[PATCH 8/8] drm/fourcc: Add DRM_FORMAT_D1

[Geert Uytterhoeven]

Introduce a fourcc code for a single-channel frame buffer format with two
darkness levels.  This can be used for two-level dark-on-light displays.

As the number of bits per pixel is less than eight, this relies on
proper block handling for the calculation of bits per pixel and pitch.

Signed-off-by: Geert Uytterhoeven <geert@xxxxxxxxxxxxxx>
---
 drivers/gpu/drm/drm_fourcc.c  | 2 ++
 include/uapi/drm/drm_fourcc.h | 3 +++
 2 files changed, 5 insertions(+)

diff --git a/drivers/gpu/drm/drm_fourcc.c b/drivers/gpu/drm/drm_fourcc.c
index c12e48ecb1ab8aad..d00ce5d8d1fb9dd3 100644
--- a/drivers/gpu/drm/drm_fourcc.c
+++ b/drivers/gpu/drm/drm_fourcc.c
@@ -151,6 +151,8 @@ const struct drm_format_info *__drm_format_info(u32 format)
 		{ .format = DRM_FORMAT_C4,		.depth = 4,  .num_planes = 1,
 		  .char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
 		{ .format = DRM_FORMAT_C8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
+		{ .format = DRM_FORMAT_D1,		.depth = 1,  .num_planes = 1,
+		  .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
 		{ .format = DRM_FORMAT_R1,		.depth = 1,  .num_planes = 1,
 		  .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
 		{ .format = DRM_FORMAT_R2,		.depth = 2,  .num_planes = 1,
diff --git a/include/uapi/drm/drm_fourcc.h b/include/uapi/drm/drm_fourcc.h
index 8605a1acc6813e6c..c15c6efcc65e5827 100644
--- a/include/uapi/drm/drm_fourcc.h
+++ b/include/uapi/drm/drm_fourcc.h
@@ -104,6 +104,9 @@ extern "C" {
 #define DRM_FORMAT_C4		fourcc_code('C', '4', ' ', ' ') /* [3:0] C */
 #define DRM_FORMAT_C8		fourcc_code('C', '8', ' ', ' ') /* [7:0] C */
 
+/* 1 bpp Darkness */
+#define DRM_FORMAT_D1		fourcc_code('D', '1', ' ', ' ') /* [0] D */
+
 /* 1 bpp Red */
 #define DRM_FORMAT_R1		fourcc_code('R', '1', ' ', ' ') /* [0] R */
 
-- 
2.25.1