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drm/sun4i: Move the BT.601 CSC coefficients to the frontend

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Both the backend and the frontend need the BT.601 CSC coefficients for
YUV to RGB conversion. Since the backend has a dependency on the
frontend (and not the other way round), move the coefficients there
so that both can access them without having to duplicate them.

Signed-off-by: Paul Kocialkowski <paul.kocialkowski@bootlin.com>
Acked-by: Maxime Ripard <maxime.ripard@bootlin.com>
Signed-off-by: Maxime Ripard <maxime.ripard@bootlin.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20190118145133.21281-7-paul.kocialkowski@bootlin.com
This commit is contained in:
Paul Kocialkowski 2019-01-18 15:51:16 +01:00 committed by Maxime Ripard
parent 1b89dba5f7
commit e6ae40bd94
No known key found for this signature in database
GPG Key ID: E3EF0D6F671851C5
3 changed files with 24 additions and 22 deletions
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22
drivers/gpu/drm/sun4i/sun4i_backend.c
View File

@ -45,28 +45,6 @@ static const u32 sunxi_rgb2yuv_coef[12] = {
0x000001c1, 0x00003e88, 0x00003fb8, 0x00000808
};
/*
* These coefficients are taken from the A33 BSP from Allwinner.
*
* The first three values of each row are coded as 13-bit signed fixed-point
* numbers, with 10 bits for the fractional part. The fourth value is a
* constant coded as a 14-bit signed fixed-point number with 4 bits for the
* fractional part.
*
* The values in table order give the following colorspace translation:
* G = 1.164 * Y - 0.391 * U - 0.813 * V + 135
* R = 1.164 * Y + 1.596 * V - 222
* B = 1.164 * Y + 2.018 * U + 276
*
* This seems to be a conversion from Y[16:235] UV[16:240] to RGB[0:255],
* following the BT601 spec.
*/
static const u32 sunxi_bt601_yuv2rgb_coef[12] = {
0x000004a7, 0x00001e6f, 0x00001cbf, 0x00000877,
0x000004a7, 0x00000000, 0x00000662, 0x00003211,
0x000004a7, 0x00000812, 0x00000000, 0x00002eb1,
};
static void sun4i_backend_apply_color_correction(struct sunxi_engine *engine)
{
int i;

23
drivers/gpu/drm/sun4i/sun4i_frontend.c
View File

@ -48,6 +48,29 @@ static const u32 sun4i_frontend_horz_coef[64] = {
0x03ff0000, 0x0000fd41, 0x01ff0000, 0x0000fe42,
};
/*
* These coefficients are taken from the A33 BSP from Allwinner.
*
* The first three values of each row are coded as 13-bit signed fixed-point
* numbers, with 10 bits for the fractional part. The fourth value is a
* constant coded as a 14-bit signed fixed-point number with 4 bits for the
* fractional part.
*
* The values in table order give the following colorspace translation:
* G = 1.164 * Y - 0.391 * U - 0.813 * V + 135
* R = 1.164 * Y + 1.596 * V - 222
* B = 1.164 * Y + 2.018 * U + 276
*
* This seems to be a conversion from Y[16:235] UV[16:240] to RGB[0:255],
* following the BT601 spec.
*/
const u32 sunxi_bt601_yuv2rgb_coef[12] = {
0x000004a7, 0x00001e6f, 0x00001cbf, 0x00000877,
0x000004a7, 0x00000000, 0x00000662, 0x00003211,
0x000004a7, 0x00000812, 0x00000000, 0x00002eb1,
};
EXPORT_SYMBOL(sunxi_bt601_yuv2rgb_coef);
static void sun4i_frontend_scaler_init(struct sun4i_frontend *frontend)
{
int i;

1
drivers/gpu/drm/sun4i/sun4i_frontend.h
View File

@ -86,6 +86,7 @@ struct sun4i_frontend {
};
extern const struct of_device_id sun4i_frontend_of_table[];
extern const u32 sunxi_bt601_yuv2rgb_coef[12];
int sun4i_frontend_init(struct sun4i_frontend *frontend);
void sun4i_frontend_exit(struct sun4i_frontend *frontend);