Add FourCC definitions for the 48-bit RGB/BGR formats to the
DRM/KMS uapi.

The format will be used by the Raspberry Pi PiSP Back End,
supported by a V4L2 driver in kernel space and by libcamera in
userspace, which uses the DRM FourCC identifiers.

Signed-off-by: Jacopo Mondi <jacopo.mo...@ideasonboard.com>
---
 drivers/gpu/drm/drm_fourcc.c  | 8 ++++++++
 include/uapi/drm/drm_fourcc.h | 4 ++++
 2 files changed, 12 insertions(+)

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index 193cf8ed7912..908f20b96fd5 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -210,6 +210,14 @@ const struct drm_format_info *__drm_format_info(u32 format)
                { .format = DRM_FORMAT_ABGR2101010,     .depth = 30, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
                { .format = DRM_FORMAT_RGBA1010102,     .depth = 30, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
                { .format = DRM_FORMAT_BGRA1010102,     .depth = 30, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
+               { .format = DRM_FORMAT_RGB161616,       .depth = 0,
+                 .num_planes = 1, .char_per_block = { 6, 0, 0 },
+                 .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 },
+                 .hsub = 1, .vsub = 1, .has_alpha = false },
+               { .format = DRM_FORMAT_BGR161616,       .depth = 0,
+                 .num_planes = 1, .char_per_block = { 6, 0, 0 },
+                 .block_w = { 1, 0, 0 }, .block_h = { 1, 0, 0 },
+                 .hsub = 1, .vsub = 1, .has_alpha = false },
                { .format = DRM_FORMAT_ARGB8888,        .depth = 32, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
                { .format = DRM_FORMAT_ABGR8888,        .depth = 32, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
                { .format = DRM_FORMAT_RGBA8888,        .depth = 32, 
.num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 84d502e42961..00db00083175 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -210,6 +210,10 @@ extern "C" {
 #define DRM_FORMAT_RGBA1010102 fourcc_code('R', 'A', '3', '0') /* [31:0] 
R:G:B:A 10:10:10:2 little endian */
 #define DRM_FORMAT_BGRA1010102 fourcc_code('B', 'A', '3', '0') /* [31:0] 
B:G:R:A 10:10:10:2 little endian */

+/* 48 bpp RGB */
+#define DRM_FORMAT_RGB161616 fourcc_code('R', 'G', '4', '8') /* [47:0] R:G:B 
16:16:16 little endian */
+#define DRM_FORMAT_BGR161616 fourcc_code('B', 'G', '4', '8') /* [47:0] B:G:R 
16:16:16 little endian */
+
 /* 64 bpp RGB */
 #define DRM_FORMAT_XRGB16161616        fourcc_code('X', 'R', '4', '8') /* 
[63:0] x:R:G:B 16:16:16:16 little endian */
 #define DRM_FORMAT_XBGR16161616        fourcc_code('X', 'B', '4', '8') /* 
[63:0] x:B:G:R 16:16:16:16 little endian */
--
2.43.0

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