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Subject[PATCH v4 3/4] gpu: ipu-v3: ipu-ic: Add support for BT.709 encoding
Date
Pass v4l2 encoding enum to the ipu_ic task init functions, and add
support for the BT.709 encoding and inverse encoding matrices.

Reported-by: Tim Harvey <tharvey@gateworks.com>
Signed-off-by: Steve Longerbeam <slongerbeam@gmail.com>
---
Changes in v4:
- fix compile error.
Chnges in v3:
- none.
Changes in v2:
- only return "Unsupported YCbCr encoding" error if inf != outf,
since if inf == outf, the identity matrix can be used. Reported
by Tim Harvey.
---
drivers/gpu/ipu-v3/ipu-ic.c | 71 +++++++++++++++++++--
drivers/gpu/ipu-v3/ipu-image-convert.c | 1 +
drivers/staging/media/imx/imx-ic-prpencvf.c | 4 +-
include/video/imx-ipu-v3.h | 5 +-
4 files changed, 71 insertions(+), 10 deletions(-)

diff --git a/drivers/gpu/ipu-v3/ipu-ic.c b/drivers/gpu/ipu-v3/ipu-ic.c
index e459615a49a1..c5f83d7e357f 100644
--- a/drivers/gpu/ipu-v3/ipu-ic.c
+++ b/drivers/gpu/ipu-v3/ipu-ic.c
@@ -212,6 +212,23 @@ static const struct ic_csc_params ic_csc_identity = {
.scale = 2,
};

+/*
+ * BT.709 encoding from RGB full range to YUV limited range:
+ *
+ * Y = R * .2126 + G * .7152 + B * .0722;
+ * U = R * -.1146 + G * -.3854 + B * .5000 + 128.;
+ * V = R * .5000 + G * -.4542 + B * -.0458 + 128.;
+ */
+static const struct ic_csc_params ic_csc_rgb2ycbcr_bt709 = {
+ .coeff = {
+ { 54, 183, 18 },
+ { 483, 413, 128 },
+ { 128, 396, 500 },
+ },
+ .offset = { 0, 512, 512 },
+ .scale = 1,
+};
+
/*
* Inverse BT.601 encoding from YUV limited range to RGB full range:
*
@@ -229,12 +246,31 @@ static const struct ic_csc_params ic_csc_ycbcr2rgb_bt601 = {
.scale = 2,
};

+/*
+ * Inverse BT.709 encoding from YUV limited range to RGB full range:
+ *
+ * R = (1. * (Y - 16)) + (1.5748 * (Cr - 128));
+ * G = (1. * (Y - 16)) - (0.1873 * (Cb - 128)) - (0.4681 * (Cr - 128));
+ * B = (1. * (Y - 16)) + (1.8556 * (Cb - 128);
+ */
+static const struct ic_csc_params ic_csc_ycbcr2rgb_bt709 = {
+ .coeff = {
+ { 128, 0, 202 },
+ { 128, 488, 452 },
+ { 128, 238, 0 },
+ },
+ .offset = { -435, 136, -507 },
+ .scale = 2,
+};
+
static int init_csc(struct ipu_ic *ic,
enum ipu_color_space inf,
enum ipu_color_space outf,
+ enum v4l2_ycbcr_encoding encoding,
int csc_index)
{
struct ipu_ic_priv *priv = ic->priv;
+ const struct ic_csc_params *params_rgb2yuv, *params_yuv2rgb;
const struct ic_csc_params *params;
u32 __iomem *base;
const u16 (*c)[3];
@@ -244,12 +280,30 @@ static int init_csc(struct ipu_ic *ic,
base = (u32 __iomem *)
(priv->tpmem_base + ic->reg->tpmem_csc[csc_index]);

+ switch (encoding) {
+ case V4L2_YCBCR_ENC_601:
+ params_rgb2yuv = &ic_csc_rgb2ycbcr_bt601;
+ params_yuv2rgb = &ic_csc_ycbcr2rgb_bt601;
+ break;
+ case V4L2_YCBCR_ENC_709:
+ params_rgb2yuv = &ic_csc_rgb2ycbcr_bt709;
+ params_yuv2rgb = &ic_csc_ycbcr2rgb_bt709;
+ break;
+ default:
+ if (inf != outf) {
+ dev_err(priv->ipu->dev,
+ "Unsupported YCbCr encoding\n");
+ return -EINVAL;
+ }
+ break;
+ }
+
if (inf == outf)
params = &ic_csc_identity;
else if (inf == IPUV3_COLORSPACE_YUV)
- params = &ic_csc_ycbcr2rgb_bt601;
+ params = params_yuv2rgb;
else
- params = &ic_csc_rgb2ycbcr_bt601;
+ params = params_rgb2yuv;

/* Cast to unsigned */
c = (const u16 (*)[3])params->coeff;
@@ -390,6 +444,7 @@ EXPORT_SYMBOL_GPL(ipu_ic_task_disable);

int ipu_ic_task_graphics_init(struct ipu_ic *ic,
enum ipu_color_space in_g_cs,
+ enum v4l2_ycbcr_encoding encoding,
bool galpha_en, u32 galpha,
bool colorkey_en, u32 colorkey)
{
@@ -408,7 +463,7 @@ int ipu_ic_task_graphics_init(struct ipu_ic *ic,
if (!(ic_conf & ic->bit->ic_conf_csc1_en)) {
/* need transparent CSC1 conversion */
ret = init_csc(ic, IPUV3_COLORSPACE_RGB,
- IPUV3_COLORSPACE_RGB, 0);
+ IPUV3_COLORSPACE_RGB, encoding, 0);
if (ret)
goto unlock;
}
@@ -416,7 +471,7 @@ int ipu_ic_task_graphics_init(struct ipu_ic *ic,
ic->g_in_cs = in_g_cs;

if (ic->g_in_cs != ic->out_cs) {
- ret = init_csc(ic, ic->g_in_cs, ic->out_cs, 1);
+ ret = init_csc(ic, ic->g_in_cs, ic->out_cs, encoding, 1);
if (ret)
goto unlock;
}
@@ -450,6 +505,7 @@ int ipu_ic_task_init_rsc(struct ipu_ic *ic,
int out_width, int out_height,
enum ipu_color_space in_cs,
enum ipu_color_space out_cs,
+ enum v4l2_ycbcr_encoding encoding,
u32 rsc)
{
struct ipu_ic_priv *priv = ic->priv;
@@ -485,7 +541,7 @@ int ipu_ic_task_init_rsc(struct ipu_ic *ic,
ic->out_cs = out_cs;

if (ic->in_cs != ic->out_cs) {
- ret = init_csc(ic, ic->in_cs, ic->out_cs, 0);
+ ret = init_csc(ic, ic->in_cs, ic->out_cs, encoding, 0);
if (ret)
goto unlock;
}
@@ -499,10 +555,11 @@ int ipu_ic_task_init(struct ipu_ic *ic,
int in_width, int in_height,
int out_width, int out_height,
enum ipu_color_space in_cs,
- enum ipu_color_space out_cs)
+ enum ipu_color_space out_cs,
+ enum v4l2_ycbcr_encoding encoding)
{
return ipu_ic_task_init_rsc(ic, in_width, in_height, out_width,
- out_height, in_cs, out_cs, 0);
+ out_height, in_cs, out_cs, encoding, 0);
}
EXPORT_SYMBOL_GPL(ipu_ic_task_init);

diff --git a/drivers/gpu/ipu-v3/ipu-image-convert.c b/drivers/gpu/ipu-v3/ipu-image-convert.c
index 13103ab86050..8b37daa99f58 100644
--- a/drivers/gpu/ipu-v3/ipu-image-convert.c
+++ b/drivers/gpu/ipu-v3/ipu-image-convert.c
@@ -1358,6 +1358,7 @@ static int convert_start(struct ipu_image_convert_run *run, unsigned int tile)
dest_width,
dest_height,
src_cs, dest_cs,
+ d_image->base.pix.ycbcr_enc,
rsc);
if (ret) {
dev_err(priv->ipu->dev, "ipu_ic_task_init failed, %d\n", ret);
diff --git a/drivers/staging/media/imx/imx-ic-prpencvf.c b/drivers/staging/media/imx/imx-ic-prpencvf.c
index 376b504e8a42..60ecf5809cc1 100644
--- a/drivers/staging/media/imx/imx-ic-prpencvf.c
+++ b/drivers/staging/media/imx/imx-ic-prpencvf.c
@@ -484,7 +484,7 @@ static int prp_setup_rotation(struct prp_priv *priv)
ret = ipu_ic_task_init(priv->ic,
infmt->width, infmt->height,
outfmt->height, outfmt->width,
- incc->cs, outcc->cs);
+ incc->cs, outcc->cs, outfmt->ycbcr_enc);
if (ret) {
v4l2_err(&ic_priv->sd, "ipu_ic_task_init failed, %d\n", ret);
goto free_rot1;
@@ -587,7 +587,7 @@ static int prp_setup_norotation(struct prp_priv *priv)
ret = ipu_ic_task_init(priv->ic,
infmt->width, infmt->height,
outfmt->width, outfmt->height,
- incc->cs, outcc->cs);
+ incc->cs, outcc->cs, outfmt->ycbcr_enc);
if (ret) {
v4l2_err(&ic_priv->sd, "ipu_ic_task_init failed, %d\n", ret);
return ret;
diff --git a/include/video/imx-ipu-v3.h b/include/video/imx-ipu-v3.h
index c887f4bee5f8..b19d1e23eece 100644
--- a/include/video/imx-ipu-v3.h
+++ b/include/video/imx-ipu-v3.h
@@ -391,15 +391,18 @@ int ipu_ic_task_init(struct ipu_ic *ic,
int in_width, int in_height,
int out_width, int out_height,
enum ipu_color_space in_cs,
- enum ipu_color_space out_cs);
+ enum ipu_color_space out_cs,
+ enum v4l2_ycbcr_encoding encoding);
int ipu_ic_task_init_rsc(struct ipu_ic *ic,
int in_width, int in_height,
int out_width, int out_height,
enum ipu_color_space in_cs,
enum ipu_color_space out_cs,
+ enum v4l2_ycbcr_encoding encoding,
u32 rsc);
int ipu_ic_task_graphics_init(struct ipu_ic *ic,
enum ipu_color_space in_g_cs,
+ enum v4l2_ycbcr_encoding encoding,
bool galpha_en, u32 galpha,
bool colorkey_en, u32 colorkey);
void ipu_ic_task_enable(struct ipu_ic *ic);
--
2.17.1
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