From patchwork Tue Jul 25 11:48:08 2023 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Vijaya Krishna Nivarthi X-Patchwork-Id: 13326353 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 vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 1E632C001DF for ; Tue, 25 Jul 2023 11:48:37 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S231247AbjGYLsf (ORCPT ); Tue, 25 Jul 2023 07:48:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56036 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235147AbjGYLs3 (ORCPT ); Tue, 25 Jul 2023 07:48:29 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id BC64C10E2; Tue, 25 Jul 2023 04:48:28 -0700 (PDT) Received: from pps.filterd (m0279871.ppops.net [127.0.0.1]) by mx0a-0031df01.pphosted.com (8.17.1.19/8.17.1.19) with ESMTP id 36PAqb77003492; Tue, 25 Jul 2023 11:48:23 GMT DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=quicinc.com; h=from : to : cc : subject : date : message-id : in-reply-to : references; s=qcppdkim1; bh=cxS/vjm5g4KmLmNLXOOC61HZLgtcILclQ/JcLeOPzHQ=; b=diPzOX4sQonsbZukUXtqUmS35PA2rBrR2Pp8oRt/mcEWt1FZ69VZvytF6vHwWHAVxyE3 WdO9lKGyGht9PmOGcimJtoBGgACztqdi83DXsEokad0xcDpy/X4wNL2bgWxg3+An1SCg jDu2rrXtRZ4B9WW9jtbrBl+2BAzIagd9vP0sEfyEl2BcN3EKFEmkDOo7mXS9Q6SiSykF Skdsa0RnrXaBN2bmZ7UHtKZ+UQALxvLM/b/otYoLTFwDB8Qvm3J6V+k4GFD83Eg2Q7na iIal6itycj4BhNdKwbZ0WEZYM9usLbmNe8ArqWucIdOxQhLeuoUr4s6t8EU4eUHmfZ8P 3A== Received: from apblrppmta01.qualcomm.com (blr-bdr-fw-01_GlobalNAT_AllZones-Outside.qualcomm.com [103.229.18.19]) by mx0a-0031df01.pphosted.com (PPS) with ESMTPS id 3s1qastu87-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 Jul 2023 11:48:22 +0000 Received: from pps.filterd (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (8.17.1.5/8.17.1.5) with ESMTP id 36PBmFHo008429; Tue, 25 Jul 2023 11:48:20 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 3s086kv0ym-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 25 Jul 2023 11:48:20 +0000 Received: from APBLRPPMTA01.qualcomm.com (APBLRPPMTA01.qualcomm.com [127.0.0.1]) by pps.reinject (8.17.1.5/8.17.1.5) with ESMTP id 36PBmJP2008468; Tue, 25 Jul 2023 11:48:19 GMT Received: from hu-sgudaval-hyd.qualcomm.com (hu-vnivarth-hyd.qualcomm.com [10.213.111.166]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTP id 36PBmJPH008467; Tue, 25 Jul 2023 11:48:19 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 3994820) id D386C3434; Tue, 25 Jul 2023 17:18:18 +0530 (+0530) From: Vijaya Krishna Nivarthi To: agross@kernel.org, andersson@kernel.org, konrad.dybcio@linaro.org, broonie@kernel.org, linux-arm-msm@vger.kernel.org, linux-spi@vger.kernel.org, linux-kernel@vger.kernel.org Cc: quic_msavaliy@quicinc.com, dianders@chromium.org, mka@chromium.org, swboyd@chromium.org, quic_vtanuku@quicinc.com, dan.carpenter@linaro.org, Vijaya Krishna Nivarthi Subject: [PATCH 3/4] spi: spi-qcom-qspi: Call dma_wmb() after setting up descriptors Date: Tue, 25 Jul 2023 17:18:08 +0530 Message-Id: <1690285689-30233-4-git-send-email-quic_vnivarth@quicinc.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1690285689-30233-1-git-send-email-quic_vnivarth@quicinc.com> References: <1690285689-30233-1-git-send-email-quic_vnivarth@quicinc.com> X-QCInternal: smtphost X-QCInternal: smtphost X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-Virus-Version: vendor=nai engine=6200 definitions=5800 signatures=585085 X-Proofpoint-ORIG-GUID: gM2cr2YF-Bc1Y3t5_xnulY8HwPepCVfj X-Proofpoint-GUID: gM2cr2YF-Bc1Y3t5_xnulY8HwPepCVfj X-Proofpoint-Virus-Version: vendor=baseguard engine=ICAP:2.0.254,Aquarius:18.0.957,Hydra:6.0.591,FMLib:17.11.176.26 definitions=2023-07-25_06,2023-07-25_01,2023-05-22_02 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 malwarescore=0 phishscore=0 impostorscore=0 mlxscore=0 mlxlogscore=729 adultscore=0 priorityscore=1501 clxscore=1015 spamscore=0 suspectscore=0 bulkscore=0 lowpriorityscore=0 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2306200000 definitions=main-2307250103 Precedence: bulk List-ID: X-Mailing-List: linux-spi@vger.kernel.org After setting up dma descriptors and before initiaiting dma transfer, call dma_wmb() to ensure all writes go through. This doesn't fix any reported problem but is added for safety. Signed-off-by: Vijaya Krishna Nivarthi Reviewed-by: Douglas Anderson --- drivers/spi/spi-qcom-qspi.c | 4 +++- 1 file changed, 3 insertions(+), 1 deletion(-) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index b938908..d75234d 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -443,8 +443,10 @@ static int qcom_qspi_transfer_one(struct spi_master *master, ret = qcom_qspi_setup_dma_desc(ctrl, xfer); if (ret != -EAGAIN) { - if (!ret) + if (!ret) { + dma_wmb(); qcom_qspi_dma_xfer(ctrl); + } goto exit; } dev_warn_once(ctrl->dev, "DMA failure, falling back to PIO\n");