From patchwork Tue Jul 25 11:48:06 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: 706556 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 8520FC001E0 for ; Tue, 25 Jul 2023 11:48:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232220AbjGYLsj (ORCPT ); Tue, 25 Jul 2023 07:48:39 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:56008 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S235128AbjGYLsZ (ORCPT ); Tue, 25 Jul 2023 07:48:25 -0400 Received: from mx0b-0031df01.pphosted.com (mx0b-0031df01.pphosted.com [205.220.180.131]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 868FA10E3; Tue, 25 Jul 2023 04:48:24 -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 36PAVCh6024633; Tue, 25 Jul 2023 11:48:20 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=Y8buMMzhQ7FtSPdJ2/drbMy2Q2nEihK3vxgah9dupxs=; b=hkHCdqjnspq/GdYZCqNQ9aVpD4kz5JCSt+zXwexp2MegcVRo5Rm9uCeUYGpxr+8RonVb /8duf56r6CGvhyGdvy4QIpOzPgP6deXEuPWJMUexIbEhLmzSyybzS6Su2OHHw9xoLAKq KI2jmWBcW2qBTxjLz2udOQsihILwwe8E6ZHSUQMfrjh8Tx29i7bGNAiznWMG+y2nEr0W rUKmURbZQRWAAWgzj/VqoEaWVPT3HplaRfUY9nM1gVglX8v+5bpOeLp4j6s1gqNgf0SF z7qjzF/Kei2LQXYnVtOnR4gQMw43jahXiYvHkJT3wFcPU1OwPW93MvemN5yqgcO+Q6Ao PQ== 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 3s1qastu83-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Tue, 25 Jul 2023 11:48:20 +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 36PBmHpj008447; Tue, 25 Jul 2023 11:48:17 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 3s086kv0y7-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 25 Jul 2023 11:48:17 +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 36PBmGgU008439; Tue, 25 Jul 2023 11:48:16 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 36PBmG9F008437; Tue, 25 Jul 2023 11:48:16 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 3994820) id EE50A3434; Tue, 25 Jul 2023 17:18:15 +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 1/4] spi: spi-qcom-qspi: Ignore disabled interrupts' status in isr Date: Tue, 25 Jul 2023 17:18:06 +0530 Message-Id: <1690285689-30233-2-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: J95l_wAvZ-t56Eurjd4jWKpSBQFejlIy X-Proofpoint-GUID: J95l_wAvZ-t56Eurjd4jWKpSBQFejlIy 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=258 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 During FIFO/DMA modes dynamic switching, only corresponding interrupts are enabled. However its possible that FIFO related interrupt status registers get set during DMA mode. For example WR_FIFO_EMPTY bit is set during DMA TX. Ignore such status bits so that they don't trip unwanted operations. Suggested-by: Douglas Anderson Signed-off-by: Vijaya Krishna Nivarthi --- drivers/spi/spi-qcom-qspi.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index a0ad980..b995542 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -603,6 +603,9 @@ static irqreturn_t qcom_qspi_irq(int irq, void *dev_id) int_status = readl(ctrl->base + MSTR_INT_STATUS); writel(int_status, ctrl->base + MSTR_INT_STATUS); + /* Ignore disabled interrupts */ + int_status &= readl(ctrl->base + MSTR_INT_EN); + /* PIO mode handling */ if (ctrl->xfer.dir == QSPI_WRITE) { if (int_status & WR_FIFO_EMPTY) From patchwork Tue Jul 25 11:48:07 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: 708263 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 7A187C04E69 for ; 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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 36PBmJ5F008462; Tue, 25 Jul 2023 11:48:19 GMT Received: from pps.reinject (localhost [127.0.0.1]) by APBLRPPMTA01.qualcomm.com (PPS) with ESMTPS id 3s086kv0ye-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NO); Tue, 25 Jul 2023 11:48:19 +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 36PBmGgW008439; Tue, 25 Jul 2023 11:48:18 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 36PBmIwi008452; Tue, 25 Jul 2023 11:48:18 +0000 Received: by hu-sgudaval-hyd.qualcomm.com (Postfix, from userid 3994820) id A4A0A3434; Tue, 25 Jul 2023 17:18:17 +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 2/4] spi: spi-qcom-qspi: Use GFP_ATOMIC flag while allocating for descriptor Date: Tue, 25 Jul 2023 17:18:07 +0530 Message-Id: <1690285689-30233-3-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-GUID: pG_7Nw6ndLAkMfrzn6JktmmFzHT9TSgt X-Proofpoint-ORIG-GUID: pG_7Nw6ndLAkMfrzn6JktmmFzHT9TSgt 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 mlxscore=0 mlxlogscore=692 bulkscore=0 adultscore=0 lowpriorityscore=0 priorityscore=1501 phishscore=0 suspectscore=0 clxscore=1015 spamscore=0 malwarescore=0 impostorscore=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 While allocating for DMA descriptor, GFP_KERNEL flag is being used and this allocation happens within critical section with spinlock acquired. This generates a static checker warning. Use GFP_ATOMIC to prevent sleeping; and since this increases chances of allocation failure, add handling accordingly. Reported-by: Dan Carpenter Closes: https://lore.kernel.org/all/abc223e8-44af-40bb-a0bd-9865b393f435@moroto.mountain/ Signed-off-by: Vijaya Krishna Nivarthi --- drivers/spi/spi-qcom-qspi.c | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index b995542..b938908 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -308,9 +308,11 @@ static int qcom_qspi_alloc_desc(struct qcom_qspi *ctrl, dma_addr_t dma_ptr, dma_addr_t dma_cmd_desc; /* allocate for dma cmd descriptor */ - virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_KERNEL | __GFP_ZERO, &dma_cmd_desc); - if (!virt_cmd_desc) - return -ENOMEM; + virt_cmd_desc = dma_pool_alloc(ctrl->dma_cmd_pool, GFP_ATOMIC | __GFP_ZERO, &dma_cmd_desc); + if (!virt_cmd_desc) { + dev_warn_once(ctrl->dev, "Couldn't find memory for descriptor\n"); + return -EAGAIN; + } ctrl->virt_cmd_desc[ctrl->n_cmd_desc] = virt_cmd_desc; ctrl->dma_cmd_desc[ctrl->n_cmd_desc] = dma_cmd_desc; 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: 706557 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; 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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 --- 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"); From patchwork Tue Jul 25 11:48:09 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: 706555 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 2BD77C05051 for ; 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Signed-off-by: Vijaya Krishna Nivarthi Reviewed-by: Douglas Anderson --- drivers/spi/spi-qcom-qspi.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/drivers/spi/spi-qcom-qspi.c b/drivers/spi/spi-qcom-qspi.c index d75234d..b56cb16 100644 --- a/drivers/spi/spi-qcom-qspi.c +++ b/drivers/spi/spi-qcom-qspi.c @@ -69,7 +69,7 @@ WR_FIFO_OVERRUN) #define QSPI_ALL_IRQS (QSPI_ERR_IRQS | RESP_FIFO_RDY | \ WR_FIFO_EMPTY | WR_FIFO_FULL | \ - TRANSACTION_DONE) + TRANSACTION_DONE | DMA_CHAIN_DONE) #define PIO_XFER_CTRL 0x0014 #define REQUEST_COUNT_MSK 0xffff