aboutsummaryrefslogtreecommitdiff
path: root/backend
diff options
context:
space:
mode:
Diffstat (limited to 'backend')
-rw-r--r--backend/drm/cvt.c269
-rw-r--r--backend/drm/drm.c3
-rw-r--r--backend/drm/meson.build1
-rw-r--r--backend/drm/util.c35
4 files changed, 36 insertions, 272 deletions
diff --git a/backend/drm/cvt.c b/backend/drm/cvt.c
deleted file mode 100644
index 40f156b7..00000000
--- a/backend/drm/cvt.c
+++ /dev/null
@@ -1,269 +0,0 @@
-/*
- * Copyright 2005-2006 Luc Verhaegen.
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice shall be included in
- * all copies or substantial portions of the Software.
- *
- * 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 COPYRIGHT HOLDER(S) OR AUTHOR(S) 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 "backend/drm/cvt.h"
-
-/* top/bottom margin size (% of height) - default: 1.8 */
-#define CVT_MARGIN_PERCENTAGE 1.8
-
-/* character cell horizontal granularity (pixels) - default 8 */
-#define CVT_H_GRANULARITY 8
-
-/* Minimum vertical porch (lines) - default 3 */
-#define CVT_MIN_V_PORCH 3
-
-/* Minimum number of vertical back porch lines - default 6 */
-#define CVT_MIN_V_BPORCH 6
-
-/* Pixel clock step (kHz) */
-#define CVT_CLOCK_STEP 250
-
-/* Minimum time of vertical sync + back porch interval (µs)
- * default 550.0 */
-#define CVT_MIN_VSYNC_BP 550.0
-
-/* Nominal hsync width (% of line period) - default 8 */
-#define CVT_HSYNC_PERCENTAGE 8
-
-/* Definition of Horizontal blanking time limitation */
-/* Gradient (%/kHz) - default 600 */
-#define CVT_M_FACTOR 600
-
-/* Offset (%) - default 40 */
-#define CVT_C_FACTOR 40
-
-/* Blanking time scaling factor - default 128 */
-#define CVT_K_FACTOR 128
-
-/* Scaling factor weighting - default 20 */
-#define CVT_J_FACTOR 20
-
-#define CVT_M_PRIME CVT_M_FACTOR * CVT_K_FACTOR / 256
-#define CVT_C_PRIME (CVT_C_FACTOR - CVT_J_FACTOR) * CVT_K_FACTOR / 256 + \
- CVT_J_FACTOR
-
-/* Minimum vertical blanking interval time (µs) - default 460 */
-#define CVT_RB_MIN_VBLANK 460.0
-
-/* Fixed number of clocks for horizontal sync */
-#define CVT_RB_H_SYNC 32.0
-
-/* Fixed number of clocks for horizontal blanking */
-#define CVT_RB_H_BLANK 160.0
-
-/* Fixed number of lines for vertical front porch - default 3 */
-#define CVT_RB_VFPORCH 3
-
-/*
- * Generate a CVT standard mode from hdisplay, vdisplay and vrefresh.
- *
- * These calculations are stolen from the CVT calculation spreadsheet written
- * by Graham Loveridge. He seems to be claiming no copyright and there seems to
- * be no license attached to this. He apparently just wants to see his name
- * mentioned.
- *
- * This file can be found at http://www.vesa.org/Public/CVT/CVTd6r1.xls
- *
- * Comments and structure corresponds to the comments and structure of the xls.
- * This should ease importing of future changes to the standard (not very
- * likely though).
- *
- * This function is borrowed from xorg-xserver's xf86CVTmode.
- */
-void generate_cvt_mode(drmModeModeInfo *mode, int hdisplay, int vdisplay,
- float vrefresh, bool reduced, bool interlaced) {
- bool margins = false;
- float vfield_rate, hperiod;
- int hdisplay_rnd, hmargin;
- int vdisplay_rnd, vmargin, vsync;
- float interlace; /* Please rename this */
-
- /* CVT default is 60.0Hz */
- if (!vrefresh) {
- vrefresh = 60.0;
- }
-
- /* 1. Required field rate */
- if (interlaced) {
- vfield_rate = vrefresh * 2;
- } else {
- vfield_rate = vrefresh;
- }
-
- /* 2. Horizontal pixels */
- hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
-
- /* 3. Determine left and right borders */
- if (margins) {
- /* right margin is actually exactly the same as left */
- hmargin = (((float) hdisplay_rnd) * CVT_MARGIN_PERCENTAGE / 100.0);
- hmargin -= hmargin % CVT_H_GRANULARITY;
- } else {
- hmargin = 0;
- }
-
- /* 4. Find total active pixels */
- mode->hdisplay = hdisplay_rnd + 2 * hmargin;
-
- /* 5. Find number of lines per field */
- if (interlaced) {
- vdisplay_rnd = vdisplay / 2;
- } else {
- vdisplay_rnd = vdisplay;
- }
-
- /* 6. Find top and bottom margins */
- /* nope. */
- if (margins) {
- /* top and bottom margins are equal again. */
- vmargin = (((float) vdisplay_rnd) * CVT_MARGIN_PERCENTAGE / 100.0);
- } else {
- vmargin = 0;
- }
-
- mode->vdisplay = vdisplay + 2 * vmargin;
-
- /* 7. interlace */
- if (interlaced) {
- interlace = 0.5;
- } else {
- interlace = 0.0;
- }
-
- /* Determine vsync Width from aspect ratio */
- if (!(vdisplay % 3) && ((vdisplay * 4 / 3) == hdisplay)) {
- vsync = 4;
- } else if (!(vdisplay % 9) && ((vdisplay * 16 / 9) == hdisplay)) {
- vsync = 5;
- } else if (!(vdisplay % 10) && ((vdisplay * 16 / 10) == hdisplay)) {
- vsync = 6;
- } else if (!(vdisplay % 4) && ((vdisplay * 5 / 4) == hdisplay)) {
- vsync = 7;
- } else if (!(vdisplay % 9) && ((vdisplay * 15 / 9) == hdisplay)) {
- vsync = 7;
- } else { /* Custom */
- vsync = 10;
- }
-
- if (!reduced) { /* simplified GTF calculation */
- float hblank_percentage;
- int vsync_and_back_porch, vblank_porch;
- int hblank;
-
- /* 8. Estimated Horizontal period */
- hperiod = ((float) (1000000.0 / vfield_rate - CVT_MIN_VSYNC_BP)) /
- (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH + interlace);
-
- /* 9. Find number of lines in sync + backporch */
- if (((int) (CVT_MIN_VSYNC_BP / hperiod) + 1) <
- (vsync + CVT_MIN_V_PORCH)) {
- vsync_and_back_porch = vsync + CVT_MIN_V_PORCH;
- } else {
- vsync_and_back_porch = (int) (CVT_MIN_VSYNC_BP / hperiod) + 1;
- }
-
- /* 10. Find number of lines in back porch */
- vblank_porch = vsync_and_back_porch - vsync;
- (void) vblank_porch;
-
- /* 11. Find total number of lines in vertical field */
- mode->vtotal = vdisplay_rnd + 2 * vmargin + vsync_and_back_porch + interlace
- + CVT_MIN_V_PORCH;
-
- /* 12. Find ideal blanking duty cycle from formula */
- hblank_percentage = CVT_C_PRIME - CVT_M_PRIME * hperiod / 1000.0;
-
- /* 13. Blanking time */
- if (hblank_percentage < 20) {
- hblank_percentage = 20;
- }
-
- hblank = mode->hdisplay * hblank_percentage / (100.0 - hblank_percentage);
- hblank -= hblank % (2 * CVT_H_GRANULARITY);
-
- /* 14. Find total number of pixels in a line. */
- mode->htotal = mode->hdisplay + hblank;
-
- /* Fill in hsync values */
- mode->hsync_end = mode->hdisplay + hblank / 2;
-
- mode->hsync_start = mode->hsync_end -
- (mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
- mode->hsync_start += CVT_H_GRANULARITY -
- mode->hsync_start % CVT_H_GRANULARITY;
-
- /* Fill in vsync values */
- mode->vsync_start = mode->vdisplay + CVT_MIN_V_PORCH;
- mode->vsync_end = mode->vsync_start + vsync;
- } else { /* reduced blanking */
- int vbi_lines;
-
- /* 8. Estimate Horizontal period. */
- hperiod = ((float) (1000000.0 / vfield_rate - CVT_RB_MIN_VBLANK)) /
- (vdisplay_rnd + 2 * vmargin);
-
- /* 9. Find number of lines in vertical blanking */
- vbi_lines = ((float) CVT_RB_MIN_VBLANK) / hperiod + 1;
-
- /* 10. Check if vertical blanking is sufficient */
- if (vbi_lines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH)) {
- vbi_lines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
- }
-
- /* 11. Find total number of lines in vertical field */
- mode->vtotal = vdisplay_rnd + 2 * vmargin + interlace + vbi_lines;
-
- /* 12. Find total number of pixels in a line */
- mode->htotal = mode->hdisplay + CVT_RB_H_BLANK;
-
- /* Fill in hsync values */
- mode->hsync_end = mode->hdisplay + CVT_RB_H_BLANK / 2;
- mode->hsync_start = mode->hsync_end - CVT_RB_H_SYNC;
-
- /* Fill in vsync values */
- mode->vsync_start = mode->vdisplay + CVT_RB_VFPORCH;
- mode->vsync_end = mode->vsync_start + vsync;
- }
-
- /* 15/13. Find pixel clock frequency (kHz for xf86) */
- mode->clock = mode->htotal * 1000.0 / hperiod;
- mode->clock -= mode->clock % CVT_CLOCK_STEP;
-
- /* 17/15. Find actual Field rate */
- mode->vrefresh = (1000.0 * ((float) mode->clock)) /
- ((float) (mode->htotal * mode->vtotal));
-
- /* 18/16. Find actual vertical frame frequency */
- /* ignore - just set the mode flag for interlaced */
- if (interlaced) {
- mode->vtotal *= 2;
- mode->flags |= DRM_MODE_FLAG_INTERLACE;
- }
-
- snprintf(mode->name, sizeof(mode->name), "%dx%d", hdisplay, vdisplay);
-
- if (reduced) {
- mode->flags |= DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
- } else {
- mode->flags |= DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
- }
-}
diff --git a/backend/drm/drm.c b/backend/drm/drm.c
index 7eacb2f0..40360f17 100644
--- a/backend/drm/drm.c
+++ b/backend/drm/drm.c
@@ -21,7 +21,6 @@
#include <wlr/util/log.h>
#include <xf86drm.h>
#include <xf86drmMode.h>
-#include "backend/drm/cvt.h"
#include "backend/drm/drm.h"
#include "backend/drm/iface.h"
#include "backend/drm/util.h"
@@ -465,7 +464,7 @@ static void drm_connector_state_init(struct wlr_drm_connector_state *state,
case WLR_OUTPUT_STATE_MODE_CUSTOM:
generate_cvt_mode(&state->mode, base->custom_mode.width,
base->custom_mode.height,
- (float)base->custom_mode.refresh / 1000, false, false);
+ (float)base->custom_mode.refresh / 1000);
state->mode.type = DRM_MODE_TYPE_USERDEF;
break;
}
diff --git a/backend/drm/meson.build b/backend/drm/meson.build
index 824134fe..6fcb2c15 100644
--- a/backend/drm/meson.build
+++ b/backend/drm/meson.build
@@ -37,7 +37,6 @@ wlr_files += pnpids_c
wlr_files += files(
'atomic.c',
'backend.c',
- 'cvt.c',
'drm.c',
'legacy.c',
'monitor.c',
diff --git a/backend/drm/util.c b/backend/drm/util.c
index d4ece1f9..560127fa 100644
--- a/backend/drm/util.c
+++ b/backend/drm/util.c
@@ -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);
+}
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-28 19:18:13 +0000