From patchwork Thu Dec 16 22:09:46 2021 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12682845 X-Patchwork-Delegate: kieran@bingham.xyz Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 73C65C4321E for ; Thu, 16 Dec 2021 22:09:59 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S241541AbhLPWJ6 (ORCPT ); Thu, 16 Dec 2021 17:09:58 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:45468 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S241421AbhLPWJ6 (ORCPT ); Thu, 16 Dec 2021 17:09:58 -0500 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id D37CD1265; Thu, 16 Dec 2021 23:09:55 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1639692596; bh=gJz8U5632ZU+fVSVsuBaOCiBZgyAUM/FAmhXYY3/A18=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=oDJeRPp0ktHdhf+TsEJ4thcejt3r+4wT6+p28ZYGaUxD6YQsNVHxS9PY7/lECN+tT ddztm+Jy2RYyIgoi5a13OYR9hYU00RQtH/JQiXebYG2wHdEIYP1f4ehYyLaPhuOfBV GD28JH+fMBnp4m4LIyJbNpaKJ6y7j0dkvQdXmxzI= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Jacopo Mondi , Kieran Bingham , =?utf-8?q?Niklas_?= =?utf-8?q?S=C3=B6derlund?= , Thomas Nizan , Laurent Pinchart Subject: [PATCH 3/3] media: i2c: max9286: Support manual framesync operation Date: Fri, 17 Dec 2021 00:09:46 +0200 Message-Id: <20211216220946.20771-4-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.32.0 In-Reply-To: <20211216220946.20771-1-laurent.pinchart+renesas@ideasonboard.com> References: <20211216220946.20771-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-renesas-soc@vger.kernel.org From: Laurent Pinchart The MAX9286 can generate a framesync signal to synchronize the cameras, using an internal timer. Support this mode of operation and configure it through the .s_frameinterval() operation. If the frame interval is not 0, framesync is switched to manual mode with the specified interval, otherwise automatic mode is used. Signed-off-by: Laurent Pinchart --- drivers/media/i2c/max9286.c | 66 +++++++++++++++++++++++++++++++++++-- 1 file changed, 63 insertions(+), 3 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index fa2f6a823fe6..dce1146635d2 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -174,6 +174,7 @@ struct max9286_priv { struct v4l2_ctrl *pixelrate; struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; + struct v4l2_fract interval; /* Protects controls and fmt structures */ struct mutex mutex; @@ -474,6 +475,37 @@ static int max9286_check_config_link(struct max9286_priv *priv, return 0; } +static void max9286_set_fsync_period(struct max9286_priv *priv) +{ + u32 fsync; + + if (!priv->interval.numerator || !priv->interval.denominator) { + /* + * Special case, a null interval enables automatic FRAMESYNC + * mode. FRAMESYNC is taken from the slowest link. + */ + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | + MAX9286_FSYNCMETH_AUTO); + return; + } + + /* + * Manual FRAMESYNC + * + * The FRAMESYNC generator is configured with a period expressed as a + * number of PCLK periods, which runs at 75MHz. + */ + fsync = div_u64(75000000ULL * priv->interval.numerator, + priv->interval.denominator); + + max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_OUT | + MAX9286_FSYNCMETH_MANUAL); + + max9286_write(priv, 0x06, (fsync >> 0) & 0xff); + max9286_write(priv, 0x07, (fsync >> 8) & 0xff); + max9286_write(priv, 0x08, (fsync >> 16) & 0xff); +} + /* ----------------------------------------------------------------------------- * V4L2 Subdev */ @@ -656,6 +688,8 @@ static int max9286_s_stream(struct v4l2_subdev *sd, int enable) int ret; if (enable) { + max9286_set_fsync_period(priv); + /* * The frame sync between cameras is transmitted across the * reverse channel as GPIO. We must open all channels while @@ -715,6 +749,32 @@ static int max9286_s_stream(struct v4l2_subdev *sd, int enable) return 0; } +static int max9286_g_frame_interval(struct v4l2_subdev *sd, + struct v4l2_subdev_frame_interval *interval) +{ + struct max9286_priv *priv = sd_to_max9286(sd); + + if (interval->pad == MAX9286_SRC_PAD) + return -EINVAL; + + interval->interval = priv->interval; + + return 0; +} + +static int max9286_s_frame_interval(struct v4l2_subdev *sd, + struct v4l2_subdev_frame_interval *interval) +{ + struct max9286_priv *priv = sd_to_max9286(sd); + + if (interval->pad == MAX9286_SRC_PAD) + return -EINVAL; + + priv->interval = interval->interval; + + return 0; +} + static int max9286_enum_mbus_code(struct v4l2_subdev *sd, struct v4l2_subdev_state *sd_state, struct v4l2_subdev_mbus_code_enum *code) @@ -806,6 +866,8 @@ static int max9286_get_fmt(struct v4l2_subdev *sd, static const struct v4l2_subdev_video_ops max9286_video_ops = { .s_stream = max9286_s_stream, + .g_frame_interval = max9286_g_frame_interval, + .s_frame_interval = max9286_s_frame_interval, }; static const struct v4l2_subdev_pad_ops max9286_pad_ops = { @@ -998,9 +1060,7 @@ static int max9286_setup(struct max9286_priv *priv) MAX9286_CSILANECNT(priv->csi2_data_lanes) | MAX9286_DATATYPE_YUV422_8BIT); - /* Automatic: FRAMESYNC taken from the slowest Link. */ - max9286_write(priv, 0x01, MAX9286_FSYNCMODE_INT_HIZ | - MAX9286_FSYNCMETH_AUTO); + max9286_set_fsync_period(priv); /* Enable HS/VS encoding, use D14/15 for HS/VS, invert VS. */ max9286_write(priv, 0x0c, MAX9286_HVEN | MAX9286_INVVS |