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Date: Wed, 15 Feb 2017 18:38:03 -0800
From: Steve Longerbeam <steve_longerbeam@...tor.com>
To: Steve Longerbeam <slongerbeam@...il.com>, <robh+dt@...nel.org>,
<mark.rutland@....com>, <shawnguo@...nel.org>,
<kernel@...gutronix.de>, <fabio.estevam@....com>,
<linux@...linux.org.uk>, <mchehab@...nel.org>,
<hverkuil@...all.nl>, <nick@...anahar.org>,
<markus.heiser@...marIT.de>, <p.zabel@...gutronix.de>,
<laurent.pinchart+renesas@...asonboard.com>, <bparrot@...com>,
<geert@...ux-m68k.org>, <arnd@...db.de>,
<sudipm.mukherjee@...il.com>, <minghsiu.tsai@...iatek.com>,
<tiffany.lin@...iatek.com>, <jean-christophe.trotin@...com>,
<horms+renesas@...ge.net.au>,
<niklas.soderlund+renesas@...natech.se>, <robert.jarzmik@...e.fr>,
<songjun.wu@...rochip.com>, <andrew-ct.chen@...iatek.com>,
<gregkh@...uxfoundation.org>, <shuah@...nel.org>,
<sakari.ailus@...ux.intel.com>, <pavel@....cz>
CC: <devicetree@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
<linux-arm-kernel@...ts.infradead.org>,
<linux-media@...r.kernel.org>, <devel@...verdev.osuosl.org>,
Russell King <rmk+kernel@...linux.org.uk>
Subject: Re: [PATCH v4 32/36] media: imx: csi/fim: add support for frame
intervals
Sorry, I forgot to change authorship on this patch. It should
be authored by Russell King <rmk+kernel@...linux.org.uk>.
Steve
On 02/15/2017 06:19 PM, Steve Longerbeam wrote:
> Add support to CSI for negotiation of frame intervals, and use this
> information to configure the frame interval monitor.
>
> Signed-off-by: Russell King <rmk+kernel@...linux.org.uk>
> Signed-off-by: Steve Longerbeam <steve_longerbeam@...tor.com>
> ---
> drivers/staging/media/imx/imx-media-csi.c | 36 ++++++++++++++++++++++++++++---
> drivers/staging/media/imx/imx-media-fim.c | 28 +++++++++---------------
> drivers/staging/media/imx/imx-media.h | 2 +-
> 3 files changed, 44 insertions(+), 22 deletions(-)
>
> diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
> index b0aac82..040cca6 100644
> --- a/drivers/staging/media/imx/imx-media-csi.c
> +++ b/drivers/staging/media/imx/imx-media-csi.c
> @@ -56,6 +56,7 @@ struct csi_priv {
>
> struct v4l2_mbus_framefmt format_mbus[CSI_NUM_PADS];
> const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
> + struct v4l2_fract frame_interval;
> struct v4l2_rect crop;
>
> /* the video device at IDMAC output pad */
> @@ -565,7 +566,8 @@ static int csi_start(struct csi_priv *priv)
>
> /* start the frame interval monitor */
> if (priv->fim) {
> - ret = imx_media_fim_set_stream(priv->fim, priv->sensor, true);
> + ret = imx_media_fim_set_stream(priv->fim,
> + &priv->frame_interval, true);
> if (ret)
> goto idmac_stop;
> }
> @@ -580,7 +582,8 @@ static int csi_start(struct csi_priv *priv)
>
> fim_off:
> if (priv->fim)
> - imx_media_fim_set_stream(priv->fim, priv->sensor, false);
> + imx_media_fim_set_stream(priv->fim,
> + &priv->frame_interval, false);
> idmac_stop:
> if (priv->dest == IPU_CSI_DEST_IDMAC)
> csi_idmac_stop(priv);
> @@ -594,11 +597,36 @@ static void csi_stop(struct csi_priv *priv)
>
> /* stop the frame interval monitor */
> if (priv->fim)
> - imx_media_fim_set_stream(priv->fim, priv->sensor, false);
> + imx_media_fim_set_stream(priv->fim,
> + &priv->frame_interval, false);
>
> ipu_csi_disable(priv->csi);
> }
>
> +static int csi_g_frame_interval(struct v4l2_subdev *sd,
> + struct v4l2_subdev_frame_interval *fi)
> +{
> + struct csi_priv *priv = v4l2_get_subdevdata(sd);
> +
> + fi->interval = priv->frame_interval;
> +
> + return 0;
> +}
> +
> +static int csi_s_frame_interval(struct v4l2_subdev *sd,
> + struct v4l2_subdev_frame_interval *fi)
> +{
> + struct csi_priv *priv = v4l2_get_subdevdata(sd);
> +
> + /* Output pads mirror active input pad, no limits on input pads */
> + if (fi->pad == CSI_SRC_PAD_IDMAC || fi->pad == CSI_SRC_PAD_DIRECT)
> + fi->interval = priv->frame_interval;
> +
> + priv->frame_interval = fi->interval;
> +
> + return 0;
> +}
> +
> static int csi_s_stream(struct v4l2_subdev *sd, int enable)
> {
> struct csi_priv *priv = v4l2_get_subdevdata(sd);
> @@ -1187,6 +1215,8 @@ static struct v4l2_subdev_core_ops csi_core_ops = {
> };
>
> static struct v4l2_subdev_video_ops csi_video_ops = {
> + .g_frame_interval = csi_g_frame_interval,
> + .s_frame_interval = csi_s_frame_interval,
> .s_stream = csi_s_stream,
> };
>
> diff --git a/drivers/staging/media/imx/imx-media-fim.c b/drivers/staging/media/imx/imx-media-fim.c
> index acc7e39..a6ed57e 100644
> --- a/drivers/staging/media/imx/imx-media-fim.c
> +++ b/drivers/staging/media/imx/imx-media-fim.c
> @@ -67,26 +67,18 @@ struct imx_media_fim {
> };
>
> static void update_fim_nominal(struct imx_media_fim *fim,
> - struct imx_media_subdev *sensor)
> + const struct v4l2_fract *fi)
> {
> - struct v4l2_streamparm parm;
> - struct v4l2_fract tpf;
> - int ret;
> -
> - parm.type = V4L2_BUF_TYPE_VIDEO_CAPTURE;
> - ret = v4l2_subdev_call(sensor->sd, video, g_parm, &parm);
> - tpf = parm.parm.capture.timeperframe;
> -
> - if (ret || tpf.denominator == 0) {
> - dev_dbg(fim->sd->dev, "no tpf from sensor, FIM disabled\n");
> + if (fi->denominator == 0) {
> + dev_dbg(fim->sd->dev, "no frame interval, FIM disabled\n");
> fim->enabled = false;
> return;
> }
>
> - fim->nominal = DIV_ROUND_CLOSEST(1000 * 1000 * tpf.numerator,
> - tpf.denominator);
> + fim->nominal = DIV_ROUND_CLOSEST_ULL(1000000ULL * (u64)fi->numerator,
> + fi->denominator);
>
> - dev_dbg(fim->sd->dev, "sensor FI=%lu usec\n", fim->nominal);
> + dev_dbg(fim->sd->dev, "FI=%lu usec\n", fim->nominal);
> }
>
> static void reset_fim(struct imx_media_fim *fim, bool curval)
> @@ -130,8 +122,8 @@ static void send_fim_event(struct imx_media_fim *fim, unsigned long error)
>
> /*
> * Monitor an averaged frame interval. If the average deviates too much
> - * from the sensor's nominal frame rate, send the frame interval error
> - * event. The frame intervals are averaged in order to quiet noise from
> + * from the nominal frame rate, send the frame interval error event. The
> + * frame intervals are averaged in order to quiet noise from
> * (presumably random) interrupt latency.
> */
> static void frame_interval_monitor(struct imx_media_fim *fim,
> @@ -422,12 +414,12 @@ EXPORT_SYMBOL_GPL(imx_media_fim_set_power);
>
> /* Called by the subdev in its s_stream callback */
> int imx_media_fim_set_stream(struct imx_media_fim *fim,
> - struct imx_media_subdev *sensor,
> + const struct v4l2_fract *fi,
> bool on)
> {
> if (on) {
> reset_fim(fim, true);
> - update_fim_nominal(fim, sensor);
> + update_fim_nominal(fim, fi);
>
> if (fim->icap_channel >= 0)
> fim_acquire_first_ts(fim);
> diff --git a/drivers/staging/media/imx/imx-media.h b/drivers/staging/media/imx/imx-media.h
> index ae3af0d..7f19739 100644
> --- a/drivers/staging/media/imx/imx-media.h
> +++ b/drivers/staging/media/imx/imx-media.h
> @@ -259,7 +259,7 @@ struct imx_media_fim;
> void imx_media_fim_eof_monitor(struct imx_media_fim *fim, struct timespec *ts);
> int imx_media_fim_set_power(struct imx_media_fim *fim, bool on);
> int imx_media_fim_set_stream(struct imx_media_fim *fim,
> - struct imx_media_subdev *sensor,
> + const struct v4l2_fract *frame_interval,
> bool on);
> struct imx_media_fim *imx_media_fim_init(struct v4l2_subdev *sd);
> void imx_media_fim_free(struct imx_media_fim *fim);
--
Steve Longerbeam | Senior Embedded Engineer, ESD Services
Mentor Embedded(tm) | 46871 Bayside Parkway, Fremont, CA 94538
P 510.354.5838 | M 408.410.2735
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