From patchwork Thu Feb 22 09:49:33 2018 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugues FRUCHET X-Patchwork-Id: 10234949 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork.web.codeaurora.org (Postfix) with ESMTP id D111C60349 for ; Thu, 22 Feb 2018 09:51:41 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id E036F28B02 for ; Thu, 22 Feb 2018 09:51:41 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id D4BA128B0A; Thu, 22 Feb 2018 09:51:41 +0000 (UTC) X-Spam-Checker-Version: SpamAssassin 3.3.1 (2010-03-16) on pdx-wl-mail.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-6.9 required=2.0 tests=BAYES_00,RCVD_IN_DNSWL_HI autolearn=unavailable version=3.3.1 Received: from vger.kernel.org (vger.kernel.org [209.132.180.67]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id BCD9628B02 for ; Thu, 22 Feb 2018 09:51:40 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753090AbeBVJvL (ORCPT ); Thu, 22 Feb 2018 04:51:11 -0500 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:44676 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1753198AbeBVJuQ (ORCPT ); Thu, 22 Feb 2018 04:50:16 -0500 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx08-.pphosted.com (8.16.0.21/8.16.0.21) with SMTP id w1M9moGI014094; Thu, 22 Feb 2018 10:49:38 +0100 Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx08-00178001.pphosted.com with ESMTP id 2g9bpk3nx2-1 (version=TLSv1 cipher=ECDHE-RSA-AES256-SHA bits=256 verify=NOT); Thu, 22 Feb 2018 10:49:38 +0100 Received: from zeta.dmz-eu.st.com (zeta.dmz-eu.st.com [164.129.230.9]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 602CD3A; Thu, 22 Feb 2018 09:49:36 +0000 (GMT) Received: from Webmail-eu.st.com (Safex1hubcas21.st.com [10.75.90.44]) by zeta.dmz-eu.st.com (STMicroelectronics) with ESMTP id C8EAD503E; Thu, 22 Feb 2018 09:49:36 +0000 (GMT) Received: from SAFEX1HUBCAS23.st.com (10.75.90.47) by SAFEX1HUBCAS21.st.com (10.75.90.44) with Microsoft SMTP Server (TLS) id 14.3.361.1; Thu, 22 Feb 2018 10:49:36 +0100 Received: from localhost (10.201.23.73) by webmail-ga.st.com (10.75.90.48) with Microsoft SMTP Server (TLS) id 14.3.361.1; Thu, 22 Feb 2018 10:49:36 +0100 From: Hugues Fruchet To: Maxime Coquelin , Alexandre Torgue , Mauro Carvalho Chehab , "Hans Verkuil" CC: , , , Benjamin Gaignard , Yannick Fertre , Hugues Fruchet Subject: [PATCH v2] media: stm32-dcmi: rework overrun/error case Date: Thu, 22 Feb 2018 10:49:33 +0100 Message-ID: <1519292973-19808-1-git-send-email-hugues.fruchet@st.com> X-Mailer: git-send-email 1.9.1 MIME-Version: 1.0 X-Originating-IP: [10.201.23.73] X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10432:, , definitions=2018-02-22_04:, , signatures=0 Sender: linux-media-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-Virus-Scanned: ClamAV using ClamSMTP Do not stop/restart dma on overrun or errors. Dma will be restarted on current frame transfer completion. Frame transfer completion is ensured even if overrun or error occurs by DCMI continuous capture mode which restarts data transfer at next frame sync. Do no warn on overrun while in irq thread, this slows down system and lead to more overrun errors. Use a counter instead and log errors at stop streaming. Signed-off-by: Hugues Fruchet --- version 2: - Minor: remove extra line at end of dcmi_stop_streaming() drivers/media/platform/stm32/stm32-dcmi.c | 29 +++++++++++------------------ 1 file changed, 11 insertions(+), 18 deletions(-) diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c index 5de18ad..536c0d5 100644 --- a/drivers/media/platform/stm32/stm32-dcmi.c +++ b/drivers/media/platform/stm32/stm32-dcmi.c @@ -160,6 +160,7 @@ struct stm32_dcmi { dma_cookie_t dma_cookie; u32 misr; int errors_count; + int overrun_count; int buffers_count; }; @@ -373,23 +374,9 @@ static irqreturn_t dcmi_irq_thread(int irq, void *arg) } if ((dcmi->misr & IT_OVR) || (dcmi->misr & IT_ERR)) { - /* - * An overflow or an error has been detected, - * stop current DMA transfert & restart it - */ - dev_warn(dcmi->dev, "%s: Overflow or error detected\n", - __func__); - dcmi->errors_count++; - dev_dbg(dcmi->dev, "Restarting capture after DCMI error\n"); - - spin_unlock_irq(&dcmi->irqlock); - dmaengine_terminate_all(dcmi->dma_chan); - - if (dcmi_start_capture(dcmi)) - dev_err(dcmi->dev, "%s: Cannot restart capture on overflow or error\n", - __func__); - return IRQ_HANDLED; + if (dcmi->misr & IT_OVR) + dcmi->overrun_count++; } spin_unlock_irq(&dcmi->irqlock); @@ -572,6 +559,7 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count) dcmi->sequence = 0; dcmi->errors_count = 0; + dcmi->overrun_count = 0; dcmi->buffers_count = 0; dcmi->active = NULL; @@ -682,8 +670,13 @@ static void dcmi_stop_streaming(struct vb2_queue *vq) clk_disable(dcmi->mclk); - dev_dbg(dcmi->dev, "Stop streaming, errors=%d buffers=%d\n", - dcmi->errors_count, dcmi->buffers_count); + if (dcmi->errors_count) + dev_warn(dcmi->dev, "Some errors found while streaming: errors=%d (overrun=%d), buffers=%d\n", + dcmi->errors_count, dcmi->overrun_count, + dcmi->buffers_count); + dev_dbg(dcmi->dev, "Stop streaming, errors=%d (overrun=%d), buffers=%d\n", + dcmi->errors_count, dcmi->overrun_count, + dcmi->buffers_count); } static const struct vb2_ops dcmi_video_qops = {