From patchwork Fri Oct 25 18:10:07 2024 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Jyothi Kumar Seerapu X-Patchwork-Id: 13851283 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from gabe.freedesktop.org (gabe.freedesktop.org [131.252.210.177]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 03593D149DA for ; Fri, 25 Oct 2024 18:10:38 +0000 (UTC) Received: from gabe.freedesktop.org (localhost [127.0.0.1]) by gabe.freedesktop.org (Postfix) with ESMTP id 8A90D10EB6A; Fri, 25 Oct 2024 18:10:37 +0000 (UTC) Authentication-Results: gabe.freedesktop.org; dkim=pass (2048-bit key; unprotected) header.d=quicinc.com header.i=@quicinc.com header.b="B9KhsNqg"; dkim-atps=neutral Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by gabe.freedesktop.org (Postfix) with ESMTPS id D2A9610EB6A for ; Fri, 25 Oct 2024 18:10:35 +0000 (UTC) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.18.1.2/8.18.1.2) with ESMTP id 49PBowBO009099; Fri, 25 Oct 2024 18:10:30 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h= cc:content-type:date:from:message-id:mime-version:subject:to; s= qcppdkim1; bh=sxUUwmhFaPuoMwnZaOrlOdteCBTzOmWEbOZ3EA4q5B0=; b=B9 KhsNqg5Uju0YmojfqFyDc/wO1rutaFMWu8ZkLTQ0Sd1pThirlHTySGR68e3rb1JO FbPCJ7HIZxBup4Od4GLwBe4IExJkqj6jI0CkwPf/Ws5MA18SI4XIwjOlk9NiGb6B j0Hpx5ulOkyVVpmwxxIvBUpUWDmQN3bZIqSEwrgAuJEDVjtBtcMvQYKyjJHanTgV 96U+lxbiDkmxKWRjIgwcM2nR+sd5Wa95FG8+Wx5SSvNSxALLoIKcoc0rjNufbUZ7 yOHwm03fhJjpHLBLyDpUkA9SwIglvUt3QIlOzlqs2PoFM0GMNaP5Aeffxb89xn+m X8OD9gVwJFMoTsOCBZeA== Received: from nasanppmta03.qualcomm.com (i-global254.qualcomm.com [199.106.103.254]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 42em43j1q3-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Oct 2024 18:10:29 +0000 (GMT) Received: from nasanex01b.na.qualcomm.com (nasanex01b.na.qualcomm.com [10.46.141.250]) by NASANPPMTA03.qualcomm.com (8.18.1.2/8.18.1.2) with ESMTPS id 49PIAStK023486 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Fri, 25 Oct 2024 18:10:28 GMT Received: from hu-jseerapu-hyd.qualcomm.com (10.80.80.8) by nasanex01b.na.qualcomm.com (10.46.141.250) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.2.1544.9; Fri, 25 Oct 2024 11:10:24 -0700 From: Jyothi Kumar Seerapu To: Vinod Koul , Andi Shyti , "Sumit Semwal" , =?utf-8?q?Christian_K=C3=B6nig?= CC: , , , , , , , , Subject: [PATCH v2 0/3] Add Block event interrupt support for I2C protocol Date: Fri, 25 Oct 2024 23:40:07 +0530 Message-ID: <20241025181010.7555-1-quic_jseerapu@quicinc.com> X-Mailer: git-send-email 2.17.1 MIME-Version: 1.0 X-Originating-IP: [10.80.80.8] X-ClientProxiedBy: nasanex01a.na.qualcomm.com (10.52.223.231) To nasanex01b.na.qualcomm.com (10.46.141.250) X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-GUID: G3ymxqY7NZ-QQOQ6UtigGScoJJVLo1ra X-Proofpoint-ORIG-GUID: G3ymxqY7NZ-QQOQ6UtigGScoJJVLo1ra X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.293,Aquarius:18.0.1039,Hydra:6.0.680,FMLib:17.12.60.29 definitions=2024-09-06_09,2024-09-06_01,2024-09-02_01 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 lowpriorityscore=0 adultscore=0 mlxlogscore=999 spamscore=0 malwarescore=0 impostorscore=0 phishscore=0 bulkscore=0 clxscore=1015 priorityscore=1501 suspectscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.19.0-2409260000 definitions=main-2410250138 X-BeenThere: dri-devel@lists.freedesktop.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Direct Rendering Infrastructure - Development List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dri-devel-bounces@lists.freedesktop.org Sender: "dri-devel" The I2C driver gets an interrupt upon transfer completion. For multiple messages in a single transfer, N interrupts will be received for N messages, leading to significant software interrupt latency. To mitigate this latency, utilize Block Event Interrupt (BEI) only when an interrupt is necessary. This means large transfers can be split into multiple chunks of 8 messages internally, without expecting interrupts for the first 7 messages completion, only the last one will trigger an interrupt indicating 8 messages completed. By implementing BEI, multi-message transfers can be divided into chunks of 8 messages, improving overall transfer time. This optimization reduces transfer time from 168 ms to 48 ms for a series of 200 I2C write messages in a single transfer, with a clock frequency support of 100 kHz. BEI optimizations are currently implemented for I2C write transfers only, as there is no use case for multiple I2C read messages in a single transfer at this time. v1 -> v2: - DT changes are reverted for adding dma channel size as a new arg of dma-cells property. - DT binding change reveted for ma channel size as a new arg of dma-cells property. - In GPI driver, reverted the changes to parse the channel TRE size from device tree. - Made the changes in QCOM I2C geni driver to support the BEI functionality with the existing TRE size of 64. - Made changes in QCOM I2C geni driver as per the review comments. - Fixed Kernel test robot reported compiltion issues Jyothi Kumar Seerapu (3): dmaengine: qcom: gpi: Add GPI Block event interrupt support i2c: qcom_geni: Update compile dependenices for qcom geni i2c: i2c-qcom-geni: Add Block event interrupt support drivers/dma/qcom/gpi.c | 49 +++++++ drivers/i2c/busses/Kconfig | 1 + drivers/i2c/busses/i2c-qcom-geni.c | 203 +++++++++++++++++++++++++---- include/linux/dma/qcom-gpi-dma.h | 37 ++++++ 4 files changed, 265 insertions(+), 25 deletions(-) base-commit: 55bcd2e0d04c1171d382badef1def1fd04ef66c5