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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 */
41uint32_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}
106EXPORT_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 */
119uint32_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}
141EXPORT_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 */
147const 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_NV20, .depth = 0,
303 .num_planes = 2, .char_per_block = { 5, 5, 0 },
304 .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 2,
305 .vsub = 1, .is_yuv = true },
306 { .format = DRM_FORMAT_NV30, .depth = 0,
307 .num_planes = 2, .char_per_block = { 5, 5, 0 },
308 .block_w = { 4, 2, 0 }, .block_h = { 1, 1, 0 }, .hsub = 1,
309 .vsub = 1, .is_yuv = true },
310 { .format = DRM_FORMAT_Q410, .depth = 0,
311 .num_planes = 3, .char_per_block = { 2, 2, 2 },
312 .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 1,
313 .vsub = 1, .is_yuv = true },
314 { .format = DRM_FORMAT_Q401, .depth = 0,
315 .num_planes = 3, .char_per_block = { 2, 2, 2 },
316 .block_w = { 1, 1, 1 }, .block_h = { 1, 1, 1 }, .hsub = 1,
317 .vsub = 1, .is_yuv = true },
318 { .format = DRM_FORMAT_P030, .depth = 0, .num_planes = 2,
319 .char_per_block = { 4, 8, 0 }, .block_w = { 3, 3, 0 }, .block_h = { 1, 1, 0 },
320 .hsub = 2, .vsub = 2, .is_yuv = true},
321 };
322
323 unsigned int i;
324
325 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
326 if (formats[i].format == format)
327 return &formats[i];
328 }
329
330 return NULL;
331}
332
333/**
334 * drm_format_info - query information for a given format
335 * @format: pixel format (DRM_FORMAT_*)
336 *
337 * The caller should only pass a supported pixel format to this function.
338 * Unsupported pixel formats will generate a warning in the kernel log.
339 *
340 * Returns:
341 * The instance of struct drm_format_info that describes the pixel format, or
342 * NULL if the format is unsupported.
343 */
344const struct drm_format_info *drm_format_info(u32 format)
345{
346 const struct drm_format_info *info;
347
348 info = __drm_format_info(format);
349 WARN_ON(!info);
350 return info;
351}
352EXPORT_SYMBOL(drm_format_info);
353
354/**
355 * drm_get_format_info - query information for a given framebuffer configuration
356 * @dev: DRM device
357 * @mode_cmd: metadata from the userspace fb creation request
358 *
359 * Returns:
360 * The instance of struct drm_format_info that describes the pixel format, or
361 * NULL if the format is unsupported.
362 */
363const struct drm_format_info *
364drm_get_format_info(struct drm_device *dev,
365 const struct drm_mode_fb_cmd2 *mode_cmd)
366{
367 const struct drm_format_info *info = NULL;
368
369 if (dev->mode_config.funcs->get_format_info)
370 info = dev->mode_config.funcs->get_format_info(mode_cmd);
371
372 if (!info)
373 info = drm_format_info(mode_cmd->pixel_format);
374
375 return info;
376}
377EXPORT_SYMBOL(drm_get_format_info);
378
379/**
380 * drm_format_info_block_width - width in pixels of block.
381 * @info: pixel format info
382 * @plane: plane index
383 *
384 * Returns:
385 * The width in pixels of a block, depending on the plane index.
386 */
387unsigned int drm_format_info_block_width(const struct drm_format_info *info,
388 int plane)
389{
390 if (!info || plane < 0 || plane >= info->num_planes)
391 return 0;
392
393 if (!info->block_w[plane])
394 return 1;
395 return info->block_w[plane];
396}
397EXPORT_SYMBOL(drm_format_info_block_width);
398
399/**
400 * drm_format_info_block_height - height in pixels of a block
401 * @info: pixel format info
402 * @plane: plane index
403 *
404 * Returns:
405 * The height in pixels of a block, depending on the plane index.
406 */
407unsigned int drm_format_info_block_height(const struct drm_format_info *info,
408 int plane)
409{
410 if (!info || plane < 0 || plane >= info->num_planes)
411 return 0;
412
413 if (!info->block_h[plane])
414 return 1;
415 return info->block_h[plane];
416}
417EXPORT_SYMBOL(drm_format_info_block_height);
418
419/**
420 * drm_format_info_bpp - number of bits per pixel
421 * @info: pixel format info
422 * @plane: plane index
423 *
424 * Returns:
425 * The actual number of bits per pixel, depending on the plane index.
426 */
427unsigned int drm_format_info_bpp(const struct drm_format_info *info, int plane)
428{
429 if (!info || plane < 0 || plane >= info->num_planes)
430 return 0;
431
432 return info->char_per_block[plane] * 8 /
433 (drm_format_info_block_width(info, plane) *
434 drm_format_info_block_height(info, plane));
435}
436EXPORT_SYMBOL(drm_format_info_bpp);
437
438/**
439 * drm_format_info_min_pitch - computes the minimum required pitch in bytes
440 * @info: pixel format info
441 * @plane: plane index
442 * @buffer_width: buffer width in pixels
443 *
444 * Returns:
445 * The minimum required pitch in bytes for a buffer by taking into consideration
446 * the pixel format information and the buffer width.
447 */
448uint64_t drm_format_info_min_pitch(const struct drm_format_info *info,
449 int plane, unsigned int buffer_width)
450{
451 if (!info || plane < 0 || plane >= info->num_planes)
452 return 0;
453
454 return DIV_ROUND_UP_ULL((u64)buffer_width * info->char_per_block[plane],
455 drm_format_info_block_width(info, plane) *
456 drm_format_info_block_height(info, plane));
457}
458EXPORT_SYMBOL(drm_format_info_min_pitch);
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/drmP.h>
31#include <drm/drm_fourcc.h>
32
33static char printable_char(int c)
34{
35 return isascii(c) && isprint(c) ? c : '?';
36}
37
38/**
39 * drm_mode_legacy_fb_format - compute drm fourcc code from legacy description
40 * @bpp: bits per pixels
41 * @depth: bit depth per pixel
42 *
43 * Computes a drm fourcc pixel format code for the given @bpp/@depth values.
44 * Useful in fbdev emulation code, since that deals in those values.
45 */
46uint32_t drm_mode_legacy_fb_format(uint32_t bpp, uint32_t depth)
47{
48 uint32_t fmt;
49
50 switch (bpp) {
51 case 8:
52 fmt = DRM_FORMAT_C8;
53 break;
54 case 16:
55 if (depth == 15)
56 fmt = DRM_FORMAT_XRGB1555;
57 else
58 fmt = DRM_FORMAT_RGB565;
59 break;
60 case 24:
61 fmt = DRM_FORMAT_RGB888;
62 break;
63 case 32:
64 if (depth == 24)
65 fmt = DRM_FORMAT_XRGB8888;
66 else if (depth == 30)
67 fmt = DRM_FORMAT_XRGB2101010;
68 else
69 fmt = DRM_FORMAT_ARGB8888;
70 break;
71 default:
72 DRM_ERROR("bad bpp, assuming x8r8g8b8 pixel format\n");
73 fmt = DRM_FORMAT_XRGB8888;
74 break;
75 }
76
77 return fmt;
78}
79EXPORT_SYMBOL(drm_mode_legacy_fb_format);
80
81/**
82 * drm_get_format_name - fill a string with a drm fourcc format's name
83 * @format: format to compute name of
84 * @buf: caller-supplied buffer
85 */
86const char *drm_get_format_name(uint32_t format, struct drm_format_name_buf *buf)
87{
88 snprintf(buf->str, sizeof(buf->str),
89 "%c%c%c%c %s-endian (0x%08x)",
90 printable_char(format & 0xff),
91 printable_char((format >> 8) & 0xff),
92 printable_char((format >> 16) & 0xff),
93 printable_char((format >> 24) & 0x7f),
94 format & DRM_FORMAT_BIG_ENDIAN ? "big" : "little",
95 format);
96
97 return buf->str;
98}
99EXPORT_SYMBOL(drm_get_format_name);
100
101/*
102 * Internal function to query information for a given format. See
103 * drm_format_info() for the public API.
104 */
105const struct drm_format_info *__drm_format_info(u32 format)
106{
107 static const struct drm_format_info formats[] = {
108 { .format = DRM_FORMAT_C8, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
109 { .format = DRM_FORMAT_RGB332, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
110 { .format = DRM_FORMAT_BGR233, .depth = 8, .num_planes = 1, .cpp = { 1, 0, 0 }, .hsub = 1, .vsub = 1 },
111 { .format = DRM_FORMAT_XRGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
112 { .format = DRM_FORMAT_XBGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
113 { .format = DRM_FORMAT_RGBX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
114 { .format = DRM_FORMAT_BGRX4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
115 { .format = DRM_FORMAT_ARGB4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
116 { .format = DRM_FORMAT_ABGR4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
117 { .format = DRM_FORMAT_RGBA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
118 { .format = DRM_FORMAT_BGRA4444, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
119 { .format = DRM_FORMAT_XRGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
120 { .format = DRM_FORMAT_XBGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
121 { .format = DRM_FORMAT_RGBX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
122 { .format = DRM_FORMAT_BGRX5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
123 { .format = DRM_FORMAT_ARGB1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
124 { .format = DRM_FORMAT_ABGR1555, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
125 { .format = DRM_FORMAT_RGBA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
126 { .format = DRM_FORMAT_BGRA5551, .depth = 15, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
127 { .format = DRM_FORMAT_RGB565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
128 { .format = DRM_FORMAT_BGR565, .depth = 16, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 1, .vsub = 1 },
129 { .format = DRM_FORMAT_RGB888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
130 { .format = DRM_FORMAT_BGR888, .depth = 24, .num_planes = 1, .cpp = { 3, 0, 0 }, .hsub = 1, .vsub = 1 },
131 { .format = DRM_FORMAT_XRGB8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
132 { .format = DRM_FORMAT_XBGR8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
133 { .format = DRM_FORMAT_RGBX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
134 { .format = DRM_FORMAT_BGRX8888, .depth = 24, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
135 { .format = DRM_FORMAT_XRGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
136 { .format = DRM_FORMAT_XBGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
137 { .format = DRM_FORMAT_RGBX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
138 { .format = DRM_FORMAT_BGRX1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
139 { .format = DRM_FORMAT_ARGB2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
140 { .format = DRM_FORMAT_ABGR2101010, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
141 { .format = DRM_FORMAT_RGBA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
142 { .format = DRM_FORMAT_BGRA1010102, .depth = 30, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
143 { .format = DRM_FORMAT_ARGB8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
144 { .format = DRM_FORMAT_ABGR8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
145 { .format = DRM_FORMAT_RGBA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
146 { .format = DRM_FORMAT_BGRA8888, .depth = 32, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
147 { .format = DRM_FORMAT_YUV410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
148 { .format = DRM_FORMAT_YVU410, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 4 },
149 { .format = DRM_FORMAT_YUV411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
150 { .format = DRM_FORMAT_YVU411, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 4, .vsub = 1 },
151 { .format = DRM_FORMAT_YUV420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
152 { .format = DRM_FORMAT_YVU420, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 2 },
153 { .format = DRM_FORMAT_YUV422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
154 { .format = DRM_FORMAT_YVU422, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 2, .vsub = 1 },
155 { .format = DRM_FORMAT_YUV444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
156 { .format = DRM_FORMAT_YVU444, .depth = 0, .num_planes = 3, .cpp = { 1, 1, 1 }, .hsub = 1, .vsub = 1 },
157 { .format = DRM_FORMAT_NV12, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
158 { .format = DRM_FORMAT_NV21, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 2 },
159 { .format = DRM_FORMAT_NV16, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
160 { .format = DRM_FORMAT_NV61, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 2, .vsub = 1 },
161 { .format = DRM_FORMAT_NV24, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
162 { .format = DRM_FORMAT_NV42, .depth = 0, .num_planes = 2, .cpp = { 1, 2, 0 }, .hsub = 1, .vsub = 1 },
163 { .format = DRM_FORMAT_YUYV, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
164 { .format = DRM_FORMAT_YVYU, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
165 { .format = DRM_FORMAT_UYVY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
166 { .format = DRM_FORMAT_VYUY, .depth = 0, .num_planes = 1, .cpp = { 2, 0, 0 }, .hsub = 2, .vsub = 1 },
167 { .format = DRM_FORMAT_AYUV, .depth = 0, .num_planes = 1, .cpp = { 4, 0, 0 }, .hsub = 1, .vsub = 1 },
168 };
169
170 unsigned int i;
171
172 for (i = 0; i < ARRAY_SIZE(formats); ++i) {
173 if (formats[i].format == format)
174 return &formats[i];
175 }
176
177 return NULL;
178}
179
180/**
181 * drm_format_info - query information for a given format
182 * @format: pixel format (DRM_FORMAT_*)
183 *
184 * The caller should only pass a supported pixel format to this function.
185 * Unsupported pixel formats will generate a warning in the kernel log.
186 *
187 * Returns:
188 * The instance of struct drm_format_info that describes the pixel format, or
189 * NULL if the format is unsupported.
190 */
191const struct drm_format_info *drm_format_info(u32 format)
192{
193 const struct drm_format_info *info;
194
195 info = __drm_format_info(format);
196 WARN_ON(!info);
197 return info;
198}
199EXPORT_SYMBOL(drm_format_info);
200
201/**
202 * drm_format_num_planes - get the number of planes for format
203 * @format: pixel format (DRM_FORMAT_*)
204 *
205 * Returns:
206 * The number of planes used by the specified pixel format.
207 */
208int drm_format_num_planes(uint32_t format)
209{
210 const struct drm_format_info *info;
211
212 info = drm_format_info(format);
213 return info ? info->num_planes : 1;
214}
215EXPORT_SYMBOL(drm_format_num_planes);
216
217/**
218 * drm_format_plane_cpp - determine the bytes per pixel value
219 * @format: pixel format (DRM_FORMAT_*)
220 * @plane: plane index
221 *
222 * Returns:
223 * The bytes per pixel value for the specified plane.
224 */
225int drm_format_plane_cpp(uint32_t format, int plane)
226{
227 const struct drm_format_info *info;
228
229 info = drm_format_info(format);
230 if (!info || plane >= info->num_planes)
231 return 0;
232
233 return info->cpp[plane];
234}
235EXPORT_SYMBOL(drm_format_plane_cpp);
236
237/**
238 * drm_format_horz_chroma_subsampling - get the horizontal chroma subsampling factor
239 * @format: pixel format (DRM_FORMAT_*)
240 *
241 * Returns:
242 * The horizontal chroma subsampling factor for the
243 * specified pixel format.
244 */
245int drm_format_horz_chroma_subsampling(uint32_t format)
246{
247 const struct drm_format_info *info;
248
249 info = drm_format_info(format);
250 return info ? info->hsub : 1;
251}
252EXPORT_SYMBOL(drm_format_horz_chroma_subsampling);
253
254/**
255 * drm_format_vert_chroma_subsampling - get the vertical chroma subsampling factor
256 * @format: pixel format (DRM_FORMAT_*)
257 *
258 * Returns:
259 * The vertical chroma subsampling factor for the
260 * specified pixel format.
261 */
262int drm_format_vert_chroma_subsampling(uint32_t format)
263{
264 const struct drm_format_info *info;
265
266 info = drm_format_info(format);
267 return info ? info->vsub : 1;
268}
269EXPORT_SYMBOL(drm_format_vert_chroma_subsampling);
270
271/**
272 * drm_format_plane_width - width of the plane given the first plane
273 * @width: width of the first plane
274 * @format: pixel format
275 * @plane: plane index
276 *
277 * Returns:
278 * The width of @plane, given that the width of the first plane is @width.
279 */
280int drm_format_plane_width(int width, uint32_t format, int plane)
281{
282 const struct drm_format_info *info;
283
284 info = drm_format_info(format);
285 if (!info || plane >= info->num_planes)
286 return 0;
287
288 if (plane == 0)
289 return width;
290
291 return width / info->hsub;
292}
293EXPORT_SYMBOL(drm_format_plane_width);
294
295/**
296 * drm_format_plane_height - height of the plane given the first plane
297 * @height: height of the first plane
298 * @format: pixel format
299 * @plane: plane index
300 *
301 * Returns:
302 * The height of @plane, given that the height of the first plane is @height.
303 */
304int drm_format_plane_height(int height, uint32_t format, int plane)
305{
306 const struct drm_format_info *info;
307
308 info = drm_format_info(format);
309 if (!info || plane >= info->num_planes)
310 return 0;
311
312 if (plane == 0)
313 return height;
314
315 return height / info->vsub;
316}
317EXPORT_SYMBOL(drm_format_plane_height);