From patchwork Mon May 17 14:29:23 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 74324 X-Patchwork-Delegate: hverkuil@xs4all.nl Received: from vger.kernel.org ([23.128.96.18]) by www.linuxtv.org with esmtp (Exim 4.92) (envelope-from ) id 1lif4c-007c4X-4O; Mon, 17 May 2021 15:22:26 +0000 Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236366AbhEQPXf (ORCPT + 1 other); Mon, 17 May 2021 11:23:35 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:52164 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S244424AbhEQPUj (ORCPT ); Mon, 17 May 2021 11:20:39 -0400 Received: from mail-qt1-x82d.google.com (mail-qt1-x82d.google.com [IPv6:2607:f8b0:4864:20::82d]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 01F66C0610E3 for ; Mon, 17 May 2021 07:29:39 -0700 (PDT) Received: by mail-qt1-x82d.google.com with SMTP id j19so4941142qtp.7 for ; Mon, 17 May 2021 07:29:38 -0700 (PDT) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=fHCHTlP3//K978EvY7rwF4tuW8ieWnf/K366gEOonds=; b=Y0RzLQXC0TAqeZkyAXC92ZZwUs24j282EVieboVyU38BlaPEsyN8ynkeJCsapNHiPS xEFrwsAR4lW7tQRHHfgYTGEWH7YHG7GRISe7BMcQ5QnyhftJeI1uxWSMBOcUmSK9MYwH O4XtE7LLmHl3jKc0jpSYZKHnXFgBiAtNyca3wR7ShLP8t35Xy3tOB6bEAtGkVrQ4Xk79 L4BklvBhf7UAZ914GeH0i/fgN55Wi+co6UMEB+iHaC1Y0JrFg9/gHl1bnwFmdcoNw2ly TlG+t/Z3XQ8cBkCROy3Bk70woFr35MIKtLeNQaoovrr2rqNrPOUkV2rZmonYxgn2LKVy Q0YQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:from:to:cc:subject:date:message-id:mime-version :content-transfer-encoding; bh=fHCHTlP3//K978EvY7rwF4tuW8ieWnf/K366gEOonds=; b=QRz5jpVVcLmkP6sEsm4BDlTiHv8++3D3WJNbA+4GkWRefqNBqLjGe2ytjtiMw60woq 4J52FdB+mIb96/jCb5FmyEuTkbXUlWX70uZpfLwVlrL5s1nntPKSgjLD5a8rwmN+RRaJ Pk7Gr3u3Kk9qH9eTTEpX4Zfhusp3/pGu5tNhemH5pd/92/tHkm00AUR+k6QLpYd8GG5K Q8e64Dve/8ZTekd+b5ZQj2HkVuvOVMQtKe4Ok2NUiXXXJJmbIsLUIUQ7QjEmt7HptMy+ lVv+fTLofmsxj8JemtD6NXAwnqdcy7+bPM7FR7Lrr056QKxMKEuL9dawPZPn58evVfVA XULQ== X-Gm-Message-State: AOAM530wbF+8TZk1YYK3YjRvdSO+NUT8WNsC2Ny3GsHfJsEzBjRO0d3f KSqbBgTQ6QEiySY6qIzIO6w= X-Google-Smtp-Source: ABdhPJyXGsiVOpLBOY9RRgPMa6Vnr1y3+C3osJVrDq85CUHKaoTxd+ktn9RkUWWDHA5nlbLJwnYDwQ== X-Received: by 2002:ac8:7442:: with SMTP id h2mr51137656qtr.315.1621261778206; Mon, 17 May 2021 07:29:38 -0700 (PDT) Received: from localhost.localdomain ([2804:14c:482:919:7569:d958:c12:8892]) by smtp.gmail.com with ESMTPSA id h65sm10591449qkd.112.2021.05.17.07.29.35 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Mon, 17 May 2021 07:29:37 -0700 (PDT) From: Fabio Estevam To: hverkuil-cisco@xs4all.nl Cc: slongerbeam@gmail.com, p.zabel@pengutronix.de, frieder.schrempf@kontron.de, tharvey@gateworks.com, linux-media@vger.kernel.org, Fabio Estevam Subject: [PATCH v3] media: imx-csi: Skip first few frames from a BT.656 source Date: Mon, 17 May 2021 11:29:23 -0300 Message-Id: <20210517142923.3173431-1-festevam@gmail.com> X-Mailer: git-send-email 2.25.1 MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org X-LSpam-Score: -3.2 (---) X-LSpam-Report: No, score=-3.2 required=5.0 tests=BAYES_00=-1.9,DKIM_SIGNED=0.1,DKIM_VALID=-0.1,DKIM_VALID_AU=-0.1,FREEMAIL_FORGED_FROMDOMAIN=0.001,FREEMAIL_FROM=0.001,HEADER_FROM_DIFFERENT_DOMAINS=0.5,MAILING_LIST_MULTI=-1,RCVD_IN_DNSWL_LOW=-0.7 autolearn=ham autolearn_force=no From: Steve Longerbeam Some BT.656 sensors (e.g. ADV718x) transmit frames with unstable BT.656 sync codes after initial power on. This confuses the imx CSI,resulting in vertical and/or horizontal sync issues. Skip the first 20 frames to avoid the unstable sync codes. Signed-off-by: Steve Longerbeam [fabio: fixed checkpatch warning and increased the frame skipping to 20] Signed-off-by: Fabio Estevam Reviewed-By: Tim Harvey --- Changes since v2: - Increase 'bad_frames' to 20 as 10 was not enough to avoid the problem when using an NTSC camera. drivers/staging/media/imx/imx-media-csi.c | 14 +++++++++++++- 1 file changed, 13 insertions(+), 1 deletion(-) diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c index e3bfd635a89a..6a94fff49bf6 100644 --- a/drivers/staging/media/imx/imx-media-csi.c +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -750,9 +750,10 @@ static int csi_setup(struct csi_priv *priv) static int csi_start(struct csi_priv *priv) { - struct v4l2_fract *output_fi; + struct v4l2_fract *input_fi, *output_fi; int ret; + input_fi = &priv->frame_interval[CSI_SINK_PAD]; output_fi = &priv->frame_interval[priv->active_output_pad]; /* start upstream */ @@ -761,6 +762,17 @@ static int csi_start(struct csi_priv *priv) if (ret) return ret; + /* Skip first few frames from a BT.656 source */ + if (priv->upstream_ep.bus_type == V4L2_MBUS_BT656) { + u32 delay_usec, bad_frames = 20; + + delay_usec = DIV_ROUND_UP_ULL((u64)USEC_PER_SEC * + input_fi->numerator * bad_frames, + input_fi->denominator); + + usleep_range(delay_usec, delay_usec + 1000); + } + if (priv->dest == IPU_CSI_DEST_IDMAC) { ret = csi_idmac_start(priv); if (ret)