From patchwork Thu Mar 19 14:59:52 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 11447353 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id AB24B6CA for ; Thu, 19 Mar 2020 15:02:38 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 94A58215A4 for ; Thu, 19 Mar 2020 15:02:38 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727550AbgCSPCP (ORCPT ); Thu, 19 Mar 2020 11:02:15 -0400 Received: from esa1.mentor.iphmx.com ([68.232.129.153]:16097 "EHLO esa1.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728112AbgCSPCN (ORCPT ); Thu, 19 Mar 2020 11:02:13 -0400 IronPort-SDR: F0nOklVfXIA3ZcihUc3iikvUnwWRSlugPqhcFtLr9bQzOzWjkM8zA9qSDOZG+Pvt3mkcNcb7yv Lqz05usMIGuIatepm97flzXhPxjUy0sufyEDSR5z/nQYEUWFYnF2oAVSmIgRhZVSPSzYaY/PB1 H8m0/AIwAjAx9dh7LKjagl6p6qLqyELCdbI2L8bX9KXM3xOubL+DLSJlKAXrMrq1SgTEt0LJ1E DxUJIoA3qbQw2apC9mhQGvxNNFzcC1tYhKaitDXBjg1PvyjHAQTB9Swh7IqHnFNiFEhwTEPMYv q/0= X-IronPort-AV: E=Sophos;i="5.70,572,1574150400"; d="scan'208";a="48850327" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa1.mentor.iphmx.com with ESMTP; 19 Mar 2020 07:02:12 -0800 IronPort-SDR: Nlriu48f2o9f4dwVVGH1kWZpqLfke52zK27+jOufvshaOeOP7LBDviQPdlAZrcAe6HitimZWvU AUpHuvoTvzFEdB3W49z7clBm2O/IjnlgdM1xufkc6vxLkd8AjE649SFAy2OWhU8hueNxe7pruz S0oUwqIqkhqvpul8O+czh4YDOHBySsMaDZeZ88o0jPsaP4niL5Gclwa/C+fk5FqqU/pyhLSrS2 xkbGLu41xCJSLsN88IF8RsAszuQxg0ujL/FTaT6jeO6KSdfi/WUpI3DJQ8oLCo07L9D7vlSS8Q Rcw= From: Jiada Wang To: , , , , , CC: , , , , Subject: [PATCH v8 28/52] Input: atmel_mxt_ts - delay enabling IRQ when not using regulators Date: Thu, 19 Mar 2020 07:59:52 -0700 Message-ID: <20200319150016.61398-29-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200319150016.61398-1-jiada_wang@mentor.com> References: <20200319150016.61398-1-jiada_wang@mentor.com> MIME-Version: 1.0 Sender: linux-input-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-input@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 ad4a105fe591..a1a322f41f9e 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;