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=-9.6 required=3.0 tests=DKIM_SIGNED,DKIM_VALID, DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, 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 0F0A3C38A24 for ; Thu, 7 May 2020 07:47:55 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id DDE552075E for ; Thu, 7 May 2020 07:47:54 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="nNK4mY30" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1726572AbgEGHry (ORCPT ); Thu, 7 May 2020 03:47:54 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:42688 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-FAIL-OK-FAIL) by vger.kernel.org with ESMTP id S1725802AbgEGHrx (ORCPT ); Thu, 7 May 2020 03:47:53 -0400 Received: from mail-pf1-x443.google.com (mail-pf1-x443.google.com [IPv6:2607:f8b0:4864:20::443]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 8D696C061A10 for ; Thu, 7 May 2020 00:47:53 -0700 (PDT) Received: by mail-pf1-x443.google.com with SMTP id r14so2619303pfg.2 for ; Thu, 07 May 2020 00:47:53 -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; bh=q5Ur7h/8oNS0E2jiQqG3CicZ1bVNQn1Ydx7PFOHfa0s=; b=nNK4mY30ZNBYGbfOU+9i5o2jliUC1LdhvxIJ2ZO87SudcPGAnnFGXbZTMsiXEhwf7m Jxa73CekYqgCYnngBhiH1dCEkQZx5geSyKkBb4tD3ed0mreP1TbtJF6I7utnMGZuxlJv UODBWl6EmEvGefGxcmQyFBCQHVuBAYlKkj8VIut7+kLcEFiUF9992hEEULeLWFjr8smb 6fTBJ/6SdubUjWLX2TdgTQd6rFTb7xmuk6po5xbC9TphHS4l5Wu+/tjRoN7j98f/G8n4 XX7RU/9p/ZlZQR8NDpC6S+VulMYfNZti2D9v2v+LZAwczBAjrT0ZAigxbfSzHUbTgaya g8Bw== 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; bh=q5Ur7h/8oNS0E2jiQqG3CicZ1bVNQn1Ydx7PFOHfa0s=; b=hfiHATlCIzGIJGfmcHpYqR9roN8IAIvgT/dxI30DLxl2ssM6odf+C2Ty3zwMr7KRV+ jp3DFRCmdyvRnwm8K9M1MTWoX3me9CrkvAatZZMKxvoG7kRe0yrOjla7zC0HBWbQbXSP OyBjoz/6ar3r/jbsR9UPzpVLlhiRCESiGTi7QVtznQ66phoSL9VttxygB0TJxfPArntz Gqma+m0HG58LDu0oP12dIhsicFrMZeE0GPPPNSij6Fo0JWNURaTQrGeZDG7t9sValtTc gtZ+c+BHOg0Xns13R1I8qiJ/2AfUH/mNt+Fn1Q9ONWnm9TN5ywiH5IbUcZoC2YOvDOfh lOrg== X-Gm-Message-State: AGi0PuZP607c246ueRnDH2MjdJHlcpgDILDGmq3zowIEPC5eW+M3LyeF bYdULl2p4e1qYWk0v6XKDUU= X-Google-Smtp-Source: APiQypK4+BjtFPLf7XUZYBks21yWMjx7sY/apqXRD4CHcybnZTffrS+tMmDbVXT+H0leMJa4udLt0A== X-Received: by 2002:a63:41c2:: with SMTP id o185mr10336106pga.139.1588837673184; Thu, 07 May 2020 00:47:53 -0700 (PDT) Received: from fmin-OptiPlex-7060.nreal.work ([103.206.190.146]) by smtp.gmail.com with ESMTPSA id w192sm1146271pff.126.2020.05.07.00.47.50 (version=TLS1_2 cipher=ECDHE-ECDSA-AES128-GCM-SHA256 bits=128/128); Thu, 07 May 2020 00:47:52 -0700 (PDT) From: dillon.minfei@gmail.com To: mcoquelin.stm32@gmail.com, alexandre.torgue@st.com, philippe.schenker@toradex.com Cc: linux-stm32@st-md-mailman.stormreply.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, dillon min Subject: [PATCH 4/4] i2c: stm32f4: Fix stmpe811 get xyz data timeout issue Date: Thu, 7 May 2020 15:47:49 +0800 Message-Id: <1588837669-14362-1-git-send-email-dillon.minfei@gmail.com> X-Mailer: git-send-email 2.7.4 Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@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 time' from last two bytes to last one bytes. else, will get i2c timeout in reading touch screen coordinate. Signed-off-by: dillon min --- drivers/i2c/busses/i2c-stm32f4.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/i2c/busses/i2c-stm32f4.c b/drivers/i2c/busses/i2c-stm32f4.c index d6a69df..83004f2 100644 --- a/drivers/i2c/busses/i2c-stm32f4.c +++ b/drivers/i2c/busses/i2c-stm32f4.c @@ -439,7 +439,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev) int i; switch (msg->count) { - case 2: + case 1: /* * 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 +454,7 @@ 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 = 1; i > 0; i--) stm32f4_i2c_read_msg(i2c_dev); reg = i2c_dev->base + STM32F4_I2C_CR2; @@ -463,7 +463,7 @@ static void stm32f4_i2c_handle_rx_done(struct stm32f4_i2c_dev *i2c_dev) complete(&i2c_dev->complete); break; - case 3: + case 2: /* * In order to correctly generate the NACK pulse after the last * received data byte, we have to enable NACK before reading N-2 -- 2.7.4