From patchwork Thu Sep 15 19:57:18 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 12977770 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 729B6C6FA82 for ; Thu, 15 Sep 2022 19:57:42 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229905AbiIOT5k (ORCPT ); Thu, 15 Sep 2022 15:57:40 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229725AbiIOT5j (ORCPT ); Thu, 15 Sep 2022 15:57:39 -0400 Received: from mx0a-001b2d01.pphosted.com (mx0b-001b2d01.pphosted.com [148.163.158.5]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id A184296749; Thu, 15 Sep 2022 12:57:37 -0700 (PDT) Received: from pps.filterd (m0098419.ppops.net [127.0.0.1]) by mx0b-001b2d01.pphosted.com (8.17.1.5/8.17.1.5) with ESMTP id 28FI41Y6006925; Thu, 15 Sep 2022 19:57:24 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=ibm.com; h=from : to : cc : subject : date : message-id : in-reply-to : references : mime-version : content-transfer-encoding; s=pp1; bh=nfbf45Kjbcllcx3LUSgELtxP7iBN5yuoktcGcQhHbV4=; b=JkKsXiFAG2Pc18owmJoSgpraGgNe7sM2OzqzB9WJpzZoVTMpEctcpKTgTL9PcEHtnHix WRWlKIX3LuMMKUCAHG+dO3X5o2p9C9H6HsADgkw08gXmcWUTOdaDSSEPKfOshOiHEl/F xL57DYnGEBoi4plE+n98lYzbdH4lTXSFABKkdMS3Sll8dFi7yyRuGNcRXDx/0oEO3LUF qSg0ftvbOofZi72ShK5gNItrkvrgnXmSl25Gzd8oyebbRdd2QrkRu0HcYfloNVTfsYP9 5EBmp49ToWmJ01F0wz9HuccoS7b5n7KzhJtEcEHnTdp6WeZxnjhSaID38eeu+0BKJr1I HQ== Received: from pps.reinject (localhost [127.0.0.1]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3jm90ku8u9-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Sep 2022 19:57:24 +0000 Received: from m0098419.ppops.net (m0098419.ppops.net [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 28FJjjgJ028418; Thu, 15 Sep 2022 19:57:23 GMT Received: from ppma02wdc.us.ibm.com (aa.5b.37a9.ip4.static.sl-reverse.com [169.55.91.170]) by mx0b-001b2d01.pphosted.com (PPS) with ESMTPS id 3jm90ku8ty-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Sep 2022 19:57:23 +0000 Received: from pps.filterd (ppma02wdc.us.ibm.com [127.0.0.1]) by ppma02wdc.us.ibm.com (8.16.1.2/8.16.1.2) with SMTP id 28FJpD0Q024666; Thu, 15 Sep 2022 19:57:22 GMT Received: from b03cxnp08026.gho.boulder.ibm.com (b03cxnp08026.gho.boulder.ibm.com [9.17.130.18]) by ppma02wdc.us.ibm.com with ESMTP id 3jm91cggku-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Thu, 15 Sep 2022 19:57:22 +0000 Received: from b03ledav006.gho.boulder.ibm.com (b03ledav006.gho.boulder.ibm.com [9.17.130.237]) by b03cxnp08026.gho.boulder.ibm.com (8.14.9/8.14.9/NCO v10.0) with ESMTP id 28FJvNxc10617402 (version=TLSv1/SSLv3 cipher=DHE-RSA-AES256-GCM-SHA384 bits=256 verify=OK); Thu, 15 Sep 2022 19:57:23 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id EB1A9C605A; Thu, 15 Sep 2022 19:57:20 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 07A4EC6057; Thu, 15 Sep 2022 19:57:20 +0000 (GMT) Received: from slate16.aus.stglabs.ibm.com (unknown [9.65.211.128]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 15 Sep 2022 19:57:19 +0000 (GMT) From: Eddie James To: jic23@kernel.org Cc: lars@metafoo.de, linux-iio@vger.kernel.org, joel@jms.id.au, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com, stable@vger.kernel.org, eajames@linux.ibm.com Subject: [PATCH v8 1/2] iio: pressure: dps310: Refactor startup procedure Date: Thu, 15 Sep 2022 14:57:18 -0500 Message-Id: <20220915195719.136812-2-eajames@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220915195719.136812-1-eajames@linux.ibm.com> References: <20220915195719.136812-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: -gqpTTCvVjJztPyfD0P8WJqDcHq6GdsP X-Proofpoint-ORIG-GUID: xBHCM3GjdVWX7PFikiaykwFyGEVEzzD9 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-15_10,2022-09-14_04,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 bulkscore=0 phishscore=0 lowpriorityscore=0 mlxlogscore=999 adultscore=0 impostorscore=0 malwarescore=0 priorityscore=1501 suspectscore=0 clxscore=1015 spamscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2209150119 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org Move the startup procedure into a function, and correct a missing check on the return code for writing the PRS_CFG register. Cc: Signed-off-by: Eddie James Reviewed-by: Joel Stanley Reviewed-by: Andy Shevchenko --- drivers/iio/pressure/dps310.c | 188 ++++++++++++++++++---------------- 1 file changed, 99 insertions(+), 89 deletions(-) diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c index 36fb7ae0d0a9..c706a8b423b5 100644 --- a/drivers/iio/pressure/dps310.c +++ b/drivers/iio/pressure/dps310.c @@ -159,6 +159,102 @@ static int dps310_get_coefs(struct dps310_data *data) return 0; } +/* + * Some versions of the chip will read temperatures in the ~60C range when + * it's actually ~20C. This is the manufacturer recommended workaround + * to correct the issue. The registers used below are undocumented. + */ +static int dps310_temp_workaround(struct dps310_data *data) +{ + int rc; + int reg; + + rc = regmap_read(data->regmap, 0x32, ®); + if (rc) + return rc; + + /* + * If bit 1 is set then the device is okay, and the workaround does not + * need to be applied + */ + if (reg & BIT(1)) + return 0; + + rc = regmap_write(data->regmap, 0x0e, 0xA5); + if (rc) + return rc; + + rc = regmap_write(data->regmap, 0x0f, 0x96); + if (rc) + return rc; + + rc = regmap_write(data->regmap, 0x62, 0x02); + if (rc) + return rc; + + rc = regmap_write(data->regmap, 0x0e, 0x00); + if (rc) + return rc; + + return regmap_write(data->regmap, 0x0f, 0x00); +} + +static int dps310_startup(struct dps310_data *data) +{ + int rc; + int ready; + + /* + * Set up pressure sensor in single sample, one measurement per second + * mode + */ + rc = regmap_write(data->regmap, DPS310_PRS_CFG, 0); + if (rc) + return rc; + + /* + * Set up external (MEMS) temperature sensor in single sample, one + * measurement per second mode + */ + rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT); + if (rc) + return rc; + + /* Temp and pressure shifts are disabled when PRC <= 8 */ + rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, + DPS310_PRS_SHIFT_EN | DPS310_TMP_SHIFT_EN, 0); + if (rc) + return rc; + + /* MEAS_CFG doesn't update correctly unless first written with 0 */ + rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, + DPS310_MEAS_CTRL_BITS, 0); + if (rc) + return rc; + + /* Turn on temperature and pressure measurement in the background */ + rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, + DPS310_MEAS_CTRL_BITS, DPS310_PRS_EN | + DPS310_TEMP_EN | DPS310_BACKGROUND); + if (rc) + return rc; + + /* + * Calibration coefficients required for reporting temperature. + * They are available 40ms after the device has started + */ + rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, + ready & DPS310_COEF_RDY, 10000, 40000); + if (rc) + return rc; + + rc = dps310_get_coefs(data); + if (rc) + return rc; + + return dps310_temp_workaround(data); +} + static int dps310_get_pres_precision(struct dps310_data *data) { int rc; @@ -677,52 +773,12 @@ static const struct iio_info dps310_info = { .write_raw = dps310_write_raw, }; -/* - * Some verions of chip will read temperatures in the ~60C range when - * its actually ~20C. This is the manufacturer recommended workaround - * to correct the issue. The registers used below are undocumented. - */ -static int dps310_temp_workaround(struct dps310_data *data) -{ - int rc; - int reg; - - rc = regmap_read(data->regmap, 0x32, ®); - if (rc < 0) - return rc; - - /* - * If bit 1 is set then the device is okay, and the workaround does not - * need to be applied - */ - if (reg & BIT(1)) - return 0; - - rc = regmap_write(data->regmap, 0x0e, 0xA5); - if (rc < 0) - return rc; - - rc = regmap_write(data->regmap, 0x0f, 0x96); - if (rc < 0) - return rc; - - rc = regmap_write(data->regmap, 0x62, 0x02); - if (rc < 0) - return rc; - - rc = regmap_write(data->regmap, 0x0e, 0x00); - if (rc < 0) - return rc; - - return regmap_write(data->regmap, 0x0f, 0x00); -} - static int dps310_probe(struct i2c_client *client, const struct i2c_device_id *id) { struct dps310_data *data; struct iio_dev *iio; - int rc, ready; + int rc; iio = devm_iio_device_alloc(&client->dev, sizeof(*data)); if (!iio) @@ -747,54 +803,8 @@ static int dps310_probe(struct i2c_client *client, if (rc) return rc; - /* - * Set up pressure sensor in single sample, one measurement per second - * mode - */ - rc = regmap_write(data->regmap, DPS310_PRS_CFG, 0); - - /* - * Set up external (MEMS) temperature sensor in single sample, one - * measurement per second mode - */ - rc = regmap_write(data->regmap, DPS310_TMP_CFG, DPS310_TMP_EXT); - if (rc < 0) - return rc; - - /* Temp and pressure shifts are disabled when PRC <= 8 */ - rc = regmap_write_bits(data->regmap, DPS310_CFG_REG, - DPS310_PRS_SHIFT_EN | DPS310_TMP_SHIFT_EN, 0); - if (rc < 0) - return rc; - - /* MEAS_CFG doesn't update correctly unless first written with 0 */ - rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, - DPS310_MEAS_CTRL_BITS, 0); - if (rc < 0) - return rc; - - /* Turn on temperature and pressure measurement in the background */ - rc = regmap_write_bits(data->regmap, DPS310_MEAS_CFG, - DPS310_MEAS_CTRL_BITS, DPS310_PRS_EN | - DPS310_TEMP_EN | DPS310_BACKGROUND); - if (rc < 0) - return rc; - - /* - * Calibration coefficients required for reporting temperature. - * They are available 40ms after the device has started - */ - rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, - ready & DPS310_COEF_RDY, 10000, 40000); - if (rc < 0) - return rc; - - rc = dps310_get_coefs(data); - if (rc < 0) - return rc; - - rc = dps310_temp_workaround(data); - if (rc < 0) + rc = dps310_startup(data); + if (rc) return rc; rc = devm_iio_device_register(&client->dev, iio); From patchwork Thu Sep 15 19:57:19 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Eddie James X-Patchwork-Id: 12977771 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 C0829C6FA90 for ; Thu, 15 Sep 2022 19:57:45 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S229919AbiIOT5n (ORCPT ); Thu, 15 Sep 2022 15:57:43 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:43698 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S229844AbiIOT5k (ORCPT ); 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Thu, 15 Sep 2022 19:57:22 GMT Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 0F50FC605A; Thu, 15 Sep 2022 19:57:22 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 23801C6057; Thu, 15 Sep 2022 19:57:21 +0000 (GMT) Received: from slate16.aus.stglabs.ibm.com (unknown [9.65.211.128]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 15 Sep 2022 19:57:21 +0000 (GMT) From: Eddie James To: jic23@kernel.org Cc: lars@metafoo.de, linux-iio@vger.kernel.org, joel@jms.id.au, linux-kernel@vger.kernel.org, andy.shevchenko@gmail.com, stable@vger.kernel.org, eajames@linux.ibm.com Subject: [PATCH v8 2/2] iio: pressure: dps310: Reset chip after timeout Date: Thu, 15 Sep 2022 14:57:19 -0500 Message-Id: <20220915195719.136812-3-eajames@linux.ibm.com> X-Mailer: git-send-email 2.31.1 In-Reply-To: <20220915195719.136812-1-eajames@linux.ibm.com> References: <20220915195719.136812-1-eajames@linux.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-GUID: HUFaBY96dM4Iio3VX-FjEhw64BDfopI8 X-Proofpoint-ORIG-GUID: J1ggYdEodygbWU3s8qtfysYFm6uKKic2 X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.205,Aquarius:18.0.895,Hydra:6.0.528,FMLib:17.11.122.1 definitions=2022-09-15_10,2022-09-14_04,2022-06-22_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 bulkscore=0 phishscore=0 suspectscore=0 clxscore=1015 priorityscore=1501 adultscore=0 spamscore=0 mlxlogscore=999 malwarescore=0 lowpriorityscore=0 impostorscore=0 mlxscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2209130000 definitions=main-2209150119 Precedence: bulk List-ID: X-Mailing-List: linux-iio@vger.kernel.org The DPS310 chip has been observed to get "stuck" such that pressure and temperature measurements are never indicated as "ready" in the MEAS_CFG register. The only solution is to reset the device and try again. In order to avoid continual failures, use a boolean flag to only try the reset after timeout once if errors persist. Fixes: ba6ec48e76bc ("iio: Add driver for Infineon DPS310") Cc: Signed-off-by: Eddie James Reviewed-by: Andy Shevchenko --- drivers/iio/pressure/dps310.c | 74 ++++++++++++++++++++++++++++++----- 1 file changed, 64 insertions(+), 10 deletions(-) diff --git a/drivers/iio/pressure/dps310.c b/drivers/iio/pressure/dps310.c index c706a8b423b5..984a3f511a1a 100644 --- a/drivers/iio/pressure/dps310.c +++ b/drivers/iio/pressure/dps310.c @@ -89,6 +89,7 @@ struct dps310_data { s32 c00, c10, c20, c30, c01, c11, c21; s32 pressure_raw; s32 temp_raw; + bool timeout_recovery_failed; }; static const struct iio_chan_spec dps310_channels[] = { @@ -393,11 +394,69 @@ static int dps310_get_temp_k(struct dps310_data *data) return scale_factors[ilog2(rc)]; } +static int dps310_reset_wait(struct dps310_data *data) +{ + int rc; + + rc = regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC); + if (rc) + return rc; + + /* Wait for device chip access: 2.5ms in specification */ + usleep_range(2500, 12000); + return 0; +} + +static int dps310_reset_reinit(struct dps310_data *data) +{ + int rc; + + rc = dps310_reset_wait(data); + if (rc) + return rc; + + return dps310_startup(data); +} + +static int dps310_ready_status(struct dps310_data *data, int ready_bit, int timeout) +{ + int sleep = DPS310_POLL_SLEEP_US(timeout); + int ready; + + return regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, ready & ready_bit, + sleep, timeout); +} + +static int dps310_ready(struct dps310_data *data, int ready_bit, int timeout) +{ + int rc; + + rc = dps310_ready_status(data, ready_bit, timeout); + if (rc) { + if (rc == -ETIMEDOUT && !data->timeout_recovery_failed) { + /* Reset and reinitialize the chip. */ + if (dps310_reset_reinit(data)) { + data->timeout_recovery_failed = true; + } else { + /* Try again to get sensor ready status. */ + if (dps310_ready_status(data, ready_bit, timeout)) + data->timeout_recovery_failed = true; + else + return 0; + } + } + + return rc; + } + + data->timeout_recovery_failed = false; + return 0; +} + static int dps310_read_pres_raw(struct dps310_data *data) { int rc; int rate; - int ready; int timeout; s32 raw; u8 val[3]; @@ -409,9 +468,7 @@ static int dps310_read_pres_raw(struct dps310_data *data) timeout = DPS310_POLL_TIMEOUT_US(rate); /* Poll for sensor readiness; base the timeout upon the sample rate. */ - rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, - ready & DPS310_PRS_RDY, - DPS310_POLL_SLEEP_US(timeout), timeout); + rc = dps310_ready(data, DPS310_PRS_RDY, timeout); if (rc) goto done; @@ -448,7 +505,6 @@ static int dps310_read_temp_raw(struct dps310_data *data) { int rc; int rate; - int ready; int timeout; if (mutex_lock_interruptible(&data->lock)) @@ -458,10 +514,8 @@ static int dps310_read_temp_raw(struct dps310_data *data) timeout = DPS310_POLL_TIMEOUT_US(rate); /* Poll for sensor readiness; base the timeout upon the sample rate. */ - rc = regmap_read_poll_timeout(data->regmap, DPS310_MEAS_CFG, ready, - ready & DPS310_TMP_RDY, - DPS310_POLL_SLEEP_US(timeout), timeout); - if (rc < 0) + rc = dps310_ready(data, DPS310_TMP_RDY, timeout); + if (rc) goto done; rc = dps310_read_temp_ready(data); @@ -756,7 +810,7 @@ static void dps310_reset(void *action_data) { struct dps310_data *data = action_data; - regmap_write(data->regmap, DPS310_RESET, DPS310_RESET_MAGIC); + dps310_reset_wait(data); } static const struct regmap_config dps310_regmap_config = {