From patchwork Tue Jun 9 13:26:43 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Dillon Min X-Patchwork-Id: 1305951 Return-Path: X-Original-To: incoming@patchwork.ozlabs.org Delivered-To: patchwork-incoming@bilbo.ozlabs.org Authentication-Results: ozlabs.org; spf=pass (sender SPF authorized) smtp.mailfrom=vger.kernel.org (client-ip=23.128.96.18; helo=vger.kernel.org; envelope-from=linux-i2c-owner@vger.kernel.org; receiver=) Authentication-Results: ozlabs.org; dmarc=pass (p=none dis=none) header.from=gmail.com Authentication-Results: ozlabs.org; dkim=pass (2048-bit key; unprotected) header.d=gmail.com header.i=@gmail.com header.a=rsa-sha256 header.s=20161025 header.b=miEUbzjc; dkim-atps=neutral Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by ozlabs.org (Postfix) with ESMTP id 49h9rq3cyYz9sTG for ; Tue, 9 Jun 2020 23:27:07 +1000 (AEST) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729613AbgFIN1F (ORCPT ); Tue, 9 Jun 2020 09:27:05 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:57178 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1729584AbgFIN1C (ORCPT ); Tue, 9 Jun 2020 09:27:02 -0400 Received: from mail-pf1-x444.google.com (mail-pf1-x444.google.com [IPv6:2607:f8b0:4864:20::444]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id D4EB6C03E97C; Tue, 9 Jun 2020 06:27:02 -0700 (PDT) Received: by mail-pf1-x444.google.com with SMTP id x22so10075016pfn.3; Tue, 09 Jun 2020 06:27:02 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:in-reply-to:references; bh=kSIhf0lGTJhWcv+DccCkvFsMqMLpno9qIeBkBoJLMSQ=; b=miEUbzjcd4ryUuKvQRtvf6dPM1igWZ99p8Q6FEwRjbx4OnKVBKqoYcgFbYQa5F0CiQ rad6clrM7rHVgJjWaSGo+06n0jk3qugJoFhZ4uC0qWxdyIT7OsuLI2/YDruuF8Z4O1tE 3XN5SBV4IyX/VaBuWAY0GE0AqxS6UYPKNE6P36cTd2+X9MqvjpDifrfLKMc7i/xQMqjI 0Jpz/z0K3veRZWdMO4osYMwcAjH9FlU16JqTA5cQjsc0gOOqUvfPxAU2tZRhWde0L8Zi TU7lbJxux9j2OvqpbG0zJUIieSCW7zCWuGtwSDwgsR2FLhku1pZlyh+CPVWh2iayMnyj JFHw== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:in-reply-to :references; bh=kSIhf0lGTJhWcv+DccCkvFsMqMLpno9qIeBkBoJLMSQ=; b=QlHxvw72+rQXqChrF6J1Rkbftgb0XvH1WCWi/a2IvjEPKBD0wB2OUCWRSbz8la4BqW 49HiiS0rJrUyluBXxePnpz2/xUu+5Jp1STYzjg6+nXSpq1U98XwRHwtdLvqb9yQgnyCC DC6L7rcdcVEgJv8qaMN2Arf8KVV1J/kdWNRXwNdcePVEioc6qh92rCenu4whBKG91GpD hw8PF5Ovzdjxlx0dv4ntOe69d2Ql16iIVF5nAr7DihdOwHisL88f27sf2XDPmD449/FQ eyT3cLrgCXqBx33z4ygW5WbR3m/Q6I6umfu3ofrbmk8tP1vs4WfI2fFZNOQB/ZIWoh0g OA/g== X-Gm-Message-State: AOAM531wwOMYVSKgmRI6axUdpHB1j79F7UutAqjmDSIT1sZ1v8SFx4SK PfKPSFcvhhIabD+AaJKd670= X-Google-Smtp-Source: ABdhPJygotx9ln59z0STkYKtMU1xO9pxH7iXYS1GxlB8u1JiD2/tkQhL5M40gjWnv1oxbN80JE9mRA== X-Received: by 2002:a63:a36e:: with SMTP id v46mr23872632pgn.378.1591709222448; Tue, 09 Jun 2020 06:27:02 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([103.206.191.42]) by smtp.gmail.com with ESMTPSA id b5sm2624348pjz.34.2020.06.09.06.26.59 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Tue, 09 Jun 2020 06:27:02 -0700 (PDT) From: dillon.minfei@gmail.com To: robh+dt@kernel.org, mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, p.zabel@pengutronix.de, pierre-yves.mordret@st.com, philippe.schenker@toradex.com Cc: linux-kernel@vger.kernel.org, linux-arm-kernel@lists.infradead.org, linux-stm32@st-md-mailman.stormreply.com, linux-i2c@vger.kernel.org, devicetree@vger.kernel.org, dillon min Subject: [PATCH v4 4/4] i2c: stm32f4: Fix stmpe811 get xyz data timeout issue Date: Tue, 9 Jun 2020 21:26:43 +0800 Message-Id: <1591709203-12106-5-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1591709203-12106-1-git-send-email-dillon.minfei@gmail.com> References: <1591709203-12106-1-git-send-email-dillon.minfei@gmail.com> Sender: linux-i2c-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-i2c@vger.kernel.org From: dillon min as stm32f429's internal flash is 2Mbytes and compiled kernel image bigger than 2Mbytes, so we have to load kernel image to sdram on stm32f429-disco board which has 8Mbytes sdram space. based on above context, as you knows kernel running on external sdram is more slower than internal flash. besides, we need read 4 bytes to get touch screen xyz(x, y, pressure) coordinate data in stmpe811 interrupt. so, in stm32f4_i2c_handle_rx_done, as i2c read slower than running in xip mode, have to adjust 'STOP/START bit set position' from last two bytes to last one bytes. else, will get i2c timeout in reading touch screen coordinate. to not take side effect, introduce IIC_LAST_BYTE_POS to support xip kernel or has mmu platform. Signed-off-by: dillon min --- V4: indroduce 'IIC_LAST_BYTE_POS' to compatible with xipkernel boot drivers/i2c/busses/i2c-stm32f4.c | 12 +++++++++--- 1 file changed, 9 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-stm32f4.c b/drivers/i2c/busses/i2c-stm32f4.c index d6a69dfcac3f..97cf42ae7fa0 100644 --- a/drivers/i2c/busses/i2c-stm32f4.c +++ b/drivers/i2c/busses/i2c-stm32f4.c @@ -93,6 +93,12 @@ #define STM32F4_I2C_MAX_FREQ 46U #define HZ_TO_MHZ 1000000 +#if !defined(CONFIG_MMU) && !defined(CONFIG_XIP_KERNEL) +#define IIC_LAST_BYTE_POS 1 +#else +#define IIC_LAST_BYTE_POS 2 +#endif + /** * struct stm32f4_i2c_msg - client specific data * @addr: 8-bit slave addr, including r/w bit @@ -439,7 +445,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev) int i; switch (msg->count) { - case 2: + case IIC_LAST_BYTE_POS: /* * In order to correctly send the Stop or Repeated Start * condition on the I2C bus, the STOP/START bit has to be set @@ -454,7 +460,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev) else stm32f4_i2c_set_bits(reg, STM32F4_I2C_CR1_START); - for (i = 2; i > 0; i--) + for (i = IIC_LAST_BYTE_POS; i > 0; i--) stm32f4_i2c_read_msg(i2c_dev); reg = i2c_dev->base + STM32F4_I2C_CR2; @@ -463,7 +469,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev) complete(&i2c_dev->complete); break; - case 3: + case (IIC_LAST_BYTE_POS+1): /* * In order to correctly generate the NACK pulse after the last * received data byte, we have to enable NACK before reading N-2