From patchwork Fri May 10 15:30:40 2019 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Michael Rodin X-Patchwork-Id: 10939041 Return-Path: Received: from mail.wl.linuxfoundation.org (pdx-wl-mail.web.codeaurora.org [172.30.200.125]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id 65B9576 for ; Fri, 10 May 2019 15:31:02 +0000 (UTC) Received: from mail.wl.linuxfoundation.org (localhost [127.0.0.1]) by mail.wl.linuxfoundation.org (Postfix) with ESMTP id 5687E28B0C for ; Fri, 10 May 2019 15:31:02 +0000 (UTC) Received: by mail.wl.linuxfoundation.org (Postfix, from userid 486) id 4AE9128C5D; Fri, 10 May 2019 15:31:02 +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=-7.9 required=2.0 tests=BAYES_00,MAILING_LIST_MULTI, RCVD_IN_DNSWL_HI autolearn=ham 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 DE7DE28C01 for ; Fri, 10 May 2019 15:31:01 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1727459AbfEJPa4 (ORCPT ); Fri, 10 May 2019 11:30:56 -0400 Received: from smtp1.de.adit-jv.com ([93.241.18.167]:54416 "EHLO smtp1.de.adit-jv.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1727144AbfEJPa4 (ORCPT ); Fri, 10 May 2019 11:30:56 -0400 Received: from localhost (smtp1.de.adit-jv.com [127.0.0.1]) by smtp1.de.adit-jv.com (Postfix) with ESMTP id A1AC63C00D1; Fri, 10 May 2019 17:30:54 +0200 (CEST) Received: from smtp1.de.adit-jv.com ([127.0.0.1]) by localhost (smtp1.de.adit-jv.com [127.0.0.1]) (amavisd-new, port 10024) with ESMTP id 9nHt6qMwHxly; Fri, 10 May 2019 17:30:47 +0200 (CEST) Received: from HI2EXCH01.adit-jv.com (hi2exch01.adit-jv.com [10.72.92.24]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-SHA384 (256/256 bits)) (No client certificate requested) by smtp1.de.adit-jv.com (Postfix) with ESMTPS id 91B4A3C004C; Fri, 10 May 2019 17:30:47 +0200 (CEST) Received: from vmlxhi-121.adit-jv.com (10.72.93.65) by HI2EXCH01.adit-jv.com (10.72.92.24) with Microsoft SMTP Server (TLS) id 14.3.439.0; Fri, 10 May 2019 17:30:47 +0200 From: Michael Rodin To: , , CC: , , Subject: [PATCH] media: i2c: adv748x: initialize bit 7 of csi_tx_top_reg_1f Date: Fri, 10 May 2019 17:30:40 +0200 Message-ID: <1557502240-16274-1-git-send-email-mrodin@de.adit-jv.com> X-Mailer: git-send-email 2.7.4 MIME-Version: 1.0 X-Originating-IP: [10.72.93.65] 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 According to pages 188 and 193 of the "UG-747: ADV7481 Reference Manual" [1], the bit 7 (FRAMENUMBER_INTERLACED) of the register csi_tx_top_reg_1f "sets association of frame number in the FS and FE packets with the F bit in the EAV/SAV codes". EAV/SAV codes are defined in [2]. According to [2]: F=0 for field 1 F=1 for field 2 The bit FRAMENUMBER_INTERLACED is not initialized anywhere in the current version of the adv748x driver and therefore it is always 0, which is the default value according to [1]. Therefore the current association of field number from EAV/SAV code with the frame number in CSI FS and FE packets is: field 1 (top field for PAL, bottom field for NTSC) -> CSI frame number 2 field 2 (bottom field for PAL, top field for NTSC) -> CSI frame number 1 But this breaks frame number based field detection of top/bottom fields in CSI receivers. Therefore it makes sense to initialize the FRAMENUMBER_INTERLACED bit to 1 so the association is as expected: field 1 -> frame number 1 field 2 -> frame number 2 [1] https://www.analog.com/en/products/adv7481.html [2] https://www.itu.int/rec/R-REC-BT.656-5-200712-I/en Suggested-by: Steve Longerbeam Signed-off-by: Michael Rodin --- drivers/media/i2c/adv748x/adv748x-core.c | 3 +++ 1 file changed, 3 insertions(+) diff --git a/drivers/media/i2c/adv748x/adv748x-core.c b/drivers/media/i2c/adv748x/adv748x-core.c index f57cd77..4dd1a13 100644 --- a/drivers/media/i2c/adv748x/adv748x-core.c +++ b/drivers/media/i2c/adv748x/adv748x-core.c @@ -278,6 +278,9 @@ static int adv748x_power_up_tx(struct adv748x_csi2 *tx) usleep_range(1000, 1500); adv748x_write_check(state, page, 0x31, 0x80, &ret); + /* set bit 7 (FRAMENUMBER_INTERLACED) in csi_tx_top_reg_1f */ + adv748x_write_check(state, page, 0x1f, 0x80, &ret); + return ret; }