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=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,INCLUDES_PATCH,MAILING_LIST_MULTI,SIGNED_OFF_BY, SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,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 578E0C55ABD for ; Tue, 10 Nov 2020 03:54:51 +0000 (UTC) Received: from merlin.infradead.org (merlin.infradead.org [205.233.59.134]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPS id D6786207BC for ; Tue, 10 Nov 2020 03:54:50 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.b="s1UoFl1B"; dkim=fail reason="signature verification failed" (1024-bit key) header.d=kernel.org header.i=@kernel.org header.b="NxxTwDZR" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org D6786207BC Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=kernel.org Authentication-Results: mail.kernel.org; spf=none smtp.mailfrom=linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=merlin.20170209; h=Sender:Content-Transfer-Encoding: Content-Type:Cc:List-Subscribe:List-Help:List-Post:List-Archive: List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To:Message-Id:Date: Subject:To:From:Reply-To:Content-ID:Content-Description:Resent-Date: Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID:List-Owner; bh=AF85K1pPGiKzMGCJlKqyVwiM7lmP6KXZrN1zo3JsOo8=; b=s1UoFl1BIM3MVUzGcNMKBV/Sh OZnGNqplsfe4Os1Mb1EkMBX2ooOMJWXeX8tKqV40E86sWBezg+/satI3vkC50doYJjkldI3rdNYSN xUF4NxminUniiM4Hn4w2GD+ByZAFftAz4xd9mpJ6oHSI6gLBHVfdimeDE4V/Ip+O4jXJkg2KqIkRe DT07vbq6OtZyH8lH7g010lcHNMNzzFsioIDNbzP3UCAEAW0UeNyWQP8GclcrhdFAyy75tmQPQZV7T q3C6m+i/Rc9oeW40+Ms+ifaSBabiQp6zNop6n1YoHfb/9MBW8JZJPx3YJzvmJTi1b93GyyQRQbbHf 3ZDk0Pi/g==; Received: from localhost ([::1] helo=merlin.infradead.org) by merlin.infradead.org with esmtp (Exim 4.92.3 #3 (Red Hat Linux)) id 1kcKjt-0001rr-2X; Tue, 10 Nov 2020 03:54:37 +0000 Received: from mail.kernel.org ([198.145.29.99]) by merlin.infradead.org with esmtps (Exim 4.92.3 #3 (Red Hat Linux)) id 1kcKja-0001jV-3o; Tue, 10 Nov 2020 03:54:19 +0000 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 4742120731; Tue, 10 Nov 2020 03:54:16 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1604980457; bh=JhdKaFlJpO4qT7Ve/Q6EhS4GgEaPVaOrcbkOBP1wpXg=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=NxxTwDZRc92/4Yead9RK3zL0vzFeBDm2ISHVr/fq0v3g9C8Zliy7KTUEUTayIY0gj B5oUEpo180Bm/S4BQYVz6lgdPCht1peyPNV5o7KuWZlRCmIjdurCgR1Zm01YSaByb7 9NKtjgWggBpxfGtKoIyjEb/kO76aXieZRHM5WFzo= From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Subject: [PATCH AUTOSEL 5.9 41/55] i2c: mediatek: move dma reset before i2c reset Date: Mon, 9 Nov 2020 22:53:04 -0500 Message-Id: <20201110035318.423757-41-sashal@kernel.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20201110035318.423757-1-sashal@kernel.org> References: <20201110035318.423757-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20201109_225418_275150_824E9573 X-CRM114-Status: GOOD ( 11.69 ) X-BeenThere: linux-mediatek@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Sasha Levin , Wolfram Sang , linux-mediatek@lists.infradead.org, linux-i2c@vger.kernel.org, Qii Wang , linux-arm-kernel@lists.infradead.org Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "Linux-mediatek" Errors-To: linux-mediatek-bounces+linux-mediatek=archiver.kernel.org@lists.infradead.org From: Qii Wang [ Upstream commit aafced673c06b7c77040c1df42e2e965be5d0376 ] The i2c driver default do dma reset after i2c reset, but sometimes i2c reset will trigger dma tx2rx, then apdma write data to dram which has been i2c_put_dma_safe_msg_buf(kfree). Move dma reset before i2c reset in mtk_i2c_init_hw to fix it. Signed-off-by: Qii Wang Signed-off-by: Wolfram Sang Signed-off-by: Sasha Levin --- drivers/i2c/busses/i2c-mt65xx.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) diff --git a/drivers/i2c/busses/i2c-mt65xx.c b/drivers/i2c/busses/i2c-mt65xx.c index 0cbdfbe605b55..33de99b7bc20c 100644 --- a/drivers/i2c/busses/i2c-mt65xx.c +++ b/drivers/i2c/busses/i2c-mt65xx.c @@ -475,6 +475,10 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) { u16 control_reg; + writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST); + udelay(50); + writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST); + mtk_i2c_writew(i2c, I2C_SOFT_RST, OFFSET_SOFTRESET); /* Set ioconfig */ @@ -529,10 +533,6 @@ static void mtk_i2c_init_hw(struct mtk_i2c *i2c) mtk_i2c_writew(i2c, control_reg, OFFSET_CONTROL); mtk_i2c_writew(i2c, I2C_DELAY_LEN, OFFSET_DELAY_LEN); - - writel(I2C_DMA_HARD_RST, i2c->pdmabase + OFFSET_RST); - udelay(50); - writel(I2C_DMA_CLR_FLAG, i2c->pdmabase + OFFSET_RST); } static const struct i2c_spec_values *mtk_i2c_get_spec(unsigned int speed) -- 2.27.0 _______________________________________________ Linux-mediatek mailing list Linux-mediatek@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-mediatek