[media] v4l2: move dv-timings related code to v4l2-dv-timings.c
v4l2-common.c contained a bunch of dv-timings related functions. Move that to the new v4l2-dv-timings.c which is a more appropriate place for them. There aren't many drivers that do HDTV, so it is a good idea to separate common code related to that into a module of its own. Signed-off-by: Hans Verkuil <hans.verkuil@cisco.com> Acked-by: Lad, Prabhakar <prabhakar.csengg@gmail.com> Signed-off-by: Mauro Carvalho Chehab <m.chehab@samsung.com>
This commit is contained in:
Hans Verkuil
Mauro Carvalho Chehab
parent
b18787ed1c
commit
2576415846
8 changed files with 420 additions and 371 deletions
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@ -33,6 +33,7 @@
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#include <linux/v4l2-dv-timings.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-dv-timings.h>
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#include <media/v4l2-ctrls.h>
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#include <media/ad9389b.h>
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@ -38,6 +38,7 @@
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#include <linux/v4l2-dv-timings.h>
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#include <media/v4l2-device.h>
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#include <media/v4l2-ctrls.h>
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#include <media/v4l2-dv-timings.h>
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#include <media/adv7604.h>
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static int debug;
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@ -21,6 +21,7 @@
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#include <linux/module.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 <media/v4l2-async.h>
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#include <media/v4l2-device.h>
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@ -24,6 +24,7 @@
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#include <linux/v4l2-dv-timings.h>
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#include <media/v4l2-dev.h>
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#include <media/v4l2-common.h>
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#include <media/v4l2-dv-timings.h>
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#include <media/v4l2-ioctl.h>
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#include <media/v4l2-event.h>
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#include "hdpvr.h"
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@ -495,363 +495,6 @@ void v4l_bound_align_image(u32 *w, unsigned int wmin, unsigned int wmax,
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}
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EXPORT_SYMBOL_GPL(v4l_bound_align_image);
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/**
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* v4l_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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*
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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 v4l_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)
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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.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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(!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(v4l_match_dv_timings);
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/*
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* CVT defines
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* Based on Coordinated Video Timings Standard
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* version 1.1 September 10, 2003
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*/
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#define CVT_PXL_CLK_GRAN 250000 /* pixel clock granularity */
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/* Normal blanking */
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#define CVT_MIN_V_BPORCH 7 /* lines */
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#define CVT_MIN_V_PORCH_RND 3 /* lines */
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#define CVT_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
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/* Normal blanking for CVT uses GTF to calculate horizontal blanking */
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#define CVT_CELL_GRAN 8 /* character cell granularity */
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#define CVT_M 600 /* blanking formula gradient */
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#define CVT_C 40 /* blanking formula offset */
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#define CVT_K 128 /* blanking formula scaling factor */
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#define CVT_J 20 /* blanking formula scaling factor */
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#define CVT_C_PRIME (((CVT_C - CVT_J) * CVT_K / 256) + CVT_J)
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#define CVT_M_PRIME (CVT_K * CVT_M / 256)
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/* Reduced Blanking */
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#define CVT_RB_MIN_V_BPORCH 7 /* lines */
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#define CVT_RB_V_FPORCH 3 /* lines */
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#define CVT_RB_MIN_V_BLANK 460 /* us */
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#define CVT_RB_H_SYNC 32 /* pixels */
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#define CVT_RB_H_BPORCH 80 /* pixels */
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#define CVT_RB_H_BLANK 160 /* pixels */
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/** v4l2_detect_cvt - detect if the given timings follow the CVT standard
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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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* @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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u32 polarities, struct v4l2_dv_timings *fmt)
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{
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int v_fp, v_bp, h_fp, h_bp, hsync;
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int frame_width, image_height, image_width;
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bool reduced_blanking;
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unsigned pix_clk;
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if (vsync < 4 || vsync > 7)
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return false;
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if (polarities == V4L2_DV_VSYNC_POS_POL)
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reduced_blanking = false;
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else if (polarities == V4L2_DV_HSYNC_POS_POL)
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reduced_blanking = true;
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else
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return false;
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/* Vertical */
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if (reduced_blanking) {
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v_fp = CVT_RB_V_FPORCH;
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v_bp = (CVT_RB_MIN_V_BLANK * hfreq + 999999) / 1000000;
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v_bp -= vsync + v_fp;
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if (v_bp < CVT_RB_MIN_V_BPORCH)
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v_bp = CVT_RB_MIN_V_BPORCH;
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} else {
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v_fp = CVT_MIN_V_PORCH_RND;
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v_bp = (CVT_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync;
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if (v_bp < CVT_MIN_V_BPORCH)
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v_bp = CVT_MIN_V_BPORCH;
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}
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image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
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/* Aspect ratio based on vsync */
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switch (vsync) {
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case 4:
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image_width = (image_height * 4) / 3;
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break;
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case 5:
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image_width = (image_height * 16) / 9;
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break;
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case 6:
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image_width = (image_height * 16) / 10;
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break;
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case 7:
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/* special case */
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if (image_height == 1024)
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image_width = (image_height * 5) / 4;
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else if (image_height == 768)
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image_width = (image_height * 15) / 9;
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else
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return false;
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break;
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default:
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return false;
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}
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image_width = image_width & ~7;
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/* Horizontal */
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if (reduced_blanking) {
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pix_clk = (image_width + CVT_RB_H_BLANK) * hfreq;
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pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
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h_bp = CVT_RB_H_BPORCH;
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hsync = CVT_RB_H_SYNC;
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h_fp = CVT_RB_H_BLANK - h_bp - hsync;
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frame_width = image_width + CVT_RB_H_BLANK;
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} else {
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int h_blank;
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unsigned ideal_duty_cycle = CVT_C_PRIME - (CVT_M_PRIME * 1000) / hfreq;
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h_blank = (image_width * ideal_duty_cycle + (100 - ideal_duty_cycle) / 2) /
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(100 - ideal_duty_cycle);
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h_blank = h_blank - h_blank % (2 * CVT_CELL_GRAN);
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if (h_blank * 100 / image_width < 20) {
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h_blank = image_width / 5;
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h_blank = (h_blank + 0x7) & ~0x7;
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}
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pix_clk = (image_width + h_blank) * hfreq;
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pix_clk = (pix_clk / CVT_PXL_CLK_GRAN) * CVT_PXL_CLK_GRAN;
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h_bp = h_blank / 2;
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frame_width = image_width + h_blank;
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hsync = (frame_width * 8 + 50) / 100;
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hsync = hsync - hsync % CVT_CELL_GRAN;
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h_fp = h_blank - hsync - h_bp;
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}
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fmt->bt.polarities = polarities;
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fmt->bt.width = image_width;
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fmt->bt.height = image_height;
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fmt->bt.hfrontporch = h_fp;
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fmt->bt.vfrontporch = v_fp;
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fmt->bt.hsync = hsync;
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fmt->bt.vsync = vsync;
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fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
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fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
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fmt->bt.pixelclock = pix_clk;
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fmt->bt.standards = V4L2_DV_BT_STD_CVT;
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if (reduced_blanking)
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fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
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return true;
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}
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EXPORT_SYMBOL_GPL(v4l2_detect_cvt);
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/*
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* GTF defines
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* Based on Generalized Timing Formula Standard
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* Version 1.1 September 2, 1999
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*/
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#define GTF_PXL_CLK_GRAN 250000 /* pixel clock granularity */
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#define GTF_MIN_VSYNC_BP 550 /* min time of vsync + back porch (us) */
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#define GTF_V_FP 1 /* vertical front porch (lines) */
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#define GTF_CELL_GRAN 8 /* character cell granularity */
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/* Default */
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#define GTF_D_M 600 /* blanking formula gradient */
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#define GTF_D_C 40 /* blanking formula offset */
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#define GTF_D_K 128 /* blanking formula scaling factor */
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#define GTF_D_J 20 /* blanking formula scaling factor */
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#define GTF_D_C_PRIME ((((GTF_D_C - GTF_D_J) * GTF_D_K) / 256) + GTF_D_J)
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#define GTF_D_M_PRIME ((GTF_D_K * GTF_D_M) / 256)
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/* Secondary */
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#define GTF_S_M 3600 /* blanking formula gradient */
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#define GTF_S_C 40 /* blanking formula offset */
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#define GTF_S_K 128 /* blanking formula scaling factor */
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#define GTF_S_J 35 /* blanking formula scaling factor */
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#define GTF_S_C_PRIME ((((GTF_S_C - GTF_S_J) * GTF_S_K) / 256) + GTF_S_J)
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#define GTF_S_M_PRIME ((GTF_S_K * GTF_S_M) / 256)
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/** v4l2_detect_gtf - detect if the given timings follow the GTF standard
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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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* @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,
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unsigned hfreq,
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unsigned vsync,
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u32 polarities,
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struct v4l2_fract aspect,
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struct v4l2_dv_timings *fmt)
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{
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int pix_clk;
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int v_fp, v_bp, h_fp, hsync;
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int frame_width, image_height, image_width;
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bool default_gtf;
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int h_blank;
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if (vsync != 3)
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return false;
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if (polarities == V4L2_DV_VSYNC_POS_POL)
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default_gtf = true;
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else if (polarities == V4L2_DV_HSYNC_POS_POL)
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default_gtf = false;
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else
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return false;
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/* Vertical */
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v_fp = GTF_V_FP;
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v_bp = (GTF_MIN_VSYNC_BP * hfreq + 999999) / 1000000 - vsync;
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image_height = (frame_height - v_fp - vsync - v_bp + 1) & ~0x1;
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if (aspect.numerator == 0 || aspect.denominator == 0) {
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aspect.numerator = 16;
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aspect.denominator = 9;
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}
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image_width = ((image_height * aspect.numerator) / aspect.denominator);
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/* Horizontal */
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if (default_gtf)
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h_blank = ((image_width * GTF_D_C_PRIME * hfreq) -
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(image_width * GTF_D_M_PRIME * 1000) +
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(hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000) / 2) /
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(hfreq * (100 - GTF_D_C_PRIME) + GTF_D_M_PRIME * 1000);
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else
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h_blank = ((image_width * GTF_S_C_PRIME * hfreq) -
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(image_width * GTF_S_M_PRIME * 1000) +
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(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000) / 2) /
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(hfreq * (100 - GTF_S_C_PRIME) + GTF_S_M_PRIME * 1000);
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h_blank = h_blank - h_blank % (2 * GTF_CELL_GRAN);
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frame_width = image_width + h_blank;
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pix_clk = (image_width + h_blank) * hfreq;
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pix_clk = pix_clk / GTF_PXL_CLK_GRAN * GTF_PXL_CLK_GRAN;
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hsync = (frame_width * 8 + 50) / 100;
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hsync = hsync - hsync % GTF_CELL_GRAN;
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h_fp = h_blank / 2 - hsync;
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fmt->bt.polarities = polarities;
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fmt->bt.width = image_width;
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fmt->bt.height = image_height;
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fmt->bt.hfrontporch = h_fp;
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fmt->bt.vfrontporch = v_fp;
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fmt->bt.hsync = hsync;
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fmt->bt.vsync = vsync;
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fmt->bt.hbackporch = frame_width - image_width - h_fp - hsync;
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fmt->bt.vbackporch = frame_height - image_height - v_fp - vsync;
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fmt->bt.pixelclock = pix_clk;
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fmt->bt.standards = V4L2_DV_BT_STD_GTF;
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if (!default_gtf)
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fmt->bt.flags |= V4L2_DV_FL_REDUCED_BLANKING;
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return true;
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}
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EXPORT_SYMBOL_GPL(v4l2_detect_gtf);
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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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* @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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struct v4l2_fract aspect = { 16, 9 };
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u32 tmp;
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u8 ratio;
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/* Nothing filled in, fallback to 16:9 */
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if (!hor_landscape && !vert_portrait)
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return aspect;
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/* Both filled in, so they are interpreted as the screen size in cm */
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if (hor_landscape && vert_portrait) {
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aspect.numerator = hor_landscape;
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aspect.denominator = vert_portrait;
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return aspect;
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}
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/* Only one is filled in, so interpret them as a ratio:
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(val + 99) / 100 */
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ratio = hor_landscape | vert_portrait;
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/* Change some rounded values into the exact aspect ratio */
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if (ratio == 79) {
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aspect.numerator = 16;
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aspect.denominator = 9;
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} else if (ratio == 34) {
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aspect.numerator = 4;
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aspect.numerator = 3;
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} else if (ratio == 68) {
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aspect.numerator = 15;
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aspect.numerator = 9;
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} else {
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aspect.numerator = hor_landscape + 99;
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aspect.denominator = 100;
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}
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if (hor_landscape)
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return aspect;
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/* The aspect ratio is for portrait, so swap numerator and denominator */
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tmp = aspect.denominator;
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aspect.denominator = aspect.numerator;
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aspect.numerator = tmp;
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return aspect;
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}
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||||
EXPORT_SYMBOL_GPL(v4l2_calc_aspect_ratio);
|
||||
|
||||
const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
|
||||
const struct v4l2_discrete_probe *probe,
|
||||
s32 width, s32 height)
|
||||
|
|
|
|||
|
|
@ -24,7 +24,6 @@
|
|||
#include <linux/errno.h>
|
||||
#include <linux/videodev2.h>
|
||||
#include <linux/v4l2-dv-timings.h>
|
||||
#include <media/v4l2-common.h>
|
||||
#include <media/v4l2-dv-timings.h>
|
||||
|
||||
static const struct v4l2_dv_timings timings[] = {
|
||||
|
|
@ -190,3 +189,360 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
|
|||
return false;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(v4l2_find_dv_timings_cap);
|
||||
|
||||
/**
|
||||
* v4l_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 v4l_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(v4l_match_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 + 999999) / 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 + 999999) / 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 {
|
||||
int h_blank;
|
||||
unsigned ideal_duty_cycle = CVT_C_PRIME - (CVT_M_PRIME * 1000) / hfreq;
|
||||
|
||||
h_blank = (image_width * ideal_duty_cycle + (100 - ideal_duty_cycle) / 2) /
|
||||
(100 - ideal_duty_cycle);
|
||||
h_blank = h_blank - h_blank % (2 * CVT_CELL_GRAN);
|
||||
|
||||
if (h_blank * 100 / image_width < 20) {
|
||||
h_blank = image_width / 5;
|
||||
h_blank = (h_blank + 0x7) & ~0x7;
|
||||
}
|
||||
|
||||
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->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->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);
|
||||
|
|
|
|||
|
|
@ -201,19 +201,6 @@ const struct v4l2_frmsize_discrete *v4l2_find_nearest_format(
|
|||
const struct v4l2_discrete_probe *probe,
|
||||
s32 width, s32 height);
|
||||
|
||||
bool v4l_match_dv_timings(const struct v4l2_dv_timings *t1,
|
||||
const struct v4l2_dv_timings *t2,
|
||||
unsigned pclock_delta);
|
||||
|
||||
bool v4l2_detect_cvt(unsigned frame_height, unsigned hfreq, unsigned vsync,
|
||||
u32 polarities, struct v4l2_dv_timings *fmt);
|
||||
|
||||
bool v4l2_detect_gtf(unsigned frame_height, unsigned hfreq, unsigned vsync,
|
||||
u32 polarities, struct v4l2_fract aspect,
|
||||
struct v4l2_dv_timings *fmt);
|
||||
|
||||
struct v4l2_fract v4l2_calc_aspect_ratio(u8 hor_landscape, u8 vert_portrait);
|
||||
|
||||
void v4l2_get_timestamp(struct timeval *tv);
|
||||
|
||||
#endif /* V4L2_COMMON_H_ */
|
||||
|
|
|
|||
|
|
@ -64,4 +64,63 @@ bool v4l2_find_dv_timings_cap(struct v4l2_dv_timings *t,
|
|||
const struct v4l2_dv_timings_cap *cap,
|
||||
unsigned pclock_delta);
|
||||
|
||||
/** v4l_match_dv_timings() - do two timings match?
|
||||
* @measured: the measured timings data.
|
||||
* @standard: the timings according to the standard.
|
||||
* @pclock_delta: maximum delta in Hz between standard->pixelclock and
|
||||
* the measured timings.
|
||||
*
|
||||
* Returns true if the two timings match, returns false otherwise.
|
||||
*/
|
||||
bool v4l_match_dv_timings(const struct v4l2_dv_timings *measured,
|
||||
const struct v4l2_dv_timings *standard,
|
||||
unsigned pclock_delta);
|
||||
|
||||
/** 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);
|
||||
|
||||
/** 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);
|
||||
|
||||
/** 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);
|
||||
|
||||
#endif
|
||||
|
|
|
|||
Loading…
Reference in a new issue