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=-9.8 required=3.0 tests=HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS, 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 60195C43331 for ; Wed, 25 Mar 2020 13:35:48 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 3A5132076A for ; Wed, 25 Mar 2020 13:35:48 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727920AbgCYNfr (ORCPT ); Wed, 25 Mar 2020 09:35:47 -0400 Received: from esa1.mentor.iphmx.com ([68.232.129.153]:4433 "EHLO esa1.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727374AbgCYNfp (ORCPT ); Wed, 25 Mar 2020 09:35:45 -0400 IronPort-SDR: QdAq0AvgMbwf1xFhNFGL3HBc/mAt4ovJ1lJvoJfXKCFGxtwHUX0YTaFOeWdbuIU6UGA32pJPGD VtGB4veY4RqtYg7kEqlqIA9pU6/8i5L2/IaM1x5tl0D+xqpCp/wdlrWfaB+gJXojZ1LbcfgqGr TDg+QrxhIqiDKMJMRBKuKiMc00eaaqvpX7+C3QKj1VAMTngpmdZvMV+6gScouoLQNQSd2RZ4H4 Kl7Us7xb87A2Y5IWu61P2rezMsZXVED+no30CpMdn6NcQbrvl2RUehB5jejqch8XGDNtWe7w6w Jp8= X-IronPort-AV: E=Sophos;i="5.72,304,1580803200"; d="scan'208";a="49060117" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa1.mentor.iphmx.com with ESMTP; 25 Mar 2020 05:35:44 -0800 IronPort-SDR: Ll9PkCVu6q7kMQqF7SqPX3yyN+qXPScuWFg/zzf39O0KZ/qnLLsdSs/FbC10bcMgPeT5L5ZRhP Mj4YJV2bCBRVyXfLrTEnP0I3cgzj0J9fjsEc66rC/EENprT1nz6ftKLRRNuiJlRMxiJnUeRXIN 7hdjcaV4/ZuIPr+56mw4ljFHPOVMqKYQmnSJiQnoxasfnhst833E9eD68frRvfEVqSMJBwpu/w jN2fk6JIBCNNt8jr7ahtJ+665L99QHgJe93KR8bpLdTFmRcZuwwCnmpim4RH2gxJgaZ0AgH0uc TJE= From: Jiada Wang To: , , , , , CC: , , , , Subject: [PATCH v9 31/55] Input: atmel_mxt_ts - delay enabling IRQ when not using regulators Date: Wed, 25 Mar 2020 06:33:10 -0700 Message-ID: <20200325133334.19346-32-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200325133334.19346-1-jiada_wang@mentor.com> References: <20200325133334.19346-1-jiada_wang@mentor.com> MIME-Version: 1.0 Content-Type: text/plain Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Nick Dyer The path of enabling the IRQ in the probe function is not safe in level triggered operation, if it was already powered up and there is a message waiting on the device (eg finger down) because the object table has not yet been read. This forces the ISR into a hard loop. Delay enabling the interrupt until it is first needed. Signed-off-by: Nick Dyer (cherry picked from ndyer/linux/for-upstream commit 64c9dadc4a3250a185baf06ab0f628be45d5d9a0) [gdavis: Resolve forward port conflicts due to v4.14-rc1 commit 8cc8446b9b62 ("Input: atmel_mxt_ts - use more managed resources") and applying upstream commit 96a938aa214e ("Input: atmel_mxt_ts - remove platform data support").] Signed-off-by: George G. Davis Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 40 +++++++++++++++--------- 1 file changed, 26 insertions(+), 14 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index 62f11afb26ae..c26470bcb38b 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -1448,9 +1448,24 @@ static int mxt_acquire_irq(struct mxt_data *data) { int error; - enable_irq(data->irq); + if (!data->irq) { + error = devm_request_threaded_irq(&data->client->dev, + data->client->irq, + NULL, mxt_interrupt, + IRQF_ONESHOT, + data->client->name, data); + if (error) { + dev_err(&data->client->dev, "Error requesting irq\n"); + return error; + } - if (data->use_retrigen_workaround) { + /* Presence of data->irq means IRQ initialised */ + data->irq = data->client->irq; + } else { + enable_irq(data->irq); + } + + if (data->object_table && data->use_retrigen_workaround) { error = mxt_process_messages_until_invalid(data); if (error) return error; @@ -3370,7 +3385,9 @@ static int mxt_load_fw(struct device *dev) goto release_firmware; } - enable_irq(data->irq); + ret = mxt_acquire_irq(data); + if (ret) + goto release_firmware; /* Poll after 0.1s if no interrupt received */ schedule_delayed_work(&data->flash->work, msecs_to_jiffies(100)); @@ -3798,7 +3815,6 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) client->adapter->nr, client->addr); data->client = client; - data->irq = client->irq; i2c_set_clientdata(client, data); init_completion(&data->chg_completion); @@ -3826,26 +3842,22 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) return error; } - error = devm_request_threaded_irq(&client->dev, client->irq, - NULL, mxt_interrupt, IRQF_ONESHOT, - client->name, data); - if (error) { - dev_err(&client->dev, "Failed to register interrupt\n"); - return error; - } - if (data->suspend_mode == MXT_SUSPEND_REGULATOR) { + error = mxt_acquire_irq(data); + if (error) + return error; + error = mxt_probe_regulators(data); if (error) return error; + + disable_irq(data->irq); } else if (data->reset_gpio) { msleep(MXT_RESET_GPIO_TIME); gpiod_set_value(data->reset_gpio, 1); msleep(MXT_RESET_INVALID_CHG); } - disable_irq(data->irq); - error = mxt_initialize(data); if (error) return error; -- 2.17.1