From patchwork Tue Apr 27 14:05:35 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Fabio Estevam X-Patchwork-Id: 428099 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=-15.8 required=3.0 tests=BAYES_00,DKIM_SIGNED, DKIM_VALID,DKIM_VALID_AU,FREEMAIL_FORGED_FROMDOMAIN,FREEMAIL_FROM, HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI, SPF_HELO_NONE, SPF_PASS, 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 9B8C6C433B4 for ; Tue, 27 Apr 2021 14:05:50 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 751C56101B for ; Tue, 27 Apr 2021 14:05:50 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S236269AbhD0OGc (ORCPT ); Tue, 27 Apr 2021 10:06:32 -0400 Received: from lindbergh.monkeyblade.net ([23.128.96.19]:49552 "EHLO lindbergh.monkeyblade.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S236074AbhD0OGb (ORCPT ); Tue, 27 Apr 2021 10:06:31 -0400 Received: from mail-qk1-x72c.google.com (mail-qk1-x72c.google.com [IPv6:2607:f8b0:4864:20::72c]) by lindbergh.monkeyblade.net (Postfix) with ESMTPS id 3C9FAC061574 for ; Tue, 27 Apr 2021 07:05:47 -0700 (PDT) Received: by mail-qk1-x72c.google.com with SMTP id o5so60046819qkb.0 for ; Tue, 27 Apr 2021 07:05:47 -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=MNOgrskzgSHiZ308twmTts1ZnjtIruP3xMzmz0Vi210=; b=H2MolgjL+VBAn1bSMHgevFZJm48ixkhKG/Up+B0C6qR+jqyUDqo2QvuVOSFLQnCdwU +GfRbx9ZebvyjuQz71xbzUcQ2rHuQWRUhn8ojw+hMClv+Ww8Z6XucX5es1n4czlgIzXt 1UvxF83R7PGiMtlDmjOFuVinWqoQ2uIDe+hvm1e9DN5Q7RC0jt/CJgnKPHoRAcA2Kg5I d1w0V9TH/SJNErrjhz29z+Ih3c8CQ/vCSdp1I66MkX/IRC+UM9+AF8TwdQSqCt23iy6n Q24kU9ey9yUlJD6dwTEWf4FltS63at4pOh5J06ehRrbOLvxTyh0o+1yNSCbTQetFkOR0 8esg== 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=MNOgrskzgSHiZ308twmTts1ZnjtIruP3xMzmz0Vi210=; b=B7js9p717pvLZsj9CSlrXF5a1DqHcsE7niqr4FHl0flqzmq2qu1dsUnFn9n/DfrXka C9nfRLCe88eOiRu1gXsBpz+020JJSeDcuX+A6p3+qKlGX6Y7TcirZR8y9b2KZDgvMcgn RgXkUcPMJclRchfnp+P9QdYHmejhlQpqHYoAYQLv87qnLhYhivwwoQBfieXi6JAUDJWX Bqxbbs8azWQZbxXDUDTt7fS8ZDAgGIxMcLs6M8w7wr8G0kXWxyKu/USYuJPUVmYIsPJ/ WS+AcRSBLwkN8GKWc9q92TDiB8hTJ/bgOTZ4WpTfOhy5kfRnpDdqmdWXilRjujXjSg+U 2zfg== X-Gm-Message-State: AOAM53166IzN0nwfCXD/i996i8Ed9O/gy56JnzkgEzAtOmwipnMmRc12 4cQ7V+ERRliAmLHU9hwrPz0= X-Google-Smtp-Source: ABdhPJwBP5JNT6RigylhEKrKzGXD896h/o4GJ/1cOmUPR/nq2imp5X6dE5uAz5uBawE4HjV5wTu8tw== X-Received: by 2002:a05:620a:15c7:: with SMTP id o7mr9743308qkm.102.1619532345726; Tue, 27 Apr 2021 07:05:45 -0700 (PDT) Received: from localhost.localdomain ([2804:14c:482:919:dc3c:c8fa:5d17:d49e]) by smtp.gmail.com with ESMTPSA id t18sm2797653qkj.75.2021.04.27.07.05.43 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Tue, 27 Apr 2021 07:05:45 -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] media: imx-csi: Skip first few frames from a BT.656 source Date: Tue, 27 Apr 2021 11:05:35 -0300 Message-Id: <20210427140535.3107582-1-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 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 10 frames to avoid the unstable sync codes. Signed-off-by: Steve Longerbeam [fabio: fixed checkpatch warning] Signed-off-by: Fabio Estevam --- 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..5d24dd1379b3 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 = 10; + + 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)