1 /*
2  * Copyright (c) 2016 Laurent Pinchart <laurent.pinchart@ideasonboard.com>
3  *
4  * DRM core format related functions
5  *
6  * Permission to use, copy, modify, distribute, and sell this software and its
7  * documentation for any purpose is hereby granted without fee, provided that
8  * the above copyright notice appear in all copies and that both that copyright
9  * notice and this permission notice appear in supporting documentation, and
10  * that the name of the copyright holders not be used in advertising or
11  * publicity pertaining to distribution of the software without specific,
12  * written prior permission.  The copyright holders make no representations
13  * about the suitability of this software for any purpose.  It is provided "as
14  * is" without express or implied warranty.
15  *
16  * THE COPYRIGHT HOLDERS DISCLAIM ALL WARRANTIES WITH REGARD TO THIS SOFTWARE,
17  * INCLUDING ALL IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS, IN NO
18  * EVENT SHALL THE COPYRIGHT HOLDERS BE LIABLE FOR ANY SPECIAL, INDIRECT OR
19  * CONSEQUENTIAL DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE,
20  * DATA OR PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER
21  * TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR PERFORMANCE
22  * OF THIS SOFTWARE.
23  */
24 
25 #include <linux/bug.h>
26 #include <linux/ctype.h>
27 #include <linux/export.h>
28 #include <linux/kernel.h>
29 
30 #include <drm/drm_device.h>
31 #include <drm/drm_fourcc.h>
32 
33 /**
34  * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
35  * @bpp: bits per pixels
36  * @depth: bit depth per pixel
37  *
38  * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
39  * Useful in fbdev emulation code, since that deals in those values.
40  */
drm_mode_legacy_fb_format(uint32_t bpp,uint32_t depth)41 uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
42 {
43 	uint32_t fmt = DRM_FORMAT_INVALID;
44 
45 	switch (bpp) {
46 	case 1:
47 		if (depth == 1)
48 			fmt = DRM_FORMAT_C1;
49 		break;
50 
51 	case 2:
52 		if (depth == 2)
53 			fmt = DRM_FORMAT_C2;
54 		break;
55 
56 	case 4:
57 		if (depth == 4)
58 			fmt = DRM_FORMAT_C4;
59 		break;
60 
61 	case 8:
62 		if (depth == 8)
63 			fmt = DRM_FORMAT_C8;
64 		break;
65 
66 	case 16:
67 		switch (depth) {
68 		case 15:
69 			fmt = DRM_FORMAT_XRGB1555;
70 			break;
71 		case 16:
72 			fmt = DRM_FORMAT_RGB565;
73 			break;
74 		default:
75 			break;
76 		}
77 		break;
78 
79 	case 24:
80 		if (depth == 24)
81 			fmt = DRM_FORMAT_RGB888;
82 		break;
83 
84 	case 32:
85 		switch (depth) {
86 		case 24:
87 			fmt = DRM_FORMAT_XRGB8888;
88 			break;
89 		case 30:
90 			fmt = DRM_FORMAT_XRGB2101010;
91 			break;
92 		case 32:
93 			fmt = DRM_FORMAT_ARGB8888;
94 			break;
95 		default:
96 			break;
97 		}
98 		break;
99 
100 	default:
101 		break;
102 	}
103 
104 	return fmt;
105 }
106 EXPORT_SYMBOL(drm_mode_legacy_fb_format);
107 
108 /**
109  * drm_driver_legacy_fb_format - compute drm fourcc code from legacy description
110  * @dev: DRM device
111  * @bpp: bits per pixels
112  * @depth: bit depth per pixel
113  *
114  * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
115  * Unlike drm_mode_legacy_fb_format() this looks at the drivers mode_config,
116  * and depending on the &drm_mode_config.quirk_addfb_prefer_host_byte_order flag
117  * it returns little endian byte order or host byte order framebuffer formats.
118  */
drm_driver_legacy_fb_format(struct drm_device * dev,uint32_t bpp,uint32_t depth)119 uint32_t drm_driver_legacy_fb_format(struct drm_device *dev,
120 				     uint32_t bpp, uint32_t depth)
121 {
122 	uint32_t fmt = drm_mode_legacy_fb_format(bpp, depth);
123 
124 	if (dev->mode_config.quirk_addfb_prefer_host_byte_order) {
125 		if (fmt == DRM_FORMAT_XRGB8888)
126 			fmt = DRM_FORMAT_HOST_XRGB8888;
127 		if (fmt == DRM_FORMAT_ARGB8888)
128 			fmt = DRM_FORMAT_HOST_ARGB8888;
129 		if (fmt == DRM_FORMAT_RGB565)
130 			fmt = DRM_FORMAT_HOST_RGB565;
131 		if (fmt == DRM_FORMAT_XRGB1555)
132 			fmt = DRM_FORMAT_HOST_XRGB1555;
133 	}
134 
135 	if (dev->mode_config.quirk_addfb_prefer_xbgr_30bpp &&
136 	    fmt == DRM_FORMAT_XRGB2101010)
137 		fmt = DRM_FORMAT_XBGR2101010;
138 
139 	return fmt;
140 }
141 EXPORT_SYMBOL(drm_driver_legacy_fb_format);
142 
143 /*
144  * Internal function to query information for a given format. See
145  * drm_format_info() for the public API.
146  */
__drm_format_info(u32 format)147 const struct drm_format_info *__drm_format_info(u32 format)
148 {
149 	static const struct drm_format_info formats[] = {
150 		{ .format = DRM_FORMAT_C1,		.depth = 1,  .num_planes = 1,
151 		  .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
152 		{ .format = DRM_FORMAT_C2,		.depth = 2,  .num_planes = 1,
153 		  .char_per_block = { 1, }, .block_w = { 4, }, .block_h = { 1, }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
154 		{ .format = DRM_FORMAT_C4,		.depth = 4,  .num_planes = 1,
155 		  .char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
156 		{ .format = DRM_FORMAT_C8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1, .is_color_indexed = true },
157 		{ .format = DRM_FORMAT_D1,		.depth = 1,  .num_planes = 1,
158 		  .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
159 		{ .format = DRM_FORMAT_D2,		.depth = 2,  .num_planes = 1,
160 		  .char_per_block = { 1, }, .block_w = { 4, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
161 		{ .format = DRM_FORMAT_D4,		.depth = 4,  .num_planes = 1,
162 		  .char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
163 		{ .format = DRM_FORMAT_D8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
164 		{ .format = DRM_FORMAT_R1,		.depth = 1,  .num_planes = 1,
165 		  .char_per_block = { 1, }, .block_w = { 8, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
166 		{ .format = DRM_FORMAT_R2,		.depth = 2,  .num_planes = 1,
167 		  .char_per_block = { 1, }, .block_w = { 4, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
168 		{ .format = DRM_FORMAT_R4,		.depth = 4,  .num_planes = 1,
169 		  .char_per_block = { 1, }, .block_w = { 2, }, .block_h = { 1, }, .hsub = 1, .vsub = 1 },
170 		{ .format = DRM_FORMAT_R8,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
171 		{ .format = DRM_FORMAT_R10,		.depth = 10, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
172 		{ .format = DRM_FORMAT_R12,		.depth = 12, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
173 		{ .format = DRM_FORMAT_RGB332,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
174 		{ .format = DRM_FORMAT_BGR233,		.depth = 8,  .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
175 		{ .format = DRM_FORMAT_XRGB4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
176 		{ .format = DRM_FORMAT_XBGR4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
177 		{ .format = DRM_FORMAT_RGBX4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
178 		{ .format = DRM_FORMAT_BGRX4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
179 		{ .format = DRM_FORMAT_ARGB4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
180 		{ .format = DRM_FORMAT_ABGR4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
181 		{ .format = DRM_FORMAT_RGBA4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
182 		{ .format = DRM_FORMAT_BGRA4444,	.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
183 		{ .format = DRM_FORMAT_XRGB1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
184 		{ .format = DRM_FORMAT_XBGR1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
185 		{ .format = DRM_FORMAT_RGBX5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
186 		{ .format = DRM_FORMAT_BGRX5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
187 		{ .format = DRM_FORMAT_ARGB1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
188 		{ .format = DRM_FORMAT_ABGR1555,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
189 		{ .format = DRM_FORMAT_RGBA5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
190 		{ .format = DRM_FORMAT_BGRA5551,	.depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
191 		{ .format = DRM_FORMAT_RGB565,		.depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
192 		{ .format = DRM_FORMAT_BGR565,		.depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
193 #ifdef __BIG_ENDIAN
194 		{ .format = DRM_FORMAT_XRGB1555 | DRM_FORMAT_BIG_ENDIAN, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
195 		{ .format = DRM_FORMAT_RGB565 | DRM_FORMAT_BIG_ENDIAN, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
196 #endif
197 		{ .format = DRM_FORMAT_RGB888,		.depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
198 		{ .format = DRM_FORMAT_BGR888,		.depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
199 		{ .format = DRM_FORMAT_XRGB8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
200 		{ .format = DRM_FORMAT_XBGR8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
201 		{ .format = DRM_FORMAT_RGBX8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
202 		{ .format = DRM_FORMAT_BGRX8888,	.depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
203 		{ .format = DRM_FORMAT_RGB565_A8,	.depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
204 		{ .format = DRM_FORMAT_BGR565_A8,	.depth = 24, .num_planes = 2, .cpp = { 2, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
205 		{ .format = DRM_FORMAT_XRGB2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
206 		{ .format = DRM_FORMAT_XBGR2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
207 		{ .format = DRM_FORMAT_RGBX1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
208 		{ .format = DRM_FORMAT_BGRX1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
209 		{ .format = DRM_FORMAT_ARGB2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
210 		{ .format = DRM_FORMAT_ABGR2101010,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
211 		{ .format = DRM_FORMAT_RGBA1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
212 		{ .format = DRM_FORMAT_BGRA1010102,	.depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
213 		{ .format = DRM_FORMAT_ARGB8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
214 		{ .format = DRM_FORMAT_ABGR8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
215 		{ .format = DRM_FORMAT_RGBA8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
216 		{ .format = DRM_FORMAT_BGRA8888,	.depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
217 		{ .format = DRM_FORMAT_XRGB16161616F,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1 },
218 		{ .format = DRM_FORMAT_XBGR16161616F,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1 },
219 		{ .format = DRM_FORMAT_ARGB16161616F,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
220 		{ .format = DRM_FORMAT_ABGR16161616F,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
221 		{ .format = DRM_FORMAT_AXBXGXRX106106106106, .depth = 0, .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
222 		{ .format = DRM_FORMAT_XRGB16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1 },
223 		{ .format = DRM_FORMAT_XBGR16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1 },
224 		{ .format = DRM_FORMAT_ARGB16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
225 		{ .format = DRM_FORMAT_ABGR16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
226 		{ .format = DRM_FORMAT_RGB888_A8,	.depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
227 		{ .format = DRM_FORMAT_BGR888_A8,	.depth = 32, .num_planes = 2, .cpp = { 3, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
228 		{ .format = DRM_FORMAT_XRGB8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
229 		{ .format = DRM_FORMAT_XBGR8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
230 		{ .format = DRM_FORMAT_RGBX8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
231 		{ .format = DRM_FORMAT_BGRX8888_A8,	.depth = 32, .num_planes = 2, .cpp = { 4, 1, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true },
232 		{ .format = DRM_FORMAT_YUV410,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
233 		{ .format = DRM_FORMAT_YVU410,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4, .is_yuv = true },
234 		{ .format = DRM_FORMAT_YUV411,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
235 		{ .format = DRM_FORMAT_YVU411,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1, .is_yuv = true },
236 		{ .format = DRM_FORMAT_YUV420,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
237 		{ .format = DRM_FORMAT_YVU420,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2, .is_yuv = true },
238 		{ .format = DRM_FORMAT_YUV422,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
239 		{ .format = DRM_FORMAT_YVU422,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1, .is_yuv = true },
240 		{ .format = DRM_FORMAT_YUV444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
241 		{ .format = DRM_FORMAT_YVU444,		.depth = 0,  .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1, .is_yuv = true },
242 		{ .format = DRM_FORMAT_NV12,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
243 		{ .format = DRM_FORMAT_NV21,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2, .is_yuv = true },
244 		{ .format = DRM_FORMAT_NV16,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
245 		{ .format = DRM_FORMAT_NV61,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
246 		{ .format = DRM_FORMAT_NV24,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
247 		{ .format = DRM_FORMAT_NV42,		.depth = 0,  .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
248 		{ .format = DRM_FORMAT_YUYV,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
249 		{ .format = DRM_FORMAT_YVYU,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
250 		{ .format = DRM_FORMAT_UYVY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
251 		{ .format = DRM_FORMAT_VYUY,		.depth = 0,  .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
252 		{ .format = DRM_FORMAT_XYUV8888,	.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
253 		{ .format = DRM_FORMAT_VUY888,          .depth = 0,  .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
254 		{ .format = DRM_FORMAT_AYUV,		.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
255 		{ .format = DRM_FORMAT_Y210,            .depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
256 		{ .format = DRM_FORMAT_Y212,            .depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
257 		{ .format = DRM_FORMAT_Y216,            .depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 2, .vsub = 1, .is_yuv = true },
258 		{ .format = DRM_FORMAT_Y410,            .depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
259 		{ .format = DRM_FORMAT_Y412,            .depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
260 		{ .format = DRM_FORMAT_Y416,            .depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .has_alpha = true, .is_yuv = true },
261 		{ .format = DRM_FORMAT_XVYU2101010,	.depth = 0,  .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
262 		{ .format = DRM_FORMAT_XVYU12_16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
263 		{ .format = DRM_FORMAT_XVYU16161616,	.depth = 0,  .num_planes = 1, .cpp = { 8, 0, 0 }, .hsub = 1, .vsub = 1, .is_yuv = true },
264 		{ .format = DRM_FORMAT_Y0L0,		.depth = 0,  .num_planes = 1,
265 		  .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
266 		  .hsub = 2, .vsub = 2, .has_alpha = true, .is_yuv = true },
267 		{ .format = DRM_FORMAT_X0L0,		.depth = 0,  .num_planes = 1,
268 		  .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
269 		  .hsub = 2, .vsub = 2, .is_yuv = true },
270 		{ .format = DRM_FORMAT_Y0L2,		.depth = 0,  .num_planes = 1,
271 		  .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
272 		  .hsub = 2, .vsub = 2, .has_alpha = true, .is_yuv = true },
273 		{ .format = DRM_FORMAT_X0L2,		.depth = 0,  .num_planes = 1,
274 		  .char_per_block = { 8, 0, 0 }, .block_w = { 2, 0, 0 }, .block_h = { 2, 0, 0 },
275 		  .hsub = 2, .vsub = 2, .is_yuv = true },
276 		{ .format = DRM_FORMAT_P010,            .depth = 0,  .num_planes = 2,
277 		  .char_per_block = { 2, 4, 0 }, .block_w = { 1, 1, 0 }, .block_h = { 1, 1, 0 },
278 		  .hsub = 2, .vsub = 2, .is_yuv = true},
279 		{ .format = DRM_FORMAT_P012,		.depth = 0,  .num_planes = 2,
280 		  .char_per_block = { 2, 4, 0 }, .block_w = { 1, 1, 0 }, .block_h = { 1, 1, 0 },
281 		   .hsub = 2, .vsub = 2, .is_yuv = true},
282 		{ .format = DRM_FORMAT_P016,		.depth = 0,  .num_planes = 2,
283 		  .char_per_block = { 2, 4, 0 }, .block_w = { 1, 1, 0 }, .block_h = { 1, 1, 0 },
284 		  .hsub = 2, .vsub = 2, .is_yuv = true},
285 		{ .format = DRM_FORMAT_P210,		.depth = 0,
286 		  .num_planes = 2, .char_per_block = { 2, 4, 0 },
287 		  .block_w = { 1, 1, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
288 		  .vsub = 1, .is_yuv = true },
289 		{ .format = DRM_FORMAT_VUY101010,	.depth = 0,
290 		  .num_planes = 1, .cpp = { 0, 0, 0 }, .hsub = 1, .vsub = 1,
291 		  .is_yuv = true },
292 		{ .format = DRM_FORMAT_YUV420_8BIT,     .depth = 0,
293 		  .num_planes = 1, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 2,
294 		  .is_yuv = true },
295 		{ .format = DRM_FORMAT_YUV420_10BIT,    .depth = 0,
296 		  .num_planes = 1, .cpp = { 0, 0, 0 }, .hsub = 2, .vsub = 2,
297 		  .is_yuv = true },
298 		{ .format = DRM_FORMAT_NV15,		.depth = 0,
299 		  .num_planes = 2, .char_per_block = { 5, 5, 0 },
300 		  .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
301 		  .vsub = 2, .is_yuv = true },
302 		{ .format = DRM_FORMAT_Q410,		.depth = 0,
303 		  .num_planes = 3, .char_per_block = { 2, 2, 2 },
304 		  .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 1,
305 		  .vsub = 1, .is_yuv = true },
306 		{ .format = DRM_FORMAT_Q401,		.depth = 0,
307 		  .num_planes = 3, .char_per_block = { 2, 2, 2 },
308 		  .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 1,
309 		  .vsub = 1, .is_yuv = true },
310 		{ .format = DRM_FORMAT_P030,            .depth = 0,  .num_planes = 2,
311 		  .char_per_block = { 4, 8, 0 }, .block_w = { 3, 3, 0 }, .block_h = { 1, 1, 0 },
312 		  .hsub = 2, .vsub = 2, .is_yuv = true},
313 	};
314 
315 	unsigned int i;
316 
317 	for (i = 0; i < ARRAY_SIZE(formats); ++i) {
318 		if (formats[i].format == format)
319 			return &formats[i];
320 	}
321 
322 	return NULL;
323 }
324 
325 /**
326  * drm_format_info - query information for a given format
327  * @format: pixel format (DRM_FORMAT_*)
328  *
329  * The caller should only pass a supported pixel format to this function.
330  * Unsupported pixel formats will generate a warning in the kernel log.
331  *
332  * Returns:
333  * The instance of struct drm_format_info that describes the pixel format, or
334  * NULL if the format is unsupported.
335  */
drm_format_info(u32 format)336 const struct drm_format_info *drm_format_info(u32 format)
337 {
338 	const struct drm_format_info *info;
339 
340 	info = __drm_format_info(format);
341 	WARN_ON(!info);
342 	return info;
343 }
344 EXPORT_SYMBOL(drm_format_info);
345 
346 /**
347  * drm_get_format_info - query information for a given framebuffer configuration
348  * @dev: DRM device
349  * @mode_cmd: metadata from the userspace fb creation request
350  *
351  * Returns:
352  * The instance of struct drm_format_info that describes the pixel format, or
353  * NULL if the format is unsupported.
354  */
355 const struct drm_format_info *
drm_get_format_info(struct drm_device * dev,const struct drm_mode_fb_cmd2 * mode_cmd)356 drm_get_format_info(struct drm_device *dev,
357 		    const struct drm_mode_fb_cmd2 *mode_cmd)
358 {
359 	const struct drm_format_info *info = NULL;
360 
361 	if (dev->mode_config.funcs->get_format_info)
362 		info = dev->mode_config.funcs->get_format_info(mode_cmd);
363 
364 	if (!info)
365 		info = drm_format_info(mode_cmd->pixel_format);
366 
367 	return info;
368 }
369 EXPORT_SYMBOL(drm_get_format_info);
370 
371 /**
372  * drm_format_info_block_width - width in pixels of block.
373  * @info: pixel format info
374  * @plane: plane index
375  *
376  * Returns:
377  * The width in pixels of a block, depending on the plane index.
378  */
drm_format_info_block_width(const struct drm_format_info * info,int plane)379 unsigned int drm_format_info_block_width(const struct drm_format_info *info,
380 					 int plane)
381 {
382 	if (!info || plane < 0 || plane >= info->num_planes)
383 		return 0;
384 
385 	if (!info->block_w[plane])
386 		return 1;
387 	return info->block_w[plane];
388 }
389 EXPORT_SYMBOL(drm_format_info_block_width);
390 
391 /**
392  * drm_format_info_block_height - height in pixels of a block
393  * @info: pixel format info
394  * @plane: plane index
395  *
396  * Returns:
397  * The height in pixels of a block, depending on the plane index.
398  */
drm_format_info_block_height(const struct drm_format_info * info,int plane)399 unsigned int drm_format_info_block_height(const struct drm_format_info *info,
400 					  int plane)
401 {
402 	if (!info || plane < 0 || plane >= info->num_planes)
403 		return 0;
404 
405 	if (!info->block_h[plane])
406 		return 1;
407 	return info->block_h[plane];
408 }
409 EXPORT_SYMBOL(drm_format_info_block_height);
410 
411 /**
412  * drm_format_info_bpp - number of bits per pixel
413  * @info: pixel format info
414  * @plane: plane index
415  *
416  * Returns:
417  * The actual number of bits per pixel, depending on the plane index.
418  */
drm_format_info_bpp(const struct drm_format_info * info,int plane)419 unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane)
420 {
421 	if (!info || plane < 0 || plane >= info->num_planes)
422 		return 0;
423 
424 	return info->char_per_block[plane] * 8 /
425 	       (drm_format_info_block_width(info, plane) *
426 		drm_format_info_block_height(info, plane));
427 }
428 EXPORT_SYMBOL(drm_format_info_bpp);
429 
430 /**
431  * drm_format_info_min_pitch - computes the minimum required pitch in bytes
432  * @info: pixel format info
433  * @plane: plane index
434  * @buffer_width: buffer width in pixels
435  *
436  * Returns:
437  * The minimum required pitch in bytes for a buffer by taking into consideration
438  * the pixel format information and the buffer width.
439  */
drm_format_info_min_pitch(const struct drm_format_info * info,int plane,unsigned int buffer_width)440 uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
441 				   int plane, unsigned int buffer_width)
442 {
443 	if (!info || plane < 0 || plane >= info->num_planes)
444 		return 0;
445 
446 	return DIV_ROUND_UP_ULL((u64)buffer_width * info->char_per_block[plane],
447 			    drm_format_info_block_width(info, plane) *
448 			    drm_format_info_block_height(info, plane));
449 }
450 EXPORT_SYMBOL(drm_format_info_min_pitch);
451