From patchwork Wed Oct 7 16:14:50 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Hugues FRUCHET X-Patchwork-Id: 268293 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-12.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID, DKIM_VALID_AU, HEADER_FROM_DIFFERENT_DOMAINS, INCLUDES_PATCH, MAILING_LIST_MULTI, SIGNED_OFF_BY, SPF_HELO_NONE, SPF_PASS, URIBL_BLOCKED, USER_AGENT_GIT autolearn=ham autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 7CE31C41604 for ; Wed, 7 Oct 2020 16:15:13 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 1C67E2177B for ; Wed, 7 Oct 2020 16:15:12 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=pass (2048-bit key) header.d=st.com header.i=@st.com header.b="KTJQQCyZ" Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1729106AbgJGQPL (ORCPT ); Wed, 7 Oct 2020 12:15:11 -0400 Received: from mx08-00178001.pphosted.com ([91.207.212.93]:51910 "EHLO mx07-00178001.pphosted.com" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1727335AbgJGQPL (ORCPT ); Wed, 7 Oct 2020 12:15:11 -0400 Received: from pps.filterd (m0046661.ppops.net [127.0.0.1]) by mx07-00178001.pphosted.com (8.16.0.42/8.16.0.42) with SMTP id 097GBuj7001145; Wed, 7 Oct 2020 18:15:02 +0200 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=st.com; h=from : to : cc : subject : date : message-id : mime-version : content-type; s=STMicroelectronics; bh=FrR4z8DFk1Yt0/WCgIrxlpv+ajzjWbHMtoRqo/WihN4=; b=KTJQQCyZqPfWIGMgAZBfpUBFqilJwkcJNR9naG/YhFtLUTr1ToAk2izpHPXHnDkOQjEz oE6CwJ/tci9zPCchp7amfiWVNeYyHszzlYR4pZhEs8K5vEBSgmRRmIST+a/7vN01BZxW NPoncmJ6mFa1xHLKNEUk8LnlJEjtzwfuMEQIBgcxwNsJ4bGZuNtUOKQBpLmUfhDIBjcL 3AKjsZ+YgmXCJV/L0e11YCgSZuNAK0hKEKNigu5y+GscY7UmH162n8mYrCiTBqa1pEnU AP8gN8sCEDNZtRS280smKBAB1m2+DwgXO/bnkIHnfgsvcTQwxpbPB/0igMTtVsTNvvk6 QA== Received: from beta.dmz-eu.st.com (beta.dmz-eu.st.com [164.129.1.35]) by mx07-00178001.pphosted.com with ESMTP id 3402tk5w33-1 (version=TLSv1.2 cipher=ECDHE-RSA-AES256-GCM-SHA384 bits=256 verify=NOT); Wed, 07 Oct 2020 18:15:02 +0200 Received: from euls16034.sgp.st.com (euls16034.sgp.st.com [10.75.44.20]) by beta.dmz-eu.st.com (STMicroelectronics) with ESMTP id 872EB10002A; Wed, 7 Oct 2020 18:15:01 +0200 (CEST) Received: from Webmail-eu.st.com (sfhdag1node1.st.com [10.75.127.1]) by euls16034.sgp.st.com (STMicroelectronics) with ESMTP id 7358B2BE220; Wed, 7 Oct 2020 18:15:01 +0200 (CEST) Received: from localhost (10.75.127.46) by SFHDAG1NODE1.st.com (10.75.127.1) with Microsoft SMTP Server (TLS) id 15.0.1473.3; Wed, 7 Oct 2020 18:15:01 +0200 From: Hugues Fruchet To: Alexandre Torgue , Mauro Carvalho Chehab , Hans Verkuil CC: , , , , Alain Volmat , Yannick Fertre , Philippe CORNU , Hugues Fruchet Subject: [PATCH] media: stm32-dcmi: add support of BT656 bus Date: Wed, 7 Oct 2020 18:14:50 +0200 Message-ID: <1602087290-18020-1-git-send-email-hugues.fruchet@st.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.75.127.46] X-ClientProxiedBy: SFHDAG3NODE3.st.com (10.75.127.9) To SFHDAG1NODE1.st.com (10.75.127.1) X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-10-07_10:2020-10-06,2020-10-07 signatures=0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org Add support of BT656 embedded synchronization bus. This mode allows to save hardware synchro lines hsync & vsync by replacing them with synchro codes embedded in data stream. This bus type is only compatible with 8 bits width data bus. Due to reserved values 0x00 & 0xff used for synchro codes, valid data only vary from 0x1 to 0xfe, this is up to sensor to clip accordingly pixel data. As a consequence of this clipping, JPEG is not supported when using this bus type. DCMI crop feature is also not available with this bus type. Signed-off-by: Hugues Fruchet --- drivers/media/platform/stm32/stm32-dcmi.c | 37 +++++++++++++++++++++++++++++-- 1 file changed, 35 insertions(+), 2 deletions(-) diff --git a/drivers/media/platform/stm32/stm32-dcmi.c b/drivers/media/platform/stm32/stm32-dcmi.c index fd1c41c..d7d7cdb 100644 --- a/drivers/media/platform/stm32/stm32-dcmi.c +++ b/drivers/media/platform/stm32/stm32-dcmi.c @@ -157,6 +157,7 @@ struct stm32_dcmi { struct vb2_queue queue; struct v4l2_fwnode_bus_parallel bus; + enum v4l2_mbus_type bus_type; struct completion complete; struct clk *mclk; enum state state; @@ -777,6 +778,23 @@ static int dcmi_start_streaming(struct vb2_queue *vq, unsigned int count) if (dcmi->bus.flags & V4L2_MBUS_PCLK_SAMPLE_RISING) val |= CR_PCKPOL; + /* + * BT656 embedded synchronisation bus mode. + * + * Default SAV/EAV mode is supported here with default codes + * SAV=0xff000080 & EAV=0xff00009d. + * With DCMI this means LSC=SAV=0x80 & LEC=EAV=0x9d. + */ + if (dcmi->bus_type == V4L2_MBUS_BT656) { + val |= CR_ESS; + + /* Unmask all codes */ + reg_write(dcmi->regs, DCMI_ESUR, 0xffffffff);/* FEC:LEC:LSC:FSC */ + + /* Trig on LSC=0x80 & LEC=0x9d codes, ignore FSC and FEC */ + reg_write(dcmi->regs, DCMI_ESCR, 0xff9d80ff);/* FEC:LEC:LSC:FSC */ + } + reg_write(dcmi->regs, DCMI_CR, val); /* Set crop */ @@ -1067,8 +1085,9 @@ static int dcmi_set_fmt(struct stm32_dcmi *dcmi, struct v4l2_format *f) if (ret) return ret; - /* Disable crop if JPEG is requested */ - if (pix->pixelformat == V4L2_PIX_FMT_JPEG) + /* Disable crop if JPEG is requested or BT656 bus is selected */ + if (pix->pixelformat == V4L2_PIX_FMT_JPEG && + dcmi->bus_type != V4L2_MBUS_BT656) dcmi->do_crop = false; /* pix to mbus format */ @@ -1592,6 +1611,11 @@ static int dcmi_formats_init(struct stm32_dcmi *dcmi) if (dcmi_formats[i].mbus_code != mbus_code.code) continue; + /* Exclude JPEG if BT656 bus is selected */ + if (dcmi_formats[i].fourcc == V4L2_PIX_FMT_JPEG && + dcmi->bus_type == V4L2_MBUS_BT656) + continue; + /* Code supported, have we got this fourcc yet? */ for (j = 0; j < num_fmts; j++) if (sd_fmts[j]->fourcc == @@ -1873,9 +1897,18 @@ static int dcmi_probe(struct platform_device *pdev) dev_err(&pdev->dev, "CSI bus not supported\n"); return -ENODEV; } + + if (ep.bus_type == V4L2_MBUS_BT656 && + ep.bus.parallel.bus_width != 8) { + dev_err(&pdev->dev, "BT656 bus conflicts with %d bits bus width (8 bits required)\n", + ep.bus.parallel.bus_width); + return -ENODEV; + } + dcmi->bus.flags = ep.bus.parallel.flags; dcmi->bus.bus_width = ep.bus.parallel.bus_width; dcmi->bus.data_shift = ep.bus.parallel.data_shift; + dcmi->bus_type = ep.bus_type; irq = platform_get_irq(pdev, 0); if (irq <= 0)