/src/barebox/drivers/video/drm/drm_modes.c
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1 | | /* |
2 | | * Copyright © 1997-2003 by The XFree86 Project, Inc. |
3 | | * Copyright © 2007 Dave Airlie |
4 | | * Copyright © 2007-2008 Intel Corporation |
5 | | * Jesse Barnes <jesse.barnes@intel.com> |
6 | | * Copyright 2005-2006 Luc Verhaegen |
7 | | * Copyright (c) 2001, Andy Ritger aritger@nvidia.com |
8 | | * |
9 | | * Permission is hereby granted, free of charge, to any person obtaining a |
10 | | * copy of this software and associated documentation files (the "Software"), |
11 | | * to deal in the Software without restriction, including without limitation |
12 | | * the rights to use, copy, modify, merge, publish, distribute, sublicense, |
13 | | * and/or sell copies of the Software, and to permit persons to whom the |
14 | | * Software is furnished to do so, subject to the following conditions: |
15 | | * |
16 | | * The above copyright notice and this permission notice shall be included in |
17 | | * all copies or substantial portions of the Software. |
18 | | * |
19 | | * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR |
20 | | * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, |
21 | | * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL |
22 | | * THE COPYRIGHT HOLDER(S) OR AUTHOR(S) BE LIABLE FOR ANY CLAIM, DAMAGES OR |
23 | | * OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, |
24 | | * ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR |
25 | | * OTHER DEALINGS IN THE SOFTWARE. |
26 | | * |
27 | | * Except as contained in this notice, the name of the copyright holder(s) |
28 | | * and author(s) shall not be used in advertising or otherwise to promote |
29 | | * the sale, use or other dealings in this Software without prior written |
30 | | * authorization from the copyright holder(s) and author(s). |
31 | | */ |
32 | | |
33 | | #include <linux/ctype.h> |
34 | | #include <linux/export.h> |
35 | | #include <linux/list.h> |
36 | | #include <of.h> |
37 | | |
38 | | #include <video/drm/drm_modes.h> |
39 | | |
40 | | /** |
41 | | * drm_mode_vrefresh - get the vrefresh of a mode |
42 | | * @mode: mode |
43 | | * |
44 | | * Returns: |
45 | | * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the |
46 | | * value first if it is not yet set. |
47 | | */ |
48 | | int drm_mode_vrefresh(const struct drm_display_mode *mode) |
49 | 0 | { |
50 | 0 | unsigned int num, den; |
51 | |
|
52 | 0 | if (mode->htotal == 0 || mode->vtotal == 0) |
53 | 0 | return 0; |
54 | | |
55 | 0 | num = mode->clock; |
56 | 0 | den = mode->htotal * mode->vtotal; |
57 | |
|
58 | 0 | if (mode->flags & DRM_MODE_FLAG_INTERLACE) |
59 | 0 | num *= 2; |
60 | 0 | if (mode->flags & DRM_MODE_FLAG_DBLSCAN) |
61 | 0 | den *= 2; |
62 | 0 | if (mode->vscan > 1) |
63 | 0 | den *= mode->vscan; |
64 | |
|
65 | 0 | return DIV_ROUND_CLOSEST_ULL(mul_u32_u32(num, 1000), den); |
66 | 0 | } |
67 | | EXPORT_SYMBOL(drm_mode_vrefresh); |