forked from Minki/linux
d973933858
The kernel.h macro DIV_ROUND_CLOSEST performs the computation (x + d/2)/d but is perhaps more readable. Signed-off-by: zhong jiang <zhongjiang@huawei.com> Signed-off-by: Hans Verkuil <hverkuil-cisco@xs4all.nl> Signed-off-by: Mauro Carvalho Chehab <mchehab@kernel.org>
1135 lines
33 KiB
C
1135 lines
33 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* v4l2-dv-timings - 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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#include <linux/module.h>
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#include <linux/types.h>
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#include <linux/kernel.h>
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#include <linux/errno.h>
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#include <linux/rational.h>
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#include <linux/videodev2.h>
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#include <linux/v4l2-dv-timings.h>
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#include <media/v4l2-dv-timings.h>
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#include <linux/math64.h>
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#include <linux/hdmi.h>
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#include <media/cec.h>
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MODULE_AUTHOR("Hans Verkuil");
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MODULE_DESCRIPTION("V4L2 DV Timings Helper Functions");
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MODULE_LICENSE("GPL");
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const struct v4l2_dv_timings v4l2_dv_timings_presets[] = {
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V4L2_DV_BT_CEA_640X480P59_94,
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V4L2_DV_BT_CEA_720X480I59_94,
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V4L2_DV_BT_CEA_720X480P59_94,
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V4L2_DV_BT_CEA_720X576I50,
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V4L2_DV_BT_CEA_720X576P50,
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V4L2_DV_BT_CEA_1280X720P24,
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V4L2_DV_BT_CEA_1280X720P25,
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V4L2_DV_BT_CEA_1280X720P30,
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V4L2_DV_BT_CEA_1280X720P50,
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V4L2_DV_BT_CEA_1280X720P60,
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V4L2_DV_BT_CEA_1920X1080P24,
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V4L2_DV_BT_CEA_1920X1080P25,
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V4L2_DV_BT_CEA_1920X1080P30,
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V4L2_DV_BT_CEA_1920X1080I50,
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V4L2_DV_BT_CEA_1920X1080P50,
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V4L2_DV_BT_CEA_1920X1080I60,
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V4L2_DV_BT_CEA_1920X1080P60,
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V4L2_DV_BT_DMT_640X350P85,
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V4L2_DV_BT_DMT_640X400P85,
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V4L2_DV_BT_DMT_720X400P85,
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V4L2_DV_BT_DMT_640X480P72,
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V4L2_DV_BT_DMT_640X480P75,
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V4L2_DV_BT_DMT_640X480P85,
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V4L2_DV_BT_DMT_800X600P56,
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V4L2_DV_BT_DMT_800X600P60,
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V4L2_DV_BT_DMT_800X600P72,
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V4L2_DV_BT_DMT_800X600P75,
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V4L2_DV_BT_DMT_800X600P85,
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V4L2_DV_BT_DMT_800X600P120_RB,
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V4L2_DV_BT_DMT_848X480P60,
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V4L2_DV_BT_DMT_1024X768I43,
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V4L2_DV_BT_DMT_1024X768P60,
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V4L2_DV_BT_DMT_1024X768P70,
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V4L2_DV_BT_DMT_1024X768P75,
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V4L2_DV_BT_DMT_1024X768P85,
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V4L2_DV_BT_DMT_1024X768P120_RB,
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V4L2_DV_BT_DMT_1152X864P75,
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V4L2_DV_BT_DMT_1280X768P60_RB,
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V4L2_DV_BT_DMT_1280X768P60,
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V4L2_DV_BT_DMT_1280X768P75,
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V4L2_DV_BT_DMT_1280X768P85,
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V4L2_DV_BT_DMT_1280X768P120_RB,
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V4L2_DV_BT_DMT_1280X800P60_RB,
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V4L2_DV_BT_DMT_1280X800P60,
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V4L2_DV_BT_DMT_1280X800P75,
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V4L2_DV_BT_DMT_1280X800P85,
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V4L2_DV_BT_DMT_1280X800P120_RB,
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V4L2_DV_BT_DMT_1280X960P60,
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V4L2_DV_BT_DMT_1280X960P85,
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V4L2_DV_BT_DMT_1280X960P120_RB,
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V4L2_DV_BT_DMT_1280X1024P60,
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V4L2_DV_BT_DMT_1280X1024P75,
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V4L2_DV_BT_DMT_1280X1024P85,
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V4L2_DV_BT_DMT_1280X1024P120_RB,
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V4L2_DV_BT_DMT_1360X768P60,
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V4L2_DV_BT_DMT_1360X768P120_RB,
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V4L2_DV_BT_DMT_1366X768P60,
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V4L2_DV_BT_DMT_1366X768P60_RB,
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V4L2_DV_BT_DMT_1400X1050P60_RB,
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V4L2_DV_BT_DMT_1400X1050P60,
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V4L2_DV_BT_DMT_1400X1050P75,
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V4L2_DV_BT_DMT_1400X1050P85,
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V4L2_DV_BT_DMT_1400X1050P120_RB,
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V4L2_DV_BT_DMT_1440X900P60_RB,
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V4L2_DV_BT_DMT_1440X900P60,
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V4L2_DV_BT_DMT_1440X900P75,
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V4L2_DV_BT_DMT_1440X900P85,
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V4L2_DV_BT_DMT_1440X900P120_RB,
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V4L2_DV_BT_DMT_1600X900P60_RB,
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V4L2_DV_BT_DMT_1600X1200P60,
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V4L2_DV_BT_DMT_1600X1200P65,
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V4L2_DV_BT_DMT_1600X1200P70,
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V4L2_DV_BT_DMT_1600X1200P75,
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V4L2_DV_BT_DMT_1600X1200P85,
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V4L2_DV_BT_DMT_1600X1200P120_RB,
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V4L2_DV_BT_DMT_1680X1050P60_RB,
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V4L2_DV_BT_DMT_1680X1050P60,
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V4L2_DV_BT_DMT_1680X1050P75,
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V4L2_DV_BT_DMT_1680X1050P85,
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V4L2_DV_BT_DMT_1680X1050P120_RB,
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V4L2_DV_BT_DMT_1792X1344P60,
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V4L2_DV_BT_DMT_1792X1344P75,
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V4L2_DV_BT_DMT_1792X1344P120_RB,
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V4L2_DV_BT_DMT_1856X1392P60,
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V4L2_DV_BT_DMT_1856X1392P75,
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V4L2_DV_BT_DMT_1856X1392P120_RB,
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V4L2_DV_BT_DMT_1920X1200P60_RB,
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V4L2_DV_BT_DMT_1920X1200P60,
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V4L2_DV_BT_DMT_1920X1200P75,
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V4L2_DV_BT_DMT_1920X1200P85,
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V4L2_DV_BT_DMT_1920X1200P120_RB,
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V4L2_DV_BT_DMT_1920X1440P60,
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V4L2_DV_BT_DMT_1920X1440P75,
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V4L2_DV_BT_DMT_1920X1440P120_RB,
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V4L2_DV_BT_DMT_2048X1152P60_RB,
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V4L2_DV_BT_DMT_2560X1600P60_RB,
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V4L2_DV_BT_DMT_2560X1600P60,
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V4L2_DV_BT_DMT_2560X1600P75,
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V4L2_DV_BT_DMT_2560X1600P85,
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V4L2_DV_BT_DMT_2560X1600P120_RB,
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V4L2_DV_BT_CEA_3840X2160P24,
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V4L2_DV_BT_CEA_3840X2160P25,
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V4L2_DV_BT_CEA_3840X2160P30,
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V4L2_DV_BT_CEA_3840X2160P50,
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V4L2_DV_BT_CEA_3840X2160P60,
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V4L2_DV_BT_CEA_4096X2160P24,
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V4L2_DV_BT_CEA_4096X2160P25,
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V4L2_DV_BT_CEA_4096X2160P30,
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V4L2_DV_BT_CEA_4096X2160P50,
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V4L2_DV_BT_DMT_4096X2160P59_94_RB,
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V4L2_DV_BT_CEA_4096X2160P60,
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{ }
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};
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EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets);
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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 *dvcap,
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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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const struct v4l2_bt_timings *bt = &t->bt;
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const struct v4l2_bt_timings_cap *cap = &dvcap->bt;
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u32 caps = cap->capabilities;
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if (t->type != V4L2_DV_BT_656_1120)
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return false;
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if (t->type != dvcap->type ||
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bt->height < cap->min_height ||
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bt->height > cap->max_height ||
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bt->width < cap->min_width ||
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bt->width > cap->max_width ||
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bt->pixelclock < cap->min_pixelclock ||
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bt->pixelclock > cap->max_pixelclock ||
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(!(caps & V4L2_DV_BT_CAP_CUSTOM) &&
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cap->standards && bt->standards &&
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!(bt->standards & cap->standards)) ||
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(bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) ||
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(!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE)))
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return false;
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return fnc == NULL || fnc(t, fnc_handle);
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}
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EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings);
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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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u32 i, idx;
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memset(t->reserved, 0, sizeof(t->reserved));
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for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) {
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if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
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fnc, fnc_handle) &&
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idx++ == t->index) {
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t->timings = v4l2_dv_timings_presets[i];
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return 0;
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}
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}
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return -EINVAL;
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}
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EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap);
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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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int i;
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if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle))
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return false;
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for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) {
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if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap,
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fnc, fnc_handle) &&
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v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i,
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pclock_delta, false)) {
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u32 flags = t->bt.flags & V4L2_DV_FL_REDUCED_FPS;
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*t = v4l2_dv_timings_presets[i];
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if (can_reduce_fps(&t->bt))
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t->bt.flags |= flags;
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return true;
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}
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}
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return false;
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}
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EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
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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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unsigned int i;
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for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) {
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const struct v4l2_bt_timings *bt =
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&v4l2_dv_timings_presets[i].bt;
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if ((bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) &&
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bt->cea861_vic == vic) {
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*t = v4l2_dv_timings_presets[i];
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return true;
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}
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}
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return false;
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}
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EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cea861_vic);
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/**
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* v4l2_match_dv_timings - check if two timings match
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* @t1: compare this v4l2_dv_timings struct...
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* @t2: with this struct.
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* @pclock_delta: the allowed pixelclock deviation.
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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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* Compare t1 with t2 with a given margin of error for the pixelclock.
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*/
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bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1,
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const struct v4l2_dv_timings *t2,
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unsigned pclock_delta, bool match_reduced_fps)
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{
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if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120)
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return false;
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if (t1->bt.width == t2->bt.width &&
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t1->bt.height == t2->bt.height &&
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t1->bt.interlaced == t2->bt.interlaced &&
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t1->bt.polarities == t2->bt.polarities &&
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t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta &&
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t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta &&
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t1->bt.hfrontporch == t2->bt.hfrontporch &&
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t1->bt.hsync == t2->bt.hsync &&
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t1->bt.hbackporch == t2->bt.hbackporch &&
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t1->bt.vfrontporch == t2->bt.vfrontporch &&
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t1->bt.vsync == t2->bt.vsync &&
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t1->bt.vbackporch == t2->bt.vbackporch &&
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(!match_reduced_fps ||
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(t1->bt.flags & V4L2_DV_FL_REDUCED_FPS) ==
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(t2->bt.flags & V4L2_DV_FL_REDUCED_FPS)) &&
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(!t1->bt.interlaced ||
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(t1->bt.il_vfrontporch == t2->bt.il_vfrontporch &&
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t1->bt.il_vsync == t2->bt.il_vsync &&
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t1->bt.il_vbackporch == t2->bt.il_vbackporch)))
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return true;
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return false;
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}
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EXPORT_SYMBOL_GPL(v4l2_match_dv_timings);
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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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const struct v4l2_bt_timings *bt = &t->bt;
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u32 htot, vtot;
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u32 fps;
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if (t->type != V4L2_DV_BT_656_1120)
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return;
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htot = V4L2_DV_BT_FRAME_WIDTH(bt);
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vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
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if (bt->interlaced)
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vtot /= 2;
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fps = (htot * vtot) > 0 ? div_u64((100 * (u64)bt->pixelclock),
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(htot * vtot)) : 0;
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if (prefix == NULL)
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prefix = "";
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pr_info("%s: %s%ux%u%s%u.%02u (%ux%u)\n", dev_prefix, prefix,
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bt->width, bt->height, bt->interlaced ? "i" : "p",
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fps / 100, fps % 100, htot, vtot);
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if (!detailed)
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return;
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pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n",
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dev_prefix, bt->hfrontporch,
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(bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-",
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bt->hsync, bt->hbackporch);
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pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n",
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dev_prefix, bt->vfrontporch,
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(bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
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bt->vsync, bt->vbackporch);
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if (bt->interlaced)
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pr_info("%s: vertical bottom field: fp = %u, %ssync = %u, bp = %u\n",
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dev_prefix, bt->il_vfrontporch,
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(bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-",
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bt->il_vsync, bt->il_vbackporch);
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pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock);
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pr_info("%s: flags (0x%x):%s%s%s%s%s%s%s%s%s%s\n",
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dev_prefix, bt->flags,
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(bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ?
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" REDUCED_BLANKING" : "",
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((bt->flags & V4L2_DV_FL_REDUCED_BLANKING) &&
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bt->vsync == 8) ? " (V2)" : "",
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(bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ?
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" CAN_REDUCE_FPS" : "",
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(bt->flags & V4L2_DV_FL_REDUCED_FPS) ?
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" REDUCED_FPS" : "",
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(bt->flags & V4L2_DV_FL_HALF_LINE) ?
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" HALF_LINE" : "",
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(bt->flags & V4L2_DV_FL_IS_CE_VIDEO) ?
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" CE_VIDEO" : "",
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(bt->flags & V4L2_DV_FL_FIRST_FIELD_EXTRA_LINE) ?
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" FIRST_FIELD_EXTRA_LINE" : "",
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(bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT) ?
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" HAS_PICTURE_ASPECT" : "",
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(bt->flags & V4L2_DV_FL_HAS_CEA861_VIC) ?
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" HAS_CEA861_VIC" : "",
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(bt->flags & V4L2_DV_FL_HAS_HDMI_VIC) ?
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" HAS_HDMI_VIC" : "");
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pr_info("%s: standards (0x%x):%s%s%s%s%s\n", dev_prefix, bt->standards,
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(bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "",
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(bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "",
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(bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "",
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(bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : "",
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(bt->standards & V4L2_DV_BT_STD_SDI) ? " SDI" : "");
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if (bt->flags & V4L2_DV_FL_HAS_PICTURE_ASPECT)
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pr_info("%s: picture aspect (hor:vert): %u:%u\n", dev_prefix,
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bt->picture_aspect.numerator,
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bt->picture_aspect.denominator);
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if (bt->flags & V4L2_DV_FL_HAS_CEA861_VIC)
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pr_info("%s: CEA-861 VIC: %u\n", dev_prefix, bt->cea861_vic);
|
|
if (bt->flags & V4L2_DV_FL_HAS_HDMI_VIC)
|
|
pr_info("%s: HDMI VIC: %u\n", dev_prefix, bt->hdmi_vic);
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_print_dv_timings);
|
|
|
|
struct v4l2_fract v4l2_dv_timings_aspect_ratio(const struct v4l2_dv_timings *t)
|
|
{
|
|
struct v4l2_fract ratio = { 1, 1 };
|
|
unsigned long n, d;
|
|
|
|
if (t->type != V4L2_DV_BT_656_1120)
|
|
return ratio;
|
|
if (!(t->bt.flags & V4L2_DV_FL_HAS_PICTURE_ASPECT))
|
|
return ratio;
|
|
|
|
ratio.numerator = t->bt.width * t->bt.picture_aspect.denominator;
|
|
ratio.denominator = t->bt.height * t->bt.picture_aspect.numerator;
|
|
|
|
rational_best_approximation(ratio.numerator, ratio.denominator,
|
|
ratio.numerator, ratio.denominator, &n, &d);
|
|
ratio.numerator = n;
|
|
ratio.denominator = d;
|
|
return ratio;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_dv_timings_aspect_ratio);
|
|
|
|
/** v4l2_calc_timeperframe - helper function to calculate timeperframe based
|
|
* v4l2_dv_timings fields.
|
|
* @t - Timings for the video mode.
|
|
*
|
|
* Calculates the expected timeperframe using the pixel clock value and
|
|
* horizontal/vertical measures. This means that v4l2_dv_timings structure
|
|
* must be correctly and fully filled.
|
|
*/
|
|
struct v4l2_fract v4l2_calc_timeperframe(const struct v4l2_dv_timings *t)
|
|
{
|
|
const struct v4l2_bt_timings *bt = &t->bt;
|
|
struct v4l2_fract fps_fract = { 1, 1 };
|
|
unsigned long n, d;
|
|
u32 htot, vtot, fps;
|
|
u64 pclk;
|
|
|
|
if (t->type != V4L2_DV_BT_656_1120)
|
|
return fps_fract;
|
|
|
|
htot = V4L2_DV_BT_FRAME_WIDTH(bt);
|
|
vtot = V4L2_DV_BT_FRAME_HEIGHT(bt);
|
|
pclk = bt->pixelclock;
|
|
|
|
if ((bt->flags & V4L2_DV_FL_CAN_DETECT_REDUCED_FPS) &&
|
|
(bt->flags & V4L2_DV_FL_REDUCED_FPS))
|
|
pclk = div_u64(pclk * 1000ULL, 1001);
|
|
|
|
fps = (htot * vtot) > 0 ? div_u64((100 * pclk), (htot * vtot)) : 0;
|
|
if (!fps)
|
|
return fps_fract;
|
|
|
|
rational_best_approximation(fps, 100, fps, 100, &n, &d);
|
|
|
|
fps_fract.numerator = d;
|
|
fps_fract.denominator = n;
|
|
return fps_fract;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_calc_timeperframe);
|
|
|
|
/*
|
|
* CVT defines
|
|
* Based on Coordinated Video Timings Standard
|
|
* version 1.1 September 10, 2003
|
|
*/
|
|
|
|
#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */
|
|
#define CVT_PXL_CLK_GRAN_RB_V2 1000 /* granularity for reduced blanking v2*/
|
|
|
|
/* Normal blanking */
|
|
#define CVT_MIN_V_BPORCH 7 /* lines */
|
|
#define CVT_MIN_V_PORCH_RND 3 /* lines */
|
|
#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
|
|
#define CVT_HSYNC_PERCENT 8 /* nominal hsync as percentage of line */
|
|
|
|
/* Normal blanking for CVT uses GTF to calculate horizontal blanking */
|
|
#define CVT_CELL_GRAN 8 /* character cell granularity */
|
|
#define CVT_M 600 /* blanking formula gradient */
|
|
#define CVT_C 40 /* blanking formula offset */
|
|
#define CVT_K 128 /* blanking formula scaling factor */
|
|
#define CVT_J 20 /* blanking formula scaling factor */
|
|
#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
|
|
#define CVT_M_PRIME (CVT_K * CVT_M / 256)
|
|
|
|
/* Reduced Blanking */
|
|
#define CVT_RB_MIN_V_BPORCH 7 /* lines */
|
|
#define CVT_RB_V_FPORCH 3 /* lines */
|
|
#define CVT_RB_MIN_V_BLANK 460 /* us */
|
|
#define CVT_RB_H_SYNC 32 /* pixels */
|
|
#define CVT_RB_H_BLANK 160 /* pixels */
|
|
/* Reduce blanking Version 2 */
|
|
#define CVT_RB_V2_H_BLANK 80 /* pixels */
|
|
#define CVT_RB_MIN_V_FPORCH 3 /* lines */
|
|
#define CVT_RB_V2_MIN_V_FPORCH 1 /* lines */
|
|
#define CVT_RB_V_BPORCH 6 /* lines */
|
|
|
|
/** v4l2_detect_cvt - detect if the given timings follow the CVT standard
|
|
* @frame_height - the total height of the frame (including blanking) in lines.
|
|
* @hfreq - the horizontal frequency in Hz.
|
|
* @vsync - the height of the vertical sync in lines.
|
|
* @active_width - active width of image (does not include blanking). This
|
|
* information is needed only in case of version 2 of reduced blanking.
|
|
* In other cases, this parameter does not have any effect on timings.
|
|
* @polarities - the horizontal and vertical polarities (same as struct
|
|
* v4l2_bt_timings polarities).
|
|
* @interlaced - if this flag is true, it indicates interlaced format
|
|
* @fmt - the resulting timings.
|
|
*
|
|
* This function will attempt to detect if the given values correspond to a
|
|
* valid CVT format. If so, then it will return true, and fmt will be filled
|
|
* in with the found CVT timings.
|
|
*/
|
|
bool v4l2_detect_cvt(unsigned frame_height,
|
|
unsigned hfreq,
|
|
unsigned vsync,
|
|
unsigned active_width,
|
|
u32 polarities,
|
|
bool interlaced,
|
|
struct v4l2_dv_timings *fmt)
|
|
{
|
|
int v_fp, v_bp, h_fp, h_bp, hsync;
|
|
int frame_width, image_height, image_width;
|
|
bool reduced_blanking;
|
|
bool rb_v2 = false;
|
|
unsigned pix_clk;
|
|
|
|
if (vsync < 4 || vsync > 8)
|
|
return false;
|
|
|
|
if (polarities == V4L2_DV_VSYNC_POS_POL)
|
|
reduced_blanking = false;
|
|
else if (polarities == V4L2_DV_HSYNC_POS_POL)
|
|
reduced_blanking = true;
|
|
else
|
|
return false;
|
|
|
|
if (reduced_blanking && vsync == 8)
|
|
rb_v2 = true;
|
|
|
|
if (rb_v2 && active_width == 0)
|
|
return false;
|
|
|
|
if (!rb_v2 && vsync > 7)
|
|
return false;
|
|
|
|
if (hfreq == 0)
|
|
return false;
|
|
|
|
/* Vertical */
|
|
if (reduced_blanking) {
|
|
if (rb_v2) {
|
|
v_bp = CVT_RB_V_BPORCH;
|
|
v_fp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
|
|
v_fp -= vsync + v_bp;
|
|
|
|
if (v_fp < CVT_RB_V2_MIN_V_FPORCH)
|
|
v_fp = CVT_RB_V2_MIN_V_FPORCH;
|
|
} else {
|
|
v_fp = CVT_RB_V_FPORCH;
|
|
v_bp = (CVT_RB_MIN_V_BLANK * hfreq) / 1000000 + 1;
|
|
v_bp -= vsync + v_fp;
|
|
|
|
if (v_bp < CVT_RB_MIN_V_BPORCH)
|
|
v_bp = CVT_RB_MIN_V_BPORCH;
|
|
}
|
|
} else {
|
|
v_fp = CVT_MIN_V_PORCH_RND;
|
|
v_bp = (CVT_MIN_VSYNC_BP * hfreq) / 1000000 + 1 - vsync;
|
|
|
|
if (v_bp < CVT_MIN_V_BPORCH)
|
|
v_bp = CVT_MIN_V_BPORCH;
|
|
}
|
|
|
|
if (interlaced)
|
|
image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
|
|
else
|
|
image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
|
|
|
|
if (image_height < 0)
|
|
return false;
|
|
|
|
/* Aspect ratio based on vsync */
|
|
switch (vsync) {
|
|
case 4:
|
|
image_width = (image_height * 4) / 3;
|
|
break;
|
|
case 5:
|
|
image_width = (image_height * 16) / 9;
|
|
break;
|
|
case 6:
|
|
image_width = (image_height * 16) / 10;
|
|
break;
|
|
case 7:
|
|
/* special case */
|
|
if (image_height == 1024)
|
|
image_width = (image_height * 5) / 4;
|
|
else if (image_height == 768)
|
|
image_width = (image_height * 15) / 9;
|
|
else
|
|
return false;
|
|
break;
|
|
case 8:
|
|
image_width = active_width;
|
|
break;
|
|
default:
|
|
return false;
|
|
}
|
|
|
|
if (!rb_v2)
|
|
image_width = image_width & ~7;
|
|
|
|
/* Horizontal */
|
|
if (reduced_blanking) {
|
|
int h_blank;
|
|
int clk_gran;
|
|
|
|
h_blank = rb_v2 ? CVT_RB_V2_H_BLANK : CVT_RB_H_BLANK;
|
|
clk_gran = rb_v2 ? CVT_PXL_CLK_GRAN_RB_V2 : CVT_PXL_CLK_GRAN;
|
|
|
|
pix_clk = (image_width + h_blank) * hfreq;
|
|
pix_clk = (pix_clk / clk_gran) * clk_gran;
|
|
|
|
h_bp = h_blank / 2;
|
|
hsync = CVT_RB_H_SYNC;
|
|
h_fp = h_blank - h_bp - hsync;
|
|
|
|
frame_width = image_width + h_blank;
|
|
} else {
|
|
unsigned ideal_duty_cycle_per_myriad =
|
|
100 * CVT_C_PRIME - (CVT_M_PRIME * 100000) / hfreq;
|
|
int h_blank;
|
|
|
|
if (ideal_duty_cycle_per_myriad < 2000)
|
|
ideal_duty_cycle_per_myriad = 2000;
|
|
|
|
h_blank = image_width * ideal_duty_cycle_per_myriad /
|
|
(10000 - ideal_duty_cycle_per_myriad);
|
|
h_blank = (h_blank / (2 * CVT_CELL_GRAN)) * 2 * CVT_CELL_GRAN;
|
|
|
|
pix_clk = (image_width + h_blank) * hfreq;
|
|
pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
|
|
|
|
h_bp = h_blank / 2;
|
|
frame_width = image_width + h_blank;
|
|
|
|
hsync = frame_width * CVT_HSYNC_PERCENT / 100;
|
|
hsync = (hsync / CVT_CELL_GRAN) * CVT_CELL_GRAN;
|
|
h_fp = h_blank - hsync - h_bp;
|
|
}
|
|
|
|
fmt->type = V4L2_DV_BT_656_1120;
|
|
fmt->bt.polarities = polarities;
|
|
fmt->bt.width = image_width;
|
|
fmt->bt.height = image_height;
|
|
fmt->bt.hfrontporch = h_fp;
|
|
fmt->bt.vfrontporch = v_fp;
|
|
fmt->bt.hsync = hsync;
|
|
fmt->bt.vsync = vsync;
|
|
fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
|
|
|
|
if (!interlaced) {
|
|
fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
|
|
fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
|
|
} else {
|
|
fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
|
|
2 * vsync) / 2;
|
|
fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
|
|
2 * vsync - fmt->bt.vbackporch;
|
|
fmt->bt.il_vfrontporch = v_fp;
|
|
fmt->bt.il_vsync = vsync;
|
|
fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
|
|
fmt->bt.interlaced = V4L2_DV_INTERLACED;
|
|
}
|
|
|
|
fmt->bt.pixelclock = pix_clk;
|
|
fmt->bt.standards = V4L2_DV_BT_STD_CVT;
|
|
|
|
if (reduced_blanking)
|
|
fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
|
|
|
|
/*
|
|
* GTF defines
|
|
* Based on Generalized Timing Formula Standard
|
|
* Version 1.1 September 2, 1999
|
|
*/
|
|
|
|
#define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */
|
|
|
|
#define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
|
|
#define GTF_V_FP 1 /* vertical front porch (lines) */
|
|
#define GTF_CELL_GRAN 8 /* character cell granularity */
|
|
|
|
/* Default */
|
|
#define GTF_D_M 600 /* blanking formula gradient */
|
|
#define GTF_D_C 40 /* blanking formula offset */
|
|
#define GTF_D_K 128 /* blanking formula scaling factor */
|
|
#define GTF_D_J 20 /* blanking formula scaling factor */
|
|
#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
|
|
#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
|
|
|
|
/* Secondary */
|
|
#define GTF_S_M 3600 /* blanking formula gradient */
|
|
#define GTF_S_C 40 /* blanking formula offset */
|
|
#define GTF_S_K 128 /* blanking formula scaling factor */
|
|
#define GTF_S_J 35 /* blanking formula scaling factor */
|
|
#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
|
|
#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
|
|
|
|
/** v4l2_detect_gtf - detect if the given timings follow the GTF standard
|
|
* @frame_height - the total height of the frame (including blanking) in lines.
|
|
* @hfreq - the horizontal frequency in Hz.
|
|
* @vsync - the height of the vertical sync in lines.
|
|
* @polarities - the horizontal and vertical polarities (same as struct
|
|
* v4l2_bt_timings polarities).
|
|
* @interlaced - if this flag is true, it indicates interlaced format
|
|
* @aspect - preferred aspect ratio. GTF has no method of determining the
|
|
* aspect ratio in order to derive the image width from the
|
|
* image height, so it has to be passed explicitly. Usually
|
|
* the native screen aspect ratio is used for this. If it
|
|
* is not filled in correctly, then 16:9 will be assumed.
|
|
* @fmt - the resulting timings.
|
|
*
|
|
* This function will attempt to detect if the given values correspond to a
|
|
* valid GTF format. If so, then it will return true, and fmt will be filled
|
|
* in with the found GTF timings.
|
|
*/
|
|
bool v4l2_detect_gtf(unsigned frame_height,
|
|
unsigned hfreq,
|
|
unsigned vsync,
|
|
u32 polarities,
|
|
bool interlaced,
|
|
struct v4l2_fract aspect,
|
|
struct v4l2_dv_timings *fmt)
|
|
{
|
|
int pix_clk;
|
|
int v_fp, v_bp, h_fp, hsync;
|
|
int frame_width, image_height, image_width;
|
|
bool default_gtf;
|
|
int h_blank;
|
|
|
|
if (vsync != 3)
|
|
return false;
|
|
|
|
if (polarities == V4L2_DV_VSYNC_POS_POL)
|
|
default_gtf = true;
|
|
else if (polarities == V4L2_DV_HSYNC_POS_POL)
|
|
default_gtf = false;
|
|
else
|
|
return false;
|
|
|
|
if (hfreq == 0)
|
|
return false;
|
|
|
|
/* Vertical */
|
|
v_fp = GTF_V_FP;
|
|
v_bp = (GTF_MIN_VSYNC_BP * hfreq + 500000) / 1000000 - vsync;
|
|
if (interlaced)
|
|
image_height = (frame_height - 2 * v_fp - 2 * vsync - 2 * v_bp) & ~0x1;
|
|
else
|
|
image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
|
|
|
|
if (image_height < 0)
|
|
return false;
|
|
|
|
if (aspect.numerator == 0 || aspect.denominator == 0) {
|
|
aspect.numerator = 16;
|
|
aspect.denominator = 9;
|
|
}
|
|
image_width = ((image_height * aspect.numerator) / aspect.denominator);
|
|
image_width = (image_width + GTF_CELL_GRAN/2) & ~(GTF_CELL_GRAN - 1);
|
|
|
|
/* Horizontal */
|
|
if (default_gtf) {
|
|
u64 num;
|
|
u32 den;
|
|
|
|
num = ((image_width * GTF_D_C_PRIME * (u64)hfreq) -
|
|
((u64)image_width * GTF_D_M_PRIME * 1000));
|
|
den = (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) *
|
|
(2 * GTF_CELL_GRAN);
|
|
h_blank = div_u64((num + (den >> 1)), den);
|
|
h_blank *= (2 * GTF_CELL_GRAN);
|
|
} else {
|
|
u64 num;
|
|
u32 den;
|
|
|
|
num = ((image_width * GTF_S_C_PRIME * (u64)hfreq) -
|
|
((u64)image_width * GTF_S_M_PRIME * 1000));
|
|
den = (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) *
|
|
(2 * GTF_CELL_GRAN);
|
|
h_blank = div_u64((num + (den >> 1)), den);
|
|
h_blank *= (2 * GTF_CELL_GRAN);
|
|
}
|
|
|
|
frame_width = image_width + h_blank;
|
|
|
|
pix_clk = (image_width + h_blank) * hfreq;
|
|
pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
|
|
|
|
hsync = (frame_width * 8 + 50) / 100;
|
|
hsync = DIV_ROUND_CLOSEST(hsync, GTF_CELL_GRAN) * GTF_CELL_GRAN;
|
|
|
|
h_fp = h_blank / 2 - hsync;
|
|
|
|
fmt->type = V4L2_DV_BT_656_1120;
|
|
fmt->bt.polarities = polarities;
|
|
fmt->bt.width = image_width;
|
|
fmt->bt.height = image_height;
|
|
fmt->bt.hfrontporch = h_fp;
|
|
fmt->bt.vfrontporch = v_fp;
|
|
fmt->bt.hsync = hsync;
|
|
fmt->bt.vsync = vsync;
|
|
fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
|
|
|
|
if (!interlaced) {
|
|
fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
|
|
fmt->bt.interlaced = V4L2_DV_PROGRESSIVE;
|
|
} else {
|
|
fmt->bt.vbackporch = (frame_height - image_height - 2 * v_fp -
|
|
2 * vsync) / 2;
|
|
fmt->bt.il_vbackporch = frame_height - image_height - 2 * v_fp -
|
|
2 * vsync - fmt->bt.vbackporch;
|
|
fmt->bt.il_vfrontporch = v_fp;
|
|
fmt->bt.il_vsync = vsync;
|
|
fmt->bt.flags |= V4L2_DV_FL_HALF_LINE;
|
|
fmt->bt.interlaced = V4L2_DV_INTERLACED;
|
|
}
|
|
|
|
fmt->bt.pixelclock = pix_clk;
|
|
fmt->bt.standards = V4L2_DV_BT_STD_GTF;
|
|
|
|
if (!default_gtf)
|
|
fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
|
|
|
|
return true;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
|
|
|
|
/** v4l2_calc_aspect_ratio - calculate the aspect ratio based on bytes
|
|
* 0x15 and 0x16 from the EDID.
|
|
* @hor_landscape - byte 0x15 from the EDID.
|
|
* @vert_portrait - byte 0x16 from the EDID.
|
|
*
|
|
* Determines the aspect ratio from the EDID.
|
|
* See VESA Enhanced EDID standard, release A, rev 2, section 3.6.2:
|
|
* "Horizontal and Vertical Screen Size or Aspect Ratio"
|
|
*/
|
|
struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait)
|
|
{
|
|
struct v4l2_fract aspect = { 16, 9 };
|
|
u8 ratio;
|
|
|
|
/* Nothing filled in, fallback to 16:9 */
|
|
if (!hor_landscape && !vert_portrait)
|
|
return aspect;
|
|
/* Both filled in, so they are interpreted as the screen size in cm */
|
|
if (hor_landscape && vert_portrait) {
|
|
aspect.numerator = hor_landscape;
|
|
aspect.denominator = vert_portrait;
|
|
return aspect;
|
|
}
|
|
/* Only one is filled in, so interpret them as a ratio:
|
|
(val + 99) / 100 */
|
|
ratio = hor_landscape | vert_portrait;
|
|
/* Change some rounded values into the exact aspect ratio */
|
|
if (ratio == 79) {
|
|
aspect.numerator = 16;
|
|
aspect.denominator = 9;
|
|
} else if (ratio == 34) {
|
|
aspect.numerator = 4;
|
|
aspect.denominator = 3;
|
|
} else if (ratio == 68) {
|
|
aspect.numerator = 15;
|
|
aspect.denominator = 9;
|
|
} else {
|
|
aspect.numerator = hor_landscape + 99;
|
|
aspect.denominator = 100;
|
|
}
|
|
if (hor_landscape)
|
|
return aspect;
|
|
/* The aspect ratio is for portrait, so swap numerator and denominator */
|
|
swap(aspect.denominator, aspect.numerator);
|
|
return aspect;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
|
|
|
|
/** v4l2_hdmi_rx_colorimetry - determine HDMI colorimetry information
|
|
* based on various InfoFrames.
|
|
* @avi: the AVI InfoFrame
|
|
* @hdmi: the HDMI Vendor InfoFrame, may be NULL
|
|
* @height: the frame height
|
|
*
|
|
* Determines the HDMI colorimetry information, i.e. how the HDMI
|
|
* pixel color data should be interpreted.
|
|
*
|
|
* Note that some of the newer features (DCI-P3, HDR) are not yet
|
|
* implemented: the hdmi.h header needs to be updated to the HDMI 2.0
|
|
* and CTA-861-G standards.
|
|
*/
|
|
struct v4l2_hdmi_colorimetry
|
|
v4l2_hdmi_rx_colorimetry(const struct hdmi_avi_infoframe *avi,
|
|
const struct hdmi_vendor_infoframe *hdmi,
|
|
unsigned int height)
|
|
{
|
|
struct v4l2_hdmi_colorimetry c = {
|
|
V4L2_COLORSPACE_SRGB,
|
|
V4L2_YCBCR_ENC_DEFAULT,
|
|
V4L2_QUANTIZATION_FULL_RANGE,
|
|
V4L2_XFER_FUNC_SRGB
|
|
};
|
|
bool is_ce = avi->video_code || (hdmi && hdmi->vic);
|
|
bool is_sdtv = height <= 576;
|
|
bool default_is_lim_range_rgb = avi->video_code > 1;
|
|
|
|
switch (avi->colorspace) {
|
|
case HDMI_COLORSPACE_RGB:
|
|
/* RGB pixel encoding */
|
|
switch (avi->colorimetry) {
|
|
case HDMI_COLORIMETRY_EXTENDED:
|
|
switch (avi->extended_colorimetry) {
|
|
case HDMI_EXTENDED_COLORIMETRY_OPRGB:
|
|
c.colorspace = V4L2_COLORSPACE_OPRGB;
|
|
c.xfer_func = V4L2_XFER_FUNC_OPRGB;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_BT2020:
|
|
c.colorspace = V4L2_COLORSPACE_BT2020;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
switch (avi->quantization_range) {
|
|
case HDMI_QUANTIZATION_RANGE_LIMITED:
|
|
c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
|
|
break;
|
|
case HDMI_QUANTIZATION_RANGE_FULL:
|
|
break;
|
|
default:
|
|
if (default_is_lim_range_rgb)
|
|
c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
|
|
break;
|
|
}
|
|
break;
|
|
|
|
default:
|
|
/* YCbCr pixel encoding */
|
|
c.quantization = V4L2_QUANTIZATION_LIM_RANGE;
|
|
switch (avi->colorimetry) {
|
|
case HDMI_COLORIMETRY_NONE:
|
|
if (!is_ce)
|
|
break;
|
|
if (is_sdtv) {
|
|
c.colorspace = V4L2_COLORSPACE_SMPTE170M;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_601;
|
|
} else {
|
|
c.colorspace = V4L2_COLORSPACE_REC709;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_709;
|
|
}
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_COLORIMETRY_ITU_601:
|
|
c.colorspace = V4L2_COLORSPACE_SMPTE170M;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_601;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_COLORIMETRY_ITU_709:
|
|
c.colorspace = V4L2_COLORSPACE_REC709;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_709;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_COLORIMETRY_EXTENDED:
|
|
switch (avi->extended_colorimetry) {
|
|
case HDMI_EXTENDED_COLORIMETRY_XV_YCC_601:
|
|
c.colorspace = V4L2_COLORSPACE_REC709;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_XV709;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_XV_YCC_709:
|
|
c.colorspace = V4L2_COLORSPACE_REC709;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_XV601;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_S_YCC_601:
|
|
c.colorspace = V4L2_COLORSPACE_SRGB;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_601;
|
|
c.xfer_func = V4L2_XFER_FUNC_SRGB;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_OPYCC_601:
|
|
c.colorspace = V4L2_COLORSPACE_OPRGB;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_601;
|
|
c.xfer_func = V4L2_XFER_FUNC_OPRGB;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_BT2020:
|
|
c.colorspace = V4L2_COLORSPACE_BT2020;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
case HDMI_EXTENDED_COLORIMETRY_BT2020_CONST_LUM:
|
|
c.colorspace = V4L2_COLORSPACE_BT2020;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_BT2020_CONST_LUM;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
default: /* fall back to ITU_709 */
|
|
c.colorspace = V4L2_COLORSPACE_REC709;
|
|
c.ycbcr_enc = V4L2_YCBCR_ENC_709;
|
|
c.xfer_func = V4L2_XFER_FUNC_709;
|
|
break;
|
|
}
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
/*
|
|
* YCC Quantization Range signaling is more-or-less broken,
|
|
* let's just ignore this.
|
|
*/
|
|
break;
|
|
}
|
|
return c;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_hdmi_rx_colorimetry);
|
|
|
|
/**
|
|
* v4l2_get_edid_phys_addr() - find and return the physical address
|
|
*
|
|
* @edid: pointer to the EDID data
|
|
* @size: size in bytes of the EDID data
|
|
* @offset: If not %NULL then the location of the physical address
|
|
* bytes in the EDID will be returned here. This is set to 0
|
|
* if there is no physical address found.
|
|
*
|
|
* Return: the physical address or CEC_PHYS_ADDR_INVALID if there is none.
|
|
*/
|
|
u16 v4l2_get_edid_phys_addr(const u8 *edid, unsigned int size,
|
|
unsigned int *offset)
|
|
{
|
|
unsigned int loc = cec_get_edid_spa_location(edid, size);
|
|
|
|
if (offset)
|
|
*offset = loc;
|
|
if (loc == 0)
|
|
return CEC_PHYS_ADDR_INVALID;
|
|
return (edid[loc] << 8) | edid[loc + 1];
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_get_edid_phys_addr);
|
|
|
|
/**
|
|
* v4l2_set_edid_phys_addr() - find and set the physical address
|
|
*
|
|
* @edid: pointer to the EDID data
|
|
* @size: size in bytes of the EDID data
|
|
* @phys_addr: the new physical address
|
|
*
|
|
* This function finds the location of the physical address in the EDID
|
|
* and fills in the given physical address and updates the checksum
|
|
* at the end of the EDID block. It does nothing if the EDID doesn't
|
|
* contain a physical address.
|
|
*/
|
|
void v4l2_set_edid_phys_addr(u8 *edid, unsigned int size, u16 phys_addr)
|
|
{
|
|
unsigned int loc = cec_get_edid_spa_location(edid, size);
|
|
u8 sum = 0;
|
|
unsigned int i;
|
|
|
|
if (loc == 0)
|
|
return;
|
|
edid[loc] = phys_addr >> 8;
|
|
edid[loc + 1] = phys_addr & 0xff;
|
|
loc &= ~0x7f;
|
|
|
|
/* update the checksum */
|
|
for (i = loc; i < loc + 127; i++)
|
|
sum += edid[i];
|
|
edid[i] = 256 - sum;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_set_edid_phys_addr);
|
|
|
|
/**
|
|
* v4l2_phys_addr_for_input() - calculate the PA for an input
|
|
*
|
|
* @phys_addr: the physical address of the parent
|
|
* @input: the number of the input port, must be between 1 and 15
|
|
*
|
|
* This function calculates a new physical address based on the input
|
|
* port number. For example:
|
|
*
|
|
* PA = 0.0.0.0 and input = 2 becomes 2.0.0.0
|
|
*
|
|
* PA = 3.0.0.0 and input = 1 becomes 3.1.0.0
|
|
*
|
|
* PA = 3.2.1.0 and input = 5 becomes 3.2.1.5
|
|
*
|
|
* PA = 3.2.1.3 and input = 5 becomes f.f.f.f since it maxed out the depth.
|
|
*
|
|
* Return: the new physical address or CEC_PHYS_ADDR_INVALID.
|
|
*/
|
|
u16 v4l2_phys_addr_for_input(u16 phys_addr, u8 input)
|
|
{
|
|
/* Check if input is sane */
|
|
if (WARN_ON(input == 0 || input > 0xf))
|
|
return CEC_PHYS_ADDR_INVALID;
|
|
|
|
if (phys_addr == 0)
|
|
return input << 12;
|
|
|
|
if ((phys_addr & 0x0fff) == 0)
|
|
return phys_addr | (input << 8);
|
|
|
|
if ((phys_addr & 0x00ff) == 0)
|
|
return phys_addr | (input << 4);
|
|
|
|
if ((phys_addr & 0x000f) == 0)
|
|
return phys_addr | input;
|
|
|
|
/*
|
|
* All nibbles are used so no valid physical addresses can be assigned
|
|
* to the input.
|
|
*/
|
|
return CEC_PHYS_ADDR_INVALID;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_phys_addr_for_input);
|
|
|
|
/**
|
|
* v4l2_phys_addr_validate() - validate a physical address from an EDID
|
|
*
|
|
* @phys_addr: the physical address to validate
|
|
* @parent: if not %NULL, then this is filled with the parents PA.
|
|
* @port: if not %NULL, then this is filled with the input port.
|
|
*
|
|
* This validates a physical address as read from an EDID. If the
|
|
* PA is invalid (such as 1.0.1.0 since '0' is only allowed at the end),
|
|
* then it will return -EINVAL.
|
|
*
|
|
* The parent PA is passed into %parent and the input port is passed into
|
|
* %port. For example:
|
|
*
|
|
* PA = 0.0.0.0: has parent 0.0.0.0 and input port 0.
|
|
*
|
|
* PA = 1.0.0.0: has parent 0.0.0.0 and input port 1.
|
|
*
|
|
* PA = 3.2.0.0: has parent 3.0.0.0 and input port 2.
|
|
*
|
|
* PA = f.f.f.f: has parent f.f.f.f and input port 0.
|
|
*
|
|
* Return: 0 if the PA is valid, -EINVAL if not.
|
|
*/
|
|
int v4l2_phys_addr_validate(u16 phys_addr, u16 *parent, u16 *port)
|
|
{
|
|
int i;
|
|
|
|
if (parent)
|
|
*parent = phys_addr;
|
|
if (port)
|
|
*port = 0;
|
|
if (phys_addr == CEC_PHYS_ADDR_INVALID)
|
|
return 0;
|
|
for (i = 0; i < 16; i += 4)
|
|
if (phys_addr & (0xf << i))
|
|
break;
|
|
if (i == 16)
|
|
return 0;
|
|
if (parent)
|
|
*parent = phys_addr & (0xfff0 << i);
|
|
if (port)
|
|
*port = (phys_addr >> i) & 0xf;
|
|
for (i += 4; i < 16; i += 4)
|
|
if ((phys_addr & (0xf << i)) == 0)
|
|
return -EINVAL;
|
|
return 0;
|
|
}
|
|
EXPORT_SYMBOL_GPL(v4l2_phys_addr_validate);
|