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 X-Spam-Level: X-Spam-Status: No, score=-8.6 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_SANE_2 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 7E82FCA9EAF for ; Mon, 21 Oct 2019 16:42:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 50FCC206C2 for ; Mon, 21 Oct 2019 16:42:50 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571676170; bh=8srR2iv2Jx5/DQEobogfVbMkbZT9v5jyBlATknotPU0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:List-ID:From; b=Fek0qMx+vK411hIaiV634vFO/jWYhnf92RQNamhbUiH4PyIA7I+XH+/lG+oSy8I8O t5pBGSX78WTPxP+4Aor/C+Y8wJBzVE0oVycEeMaH/irLlSoo4/B0ea55mVOCe2tmVF TYhqqlxt3oKnOVdDbBb6Ow3giXFD83JKNAnoxcg0= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726672AbfJUQmt (ORCPT ); Mon, 21 Oct 2019 12:42:49 -0400 Received: from mail.kernel.org ([198.145.29.99]:44816 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1726289AbfJUQmt (ORCPT ); Mon, 21 Oct 2019 12:42:49 -0400 Received: from archlinux (cpc149474-cmbg20-2-0-cust94.5-4.cable.virginm.net [82.4.196.95]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 753A920659; Mon, 21 Oct 2019 16:42:46 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1571676168; bh=8srR2iv2Jx5/DQEobogfVbMkbZT9v5jyBlATknotPU0=; h=Date:From:To:Cc:Subject:In-Reply-To:References:From; b=fNWkeapk6BhvpZXXWBLIrC1UlsorM5zAUYE/tRsn3LKQnWSsn5rYLt9IWw9b4sYrI 8t4U6jL/6qPpZR/l+pUy5l1TD/RAxUG51X0wwHOFuSXatg82rGRWI0DGH0/2zHV8Yh sFfLCpjV2v2APF61+5TjnOvcl8dK1Ilwb4f9XhYw= Date: Mon, 21 Oct 2019 17:42:43 +0100 From: Jonathan Cameron To: Gwendal Grignou Cc: briannorris@chromium.org, knaack.h@gmx.de, lars@metafoo.de, pmeerw@pmeerw.net, lee.jones@linaro.org, bleung@chromium.org, enric.balletbo@collabora.com, dianders@chromium.org, groeck@chromium.org, fabien.lahoudere@collabora.com, linux-kernel@vger.kernel.org, linux-iio@vger.kernel.org Subject: Re: [PATCH v2 17/18] iio: cros_ec: Report hwfifo_watermark_max Message-ID: <20191021174243.35160ae8@archlinux> In-Reply-To: <20191021055403.67849-18-gwendal@chromium.org> References: <20191021055403.67849-1-gwendal@chromium.org> <20191021055403.67849-18-gwendal@chromium.org> X-Mailer: Claws Mail 3.17.4 (GTK+ 2.24.32; x86_64-pc-linux-gnu) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Content-Transfer-Encoding: 7bit Sender: linux-iio-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org On Sun, 20 Oct 2019 22:54:02 -0700 Gwendal Grignou wrote: > Report the maximum amount of sample the EC can hold. > This is not tunable, but can be useful for application to find out the > maximum amount of time it can sleep when hwfifo_timeout is set to a > large number. > > Signed-off-by: Gwendal Grignou Acked-by: Jonathan Cameron > --- > Changes in v2: > - Remove double lines, add line before return for visibility. > > .../cros_ec_sensors/cros_ec_sensors_core.c | 34 +++++++++++++++++-- > .../linux/iio/common/cros_ec_sensors_core.h | 3 ++ > 2 files changed, 35 insertions(+), 2 deletions(-) > > diff --git a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c > index 92128c67a166e..f50e239f9a1e9 100644 > --- a/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c > +++ b/drivers/iio/common/cros_ec_sensors/cros_ec_sensors_core.c > @@ -23,6 +23,12 @@ > #include > #include > > +/* > + * Hard coded to the first device to support sensor fifo. The EC has a 2048 > + * byte fifo and will trigger an interrupt when fifo is 2/3 full. > + */ > +#define CROS_EC_FIFO_SIZE (2048 * 2 / 3) > + > static char *cros_ec_loc[] = { > [MOTIONSENSE_LOC_BASE] = "base", > [MOTIONSENSE_LOC_LID] = "lid", > @@ -56,8 +62,15 @@ static int cros_ec_get_host_cmd_version_mask(struct cros_ec_device *ec_dev, > > static void get_default_min_max_freq(enum motionsensor_type type, > u32 *min_freq, > - u32 *max_freq) > + u32 *max_freq, > + u32 *max_fifo_events) > { > + /* > + * We don't know fifo size, set to size previously used by older > + * hardware. > + */ > + *max_fifo_events = CROS_EC_FIFO_SIZE; > + > switch (type) { > case MOTIONSENSE_TYPE_ACCEL: > case MOTIONSENSE_TYPE_GYRO: > @@ -150,8 +163,22 @@ static IIO_DEVICE_ATTR(hwfifo_timeout, 0644, > cros_ec_sensor_get_report_latency, > cros_ec_sensor_set_report_latency, 0); > > +static ssize_t hwfifo_watermark_max_show( > + struct device *dev, > + struct device_attribute *attr, > + char *buf) > +{ > + struct iio_dev *indio_dev = dev_to_iio_dev(dev); > + struct cros_ec_sensors_core_state *st = iio_priv(indio_dev); > + > + return sprintf(buf, "%d\n", st->fifo_max_event_count); > +} > + > +static IIO_DEVICE_ATTR_RO(hwfifo_watermark_max, 0); > + > const struct attribute *cros_ec_sensor_fifo_attributes[] = { > &iio_dev_attr_hwfifo_timeout.dev_attr.attr, > + &iio_dev_attr_hwfifo_watermark_max.dev_attr.attr, > NULL, > }; > EXPORT_SYMBOL_GPL(cros_ec_sensor_fifo_attributes); > @@ -281,12 +308,15 @@ int cros_ec_sensors_core_init(struct platform_device *pdev, > if (state->msg->version < 3) { > get_default_min_max_freq(state->resp->info.type, > &state->frequencies[1], > - &state->frequencies[2]); > + &state->frequencies[2], > + &state->fifo_max_event_count); > } else { > state->frequencies[1] = > state->resp->info_3.min_frequency; > state->frequencies[2] = > state->resp->info_3.max_frequency; > + state->fifo_max_event_count = > + state->resp->info_3.fifo_max_event_count; > } > > ret = devm_iio_triggered_buffer_setup( > diff --git a/include/linux/iio/common/cros_ec_sensors_core.h b/include/linux/iio/common/cros_ec_sensors_core.h > index 387ca9e61dac8..4df3abd151fbf 100644 > --- a/include/linux/iio/common/cros_ec_sensors_core.h > +++ b/include/linux/iio/common/cros_ec_sensors_core.h > @@ -51,6 +51,7 @@ typedef irqreturn_t (*cros_ec_sensors_capture_t)(int irq, void *p); > * the timestamp. The timestamp is always last and > * is always 8-byte aligned. > * @read_ec_sensors_data: function used for accessing sensors values > + * @fifo_max_event_count: Size of the EC sensor FIFO > */ > struct cros_ec_sensors_core_state { > struct cros_ec_device *ec; > @@ -73,6 +74,8 @@ struct cros_ec_sensors_core_state { > int (*read_ec_sensors_data)(struct iio_dev *indio_dev, > unsigned long scan_mask, s16 *data); > > + u32 fifo_max_event_count; > + > /* Table of known available frequencies : 0, Min and Max in mHz */ > int frequencies[3]; > };