From: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
The CSI can skip any out of up to 6 input frames, allowing to reduce the
frame rate at the output pads by small fractions.
Signed-off-by: Philipp Zabel <p.zabel@xxxxxxxxxxxxxx>
Signed-off-by: Steve Longerbeam <steve_longerbeam@xxxxxxxxxx>
---
drivers/staging/media/imx/imx-media-csi.c | 125 ++++++++++++++++++++++++++++--
1 file changed, 120 insertions(+), 5 deletions(-)
diff --git a/drivers/staging/media/imx/imx-media-csi.c b/drivers/staging/media/imx/imx-media-csi.c
index a726744..e5105ec 100644
--- a/drivers/staging/media/imx/imx-media-csi.c
+++ b/drivers/staging/media/imx/imx-media-csi.c
@@ -1,13 +1,15 @@
/*
* V4L2 Capture CSI Subdev for Freescale i.MX5/6 SOC
*
- * Copyright (c) 2014-2016 Mentor Graphics Inc.
+ * Copyright (c) 2014-2017 Mentor Graphics Inc.
+ * Copyright (C) 2017 Pengutronix, Philipp Zabel <kernel@xxxxxxxxxxxxxx>
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; either version 2 of the License, or
* (at your option) any later version.
*/
+#include <linux/gcd.h>
#include <linux/interrupt.h>
#include <linux/module.h>
#include <linux/platform_device.h>
@@ -40,6 +42,18 @@
#define H_ALIGN 1 /* multiple of 2 lines */
#define S_ALIGN 1 /* multiple of 2 */
+/*
+ * struct csi_skip_desc - CSI frame skipping descriptor
+ * @keep - number of frames kept per max_ratio frames
+ * @max_ratio - width of skip_smfc, written to MAX_RATIO bitfield
+ * @skip_smfc - skip pattern written to the SKIP_SMFC bitfield
+ */
+struct csi_skip_desc {
+ u8 keep;
+ u8 max_ratio;
+ u8 skip_smfc;
+};
+
struct csi_priv {
struct device *dev;
struct ipu_soc *ipu;
@@ -65,6 +79,7 @@ struct csi_priv {
const struct imx_media_pixfmt *cc[CSI_NUM_PADS];
struct v4l2_fract frame_interval;
struct v4l2_rect crop;
+ const struct csi_skip_desc *skip[CSI_NUM_PADS - 1];
/* active vb2 buffers to send to video dev sink */
struct imx_media_buffer *active_vb2_buf[2];
@@ -517,10 +532,12 @@ static int csi_setup(struct csi_priv *priv)
struct v4l2_mbus_config sensor_mbus_cfg;
struct v4l2_of_endpoint *sensor_ep;
struct v4l2_mbus_framefmt if_fmt;
+ const struct csi_skip_desc *skip;
infmt = &priv->format_mbus[CSI_SINK_PAD];
outfmt = &priv->format_mbus[priv->active_output_pad];
sensor_ep = &priv->sensor->sensor_ep;
+ skip = priv->skip[priv->active_output_pad - 1];
/* compose mbus_config from sensor endpoint */
sensor_mbus_cfg.type = sensor_ep->bus_type;
@@ -545,6 +562,9 @@ static int csi_setup(struct csi_priv *priv)
ipu_csi_set_dest(priv->csi, priv->dest);
+ ipu_csi_set_skip_smfc(priv->csi, skip->skip_smfc, skip->max_ratio - 1,
+ 0);
+
ipu_csi_dump(priv->csi);
return 0;
@@ -608,6 +628,77 @@ static void csi_stop(struct csi_priv *priv)
ipu_csi_disable(priv->csi);
}
+static const struct csi_skip_desc csi_skip[12] = {
+ { 1, 1, 0x00 }, /* Keep all frames */
+ { 5, 6, 0x10 }, /* Skip every sixth frame */
+ { 4, 5, 0x08 }, /* Skip every fifth frame */
+ { 3, 4, 0x04 }, /* Skip every fourth frame */
+ { 2, 3, 0x02 }, /* Skip every third frame */
+ { 3, 5, 0x0a }, /* Skip frames 1 and 3 of every 5 */
+ { 1, 2, 0x01 }, /* Skip every second frame */
+ { 2, 5, 0x0b }, /* Keep frames 1 and 4 of every 5 */
+ { 1, 3, 0x03 }, /* Keep one in three frames */
+ { 1, 4, 0x07 }, /* Keep one in four frames */
+ { 1, 5, 0x0f }, /* Keep one in five frames */
+ { 1, 6, 0x1f }, /* Keep one in six frames */
+};
+
+static void csi_apply_skip_interval(const struct csi_skip_desc *skip,
+ struct v4l2_fract *interval)
+{
+ unsigned int div;
+
+ interval->numerator *= skip->max_ratio;
+ interval->denominator *= skip->keep;
+
+ /* Reduce fraction to lowest terms */
+ div = gcd(interval->numerator, interval->denominator);
+ if (div > 1) {
+ interval->numerator /= div;
+ interval->denominator /= div;
+ }
+}
+
+/*
+ * Find the skip pattern to produce the output frame interval closest to the
+ * requested one, for the given input frame interval. Updates the output frame
+ * interval to the exact value.
+ */
+static const struct csi_skip_desc *csi_find_best_skip(struct v4l2_fract *in,
+ struct v4l2_fract *out)
+{
+ const struct csi_skip_desc *skip = &csi_skip[0], *best_skip = skip;
+ u32 min_err = UINT_MAX;
+ u64 want_us;
+ int i;
+
+ /* Default to 1:1 ratio */
+ if (out->numerator == 0 || out->denominator == 0 ||
+ in->numerator == 0 || in->denominator == 0)
+ return best_skip;
+
+ want_us = div_u64((u64)USEC_PER_SEC * out->numerator, out->denominator);
+
+ /* Find the reduction closest to the requested time per frame */
+ for (i = 0; i < ARRAY_SIZE(csi_skip); i++, skip++) {
+ u64 tmp, err;
+
+ tmp = div_u64((u64)USEC_PER_SEC * in->numerator *
+ skip->max_ratio, in->denominator * skip->keep);
+
+ err = abs((s64)tmp - want_us);
+ if (err < min_err) {
+ min_err = err;
+ best_skip = skip;
+ }
+ }
+
+ *out = *in;
+ csi_apply_skip_interval(best_skip, out);
+
+ return best_skip;
+}
+
/*
* V4L2 subdev operations.
*/
@@ -617,8 +708,16 @@ static int csi_g_frame_interval(struct v4l2_subdev *sd,
{
struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ if (fi->pad >= CSI_NUM_PADS)
+ return -EINVAL;
+
mutex_lock(&priv->lock);
+
fi->interval = priv->frame_interval;
+
+ if (fi->pad != CSI_SINK_PAD)
+ csi_apply_skip_interval(priv->skip[fi->pad - 1], &fi->interval);
+
mutex_unlock(&priv->lock);
return 0;
@@ -629,14 +728,27 @@ static int csi_s_frame_interval(struct v4l2_subdev *sd,
{
struct csi_priv *priv = v4l2_get_subdevdata(sd);
+ if (fi->pad >= CSI_NUM_PADS)
+ return -EINVAL;
+
mutex_lock(&priv->lock);
- /* 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;
+ /* No limits on input pad */
+ if (fi->pad == CSI_SINK_PAD) {
+ priv->frame_interval = fi->interval;
+
+ /* Reset frame skipping ratio to 1:1 */
+ priv->skip[0] = &csi_skip[0];
+ priv->skip[1] = &csi_skip[0];
- priv->frame_interval = fi->interval;
+ goto out;
+ }
+
+ /* Output pads depend on input interval, modified by frame skipping */
+ priv->skip[fi->pad - 1] = csi_find_best_skip(&priv->frame_interval,
+ &fi->interval);
+out:
mutex_unlock(&priv->lock);
return 0;
@@ -1256,6 +1368,9 @@ static int csi_registered(struct v4l2_subdev *sd)
&priv->cc[i]);
if (ret)
goto put_csi;
+ /* disable frame skipping */
+ if (i != CSI_SINK_PAD)
+ priv->skip[i - 1] = &csi_skip[0];
}
/* init default frame interval */
--
2.7.4
