Re: [PATCH 1/3] drm: Add Y2xx and Y4xx (xx:10/12/16) format definitions and fourcc

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On 11-Jan-19 6:17 PM, Juha-Pekka Heikkila wrote:
On 11.1.2019 7.30, swati2.sharma@xxxxxxxxx wrote:
From: Swati Sharma <swati2.sharma@xxxxxxxxx>

The following pixel formats are packed format that follows 4:2:2
chroma sampling. For memory represenation each component is
allocated 16 bits each. Thus each pixel occupies 32bit.

Y210:    For each component, valid data occupies MSB 10 bits.
    LSB 6 bits are filled with zeroes.
Y212:    For each component, valid data occupies MSB 12 bits.
    LSB 4 bits are filled with zeroes.
Y216:    For each component valid data occupies 16 bits,
    doesn't require any padding bits.

First 16 bits stores the Y value and the next 16 bits stores one
of the chroma samples alternatively. The first luma sample will
be accompanied by first U sample and second luma sample is
accompanied by the first V sample.

The following pixel formats are packed format that follows 4:4:4
chroma sampling. Channels are arranged in the order UYVA in
increasing memory order.

Y410:    Each color component occupies 10 bits and X component
    takes 2 bits, thus each pixel occupies 32 bits.
Y412:   Each color component is 16 bits where valid data
    occupies MSB 12 bits. LSB 4 bits are filled with zeroes.
    Thus, each pixel occupies 64 bits.
Y416:   Each color component occupies 16 bits for valid data,
    doesn't require any padding bits. Thus, each pixel
    occupies 64 bits.

Signed-off-by: Swati Sharma <swati2.sharma@xxxxxxxxx>
---
  drivers/gpu/drm/drm_fourcc.c  |  6 ++++++
  include/uapi/drm/drm_fourcc.h | 18 +++++++++++++++++-
  2 files changed, 23 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index d90ee03..639ab93 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -226,6 +226,12 @@ const struct drm_format_info *__drm_format_info(u32 format)           { .format = DRM_FORMAT_VYUY,        .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },           { .format = DRM_FORMAT_XYUV8888,    .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },           { .format = DRM_FORMAT_AYUV,        .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true }, +        { .format = DRM_FORMAT_Y210,            .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true }, +        { .format = DRM_FORMAT_Y212,            .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true }, +        { .format = DRM_FORMAT_Y216,            .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true }, +        { .format = DRM_FORMAT_Y410,            .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true }, +        { .format = DRM_FORMAT_Y412,            .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true }, +        { .format = DRM_FORMAT_Y416,            .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },           { .format = DRM_FORMAT_Y0L0,        .depth = 0, .num_planes = 1,             .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
            .hsub = 2, .vsub = 2, .has_alpha = true, .is_yuv = true },
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 0b44260..97249a5 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -151,7 +151,23 @@
  #define DRM_FORMAT_VYUY        fourcc_code('V', 'Y', 'U', 'Y') /* [31:0] Y1:Cb0:Y0:Cr0 8:8:8:8 little endian */     #define DRM_FORMAT_AYUV        fourcc_code('A', 'Y', 'U', 'V') /* [31:0] A:Y:Cb:Cr 8:8:8:8 little endian */ -#define DRM_FORMAT_XYUV8888        fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */ +#define DRM_FORMAT_XYUV8888    fourcc_code('X', 'Y', 'U', 'V') /* [31:0] X:Y:Cb:Cr 8:8:8:8 little endian */
+
+/*
+ * packed Y2xx indicate for each component, xx valid data occupy msb
+ * 16-xx padding occupy lsb
+ */
+#define DRM_FORMAT_Y210         fourcc_code('Y', '2', '1', '0') /* [63:0] Y0:x:Cb0:x:Y1:x:Cr1:x 10:6:10:6:10:6:10:6 little endian */ +#define DRM_FORMAT_Y212         fourcc_code('Y', '2', '1', '2') /* [63:0] Y0:x:Cb0:x:Y1:x:Cr1:x 12:4:12:4:12:4:12:4 little endian */ +#define DRM_FORMAT_Y216         fourcc_code('Y', '2', '1', '6') /* [63:0] Y0:Cb0:Y1:Cr1 16:16:16:16 little endian */
+
+/*
+ * packed Y4xx indicate for each component, xx valid data occupy msb
+ * 16-xx padding occupy lsb except Y410
+ */
+#define DRM_FORMAT_Y410         fourcc_code('Y', '4', '1', '0') /* [31:0] X:V:Y:U 2:10:10:10 little endian */ +#define DRM_FORMAT_Y412         fourcc_code('Y', '4', '1', '2') /* [64:0] X:x:V:x:Y:x:U:x 12:4:12:4:12:4:12:4 little endian */ +#define DRM_FORMAT_Y416         fourcc_code('Y', '4', '1', '6') /* [64:0] X:V:Y:U 16:16:16:16 little endian */
^^
[63:0] maybe?
ohh sorry. Will correct in next patch series.

/Juha-Pekka

    /*
   * packed YCbCr420 2x2 tiled formats



--
Thanks and Regards,
Swati

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