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=-10.1 required=3.0 tests=DKIMWL_WL_HIGH,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,USER_AGENT_GIT autolearn=unavailable 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 93B6AC47409 for ; Fri, 14 Feb 2020 16:23:17 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.kernel.org (Postfix) with ESMTP id 64AEB24772 for ; Fri, 14 Feb 2020 16:23:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697397; bh=xTfDbkr37bVX7WPtntC0qxawFpQYpjYWedgmtw+jqao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=p6HWNGPMDHcL06U5klhV7HbXCdRCPZQUIwQoR61yx0x9XPRhrMtjfJljWF9Af5sRX 1ed7t2aFBMo62gNcTydoxFMhjAxg4H4Z6KPyt4iOWnJfFDNuVv7A8pOEspwXwLBJ7h NgMz5IjuJzcKV1FEmsQ1xbjgN5Psyt/DIs8c69lU= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S2404392AbgBNQXP (ORCPT ); Fri, 14 Feb 2020 11:23:15 -0500 Received: from mail.kernel.org ([198.145.29.99]:59340 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S2405563AbgBNQXO (ORCPT ); Fri, 14 Feb 2020 11:23:14 -0500 Received: from sasha-vm.mshome.net (c-73-47-72-35.hsd1.nh.comcast.net [73.47.72.35]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 28B4E24772; Fri, 14 Feb 2020 16:23:13 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1581697394; bh=xTfDbkr37bVX7WPtntC0qxawFpQYpjYWedgmtw+jqao=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=1Tg/SenFZQ5u6GeUiczqSc9HKSwyLrnct6FMqy5jEWNgvhfwSv7K+YvVnfyEbhZUr +B7lay2uzK2luMUsDg5uFExc+UJ6G4ujiGjR8pzMwx4oxu+c1C61U902b7zasFiBEK jlqOzKol0g2kWKFI6/plTXfjNqnxn7g1kQVN2cDg= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Philipp Zabel , Marco Felsch , Andy Shevchenko , Dmitry Torokhov , Sasha Levin , linux-input@vger.kernel.org Subject: [PATCH AUTOSEL 4.9 088/141] Input: edt-ft5x06 - work around first register access error Date: Fri, 14 Feb 2020 11:20:28 -0500 Message-Id: <20200214162122.19794-88-sashal@kernel.org> X-Mailer: git-send-email 2.20.1 In-Reply-To: <20200214162122.19794-1-sashal@kernel.org> References: <20200214162122.19794-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Philipp Zabel [ Upstream commit e112324cc0422c046f1cf54c56f333d34fa20885 ] The EP0700MLP1 returns bogus data on the first register read access (reading the threshold parameter from register 0x00): edt_ft5x06 2-0038: crc error: 0xfc expected, got 0x40 It ignores writes until then. This patch adds a dummy read after which the number of sensors and parameter read/writes work correctly. Signed-off-by: Philipp Zabel Signed-off-by: Marco Felsch Tested-by: Andy Shevchenko Reviewed-by: Andy Shevchenko Signed-off-by: Dmitry Torokhov Signed-off-by: Sasha Levin --- drivers/input/touchscreen/edt-ft5x06.c | 7 +++++++ 1 file changed, 7 insertions(+) diff --git a/drivers/input/touchscreen/edt-ft5x06.c b/drivers/input/touchscreen/edt-ft5x06.c index 28466e358fee1..22c8d2070faac 100644 --- a/drivers/input/touchscreen/edt-ft5x06.c +++ b/drivers/input/touchscreen/edt-ft5x06.c @@ -887,6 +887,7 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, { const struct edt_i2c_chip_data *chip_data; struct edt_ft5x06_ts_data *tsdata; + u8 buf[2] = { 0xfc, 0x00 }; struct input_dev *input; unsigned long irq_flags; int error; @@ -956,6 +957,12 @@ static int edt_ft5x06_ts_probe(struct i2c_client *client, return error; } + /* + * Dummy read access. EP0700MLP1 returns bogus data on the first + * register read access and ignores writes. + */ + edt_ft5x06_ts_readwrite(tsdata->client, 2, buf, 2, buf); + edt_ft5x06_ts_set_regs(tsdata); edt_ft5x06_ts_get_defaults(&client->dev, tsdata); edt_ft5x06_ts_get_parameters(tsdata); -- 2.20.1