If the attached video sensor cannot provide the
requested image size, try to use resizing engine
included in the eMMa-PrP IP.
This patch supports both averaging and bilinear
algorithms.
Signed-off-by: Javier Martin <javier.martin@xxxxxxxxxxxxxxxxx>
---
Changes since v1:
- Fix several cosmetic issues.
- Don't return -EINVAL if resizing is not possible.
- Only allow resizing for YUYV format at the moment.
- Simplify some lines of code.
---
drivers/media/video/mx2_camera.c | 256 +++++++++++++++++++++++++++++++++++++-
1 files changed, 252 insertions(+), 4 deletions(-)
diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
index fcb6b3f..453ad4c 100644
--- a/drivers/media/video/mx2_camera.c
+++ b/drivers/media/video/mx2_camera.c
@@ -19,6 +19,7 @@
#include <linux/dma-mapping.h>
#include <linux/errno.h>
#include <linux/fs.h>
+#include <linux/gcd.h>
#include <linux/interrupt.h>
#include <linux/kernel.h>
#include <linux/mm.h>
@@ -204,10 +205,25 @@
#define PRP_INTR_LBOVF (1 << 7)
#define PRP_INTR_CH2OVF (1 << 8)
+/* Resizing registers */
+#define PRP_RZ_VALID_TBL_LEN(x) ((x) << 24)
+#define PRP_RZ_VALID_BILINEAR (1 << 31)
+
#define mx27_camera_emma(pcdev) (cpu_is_mx27() && pcdev->use_emma)
#define MAX_VIDEO_MEM 16
+#define RESIZE_NUM_MIN 1
+#define RESIZE_NUM_MAX 20
+#define BC_COEF 3
+#define SZ_COEF (1 << BC_COEF)
+
+#define RESIZE_DIR_H 0
+#define RESIZE_DIR_V 1
+
+#define RESIZE_ALGO_BILINEAR 0
+#define RESIZE_ALGO_AVERAGING 1
+
struct mx2_prp_cfg {
int channel;
u32 in_fmt;
@@ -217,6 +233,13 @@ struct mx2_prp_cfg {
u32 irq_flags;
};
+/* prp resizing parameters */
+struct emma_prp_resize {
+ int algo; /* type of algorithm used */
+ int len; /* number of coefficients */
+ unsigned char s[RESIZE_NUM_MAX]; /* table of coefficients */
+};
+
/* prp configuration for a client-host fmt pair */
struct mx2_fmt_cfg {
enum v4l2_mbus_pixelcode in_fmt;
@@ -278,6 +301,8 @@ struct mx2_camera_dev {
dma_addr_t discard_buffer_dma;
size_t discard_size;
struct mx2_fmt_cfg *emma_prp;
+ struct emma_prp_resize resizing[2];
+ unsigned int s_width, s_height;
u32 frame_count;
struct vb2_alloc_ctx *alloc_ctx;
};
@@ -687,7 +712,7 @@ static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
struct mx2_camera_dev *pcdev = ici->priv;
struct mx2_fmt_cfg *prp = pcdev->emma_prp;
- writel((icd->user_width << 16) | icd->user_height,
+ writel((pcdev->s_width << 16) | pcdev->s_height,
pcdev->base_emma + PRP_SRC_FRAME_SIZE);
writel(prp->cfg.src_pixel,
pcdev->base_emma + PRP_SRC_PIXEL_FORMAT_CNTL);
@@ -707,6 +732,74 @@ static void mx27_camera_emma_buf_init(struct soc_camera_device *icd,
writel(prp->cfg.irq_flags, pcdev->base_emma + PRP_INTR_CNTL);
}
+static void mx2_prp_resize_commit(struct mx2_camera_dev *pcdev)
+{
+ int dir;
+
+ for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
+ unsigned char *s = pcdev->resizing[dir].s;
+ int len = pcdev->resizing[dir].len;
+ unsigned int coeff[2] = {0, 0};
+ unsigned int valid = 0;
+ int i;
+
+ if (len == 0)
+ continue;
+
+ for (i = RESIZE_NUM_MAX - 1; i >= 0; i--) {
+ int j;
+
+ j = i > 9 ? 1 : 0;
+ coeff[j] = (coeff[j] << BC_COEF) |
+ (s[i] & (SZ_COEF - 1));
+
+ if (i == 5 || i == 15)
+ coeff[j] <<= 1;
+
+ valid = (valid << 1) | (s[i] >> BC_COEF);
+ }
+
+ valid |= PRP_RZ_VALID_TBL_LEN(len);
+
+ if (pcdev->resizing[dir].algo == RESIZE_ALGO_BILINEAR)
+ valid |= PRP_RZ_VALID_BILINEAR;
+
+ if (pcdev->emma_prp->cfg.channel == 1) {
+ if (dir == RESIZE_DIR_H) {
+ writel(coeff[0], pcdev->base_emma +
+ PRP_CH1_RZ_HORI_COEF1);
+ writel(coeff[1], pcdev->base_emma +
+ PRP_CH1_RZ_HORI_COEF2);
+ writel(valid, pcdev->base_emma +
+ PRP_CH1_RZ_HORI_VALID);
+ } else {
+ writel(coeff[0], pcdev->base_emma +
+ PRP_CH1_RZ_VERT_COEF1);
+ writel(coeff[1], pcdev->base_emma +
+ PRP_CH1_RZ_VERT_COEF2);
+ writel(valid, pcdev->base_emma +
+ PRP_CH1_RZ_VERT_VALID);
+ }
+ } else {
+ if (dir == RESIZE_DIR_H) {
+ writel(coeff[0], pcdev->base_emma +
+ PRP_CH2_RZ_HORI_COEF1);
+ writel(coeff[1], pcdev->base_emma +
+ PRP_CH2_RZ_HORI_COEF2);
+ writel(valid, pcdev->base_emma +
+ PRP_CH2_RZ_HORI_VALID);
+ } else {
+ writel(coeff[0], pcdev->base_emma +
+ PRP_CH2_RZ_VERT_COEF1);
+ writel(coeff[1], pcdev->base_emma +
+ PRP_CH2_RZ_VERT_COEF2);
+ writel(valid, pcdev->base_emma +
+ PRP_CH2_RZ_VERT_VALID);
+ }
+ }
+ }
+}
+
static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
{
struct soc_camera_device *icd = soc_camera_from_vb2q(q);
@@ -773,6 +866,8 @@ static int mx2_start_streaming(struct vb2_queue *q, unsigned int count)
list_add_tail(&pcdev->buf_discard[1].queue,
&pcdev->discard);
+ mx2_prp_resize_commit(pcdev);
+
mx27_camera_emma_buf_init(icd, bytesperline);
if (prp->cfg.channel == 1) {
@@ -1059,6 +1154,119 @@ static int mx2_camera_get_formats(struct soc_camera_device *icd,
return formats;
}
+static int mx2_emmaprp_resize(struct mx2_camera_dev *pcdev,
+ struct v4l2_mbus_framefmt *mf_in,
+ struct v4l2_pix_format *pix_out)
+{
+ int num, den;
+ unsigned long m;
+ int i, dir;
+
+ for (dir = RESIZE_DIR_H; dir <= RESIZE_DIR_V; dir++) {
+ unsigned char *s = pcdev->resizing[dir].s;
+ int len = 0;
+ int in, out;
+
+ if (dir == RESIZE_DIR_H) {
+ in = mf_in->width;
+ out = pix_out->width;
+ } else {
+ in = mf_in->height;
+ out = pix_out->height;
+ }
+
+ if (in < out)
+ return -EINVAL;
+ else if (in == out)
+ continue;
+
+ /* Calculate ratio */
+ m = gcd(in, out);
+ num = in / m;
+ den = out / m;
+ if (num > RESIZE_NUM_MAX)
+ return -EINVAL;
+
+ if ((num >= 2 * den) && (den == 1) &&
+ (num < 9) && (!(num & 0x01))) {
+ int sum = 0;
+ int j;
+
+ /* Average scaling for >= 2:1 ratios */
+ /* Support can be added for num >=9 and odd values */
+
+ pcdev->resizing[dir].algo = RESIZE_ALGO_AVERAGING;
+ len = num;
+
+ for (i = 0; i < (len / 2); i++)
+ s[i] = 8;
+
+ do {
+ for (i = 0; i < (len / 2); i++) {
+ s[i] = s[i] >> 1;
+ sum = 0;
+ for (j = 0; j < (len / 2); j++)
+ sum += s[j];
+ if (sum == 4)
+ break;
+ }
+ } while (sum != 4);
+
+ for (i = (len / 2); i < len; i++)
+ s[i] = s[len - i - 1];
+
+ s[len - 1] |= SZ_COEF;
+ } else {
+ /* bilinear scaling for < 2:1 ratios */
+ int v; /* overflow counter */
+ int coeff, nxt; /* table output */
+ int in_pos_inc = 2 * den;
+ int out_pos = num;
+ int out_pos_inc = 2 * num;
+ int init_carry = num - den;
+ int carry = init_carry;
+
+ pcdev->resizing[dir].algo = RESIZE_ALGO_BILINEAR;
+ v = den + in_pos_inc;
+ do {
+ coeff = v - out_pos;
+ out_pos += out_pos_inc;
+ carry += out_pos_inc;
+ for (nxt = 0; v < out_pos; nxt++) {
+ v += in_pos_inc;
+ carry -= in_pos_inc;
+ }
+
+ if (len > RESIZE_NUM_MAX)
+ return -EINVAL;
+
+ coeff = ((coeff << BC_COEF) +
+ (in_pos_inc >> 1)) / in_pos_inc;
+
+ if (coeff >= (SZ_COEF - 1))
+ coeff--;
+
+ coeff |= SZ_COEF;
+ s[len] = (unsigned char)coeff;
+ len++;
+
+ for (i = 1; i < nxt; i++) {
+ if (len >= RESIZE_NUM_MAX)
+ return -EINVAL;
+ s[len] = 0;
+ len++;
+ }
+ } while (carry != init_carry);
+ }
+ pcdev->resizing[dir].len = len;
+ if (dir == RESIZE_DIR_H)
+ mf_in->width = pix_out->width;
+ else
+ mf_in->height = pix_out->height;
+ }
+ return 0;
+}
+
static int mx2_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_format *f)
{
@@ -1070,6 +1278,9 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
struct v4l2_mbus_framefmt mf;
int ret;
+ dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
+ __func__, pix->width, pix->height);
+
xlate = soc_camera_xlate_by_fourcc(icd, pix->pixelformat);
if (!xlate) {
dev_warn(icd->parent, "Format %x not found\n",
@@ -1087,6 +1298,22 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
if (ret < 0 && ret != -ENOIOCTLCMD)
return ret;
+ /* Store width and height returned by the sensor for resizing */
+ pcdev->s_width = mf.width;
+ pcdev->s_height = mf.height;
+ dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
+ __func__, pcdev->s_width, pcdev->s_height);
+
+ pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
+ xlate->host_fmt->fourcc);
+
+ memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
+ if ((mf.width != pix->width || mf.height != pix->height) &&
+ pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
+ if (mx2_emmaprp_resize(pcdev, &mf, pix) < 0)
+ dev_dbg(icd->parent, "%s: can't resize\n", __func__);
+ }
+
if (mf.code != xlate->code)
return -EINVAL;
@@ -1096,9 +1323,8 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
pix->colorspace = mf.colorspace;
icd->current_fmt = xlate;
- if (mx27_camera_emma(pcdev))
- pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
- xlate->host_fmt->fourcc);
+ dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
+ __func__, pix->width, pix->height);
return 0;
}
@@ -1111,9 +1337,14 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
struct v4l2_pix_format *pix = &f->fmt.pix;
struct v4l2_mbus_framefmt mf;
__u32 pixfmt = pix->pixelformat;
+ struct soc_camera_host *ici = to_soc_camera_host(icd->parent);
+ struct mx2_camera_dev *pcdev = ici->priv;
unsigned int width_limit;
int ret;
+ dev_dbg(icd->parent, "%s: requested params: width = %d, height = %d\n",
+ __func__, pix->width, pix->height);
+
xlate = soc_camera_xlate_by_fourcc(icd, pixfmt);
if (pixfmt && !xlate) {
dev_warn(icd->parent, "Format %x not found\n", pixfmt);
@@ -1163,6 +1394,20 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
if (ret < 0)
return ret;
+ dev_dbg(icd->parent, "%s: sensor params: width = %d, height = %d\n",
+ __func__, pcdev->s_width, pcdev->s_height);
+
+ /* If the sensor does not support image size try PrP resizing */
+ pcdev->emma_prp = mx27_emma_prp_get_format(xlate->code,
+ xlate->host_fmt->fourcc);
+
+ memset(pcdev->resizing, 0, sizeof(pcdev->resizing));
+ if ((mf.width != pix->width || mf.height != pix->height) &&
+ pcdev->emma_prp->cfg.in_fmt == PRP_CNTL_DATA_IN_YUV422) {
+ if (mx2_emmaprp_resize(pcdev, &mf, pix) < 0)
+ dev_dbg(icd->parent, "%s: can't resize\n", __func__);
+ }
+
if (mf.field == V4L2_FIELD_ANY)
mf.field = V4L2_FIELD_NONE;
/*
@@ -1181,6 +1426,9 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
pix->field = mf.field;
pix->colorspace = mf.colorspace;
+ dev_dbg(icd->parent, "%s: returned params: width = %d, height = %d\n",
+ __func__, pix->width, pix->height);
+
return 0;
}
--
1.7.0.4
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