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backend/drm: use libdisplay-info for CVT mode generation

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Simon Ser 2023-02-02 13:41:40 +01:00 • committed by Alexander Orzechowski
parent 35da997001
commit a160304289
6 changed files with 38 additions and 285 deletions
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35
backend/drm/util.c
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@ -3,6 +3,7 @@
#include <drm_fourcc.h>
#include <drm_mode.h>
#include <drm.h>
#include <libdisplay-info/cvt.h>
#include <libdisplay-info/edid.h>
#include <libdisplay-info/info.h>
#include <stdio.h>
@ -241,3 +242,37 @@ size_t match_obj(size_t num_objs, const uint32_t objs[static restrict num_objs],
match_obj_(&st, 0, 0, 0, 0);
return st.score;
}
void generate_cvt_mode(drmModeModeInfo *mode, int hdisplay, int vdisplay,
float vrefresh) {
// TODO: depending on capabilities advertised in the EDID, use reduced
// blanking if possible (and update sync polarity)
struct di_cvt_options options = {
.red_blank_ver = DI_CVT_REDUCED_BLANKING_NONE,
.h_pixels = hdisplay,
.v_lines = vdisplay,
.ip_freq_rqd = vrefresh ? vrefresh : 60,
};
struct di_cvt_timing timing;
di_cvt_compute(&timing, &options);
uint16_t hsync_start = hdisplay + timing.h_front_porch;
uint16_t vsync_start = timing.v_lines_rnd + timing.v_front_porch;
uint16_t hsync_end = hsync_start + timing.h_sync;
uint16_t vsync_end = vsync_start + timing.v_sync;
*mode = (drmModeModeInfo){
.clock = roundf(timing.act_pixel_freq * 1000),
.hdisplay = hdisplay,
.vdisplay = timing.v_lines_rnd,
.hsync_start = hsync_start,
.vsync_start = vsync_start,
.hsync_end = hsync_end,
.vsync_end = vsync_end,
.htotal = hsync_end + timing.h_back_porch,
.vtotal = vsync_end + timing.v_back_porch,
.vrefresh = roundf(timing.act_frame_rate),
.flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC,
};
snprintf(mode->name, sizeof(mode->name), "%dx%d", hdisplay, vdisplay);
}