diff options
Diffstat (limited to 'drivers/media/v4l2-core/v4l2-dv-timings.c')
| -rw-r--r-- | drivers/media/v4l2-core/v4l2-dv-timings.c | 609 |
1 files changed, 609 insertions, 0 deletions
diff --git a/drivers/media/v4l2-core/v4l2-dv-timings.c b/drivers/media/v4l2-core/v4l2-dv-timings.c new file mode 100644 index 000000000000..ee52b9f4a944 --- /dev/null +++ b/drivers/media/v4l2-core/v4l2-dv-timings.c @@ -0,0 +1,609 @@ +/* + * v4l2-dv-timings - dv-timings helper functions + * + * Copyright 2013 Cisco Systems, Inc. and/or its affiliates. All rights reserved. + * + * This program is free software; you may redistribute it and/or modify + * it under the terms of the GNU General Public License as published by + * the Free Software Foundation; version 2 of the License. + * + * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, + * EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF + * MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND + * NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS + * BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN + * ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN + * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE + * SOFTWARE. + * + */ + +#include <linux/module.h> +#include <linux/types.h> +#include <linux/kernel.h> +#include <linux/errno.h> +#include <linux/videodev2.h> +#include <linux/v4l2-dv-timings.h> +#include <media/v4l2-dv-timings.h> + +const struct v4l2_dv_timings v4l2_dv_timings_presets[] = { + V4L2_DV_BT_CEA_640X480P59_94, + V4L2_DV_BT_CEA_720X480I59_94, + V4L2_DV_BT_CEA_720X480P59_94, + V4L2_DV_BT_CEA_720X576I50, + V4L2_DV_BT_CEA_720X576P50, + V4L2_DV_BT_CEA_1280X720P24, + V4L2_DV_BT_CEA_1280X720P25, + V4L2_DV_BT_CEA_1280X720P30, + V4L2_DV_BT_CEA_1280X720P50, + V4L2_DV_BT_CEA_1280X720P60, + V4L2_DV_BT_CEA_1920X1080P24, + V4L2_DV_BT_CEA_1920X1080P25, + V4L2_DV_BT_CEA_1920X1080P30, + V4L2_DV_BT_CEA_1920X1080I50, + V4L2_DV_BT_CEA_1920X1080P50, + V4L2_DV_BT_CEA_1920X1080I60, + V4L2_DV_BT_CEA_1920X1080P60, + V4L2_DV_BT_DMT_640X350P85, + V4L2_DV_BT_DMT_640X400P85, + V4L2_DV_BT_DMT_720X400P85, + V4L2_DV_BT_DMT_640X480P72, + V4L2_DV_BT_DMT_640X480P75, + V4L2_DV_BT_DMT_640X480P85, + V4L2_DV_BT_DMT_800X600P56, + V4L2_DV_BT_DMT_800X600P60, + V4L2_DV_BT_DMT_800X600P72, + V4L2_DV_BT_DMT_800X600P75, + V4L2_DV_BT_DMT_800X600P85, + V4L2_DV_BT_DMT_800X600P120_RB, + V4L2_DV_BT_DMT_848X480P60, + V4L2_DV_BT_DMT_1024X768I43, + V4L2_DV_BT_DMT_1024X768P60, + V4L2_DV_BT_DMT_1024X768P70, + V4L2_DV_BT_DMT_1024X768P75, + V4L2_DV_BT_DMT_1024X768P85, + V4L2_DV_BT_DMT_1024X768P120_RB, + V4L2_DV_BT_DMT_1152X864P75, + V4L2_DV_BT_DMT_1280X768P60_RB, + V4L2_DV_BT_DMT_1280X768P60, + V4L2_DV_BT_DMT_1280X768P75, + V4L2_DV_BT_DMT_1280X768P85, + V4L2_DV_BT_DMT_1280X768P120_RB, + V4L2_DV_BT_DMT_1280X800P60_RB, + V4L2_DV_BT_DMT_1280X800P60, + V4L2_DV_BT_DMT_1280X800P75, + V4L2_DV_BT_DMT_1280X800P85, + V4L2_DV_BT_DMT_1280X800P120_RB, + V4L2_DV_BT_DMT_1280X960P60, + V4L2_DV_BT_DMT_1280X960P85, + V4L2_DV_BT_DMT_1280X960P120_RB, + V4L2_DV_BT_DMT_1280X1024P60, + V4L2_DV_BT_DMT_1280X1024P75, + V4L2_DV_BT_DMT_1280X1024P85, + V4L2_DV_BT_DMT_1280X1024P120_RB, + V4L2_DV_BT_DMT_1360X768P60, + V4L2_DV_BT_DMT_1360X768P120_RB, + V4L2_DV_BT_DMT_1366X768P60, + V4L2_DV_BT_DMT_1366X768P60_RB, + V4L2_DV_BT_DMT_1400X1050P60_RB, + V4L2_DV_BT_DMT_1400X1050P60, + V4L2_DV_BT_DMT_1400X1050P75, + V4L2_DV_BT_DMT_1400X1050P85, + V4L2_DV_BT_DMT_1400X1050P120_RB, + V4L2_DV_BT_DMT_1440X900P60_RB, + V4L2_DV_BT_DMT_1440X900P60, + V4L2_DV_BT_DMT_1440X900P75, + V4L2_DV_BT_DMT_1440X900P85, + V4L2_DV_BT_DMT_1440X900P120_RB, + V4L2_DV_BT_DMT_1600X900P60_RB, + V4L2_DV_BT_DMT_1600X1200P60, + V4L2_DV_BT_DMT_1600X1200P65, + V4L2_DV_BT_DMT_1600X1200P70, + V4L2_DV_BT_DMT_1600X1200P75, + V4L2_DV_BT_DMT_1600X1200P85, + V4L2_DV_BT_DMT_1600X1200P120_RB, + V4L2_DV_BT_DMT_1680X1050P60_RB, + V4L2_DV_BT_DMT_1680X1050P60, + V4L2_DV_BT_DMT_1680X1050P75, + V4L2_DV_BT_DMT_1680X1050P85, + V4L2_DV_BT_DMT_1680X1050P120_RB, + V4L2_DV_BT_DMT_1792X1344P60, + V4L2_DV_BT_DMT_1792X1344P75, + V4L2_DV_BT_DMT_1792X1344P120_RB, + V4L2_DV_BT_DMT_1856X1392P60, + V4L2_DV_BT_DMT_1856X1392P75, + V4L2_DV_BT_DMT_1856X1392P120_RB, + V4L2_DV_BT_DMT_1920X1200P60_RB, + V4L2_DV_BT_DMT_1920X1200P60, + V4L2_DV_BT_DMT_1920X1200P75, + V4L2_DV_BT_DMT_1920X1200P85, + V4L2_DV_BT_DMT_1920X1200P120_RB, + V4L2_DV_BT_DMT_1920X1440P60, + V4L2_DV_BT_DMT_1920X1440P75, + V4L2_DV_BT_DMT_1920X1440P120_RB, + V4L2_DV_BT_DMT_2048X1152P60_RB, + V4L2_DV_BT_DMT_2560X1600P60_RB, + V4L2_DV_BT_DMT_2560X1600P60, + V4L2_DV_BT_DMT_2560X1600P75, + V4L2_DV_BT_DMT_2560X1600P85, + V4L2_DV_BT_DMT_2560X1600P120_RB, + { } +}; +EXPORT_SYMBOL_GPL(v4l2_dv_timings_presets); + +bool v4l2_valid_dv_timings(const struct v4l2_dv_timings *t, + const struct v4l2_dv_timings_cap *dvcap, + v4l2_check_dv_timings_fnc fnc, + void *fnc_handle) +{ + const struct v4l2_bt_timings *bt = &t->bt; + const struct v4l2_bt_timings_cap *cap = &dvcap->bt; + u32 caps = cap->capabilities; + + if (t->type != V4L2_DV_BT_656_1120) + return false; + if (t->type != dvcap->type || + bt->height < cap->min_height || + bt->height > cap->max_height || + bt->width < cap->min_width || + bt->width > cap->max_width || + bt->pixelclock < cap->min_pixelclock || + bt->pixelclock > cap->max_pixelclock || + (cap->standards && !(bt->standards & cap->standards)) || + (bt->interlaced && !(caps & V4L2_DV_BT_CAP_INTERLACED)) || + (!bt->interlaced && !(caps & V4L2_DV_BT_CAP_PROGRESSIVE))) + return false; + return fnc == NULL || fnc(t, fnc_handle); +} +EXPORT_SYMBOL_GPL(v4l2_valid_dv_timings); + +int v4l2_enum_dv_timings_cap(struct v4l2_enum_dv_timings *t, + const struct v4l2_dv_timings_cap *cap, + v4l2_check_dv_timings_fnc fnc, + void *fnc_handle) +{ + u32 i, idx; + + memset(t->reserved, 0, sizeof(t->reserved)); + for (i = idx = 0; v4l2_dv_timings_presets[i].bt.width; i++) { + if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap, + fnc, fnc_handle) && + idx++ == t->index) { + t->timings = v4l2_dv_timings_presets[i]; + return 0; + } + } + return -EINVAL; +} +EXPORT_SYMBOL_GPL(v4l2_enum_dv_timings_cap); + +bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t, + const struct v4l2_dv_timings_cap *cap, + unsigned pclock_delta, + v4l2_check_dv_timings_fnc fnc, + void *fnc_handle) +{ + int i; + + if (!v4l2_valid_dv_timings(t, cap, fnc, fnc_handle)) + return false; + + for (i = 0; i < v4l2_dv_timings_presets[i].bt.width; i++) { + if (v4l2_valid_dv_timings(v4l2_dv_timings_presets + i, cap, + fnc, fnc_handle) && + v4l2_match_dv_timings(t, v4l2_dv_timings_presets + i, + pclock_delta)) { + *t = v4l2_dv_timings_presets[i]; + return true; + } + } + return false; +} +EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap); + +/** + * v4l2_match_dv_timings - check if two timings match + * @t1 - compare this v4l2_dv_timings struct... + * @t2 - with this struct. + * @pclock_delta - the allowed pixelclock deviation. + * + * Compare t1 with t2 with a given margin of error for the pixelclock. + */ +bool v4l2_match_dv_timings(const struct v4l2_dv_timings *t1, + const struct v4l2_dv_timings *t2, + unsigned pclock_delta) +{ + if (t1->type != t2->type || t1->type != V4L2_DV_BT_656_1120) + return false; + if (t1->bt.width == t2->bt.width && + t1->bt.height == t2->bt.height && + t1->bt.interlaced == t2->bt.interlaced && + t1->bt.polarities == t2->bt.polarities && + t1->bt.pixelclock >= t2->bt.pixelclock - pclock_delta && + t1->bt.pixelclock <= t2->bt.pixelclock + pclock_delta && + t1->bt.hfrontporch == t2->bt.hfrontporch && + t1->bt.vfrontporch == t2->bt.vfrontporch && + t1->bt.vsync == t2->bt.vsync && + t1->bt.vbackporch == t2->bt.vbackporch && + (!t1->bt.interlaced || + (t1->bt.il_vfrontporch == t2->bt.il_vfrontporch && + t1->bt.il_vsync == t2->bt.il_vsync && + t1->bt.il_vbackporch == t2->bt.il_vbackporch))) + return true; + return false; +} +EXPORT_SYMBOL_GPL(v4l2_match_dv_timings); + +void v4l2_print_dv_timings(const char *dev_prefix, const char *prefix, + const struct v4l2_dv_timings *t, bool detailed) +{ + const struct v4l2_bt_timings *bt = &t->bt; + u32 htot, vtot; + + if (t->type != V4L2_DV_BT_656_1120) + return; + + htot = V4L2_DV_BT_FRAME_WIDTH(bt); + vtot = V4L2_DV_BT_FRAME_HEIGHT(bt); + + if (prefix == NULL) + prefix = ""; + + pr_info("%s: %s%ux%u%s%u (%ux%u)\n", dev_prefix, prefix, + bt->width, bt->height, bt->interlaced ? "i" : "p", + (htot * vtot) > 0 ? ((u32)bt->pixelclock / (htot * vtot)) : 0, + htot, vtot); + + if (!detailed) + return; + + pr_info("%s: horizontal: fp = %u, %ssync = %u, bp = %u\n", + dev_prefix, bt->hfrontporch, + (bt->polarities & V4L2_DV_HSYNC_POS_POL) ? "+" : "-", + bt->hsync, bt->hbackporch); + pr_info("%s: vertical: fp = %u, %ssync = %u, bp = %u\n", + dev_prefix, bt->vfrontporch, + (bt->polarities & V4L2_DV_VSYNC_POS_POL) ? "+" : "-", + bt->vsync, bt->vbackporch); + pr_info("%s: pixelclock: %llu\n", dev_prefix, bt->pixelclock); + pr_info("%s: flags (0x%x):%s%s%s%s\n", dev_prefix, bt->flags, + (bt->flags & V4L2_DV_FL_REDUCED_BLANKING) ? + " REDUCED_BLANKING" : "", + (bt->flags & V4L2_DV_FL_CAN_REDUCE_FPS) ? + " CAN_REDUCE_FPS" : "", + (bt->flags & V4L2_DV_FL_REDUCED_FPS) ? + " REDUCED_FPS" : "", + (bt->flags & V4L2_DV_FL_HALF_LINE) ? + " HALF_LINE" : ""); + pr_info("%s: standards (0x%x):%s%s%s%s\n", dev_prefix, bt->standards, + (bt->standards & V4L2_DV_BT_STD_CEA861) ? " CEA" : "", + (bt->standards & V4L2_DV_BT_STD_DMT) ? " DMT" : "", + (bt->standards & V4L2_DV_BT_STD_CVT) ? " CVT" : "", + (bt->standards & V4L2_DV_BT_STD_GTF) ? " GTF" : ""); +} +EXPORT_SYMBOL_GPL(v4l2_print_dv_timings); + +/* + * CVT defines + * Based on Coordinated Video Timings Standard + * version 1.1 September 10, 2003 + */ + +#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */ + +/* 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) */ + +/* 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_BPORCH 80 /* pixels */ +#define CVT_RB_H_BLANK 160 /* pixels */ + +/** 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. + * @polarities - the horizontal and vertical polarities (same as struct + * v4l2_bt_timings polarities). + * @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, + u32 polarities, 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; + unsigned pix_clk; + + if (vsync < 4 || vsync > 7) + 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; + + /* Vertical */ + if (reduced_blanking) { + v_fp = CVT_RB_V_FPORCH; + v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 1999999) / 1000000; + 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 + 1999999) / 1000000 - vsync; + + if (v_bp < CVT_MIN_V_BPORCH) + v_bp = CVT_MIN_V_BPORCH; + } + image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + + /* 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; + default: + return false; + } + + image_width = image_width & ~7; + + /* Horizontal */ + if (reduced_blanking) { + pix_clk = (image_width + CVT_RB_H_BLANK) * hfreq; + pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN; + + h_bp = CVT_RB_H_BPORCH; + hsync = CVT_RB_H_SYNC; + h_fp = CVT_RB_H_BLANK - h_bp - hsync; + + frame_width = image_width + CVT_RB_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 * 8 + 50) / 100; + hsync = hsync - hsync % 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; + fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; + 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). + * @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, + 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; + + /* Vertical */ + v_fp = GTF_V_FP; + v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync; + image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1; + + if (aspect.numerator == 0 || aspect.denominator == 0) { + aspect.numerator = 16; + aspect.denominator = 9; + } + image_width = ((image_height * aspect.numerator) / aspect.denominator); + + /* Horizontal */ + if (default_gtf) + h_blank = ((image_width * GTF_D_C_PRIME * hfreq) - + (image_width * GTF_D_M_PRIME * 1000) + + (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) / + (hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000); + else + h_blank = ((image_width * GTF_S_C_PRIME * hfreq) - + (image_width * GTF_S_M_PRIME * 1000) + + (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) / + (hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000); + + h_blank = h_blank - 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 = hsync - hsync % 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; + fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync; + 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 }; + u32 tmp; + 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.numerator = 3; + } else if (ratio == 68) { + aspect.numerator = 15; + aspect.numerator = 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 */ + tmp = aspect.denominator; + aspect.denominator = aspect.numerator; + aspect.numerator = tmp; + return aspect; +} +EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio); |