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254 lines
9.1 KiB
254 lines
9.1 KiB
/* SPDX-License-Identifier: GPL-2.0-only */ |
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/* |
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* v4l2-dv-timings - Internal header with dv-timings helper functions |
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* |
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* Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved. |
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*/ |
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#ifndef __V4L2_DV_TIMINGS_H |
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#define __V4L2_DV_TIMINGS_H |
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#include <linux/videodev2.h> |
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/** |
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* v4l2_calc_timeperframe - helper function to calculate timeperframe based |
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* v4l2_dv_timings fields. |
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* @t: Timings for the video mode. |
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* |
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* Calculates the expected timeperframe using the pixel clock value and |
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* horizontal/vertical measures. This means that v4l2_dv_timings structure |
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* must be correctly and fully filled. |
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*/ |
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struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t); |
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/* |
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* v4l2_dv_timings_presets: list of all dv_timings presets. |
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*/ |
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extern const struct v4l2_dv_timings v4l2_dv_timings_presets[]; |
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/** |
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* typedef v4l2_check_dv_timings_fnc - timings check callback |
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* |
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* @t: the v4l2_dv_timings struct. |
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* @handle: a handle from the driver. |
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* |
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* Returns true if the given timings are valid. |
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*/ |
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typedef bool v4l2_check_dv_timings_fnc(const struct v4l2_dv_timings *t, void *handle); |
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/** |
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* v4l2_valid_dv_timings() - are these timings valid? |
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* |
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* @t: the v4l2_dv_timings struct. |
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* @cap: the v4l2_dv_timings_cap capabilities. |
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* @fnc: callback to check if this timing is OK. May be NULL. |
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* @fnc_handle: a handle that is passed on to @fnc. |
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* |
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* Returns true if the given dv_timings struct is supported by the |
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* hardware capabilities and the callback function (if non-NULL), returns |
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* false otherwise. |
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*/ |
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bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t, |
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const struct v4l2_dv_timings_cap *cap, |
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v4l2_check_dv_timings_fnc fnc, |
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void *fnc_handle); |
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/** |
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* v4l2_enum_dv_timings_cap() - Helper function to enumerate possible DV |
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* timings based on capabilities |
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* |
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* @t: the v4l2_enum_dv_timings struct. |
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* @cap: the v4l2_dv_timings_cap capabilities. |
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* @fnc: callback to check if this timing is OK. May be NULL. |
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* @fnc_handle: a handle that is passed on to @fnc. |
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* |
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* This enumerates dv_timings using the full list of possible CEA-861 and DMT |
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* timings, filtering out any timings that are not supported based on the |
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* hardware capabilities and the callback function (if non-NULL). |
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* |
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* If a valid timing for the given index is found, it will fill in @t and |
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* return 0, otherwise it returns -EINVAL. |
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*/ |
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int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t, |
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const struct v4l2_dv_timings_cap *cap, |
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v4l2_check_dv_timings_fnc fnc, |
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void *fnc_handle); |
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/** |
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* v4l2_find_dv_timings_cap() - Find the closest timings struct |
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* |
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* @t: the v4l2_enum_dv_timings struct. |
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* @cap: the v4l2_dv_timings_cap capabilities. |
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* @pclock_delta: maximum delta between t->pixelclock and the timing struct |
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* under consideration. |
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* @fnc: callback to check if a given timings struct is OK. May be NULL. |
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* @fnc_handle: a handle that is passed on to @fnc. |
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* |
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* This function tries to map the given timings to an entry in the |
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* full list of possible CEA-861 and DMT timings, filtering out any timings |
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* that are not supported based on the hardware capabilities and the callback |
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* function (if non-NULL). |
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* |
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* On success it will fill in @t with the found timings and it returns true. |
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* On failure it will return false. |
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*/ |
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bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, |
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const struct v4l2_dv_timings_cap *cap, |
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unsigned pclock_delta, |
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v4l2_check_dv_timings_fnc fnc, |
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void *fnc_handle); |
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/** |
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* v4l2_find_dv_timings_cea861_vic() - find timings based on CEA-861 VIC |
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* @t: the timings data. |
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* @vic: CEA-861 VIC code |
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* |
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* On success it will fill in @t with the found timings and it returns true. |
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* On failure it will return false. |
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*/ |
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bool v4l2_find_dv_timings_cea861_vic(struct v4l2_dv_timings *t, u8 vic); |
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/** |
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* v4l2_match_dv_timings() - do two timings match? |
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* |
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* @measured: the measured timings data. |
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* @standard: the timings according to the standard. |
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* @pclock_delta: maximum delta in Hz between standard->pixelclock and |
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* the measured timings. |
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* @match_reduced_fps: if true, then fail if V4L2_DV_FL_REDUCED_FPS does not |
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* match. |
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* |
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* Returns true if the two timings match, returns false otherwise. |
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*/ |
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bool v4l2_match_dv_timings(const struct v4l2_dv_timings *measured, |
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const struct v4l2_dv_timings *standard, |
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unsigned pclock_delta, bool match_reduced_fps); |
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/** |
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* v4l2_print_dv_timings() - log the contents of a dv_timings struct |
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* @dev_prefix:device prefix for each log line. |
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* @prefix: additional prefix for each log line, may be NULL. |
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* @t: the timings data. |
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* @detailed: if true, give a detailed log. |
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*/ |
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void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix, |
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const struct v4l2_dv_timings *t, bool detailed); |
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/** |
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* v4l2_detect_cvt - detect if the given timings follow the CVT standard |
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* |
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* @frame_height: the total height of the frame (including blanking) in lines. |
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* @hfreq: the horizontal frequency in Hz. |
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* @vsync: the height of the vertical sync in lines. |
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* @active_width: active width of image (does not include blanking). This |
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* information is needed only in case of version 2 of reduced blanking. |
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* In other cases, this parameter does not have any effect on timings. |
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* @polarities: the horizontal and vertical polarities (same as struct |
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* v4l2_bt_timings polarities). |
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* @interlaced: if this flag is true, it indicates interlaced format |
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* @fmt: the resulting timings. |
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* |
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* This function will attempt to detect if the given values correspond to a |
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* valid CVT format. If so, then it will return true, and fmt will be filled |
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* in with the found CVT timings. |
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*/ |
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bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync, |
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unsigned active_width, u32 polarities, bool interlaced, |
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struct v4l2_dv_timings *fmt); |
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/** |
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* v4l2_detect_gtf - detect if the given timings follow the GTF standard |
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* |
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* @frame_height: the total height of the frame (including blanking) in lines. |
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* @hfreq: the horizontal frequency in Hz. |
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* @vsync: the height of the vertical sync in lines. |
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* @polarities: the horizontal and vertical polarities (same as struct |
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* v4l2_bt_timings polarities). |
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* @interlaced: if this flag is true, it indicates interlaced format |
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* @aspect: preferred aspect ratio. GTF has no method of determining the |
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* aspect ratio in order to derive the image width from the |
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* image height, so it has to be passed explicitly. Usually |
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* the native screen aspect ratio is used for this. If it |
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* is not filled in correctly, then 16:9 will be assumed. |
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* @fmt: the resulting timings. |
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* |
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* This function will attempt to detect if the given values correspond to a |
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* valid GTF format. If so, then it will return true, and fmt will be filled |
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* in with the found GTF timings. |
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*/ |
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bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync, |
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u32 polarities, bool interlaced, struct v4l2_fract aspect, |
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struct v4l2_dv_timings *fmt); |
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/** |
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* v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes |
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* 0x15 and 0x16 from the EDID. |
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* |
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* @hor_landscape: byte 0x15 from the EDID. |
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* @vert_portrait: byte 0x16 from the EDID. |
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* |
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* Determines the aspect ratio from the EDID. |
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* See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2: |
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* "Horizontal and Vertical Screen Size or Aspect Ratio" |
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*/ |
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struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait); |
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/** |
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* v4l2_dv_timings_aspect_ratio - calculate the aspect ratio based on the |
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* v4l2_dv_timings information. |
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* |
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* @t: the timings data. |
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*/ |
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struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t); |
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/** |
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* can_reduce_fps - check if conditions for reduced fps are true. |
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* @bt: v4l2 timing structure |
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* |
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* For different timings reduced fps is allowed if the following conditions |
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* are met: |
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* |
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* - For CVT timings: if reduced blanking v2 (vsync == 8) is true. |
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* - For CEA861 timings: if %V4L2_DV_FL_CAN_REDUCE_FPS flag is true. |
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*/ |
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static inline bool can_reduce_fps(struct v4l2_bt_timings *bt) |
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{ |
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if ((bt->standards & V4L2_DV_BT_STD_CVT) && (bt->vsync == 8)) |
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return true; |
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if ((bt->standards & V4L2_DV_BT_STD_CEA861) && |
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(bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS)) |
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return true; |
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return false; |
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} |
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/** |
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* struct v4l2_hdmi_colorimetry - describes the HDMI colorimetry information |
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* @colorspace: enum v4l2_colorspace, the colorspace |
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* @ycbcr_enc: enum v4l2_ycbcr_encoding, Y'CbCr encoding |
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* @quantization: enum v4l2_quantization, colorspace quantization |
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* @xfer_func: enum v4l2_xfer_func, colorspace transfer function |
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*/ |
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struct v4l2_hdmi_colorimetry { |
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enum v4l2_colorspace colorspace; |
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enum v4l2_ycbcr_encoding ycbcr_enc; |
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enum v4l2_quantization quantization; |
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enum v4l2_xfer_func xfer_func; |
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}; |
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struct hdmi_avi_infoframe; |
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struct hdmi_vendor_infoframe; |
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struct v4l2_hdmi_colorimetry |
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v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi, |
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const struct hdmi_vendor_infoframe *hdmi, |
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unsigned int height); |
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u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size, |
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unsigned int *offset); |
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void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr); |
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u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input); |
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int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port); |
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#endif
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