From patchwork Wed Feb 12 08:42:04 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 208206 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 919DCC352A4 for ; Wed, 12 Feb 2020 08:46:35 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 7256020714 for ; Wed, 12 Feb 2020 08:46:35 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728662AbgBLIqe (ORCPT ); Wed, 12 Feb 2020 03:46:34 -0500 Received: from esa2.mentor.iphmx.com ([68.232.141.98]:34515 "EHLO esa2.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1728642AbgBLIqe (ORCPT ); Wed, 12 Feb 2020 03:46:34 -0500 IronPort-SDR: 9+hPx7FG+WuQaZirnnQpDqYEVmKkmOwSIz9axa//AprH3dqwfo5R0albQ7VAFNzohaexh5k4Z8 beRv9JteVYwZpEjGJlONtgSnPS/1kvADN/ATEt6gQcoz7SpM7VajWYhF87HvvM8WnVwa469W/A zDbroIBw+YHTf78g/GE9SLTflpxqqcmmOYszHClTrKlusnYEhVnZfW+I+VnNT77+feYOas4ZWa JSX7NBmF9q+uTI/24gMgdiLIG9WnUHkUt9vz1nIwjxm7+IirrF34Jhk96dIrwmm8iu+012eswI yfU= X-IronPort-AV: E=Sophos;i="5.70,428,1574150400"; d="scan'208";a="45686274" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa2.mentor.iphmx.com with ESMTP; 12 Feb 2020 00:46:33 -0800 IronPort-SDR: 338N9LpBYCPreBsCB0iunxweU2EgUyR1i2ofs4QTLJKpKa9ii3Kv7giRv/Aoni14ydu1wGSLVC lvh+Yabozuc0/p5jcQ7A7beoNh/cKTHSbY0FYLCzrZe0SHWYbbyeJyxqWcfDYWhh0NKbIowAQQ h/knKwATCEbEf28ci3F9GDYYcxH2EYDQ0MWR4bVvnEGpKBGHJA/BJNJDYtmJ+dWukUNBaVvOzg qD81NNROr300cubnUUDqBtAXJNHTMT/62rOmI1YWRTvrybd/SOmYTIyCvkrvO4qoMy+56AOo+9 tAg= From: Jiada Wang To: , , , , , CC: , , , , Subject: [PATCH v7 34/48] input: atmel_mxt_ts: Add Missing Delay for reset handling of Atmel touch panel controller in detachable displays. Date: Wed, 12 Feb 2020 00:42:04 -0800 Message-ID: <20200212084218.32344-35-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200212084218.32344-1-jiada_wang@mentor.com> References: <20200212084218.32344-1-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: keerthikumarp In case of attached display, the touchpanel reset is controlled via imx gpio's from atmel driver and the delay between touchpanel reset and the time at which the chip becomes capable to communicate with the host processor, has be taken care. However in case of detachable displays, the touchpanel reset is controlled via a deserializer gpio which is triggered just before the atmel driver is probed.The delay between touchpanel reset and the time at which the chip becomes capable to communicate (as specified in datasheet) was not being accounted for. This patch introduces that delay. Signed-off-by: keerthikumarp Signed-off-by: George G. Davis Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index b4ec565ee7dd..9f4212aedd11 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -4109,6 +4109,10 @@ static int mxt_probe(struct i2c_client *client, const struct i2c_device_id *id) msleep(MXT_RESET_GPIO_TIME); gpiod_set_value(data->reset_gpio, 1); msleep(MXT_RESET_INVALID_CHG); + } else { + dev_dbg(&client->dev, + "atmel reset pin not found in device tree"); + msleep(MXT_RESET_TIME); } error = mxt_initialize(data);