From mboxrd@z Thu Jan 1 00:00:00 1970 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=-20.4 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,DKIM_VALID_AU,INCLUDES_CR_TRAILER,INCLUDES_PATCH, MAILING_LIST_MULTI,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED,USER_AGENT_GIT autolearn=unavailable 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 9E964C07E95 for ; Sun, 4 Jul 2021 23:20:03 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 8732361378 for ; Sun, 4 Jul 2021 23:20:03 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S230205AbhGDXWi (ORCPT ); Sun, 4 Jul 2021 19:22:38 -0400 Received: from mail.kernel.org ([198.145.29.99]:57108 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S233759AbhGDXOj (ORCPT ); Sun, 4 Jul 2021 19:14:39 -0400 Received: by mail.kernel.org (Postfix) with ESMTPSA id 7D2C86198C; Sun, 4 Jul 2021 23:10:22 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1625440223; bh=yZeK2PHdhWLxEJf19CVm0B48b2I+k0hbQWpLDwrWCfk=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=FEOs4AETfexYncBvBR5Gpy4aNSEMv9cxT5PEx3gylywm7kwiIvgD87clCqTbMDu6h 3TNF5KN6g0/QIrTPgQTaZSjSN/mzgNyesFdIfRzaQpHldJIYVWYQcxI3iCsyc/bvT1 3k1ysa9huB7HBoEW1FoVFqr/Naj17BNcWj2yT1lT54XmoxKQeoYrVSnmOvaLuO6ZKI OUMoBFTvOcn2GYrV9ihXMsZN09pO5C52515k8UFc8TTe6XabL7TGjwzJoSa0DzSgOn 0b0TTCJsmD1+bqOKvib1tDD+H9hsuevZtLF0Qr8Gw4zNaA/DFJ7pQ/PED2oEMgUEkz SpVcKaf91McGw== From: Sasha Levin To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Steve Longerbeam , Fabio Estevam , Tim Harvey , Hans Verkuil , Mauro Carvalho Chehab , Sasha Levin , linux-media@vger.kernel.org, linux-staging@lists.linux.dev, linux-arm-kernel@lists.infradead.org Subject: [PATCH AUTOSEL 5.4 35/50] media: imx-csi: Skip first few frames from a BT.656 source Date: Sun, 4 Jul 2021 19:09:23 -0400 Message-Id: <20210704230938.1490742-35-sashal@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20210704230938.1490742-1-sashal@kernel.org> References: <20210704230938.1490742-1-sashal@kernel.org> MIME-Version: 1.0 X-stable: review X-Patchwork-Hint: Ignore Content-Transfer-Encoding: 8bit Precedence: bulk List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Steve Longerbeam [ Upstream commit e198be37e52551bb863d07d2edc535d0932a3c4f ] 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. [fabio: fixed checkpatch warning and increased the frame skipping to 20] Signed-off-by: Steve Longerbeam Signed-off-by: Fabio Estevam Reviewed-by: Tim Harvey Signed-off-by: Hans Verkuil Signed-off-by: Mauro Carvalho Chehab Signed-off-by: Sasha Levin --- 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 367e39f5b382..40b7e60f4a47 100644 --- a/drivers/staging/media/imx/imx-media-csi.c +++ b/drivers/staging/media/imx/imx-media-csi.c @@ -753,9 +753,10 @@ 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 */ @@ -764,6 +765,17 @@ 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) -- 2.30.2