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[209.132.180.67]) by mx.google.com with ESMTP id s22si1147724pfh.396.2018.02.03.00.01.46; Sat, 03 Feb 2018 00:02:01 -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=eEYK1KQR; dkim=pass header.i=@codeaurora.org header.s=default header.b=eEYK1KQR; 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 S1750860AbeBCIBD (ORCPT + 99 others); Sat, 3 Feb 2018 03:01:03 -0500 Received: from smtp.codeaurora.org ([198.145.29.96]:35876 "EHLO smtp.codeaurora.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752011AbeBCH7B (ORCPT ); Sat, 3 Feb 2018 02:59:01 -0500 Received: by smtp.codeaurora.org (Postfix, from userid 1000) id 748BC609F3; Sat, 3 Feb 2018 07:59:00 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1517644740; bh=KpmS96XD1MgU2B98n2wAFrdMB9zv0sGlfuwmcjACTIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eEYK1KQReaux2QcLLTc+FRxA5b0MekQwn2E9X2cmUF2kfylQV6PJPzeH6vSg7jXwO 4ibtB0YdOYdzth4CflC5exnPS7kFx1IxT9fUXK8ElEYlY7KdG7a2T43TtMrHgoaV4D umwZa8jWe1TjZQk6NeXsmWBD7G4e6pyz5sPuC7VY= 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 absahu-linux.qualcomm.com (blr-c-bdr-fw-01_globalnat_allzones-outside.qualcomm.com [103.229.19.19]) (using TLSv1.2 with cipher ECDHE-RSA-AES128-SHA256 (128/128 bits)) (No client certificate requested) (Authenticated sender: absahu@smtp.codeaurora.org) by smtp.codeaurora.org (Postfix) with ESMTPSA id 81B9C6079C; Sat, 3 Feb 2018 07:58:57 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=codeaurora.org; s=default; t=1517644740; bh=KpmS96XD1MgU2B98n2wAFrdMB9zv0sGlfuwmcjACTIA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=eEYK1KQReaux2QcLLTc+FRxA5b0MekQwn2E9X2cmUF2kfylQV6PJPzeH6vSg7jXwO 4ibtB0YdOYdzth4CflC5exnPS7kFx1IxT9fUXK8ElEYlY7KdG7a2T43TtMrHgoaV4D umwZa8jWe1TjZQk6NeXsmWBD7G4e6pyz5sPuC7VY= DMARC-Filter: OpenDMARC Filter v1.3.2 smtp.codeaurora.org 81B9C6079C 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=absahu@codeaurora.org From: Abhishek Sahu To: 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, Abhishek Sahu Subject: [PATCH 10/12] i2c: qup: send NACK for last read sub transfers Date: Sat, 3 Feb 2018 13:28:15 +0530 Message-Id: <1517644697-30806-11-git-send-email-absahu@codeaurora.org> X-Mailer: git-send-email 1.9.1 In-Reply-To: <1517644697-30806-1-git-send-email-absahu@codeaurora.org> References: <1517644697-30806-1-git-send-email-absahu@codeaurora.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: linux-kernel-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org According to I2c specification, “If a master-receiver sends a repeated START condition, it sends a not-acknowledge (A) just before the repeated START condition”. QUP v2 supports sending of NACK without stop with QUP_TAG_V2_DATARD_NACK so added the same. Signed-off-by: Abhishek Sahu --- drivers/i2c/busses/i2c-qup.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) diff --git a/drivers/i2c/busses/i2c-qup.c b/drivers/i2c/busses/i2c-qup.c index ba717bb..edea3b9 100644 --- a/drivers/i2c/busses/i2c-qup.c +++ b/drivers/i2c/busses/i2c-qup.c @@ -113,6 +113,7 @@ #define QUP_TAG_V2_DATAWR 0x82 #define QUP_TAG_V2_DATAWR_STOP 0x83 #define QUP_TAG_V2_DATARD 0x85 +#define QUP_TAG_V2_DATARD_NACK 0x86 #define QUP_TAG_V2_DATARD_STOP 0x87 /* Status, Error flags */ @@ -609,7 +610,9 @@ static int qup_i2c_set_tags(u8 *tags, struct qup_i2c_dev *qup, tags[len++] = QUP_TAG_V2_DATAWR_STOP; } else { if (msg->flags & I2C_M_RD) - tags[len++] = QUP_TAG_V2_DATARD; + tags[len++] = qup->blk.pos == (qup->blk.count - 1) ? + QUP_TAG_V2_DATARD_NACK : + QUP_TAG_V2_DATARD; else tags[len++] = QUP_TAG_V2_DATAWR; } -- QUALCOMM INDIA, on behalf of Qualcomm Innovation Center, Inc. is a member of Code Aurora Forum, hosted by The Linux Foundation