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

1 files changed, 0 insertions, 269 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;
-	}
-}