From patchwork Sat Jan 1 18:28:00 2022 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit X-Patchwork-Submitter: Laurent Pinchart X-Patchwork-Id: 12702133 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 3D5BFC46467 for ; Sat, 1 Jan 2022 18:28:20 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S232657AbiAAS2T (ORCPT ); Sat, 1 Jan 2022 13:28:19 -0500 Received: from perceval.ideasonboard.com ([213.167.242.64]:41358 "EHLO perceval.ideasonboard.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S232644AbiAAS2S (ORCPT ); Sat, 1 Jan 2022 13:28:18 -0500 Received: from pendragon.lan (62-78-145-57.bb.dnainternet.fi [62.78.145.57]) by perceval.ideasonboard.com (Postfix) with ESMTPSA id 8BAF31C05; Sat, 1 Jan 2022 19:28:16 +0100 (CET) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=ideasonboard.com; s=mail; t=1641061697; bh=sOpCj9w9HvlAvFT8NODOVxRC+SFPiWORlRc+hiWvmM0=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=BK993IaH5gyuXDZk01ZNoiedE4lf5d5M6N+J0zIAM46IGeUKRFisZT9gi9NT6geJO wDewub9jesJwxVIvCrqlDgTh+T5vt0H16mlY8bdorBE76U11ql7tan4KOvRtmMEqG0 R2IZ+WwJbiPyTEprCBz0VMyafz4zM/5qFdFfKm1Y= From: Laurent Pinchart To: linux-media@vger.kernel.org Cc: linux-renesas-soc@vger.kernel.org, Jacopo Mondi , Kieran Bingham , =?utf-8?q?Niklas_S=C3=B6d?= =?utf-8?q?erlund?= , Thomas Nizan Subject: [PATCH v2 05/11] media: i2c: max9286: Support manual framesync operation Date: Sat, 1 Jan 2022 20:28:00 +0200 Message-Id: <20220101182806.19311-6-laurent.pinchart+renesas@ideasonboard.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20220101182806.19311-1-laurent.pinchart+renesas@ideasonboard.com> References: <20220101182806.19311-1-laurent.pinchart+renesas@ideasonboard.com> MIME-Version: 1.0 Precedence: bulk List-ID: X-Mailing-List: linux-media@vger.kernel.org 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 Reviewed-by: Jacopo Mondi --- Changes since v1: - Use pixel rate to calculate frame sync counter --- drivers/media/i2c/max9286.c | 84 +++++++++++++++++++++++++++++++++---- 1 file changed, 75 insertions(+), 9 deletions(-) diff --git a/drivers/media/i2c/max9286.c b/drivers/media/i2c/max9286.c index 15c80034e3a4..75374034724f 100644 --- a/drivers/media/i2c/max9286.c +++ b/drivers/media/i2c/max9286.c @@ -170,9 +170,11 @@ struct max9286_priv { u32 rev_chan_mv; struct v4l2_ctrl_handler ctrls; - struct v4l2_ctrl *pixelrate; + struct v4l2_ctrl *pixelrate_ctrl; + unsigned int pixelrate; struct v4l2_mbus_framefmt fmt[MAX9286_N_SINKS]; + struct v4l2_fract interval; /* Protects controls and fmt structures */ struct mutex mutex; @@ -473,6 +475,40 @@ 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. + */ + fsync = div_u64((u64)priv->pixelrate * priv->interval.numerator, + priv->interval.denominator); + + dev_dbg(&priv->client->dev, "fsync period %u (pclk %u)\n", fsync, + priv->pixelrate); + + 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 */ @@ -511,11 +547,13 @@ static int max9286_set_pixelrate(struct max9286_priv *priv) return -EINVAL; } + priv->pixelrate = pixelrate; + /* * The CSI-2 transmitter pixel rate is the single source rate multiplied * by the number of available sources. */ - return v4l2_ctrl_s_ctrl_int64(priv->pixelrate, + return v4l2_ctrl_s_ctrl_int64(priv->pixelrate_ctrl, pixelrate * priv->nsources); } @@ -655,6 +693,8 @@ 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 @@ -714,6 +754,32 @@ 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) @@ -805,6 +871,8 @@ 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 = { @@ -885,10 +953,10 @@ static int max9286_v4l2_register(struct max9286_priv *priv) priv->sd.flags |= V4L2_SUBDEV_FL_HAS_DEVNODE; v4l2_ctrl_handler_init(&priv->ctrls, 1); - priv->pixelrate = v4l2_ctrl_new_std(&priv->ctrls, - &max9286_ctrl_ops, - V4L2_CID_PIXEL_RATE, - 1, INT_MAX, 1, 50000000); + priv->pixelrate_ctrl = v4l2_ctrl_new_std(&priv->ctrls, + &max9286_ctrl_ops, + V4L2_CID_PIXEL_RATE, + 1, INT_MAX, 1, 50000000); priv->sd.ctrl_handler = &priv->ctrls; ret = priv->ctrls.error; @@ -997,9 +1065,7 @@ 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 |