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Hans Verkuilb18787e2013-07-29 08:40:55 -03001/*
2 * v4l2-dv-timings - Internal header with dv-timings helper functions
3 *
4 * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved.
5 *
6 * This program is free software; you may redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; version 2 of the License.
9 *
10 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
11 * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
12 * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
13 * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS
14 * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN
15 * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
16 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
17 * SOFTWARE.
18 *
19 */
20
21#ifndef __V4L2_DV_TIMINGS_H
22#define __V4L2_DV_TIMINGS_H
23
24#include <linux/videodev2.h>
25
Mauro Carvalho Chehabfb91aec2015-10-01 09:35:01 -030026/*
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -030027 * v4l2_dv_timings_presets: list of all dv_timings presets.
Hans Verkuild1c65ad2013-08-19 10:19:54 -030028 */
29extern const struct v4l2_dv_timings v4l2_dv_timings_presets[];
30
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -030031/**
32 * v4l2_check_dv_timings_fnc - timings check callback
33 *
Hans Verkuilb8f0fff2013-08-19 11:21:50 -030034 * @t: the v4l2_dv_timings struct.
35 * @handle: a handle from the driver.
36 *
37 * Returns true if the given timings are valid.
38 */
39typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle);
40
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -030041/**
42 * v4l2_valid_dv_timings() - are these timings valid?
43 *
44 * @t: the v4l2_dv_timings struct.
45 * @cap: the v4l2_dv_timings_cap capabilities.
46 * @fnc: callback to check if this timing is OK. May be NULL.
47 * @fnc_handle: a handle that is passed on to @fnc.
48 *
49 * Returns true if the given dv_timings struct is supported by the
50 * hardware capabilities and the callback function (if non-NULL), returns
51 * false otherwise.
52 */
Hans Verkuil70b65492013-08-19 10:23:33 -030053bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t,
Hans Verkuilb8f0fff2013-08-19 11:21:50 -030054 const struct v4l2_dv_timings_cap *cap,
55 v4l2_check_dv_timings_fnc fnc,
56 void *fnc_handle);
Hans Verkuilb18787e2013-07-29 08:40:55 -030057
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -030058/**
59 * v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV
60 * timings based on capabilities
61 *
62 * @t: the v4l2_enum_dv_timings struct.
63 * @cap: the v4l2_dv_timings_cap capabilities.
64 * @fnc: callback to check if this timing is OK. May be NULL.
65 * @fnc_handle: a handle that is passed on to @fnc.
66 *
67 * This enumerates dv_timings using the full list of possible CEA-861 and DMT
68 * timings, filtering out any timings that are not supported based on the
69 * hardware capabilities and the callback function (if non-NULL).
70 *
71 * If a valid timing for the given index is found, it will fill in @t and
72 * return 0, otherwise it returns -EINVAL.
73 */
Hans Verkuilb18787e2013-07-29 08:40:55 -030074int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t,
Hans Verkuilb8f0fff2013-08-19 11:21:50 -030075 const struct v4l2_dv_timings_cap *cap,
76 v4l2_check_dv_timings_fnc fnc,
77 void *fnc_handle);
Hans Verkuilb18787e2013-07-29 08:40:55 -030078
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -030079/**
80 * v4l2_find_dv_timings_cap() - Find the closest timings struct
81 *
82 * @t: the v4l2_enum_dv_timings struct.
83 * @cap: the v4l2_dv_timings_cap capabilities.
84 * @pclock_delta: maximum delta between t->pixelclock and the timing struct
85 * under consideration.
86 * @fnc: callback to check if a given timings struct is OK. May be NULL.
87 * @fnc_handle: a handle that is passed on to @fnc.
88 *
89 * This function tries to map the given timings to an entry in the
90 * full list of possible CEA-861 and DMT timings, filtering out any timings
91 * that are not supported based on the hardware capabilities and the callback
92 * function (if non-NULL).
93 *
94 * On success it will fill in @t with the found timings and it returns true.
95 * On failure it will return false.
96 */
Hans Verkuilb18787e2013-07-29 08:40:55 -030097bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
98 const struct v4l2_dv_timings_cap *cap,
Hans Verkuilb8f0fff2013-08-19 11:21:50 -030099 unsigned pclock_delta,
100 v4l2_check_dv_timings_fnc fnc,
101 void *fnc_handle);
Hans Verkuilb18787e2013-07-29 08:40:55 -0300102
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300103/**
104 * v4l2_match_dv_timings() - do two timings match?
105 *
106 * @measured: the measured timings data.
107 * @standard: the timings according to the standard.
108 * @pclock_delta: maximum delta in Hz between standard->pixelclock and
109 * the measured timings.
Hans Verkuil85f9e062015-11-13 09:46:26 -0200110 * @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not
111 * match.
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300112 *
113 * Returns true if the two timings match, returns false otherwise.
114 */
Hans Verkuilef1ed8f2013-08-15 08:28:47 -0300115bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured,
116 const struct v4l2_dv_timings *standard,
Hans Verkuil85f9e062015-11-13 09:46:26 -0200117 unsigned pclock_delta, bool match_reduced_fps);
Hans Verkuil25764152013-07-29 08:40:56 -0300118
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300119/**
120 * v4l2_print_dv_timings() - log the contents of a dv_timings struct
121 * @dev_prefix:device prefix for each log line.
122 * @prefix: additional prefix for each log line, may be NULL.
123 * @t: the timings data.
124 * @detailed: if true, give a detailed log.
125 */
Hans Verkuil0216dc22013-08-15 08:02:40 -0300126void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix,
127 const struct v4l2_dv_timings *t, bool detailed);
128
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300129/**
130 * v4l2_detect_cvt - detect if the given timings follow the CVT standard
131 *
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300132 * @frame_height: the total height of the frame (including blanking) in lines.
133 * @hfreq: the horizontal frequency in Hz.
134 * @vsync: the height of the vertical sync in lines.
135 * @active_width: active width of image (does not include blanking). This
Prashant Laddha5fea1bb2015-06-10 13:51:42 -0300136 * information is needed only in case of version 2 of reduced blanking.
137 * In other cases, this parameter does not have any effect on timings.
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300138 * @polarities: the horizontal and vertical polarities (same as struct
Hans Verkuil25764152013-07-29 08:40:56 -0300139 * v4l2_bt_timings polarities).
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300140 * @interlaced: if this flag is true, it indicates interlaced format
141 * @fmt: the resulting timings.
Hans Verkuil25764152013-07-29 08:40:56 -0300142 *
143 * This function will attempt to detect if the given values correspond to a
144 * valid CVT format. If so, then it will return true, and fmt will be filled
145 * in with the found CVT timings.
146 */
147bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
Prashant Laddha5fea1bb2015-06-10 13:51:42 -0300148 unsigned active_width, u32 polarities, bool interlaced,
149 struct v4l2_dv_timings *fmt);
Hans Verkuil25764152013-07-29 08:40:56 -0300150
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300151/**
152 * v4l2_detect_gtf - detect if the given timings follow the GTF standard
153 *
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300154 * @frame_height: the total height of the frame (including blanking) in lines.
155 * @hfreq: the horizontal frequency in Hz.
156 * @vsync: the height of the vertical sync in lines.
157 * @polarities: the horizontal and vertical polarities (same as struct
Hans Verkuil25764152013-07-29 08:40:56 -0300158 * v4l2_bt_timings polarities).
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300159 * @interlaced: if this flag is true, it indicates interlaced format
160 * @aspect: preferred aspect ratio. GTF has no method of determining the
Hans Verkuil25764152013-07-29 08:40:56 -0300161 * aspect ratio in order to derive the image width from the
162 * image height, so it has to be passed explicitly. Usually
163 * the native screen aspect ratio is used for this. If it
164 * is not filled in correctly, then 16:9 will be assumed.
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300165 * @fmt: the resulting timings.
Hans Verkuil25764152013-07-29 08:40:56 -0300166 *
167 * This function will attempt to detect if the given values correspond to a
168 * valid GTF format. If so, then it will return true, and fmt will be filled
169 * in with the found GTF timings.
170 */
171bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
Prashant Laddha061ddda2015-05-22 02:27:34 -0300172 u32 polarities, bool interlaced, struct v4l2_fract aspect,
Hans Verkuil25764152013-07-29 08:40:56 -0300173 struct v4l2_dv_timings *fmt);
174
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300175/**
176 * v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
Hans Verkuil25764152013-07-29 08:40:56 -0300177 * 0x15 and 0x16 from the EDID.
Mauro Carvalho Chehab506bb542015-08-22 08:36:13 -0300178 *
Geliang Tangfd4b0d72015-09-15 09:36:01 -0300179 * @hor_landscape: byte 0x15 from the EDID.
180 * @vert_portrait: byte 0x16 from the EDID.
Hans Verkuil25764152013-07-29 08:40:56 -0300181 *
182 * Determines the aspect ratio from the EDID.
183 * See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
184 * "Horizontal and Vertical Screen Size or Aspect Ratio"
185 */
186struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
187
Prashant Laddha8d7322f2015-09-22 11:27:28 -0300188/*
189 * reduce_fps - check if conditions for reduced fps are true.
190 * bt - v4l2 timing structure
191 * For different timings reduced fps is allowed if following conditions
192 * are met -
193 * For CVT timings: if reduced blanking v2 (vsync == 8) is true.
194 * For CEA861 timings: if V4L2_DV_FL_CAN_REDUCE_FPS flag is true.
195 */
196static inline bool can_reduce_fps(struct v4l2_bt_timings *bt)
197{
198 if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8))
199 return true;
200
201 if ((bt->standards & V4L2_DV_BT_STD_CEA861) &&
202 (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS))
203 return true;
204
205 return false;
206}
207
208
Hans Verkuilb18787e2013-07-29 08:40:55 -0300209#endif