From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751595AbdAYJdf (ORCPT ); Wed, 25 Jan 2017 04:33:35 -0500 Received: from mx0a-001ae601.pphosted.com ([67.231.149.25]:58199 "EHLO mx0b-001ae601.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1751401AbdAYJdb (ORCPT ); Wed, 25 Jan 2017 04:33:31 -0500 Authentication-Results: ppops.net; spf=none smtp.mailfrom=ckeepax@opensource.wolfsonmicro.com From: Charles Keepax To: CC: , , Subject: [PATCH v2] extcon: arizona: Wait for any running HPDETs to complete on jack removal Date: Wed, 25 Jan 2017 09:34:06 +0000 Message-ID: <1485336846-6440-1-git-send-email-ckeepax@opensource.wolfsonmicro.com> X-Mailer: git-send-email 2.1.4 MIME-Version: 1.0 Content-Type: text/plain X-Proofpoint-Spam-Details: rule=notspam policy=default score=0 priorityscore=1501 malwarescore=0 suspectscore=1 phishscore=0 bulkscore=0 spamscore=0 clxscore=1015 lowpriorityscore=0 impostorscore=0 adultscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.0.1-1612050000 definitions=main-1701250093 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org As the HPDET can't be aborted mid way through we should not allow any new insertion to be processed until the previous HPDET has finished. It is very unlikely but with low enough debounce settings you could start a new HPDET before the old one has completed, which results in an erroneous reading. Signed-off-by: Charles Keepax --- Changes since v1: - Added defines for the count and delay - Added a comment to explain why we call arizona_hpdet_wait Thanks, Charles drivers/extcon/extcon-arizona.c | 45 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 45 insertions(+) diff --git a/drivers/extcon/extcon-arizona.c b/drivers/extcon/extcon-arizona.c index ed78b7c..df98d84 100644 --- a/drivers/extcon/extcon-arizona.c +++ b/drivers/extcon/extcon-arizona.c @@ -1049,6 +1049,42 @@ static void arizona_hpdet_work(struct work_struct *work) mutex_unlock(&info->lock); } +#define ARIZONA_HPDET_WAIT_COUNT 15 +#define ARIZONA_HPDET_WAIT_DELAY_MS 20 + +static int arizona_hpdet_wait(struct arizona_extcon_info *info) +{ + struct arizona *arizona = info->arizona; + unsigned int val; + int i, ret; + + for (i = 0; i < ARIZONA_HPDET_WAIT_COUNT; i++) { + ret = regmap_read(arizona->regmap, ARIZONA_HEADPHONE_DETECT_2, + &val); + if (ret) { + dev_err(arizona->dev, + "Failed to read HPDET state: %d\n", ret); + return ret; + } + + switch (info->hpdet_ip_version) { + case 0: + if (val & ARIZONA_HP_DONE) + return 0; + break; + default: + if (val & ARIZONA_HP_DONE_B) + return 0; + break; + } + + msleep(ARIZONA_HPDET_WAIT_DELAY_MS); + } + + dev_err(arizona->dev, "HPDET did not appear to complete\n"); + return -ETIMEDOUT; +} + static irqreturn_t arizona_jackdet(int irq, void *data) { struct arizona_extcon_info *info = data; @@ -1155,6 +1191,15 @@ static irqreturn_t arizona_jackdet(int irq, void *data) "Removal report failed: %d\n", ret); } + /* + * If the jack was removed during a headphone detection we + * need to wait for the headphone detection to finish, as + * it can not be aborted. We don't want to be able to start + * a new headphone detection from a fresh insert until this + * one is finished. + */ + arizona_hpdet_wait(info); + regmap_update_bits(arizona->regmap, ARIZONA_JACK_DETECT_DEBOUNCE, ARIZONA_MICD_CLAMP_DB | ARIZONA_JD1_DB, -- 2.1.4