_icm42600_irq_init(struct if (ret) return ret; + irq_type |= IRQF_ONESHOT; return devm_request_threaded_irq(dev, irq, inv_icm42600_irq_timestamp, inv_icm42600_irq_handler, irq_type, "inv_icm42600", st);