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[209.132.180.67]) by mx.google.com with ESMTP id v14-v6si93117plo.730.2018.02.27.14.02.04; Tue, 27 Feb 2018 14:02:19 -0800 (PST) Received-SPF: pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) client-ip=209.132.180.67; Authentication-Results: mx.google.com; dkim=pass header.i=@codeaurora.org header.s=default header.b=mxQQdvgB; dkim=pass header.i=@codeaurora.org header.s=default header.b=XgmwUPin; spf=pass (google.com: best guess record for domain of linux-kernel-owner@vger.kernel.org designates 209.132.180.67 as permitted sender) smtp.mailfrom=linux-kernel-owner@vger.kernel.org Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1751907AbeB0WBK (ORCPT + 99 others); Tue, 27 Feb 2018 17:01:10 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:45508 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751641AbeB0WBG (ORCPT ); Tue, 27 Feb 2018 17:01:06 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 2406360265; Tue, 27 Feb 2018 22:01:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1519768866; bh=9vB9UNwdjkBAf9mugwDE4ycXB+WmXmaQcSt2PWFVFEM=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=mxQQdvgBKL020Odajv5j1nNyu7fqYqIfDhDbr3fP6Gr46KiOdBqjH34YuSmUSjQRi yW8b+oTljm6iA0Q2Q7aFwDUPuSsjg5HBiNdOjrfjUJ/jxHJ2Oc538yqvXVZy39z7A2 J0EJ2APVU1H/4emRvG4JVXpCd+aKIbrCWlZLw1dc= X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on pdx-caf-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-2.8 required=2.0 tests=ALL_TRUSTED,BAYES_00, DKIM_SIGNED,T_DKIM_INVALID autolearn=no autolearn_force=no version=3.4.0 Received: from [10.226.60.117] (i-global254.qualcomm.com [199.106.103.254]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-GCM-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: austinwc@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id A75CD60265; Tue, 27 Feb 2018 22:01:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1519768865; bh=9vB9UNwdjkBAf9mugwDE4ycXB+WmXmaQcSt2PWFVFEM=; h=Subject:To:Cc:References:From:Date:In-Reply-To:From; b=XgmwUPinhOQFu2xpHio+Z0qxj2equJhcX5m1OZJW95SHT0iRApmtRGV0dez+i+oYl +wguTPKRHVtMVv5K6+BJrNHXiZ5NCxuzAwjVfK/H+KajMhkHTK0g9HtA8cpUEZaXiN ZArLMBTysbTSrc0N6yw5Kp4nGZLHjHgA4sYsqDio= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org A75CD60265 Authentication-Results: pdx-caf-mail.web.codeaurora.org; dmarc=none (p=none dis=none) header.from=codeaurora.org Authentication-Results: pdx-caf-mail.web.codeaurora.org; spf=none smtp.mailfrom=austinwc@codeaurora.org Subject: Re: [PATCH 07/12] i2c: qup: use the complete transfer length to choose DMA mode To: Abhishek Sahu , Andy Gross , Wolfram Sang Cc: David Brown , Sricharan R , linux-arm-msm@vger.kernel.org, linux-soc@vger.kernel.org, linux-i2c@vger.kernel.org, linux-kernel@vger.kernel.org References: <1517644697-30806-1-git-send-email-absahu@codeaurora.org> <1517644697-30806-8-git-send-email-absahu@codeaurora.org> From: "Christ, Austin" Message-ID: Date: Tue, 27 Feb 2018 15:01:04 -0700 User-Agent: Mozilla/5.0 (Windows NT 10.0; WOW64; rv:52.0) Gecko/20100101 Thunderbird/52.6.0 MIME-Version: 1.0 In-Reply-To: <1517644697-30806-8-git-send-email-absahu@codeaurora.org> Content-Type: text/plain; charset=utf-8; format=flowed Content-Language: en-US Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Tested on Centriq 2400 Reviewed-by: Austin Christ On 2/3/2018 12:58 AM, Abhishek Sahu wrote: > Currently each message length in complete transfer is being > checked for determining DMA mode and if any of the message length > is less than FIFO length then non DMA mode is being used which > will increase overhead. DMA can be used for any length and it > should be determined with complete transfer length. Now, this > patch introduces DMA threshold length and the transfer will be > done in DMA mode if the total length is greater than this > threshold length. > > Signed-off-by: Abhishek Sahu > --- > drivers/i2c/busses/i2c-qup.c | 15 +++++++++------ > 1 file changed, 9 insertions(+), 6 deletions(-) > > diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c > index 6227a5c..a91fc70 100644 > --- a/drivers/i2c/busses/i2c-qup.c > +++ b/drivers/i2c/busses/i2c-qup.c > @@ -192,6 +192,8 @@ struct qup_i2c_dev { > bool is_dma; > /* To check if the current transfer is using DMA */ > bool use_dma; > + /* The threshold length above which DMA will be used */ > + unsigned int dma_threshold; > struct dma_pool *dpool; > struct qup_i2c_tag start_tag; > struct qup_i2c_bam brx; > @@ -1294,7 +1296,8 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap, > int num) > { > struct qup_i2c_dev *qup = i2c_get_adapdata(adap); > - int ret, len, idx = 0; > + int ret, idx = 0; > + unsigned int total_len = 0; > > qup->bus_err = 0; > qup->qup_err = 0; > @@ -1320,14 +1323,13 @@ static int qup_i2c_xfer_v2(struct i2c_adapter *adap, > goto out; > } > > - len = (msgs[idx].len > qup->out_fifo_sz) || > - (msgs[idx].len > qup->in_fifo_sz); > - > - if (is_vmalloc_addr(msgs[idx].buf) || !len) > + if (is_vmalloc_addr(msgs[idx].buf)) > break; > + > + total_len += msgs[idx].len; > } > > - if (idx == num) > + if (idx == num && total_len > qup->dma_threshold) > qup->use_dma = true; > } > > @@ -1587,6 +1589,7 @@ static int qup_i2c_probe(struct platform_device *pdev) > > size = QUP_INPUT_FIFO_SIZE(io_mode); > qup->in_fifo_sz = qup->in_blk_sz * (2 << size); > + qup->dma_threshold = min(qup->out_fifo_sz, qup->in_fifo_sz); > > fs_div = ((src_clk_freq / clk_freq) / 2) - 3; > hs_div = 3; > -- Qualcomm Datacenter Technologies as an affiliate of Qualcomm Technologies, Inc. Qualcomm Technologies, Inc. is a member of the Code Aurora Forum, a Linux Foundation Collaborative Project.