On Tue, 14 Feb 2012, Javier Martin wrote:
> 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>
> ---
> drivers/media/video/mx2_camera.c | 251 +++++++++++++++++++++++++++++++++++++-
> 1 files changed, 249 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/media/video/mx2_camera.c b/drivers/media/video/mx2_camera.c
> index 9e84368..6516ee4 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));
Please, remember to indent line continuations.
> +
> + 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) {
Maybe put horizontal and vertical register addresses in an array too to
avoid this "if?" Just an idea - if you don't think, the code would look
nicer, just leave as is.
> + 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 */
">=" rather than ">"
> + /* Support can be added for num >=9 and odd values */
So, this is only used for downscaling by 1/2, 1/4, 1/6, and 1/8?
> +
> + 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 = mf_in->width * den / num;
> + else
> + mf_in->height = mf_in->height * den / num;
Aren't your calculations exact, so that here you can just use
pix_out->width and 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 +1298,18 @@ 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);
> +
> + memset(pcdev->resizing, 0, sizeof(struct emma_prp_resize) << 1);
I think, just sizeof(pcdev->resizing) will do the trick.
> + if (mf.width != pix->width || mf.height != pix->height) {
> + if (mx2_emmaprp_resize(pcdev, &mf, pix) < 0)
> + return -EINVAL;
Hmmm... This looks like a regression, not an improvement - you return more
errors now, than without this resizing support. Wouldn't it be possible to
fall back to the current behaviour if prp resizing is impossible?
> + }
> +
> if (mf.code != xlate->code)
> return -EINVAL;
>
> @@ -1100,6 +1323,9 @@ static int mx2_camera_set_fmt(struct soc_camera_device *icd,
> 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;
> }
>
> @@ -1109,11 +1335,16 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
> struct v4l2_subdev *sd = soc_camera_to_subdev(icd);
> const struct soc_camera_format_xlate *xlate;
> struct v4l2_pix_format *pix = &f->fmt.pix;
> - struct v4l2_mbus_framefmt mf;
> __u32 pixfmt = pix->pixelformat;
> + struct v4l2_mbus_framefmt mf;
This swap doesn't seem to be needed.
> + 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 +1394,19 @@ static int mx2_camera_try_fmt(struct soc_camera_device *icd,
> if (ret < 0)
> return ret;
>
> + /* Store width and height returned by the sensor for resizing */
> + pcdev->s_width = mf.width;
> + pcdev->s_height = mf.height;
You don't need these in .try_fmt().
> + 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 */
> + memset(pcdev->resizing, 0, sizeof(struct emma_prp_resize) << 1);
Same for sizeof()
> + if (mf.width != pix->width || mf.height != pix->height) {
> + if (mx2_emmaprp_resize(pcdev, &mf, pix) < 0)
> + return -EINVAL;
.try_fmt() really shouldn't fail.
> + }
> +
> if (mf.field == V4L2_FIELD_ANY)
> mf.field = V4L2_FIELD_NONE;
> /*
> @@ -1181,6 +1425,9 @@ 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
Thanks
Guennadi
---
Guennadi Liakhovetski, Ph.D.
Freelance Open-Source Software Developer
http://www.open-technology.de/
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