IPI_COLOR_DEPTH
grf_field_write(dsi2, IPI_COLOR_DEPTH, color_depth);
[IPI_COLOR_DEPTH] = { 0x0028, 8, 11 },
[IPI_COLOR_DEPTH] = { 0x0000, 4, 7 },
[IPI_COLOR_DEPTH] = { 0x0004, 4, 7 },