From patchwork Fri May 8 05:56:34 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: "Wang, Jiada" X-Patchwork-Id: 11535591 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 09AE7159A for ; Fri, 8 May 2020 05:59:15 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id EF5BD20736 for ; Fri, 8 May 2020 05:59:14 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1728135AbgEHF7N (ORCPT ); Fri, 8 May 2020 01:59:13 -0400 Received: from esa4.mentor.iphmx.com ([68.232.137.252]:45906 "EHLO esa4.mentor.iphmx.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727104AbgEHF7L (ORCPT ); Fri, 8 May 2020 01:59:11 -0400 IronPort-SDR: jfPRDni3ID5y+fB4XIX5JpaTu5nP9IcU1Tzn6Nl8Z1jz6xwHoLG+e4zAl6G+QkA8Uw/pLfQw7F AW39tTuwP7mIYdEFOnxHGLdGJ3rUJFLYseUPSlhDe1C4ov1xXpgoLZanTMJAWzKTnKH1nBHL3H T7ifeAqPYuu+amxZETj/Kx0rhQdEKvyA3symzMybA1JIn85PcY1EOUf+P91DpC0Kn9UYJeZZcN azzJmI9h4cZgnu4zAqrBNum5SptwHVDitOGjlF3wQwrs0/5U2tAVR1eKxuOvpRaCvkzfpcpRnn dGA= X-IronPort-AV: E=Sophos;i="5.73,366,1583222400"; d="scan'208";a="48710642" Received: from orw-gwy-02-in.mentorg.com ([192.94.38.167]) by esa4.mentor.iphmx.com with ESMTP; 07 May 2020 21:59:10 -0800 IronPort-SDR: UGKK+VPLcMG2JA7Uk25hVenxe0MD08k/t+6TNNmbFtN+bChXMlwXmswSa7dov9Hq0Dn5GnVM8e ++Pe4gGn4WBoDOHrJS1c5BOvA655q3N3kZAfmlrlvwMvFhkurlkqPD1K2nmMqfZQjlSfyjviC2 o16yUWLqswnnAYiqH84k15mhEPvWilzxtRce9GPfwJ+2YJOKYY7xmkv+x2bwqBHnaEymeOA/lt ctUjm8UxOAV4jS/bIAfTPOskgCqhcSeOW5igm8/lv0+YVnq2wZiPUWjebzC325OD9vZwJgCDE4 lIQ= From: Jiada Wang To: , , , , CC: , , , , Subject: [PATCH v11 34/56] Input: atmel_mxt_ts - implement I2C retries Date: Thu, 7 May 2020 22:56:34 -0700 Message-ID: <20200508055656.96389-35-jiada_wang@mentor.com> X-Mailer: git-send-email 2.17.1 In-Reply-To: <20200508055656.96389-1-jiada_wang@mentor.com> References: <20200508055656.96389-1-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 Some maXTouch chips (eg mXT1386) will not respond on the first I2C request when they are in a sleep state. It must be retried after a delay for the chip to wake up. Signed-off-by: Nick Dyer Acked-by: Yufeng Shen (cherry picked from ndyer/linux/for-upstream commit 63fd7a2cd03c3a572a5db39c52f4856819e1835d) [gdavis: Forward port and fix conflicts.] Signed-off-by: George G. Davis Signed-off-by: Jiada Wang --- drivers/input/touchscreen/atmel_mxt_ts.c | 45 ++++++++++++++++-------- 1 file changed, 30 insertions(+), 15 deletions(-) diff --git a/drivers/input/touchscreen/atmel_mxt_ts.c b/drivers/input/touchscreen/atmel_mxt_ts.c index ab4eceac8fe7..152069c3e15d 100644 --- a/drivers/input/touchscreen/atmel_mxt_ts.c +++ b/drivers/input/touchscreen/atmel_mxt_ts.c @@ -217,6 +217,7 @@ enum t100_type { #define MXT_CRC_TIMEOUT 1000 /* msec */ #define MXT_FW_RESET_TIME 3000 /* msec */ #define MXT_FW_CHG_TIMEOUT 300 /* msec */ +#define MXT_WAKEUP_TIME 25 /* msec */ #define MXT_REGULATOR_DELAY 150 /* msec */ #define MXT_CHG_DELAY 100 /* msec */ #define MXT_POWERON_DELAY 150 /* msec */ @@ -721,6 +722,7 @@ static int __mxt_read_chunk(struct i2c_client *client, struct i2c_msg xfer[2]; u8 buf[2]; int ret; + bool retry = false; buf[0] = reg & 0xff; buf[1] = (reg >> 8) & 0xff; @@ -737,17 +739,22 @@ static int __mxt_read_chunk(struct i2c_client *client, xfer[1].len = len; xfer[1].buf = val; - ret = i2c_transfer(client->adapter, xfer, 2); - if (ret == 2) { - ret = 0; - } else { - if (ret >= 0) - ret = -EIO; - dev_err(&client->dev, "%s: i2c transfer failed (%d)\n", - __func__, ret); +retry_read: + ret = i2c_transfer(client->adapter, xfer, ARRAY_SIZE(xfer)); + if (ret != ARRAY_SIZE(xfer)) { + if (!retry) { + dev_dbg(&client->dev, "%s: i2c retry\n", __func__); + msleep(MXT_WAKEUP_TIME); + retry = true; + goto retry_read; + } else { + dev_err(&client->dev, "%s: i2c transfer failed (%d)\n", + __func__, ret); + return -EIO; + } } - return ret; + return 0; } static int __mxt_read_reg(struct i2c_client *client, @@ -778,6 +785,7 @@ static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len, u8 *buf; size_t count; int ret; + bool retry = false; count = len + 2; buf = kmalloc(count, GFP_KERNEL); @@ -788,14 +796,21 @@ static int __mxt_write_reg(struct i2c_client *client, u16 reg, u16 len, buf[1] = (reg >> 8) & 0xff; memcpy(&buf[2], val, len); +retry_write: ret = i2c_master_send(client, buf, count); - if (ret == count) { - ret = 0; - } else { - if (ret >= 0) + if (ret != count) { + if (!retry) { + dev_dbg(&client->dev, "%s: i2c retry\n", __func__); + msleep(MXT_WAKEUP_TIME); + retry = true; + goto retry_write; + } else { + dev_err(&client->dev, "%s: i2c send failed (%d)\n", + __func__, ret); ret = -EIO; - dev_err(&client->dev, "%s: i2c send failed (%d)\n", - __func__, ret); + } + } else { + ret = 0; } kfree(buf);