WebSVN – Kolibri OS – Diff – /drivers/video/drm/drm_modes.c

+ *
  * Copyright © 1997-2003 by The XFree86 Project, Inc.
  * Copyright © 2007 Dave Airlie
  * Copyright © 2007-2008 Intel Corporation
  *   Jesse Barnes
+ * Copyright 2005-2006 Luc Verhaegen
+ * Copyright (c) 2001, Andy Ritger  aritger@nvidia.com
+ *
  * 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 author(s) shall not be used in advertising or otherwise to promote
  * the sale, use or other dealings in this Software without prior written
  * authorization from the copyright holder(s) and author(s).
  */
 #include
 #include "drmP.h"
 #include "drm.h"
-#include "drm_crtc.h"
 #include "drm_crtc.h"
 #define DRM_MODESET_DEBUG	"drm_mode"
 /**
  * drm_mode_debug_printmodeline - debug print a mode
  * @dev: DRM device
+ *
  * Describe @mode using DRM_DEBUG.
  */
 void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
+{
-	DRM_DEBUG_MODE(DRM_MODESET_DEBUG,
-		"Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d 0x%x 0x%x\n",
+	DRM_DEBUG_KMS("Modeline %d:\"%s\" %d %d %d %d %d %d %d %d %d %d "
+			"0x%x 0x%x\n",
 		mode->base.id, mode->name, mode->vrefresh, mode->clock,
 		mode->hdisplay, mode->hsync_start,
 		mode->hsync_end, mode->htotal,
 		mode->vdisplay, mode->vsync_start,
 		mode->vsync_end, mode->vtotal, mode->type, mode->flags);
+}
 EXPORT_SYMBOL(drm_mode_debug_printmodeline);
+/**
+ * drm_cvt_mode -create a modeline based on CVT algorithm
+ * @dev: DRM device
+ * @hdisplay: hdisplay size
+ * @vdisplay: vdisplay size
+ * @vrefresh  : vrefresh rate
+ * @reduced : Whether the GTF calculation is simplified
+ * @interlaced:Whether the interlace is supported
+ *
+ * LOCKING:
+ * none.
+ *
+ * return the modeline based on CVT algorithm
+ *
+ * This function is called to generate the modeline based on CVT algorithm
+ * according to the hdisplay, vdisplay, vrefresh.
+ * It is based from the VESA(TM) Coordinated Video Timing Generator by
+ * Graham Loveridge April 9, 2003 available at
+ * http://www.vesa.org/public/CVT/CVTd6r1.xls
+ *
+ * And it is copied from xf86CVTmode in xserver/hw/xfree86/modes/xf86cvt.c.
+ * What I have done is to translate it by using integer calculation.
+ */
+#define HV_FACTOR			1000
+struct drm_display_mode *drm_cvt_mode(struct drm_device *dev, int hdisplay,
+				      int vdisplay, int vrefresh,
+				      bool reduced, bool interlaced)
+{
+	/* 1) top/bottom margin size (% of height) - default: 1.8, */
+#define	CVT_MARGIN_PERCENTAGE		18
+	/* 2) character cell horizontal granularity (pixels) - default 8 */
+#define	CVT_H_GRANULARITY		8
+	/* 3) Minimum vertical porch (lines) - default 3 */
+#define	CVT_MIN_V_PORCH			3
+	/* 4) Minimum number of vertical back porch lines - default 6 */
+#define	CVT_MIN_V_BPORCH		6
+	/* Pixel Clock step (kHz) */
+#define CVT_CLOCK_STEP			250
+	struct drm_display_mode *drm_mode;
+	bool margins = false;
+	unsigned int vfieldrate, hperiod;
+	int hdisplay_rnd, hmargin, vdisplay_rnd, vmargin, vsync;
+	int interlace;
+	/* allocate the drm_display_mode structure. If failure, we will
+	 * return directly
+	 */
+	drm_mode = drm_mode_create(dev);
+	if (!drm_mode)
+		return NULL;
+	/* the CVT default refresh rate is 60Hz */
+	if (!vrefresh)
+		vrefresh = 60;
+	/* the required field fresh rate */
+	if (interlaced)
+		vfieldrate = vrefresh * 2;
+	else
+		vfieldrate = vrefresh;
+	/* horizontal pixels */
+	hdisplay_rnd = hdisplay - (hdisplay % CVT_H_GRANULARITY);
+	/* determine the left&right borders */
+	hmargin = 0;
+	if (margins) {
+		hmargin = hdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
+		hmargin -= hmargin % CVT_H_GRANULARITY;
+	}
+	/* find the total active pixels */
+	drm_mode->hdisplay = hdisplay_rnd + 2 * hmargin;
+	/* find the number of lines per field */
+	if (interlaced)
+		vdisplay_rnd = vdisplay / 2;
+	else
+		vdisplay_rnd = vdisplay;
+	/* find the top & bottom borders */
+	vmargin = 0;
+	if (margins)
+		vmargin = vdisplay_rnd * CVT_MARGIN_PERCENTAGE / 1000;
+	drm_mode->vdisplay = vdisplay + 2 * vmargin;
+	/* Interlaced */
+	if (interlaced)
+		interlace = 1;
+	else
+		interlace = 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) {
+		/* simplify the GTF calculation */
+		/* 4) Minimum time of vertical sync + back porch interval (µs)
+		 * default 550.0
+		 */
+		int tmp1, tmp2;
+#define CVT_MIN_VSYNC_BP	550
+		/* 3) Nominal HSync width (% of line period) - default 8 */
+#define CVT_HSYNC_PERCENTAGE	8
+		unsigned int hblank_percentage;
+		int vsyncandback_porch, vback_porch, hblank;
+		/* estimated the horizontal period */
+		tmp1 = HV_FACTOR * 1000000  -
+				CVT_MIN_VSYNC_BP * HV_FACTOR * vfieldrate;
+		tmp2 = (vdisplay_rnd + 2 * vmargin + CVT_MIN_V_PORCH) * 2 +
+				interlace;
+		hperiod = tmp1 * 2 / (tmp2 * vfieldrate);
+		tmp1 = CVT_MIN_VSYNC_BP * HV_FACTOR / hperiod + 1;
+		/* 9. Find number of lines in sync + backporch */
+		if (tmp1 < (vsync + CVT_MIN_V_PORCH))
+			vsyncandback_porch = vsync + CVT_MIN_V_PORCH;
+		else
+			vsyncandback_porch = tmp1;
+		/* 10. Find number of lines in back porch */
+		vback_porch = vsyncandback_porch - vsync;
+		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin +
+				vsyncandback_porch + CVT_MIN_V_PORCH;
+		/* 5) 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)
+		/* 12. Find ideal blanking duty cycle from formula */
+		hblank_percentage = CVT_C_PRIME * HV_FACTOR - CVT_M_PRIME *
+					hperiod / 1000;
+		/* 13. Blanking time */
+		if (hblank_percentage < 20 * HV_FACTOR)
+			hblank_percentage = 20 * HV_FACTOR;
+		hblank = drm_mode->hdisplay * hblank_percentage /
+			 (100 * HV_FACTOR - hblank_percentage);
+		hblank -= hblank % (2 * CVT_H_GRANULARITY);
+		/* 14. find the total pixes per line */
+		drm_mode->htotal = drm_mode->hdisplay + hblank;
+		drm_mode->hsync_end = drm_mode->hdisplay + hblank / 2;
+		drm_mode->hsync_start = drm_mode->hsync_end -
+			(drm_mode->htotal * CVT_HSYNC_PERCENTAGE) / 100;
+		drm_mode->hsync_start += CVT_H_GRANULARITY -
+			drm_mode->hsync_start % CVT_H_GRANULARITY;
+		/* fill the Vsync values */
+		drm_mode->vsync_start = drm_mode->vdisplay + CVT_MIN_V_PORCH;
+		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
+	} else {
+		/* Reduced blanking */
+		/* Minimum vertical blanking interval time (µs)- default 460 */
+#define CVT_RB_MIN_VBLANK	460
+		/* Fixed number of clocks for horizontal sync */
+#define CVT_RB_H_SYNC		32
+		/* Fixed number of clocks for horizontal blanking */
+#define CVT_RB_H_BLANK		160
+		/* Fixed number of lines for vertical front porch - default 3*/
+#define CVT_RB_VFPORCH		3
+		int vbilines;
+		int tmp1, tmp2;
+		/* 8. Estimate Horizontal period. */
+		tmp1 = HV_FACTOR * 1000000 -
+			CVT_RB_MIN_VBLANK * HV_FACTOR * vfieldrate;
+		tmp2 = vdisplay_rnd + 2 * vmargin;
+		hperiod = tmp1 / (tmp2 * vfieldrate);
+		/* 9. Find number of lines in vertical blanking */
+		vbilines = CVT_RB_MIN_VBLANK * HV_FACTOR / hperiod + 1;
+		/* 10. Check if vertical blanking is sufficient */
+		if (vbilines < (CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH))
+			vbilines = CVT_RB_VFPORCH + vsync + CVT_MIN_V_BPORCH;
+		/* 11. Find total number of lines in vertical field */
+		drm_mode->vtotal = vdisplay_rnd + 2 * vmargin + vbilines;
+		/* 12. Find total number of pixels in a line */
+		drm_mode->htotal = drm_mode->hdisplay + CVT_RB_H_BLANK;
+		/* Fill in HSync values */
+		drm_mode->hsync_end = drm_mode->hdisplay + CVT_RB_H_BLANK / 2;
+		drm_mode->hsync_start = drm_mode->hsync_end = CVT_RB_H_SYNC;
+	}
+	/* 15/13. Find pixel clock frequency (kHz for xf86) */
+	drm_mode->clock = drm_mode->htotal * HV_FACTOR * 1000 / hperiod;
+	drm_mode->clock -= drm_mode->clock % CVT_CLOCK_STEP;
+	/* 18/16. Find actual vertical frame frequency */
+	/* ignore - just set the mode flag for interlaced */
+	if (interlaced)
+		drm_mode->vtotal *= 2;
+	/* Fill the mode line name */
+	drm_mode_set_name(drm_mode);
+	if (reduced)
+		drm_mode->flags |= (DRM_MODE_FLAG_PHSYNC |
+					DRM_MODE_FLAG_NVSYNC);
+	else
+		drm_mode->flags |= (DRM_MODE_FLAG_PVSYNC |
+					DRM_MODE_FLAG_NHSYNC);
+	if (interlaced)
+		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+    return drm_mode;
+}
+EXPORT_SYMBOL(drm_cvt_mode);
+/**
+ * drm_gtf_mode - create the modeline based on GTF algorithm
+ *
+ * @dev		:drm device
+ * @hdisplay	:hdisplay size
+ * @vdisplay	:vdisplay size
+ * @vrefresh	:vrefresh rate.
+ * @interlaced	:whether the interlace is supported
+ * @margins	:whether the margin is supported
+ *
+ * LOCKING.
+ * none.
+ *
+ * return the modeline based on GTF algorithm
+ *
+ * This function is to create the modeline based on the GTF algorithm.
+ * Generalized Timing Formula is derived from:
+ *	GTF Spreadsheet by Andy Morrish (1/5/97)
+ *	available at http://www.vesa.org
+ *
+ * And it is copied from the file of xserver/hw/xfree86/modes/xf86gtf.c.
+ * What I have done is to translate it by using integer calculation.
+ * I also refer to the function of fb_get_mode in the file of
+ * drivers/video/fbmon.c
+ */
+struct drm_display_mode *drm_gtf_mode(struct drm_device *dev, int hdisplay,
+				      int vdisplay, int vrefresh,
+				      bool interlaced, int margins)
+{
+	/* 1) top/bottom margin size (% of height) - default: 1.8, */
+#define	GTF_MARGIN_PERCENTAGE		18
+	/* 2) character cell horizontal granularity (pixels) - default 8 */
+#define	GTF_CELL_GRAN			8
+	/* 3) Minimum vertical porch (lines) - default 3 */
+#define	GTF_MIN_V_PORCH			1
+	/* width of vsync in lines */
+#define V_SYNC_RQD			3
+	/* width of hsync as % of total line */
+#define H_SYNC_PERCENT			8
+	/* min time of vsync + back porch (microsec) */
+#define MIN_VSYNC_PLUS_BP		550
+	/* blanking formula gradient */
+#define GTF_M				600
+	/* blanking formula offset */
+#define GTF_C				40
+	/* blanking formula scaling factor */
+#define GTF_K				128
+	/* blanking formula scaling factor */
+#define GTF_J				20
+	/* C' and M' are part of the Blanking Duty Cycle computation */
+#define GTF_C_PRIME		(((GTF_C - GTF_J) * GTF_K / 256) + GTF_J)
+#define GTF_M_PRIME		(GTF_K * GTF_M / 256)
+	struct drm_display_mode *drm_mode;
+	unsigned int hdisplay_rnd, vdisplay_rnd, vfieldrate_rqd;
+	int top_margin, bottom_margin;
+	int interlace;
+	unsigned int hfreq_est;
+	int vsync_plus_bp, vback_porch;
+	unsigned int vtotal_lines, vfieldrate_est, hperiod;
+	unsigned int vfield_rate, vframe_rate;
+	int left_margin, right_margin;
+	unsigned int total_active_pixels, ideal_duty_cycle;
+	unsigned int hblank, total_pixels, pixel_freq;
+	int hsync, hfront_porch, vodd_front_porch_lines;
+	unsigned int tmp1, tmp2;
+	drm_mode = drm_mode_create(dev);
+	if (!drm_mode)
+		return NULL;
+	/* 1. In order to give correct results, the number of horizontal
+	 * pixels requested is first processed to ensure that it is divisible
+	 * by the character size, by rounding it to the nearest character
+	 * cell boundary:
+	 */
+	hdisplay_rnd = (hdisplay + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
+	hdisplay_rnd = hdisplay_rnd * GTF_CELL_GRAN;
+	/* 2. If interlace is requested, the number of vertical lines assumed
+	 * by the calculation must be halved, as the computation calculates
+	 * the number of vertical lines per field.
+	 */
+	if (interlaced)
+		vdisplay_rnd = vdisplay / 2;
+	else
+		vdisplay_rnd = vdisplay;
+	/* 3. Find the frame rate required: */
+	if (interlaced)
+		vfieldrate_rqd = vrefresh * 2;
+	else
+		vfieldrate_rqd = vrefresh;
+	/* 4. Find number of lines in Top margin: */
+	top_margin = 0;
+	if (margins)
+		top_margin = (vdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
+;
+	/* 5. Find number of lines in bottom margin: */
+	bottom_margin = top_margin;
+	/* 6. If interlace is required, then set variable interlace: */
+	if (interlaced)
+		interlace = 1;
+	else
+		interlace = 0;
+	/* 7. Estimate the Horizontal frequency */
+	{
+		tmp1 = (1000000  - MIN_VSYNC_PLUS_BP * vfieldrate_rqd) / 500;
+		tmp2 = (vdisplay_rnd + 2 * top_margin + GTF_MIN_V_PORCH) *
++ interlace;
+		hfreq_est = (tmp2 * 1000 * vfieldrate_rqd) / tmp1;
+	}
+	/* 8. Find the number of lines in V sync + back porch */
+	/* [V SYNC+BP] = RINT(([MIN VSYNC+BP] * hfreq_est / 1000000)) */
+	vsync_plus_bp = MIN_VSYNC_PLUS_BP * hfreq_est / 1000;
+	vsync_plus_bp = (vsync_plus_bp + 500) / 1000;
+	/*  9. Find the number of lines in V back porch alone: */
+	vback_porch = vsync_plus_bp - V_SYNC_RQD;
+	/*  10. Find the total number of lines in Vertical field period: */
+	vtotal_lines = vdisplay_rnd + top_margin + bottom_margin +
+			vsync_plus_bp + GTF_MIN_V_PORCH;
+	/*  11. Estimate the Vertical field frequency: */
+	vfieldrate_est = hfreq_est / vtotal_lines;
+	/*  12. Find the actual horizontal period: */
+	hperiod = 1000000 / (vfieldrate_rqd * vtotal_lines);
+	/*  13. Find the actual Vertical field frequency: */
+	vfield_rate = hfreq_est / vtotal_lines;
+	/*  14. Find the Vertical frame frequency: */
+	if (interlaced)
+		vframe_rate = vfield_rate / 2;
+	else
+		vframe_rate = vfield_rate;
+	/*  15. Find number of pixels in left margin: */
+	if (margins)
+		left_margin = (hdisplay_rnd * GTF_MARGIN_PERCENTAGE + 500) /
+;
+	else
+		left_margin = 0;
+	/* 16.Find number of pixels in right margin: */
+	right_margin = left_margin;
+	/* 17.Find total number of active pixels in image and left and right */
+	total_active_pixels = hdisplay_rnd + left_margin + right_margin;
+	/* 18.Find the ideal blanking duty cycle from blanking duty cycle */
+	ideal_duty_cycle = GTF_C_PRIME * 1000 -
+				(GTF_M_PRIME * 1000000 / hfreq_est);
+	/* 19.Find the number of pixels in the blanking time to the nearest
+	 * double character cell: */
+	hblank = total_active_pixels * ideal_duty_cycle /
+			(100000 - ideal_duty_cycle);
+	hblank = (hblank + GTF_CELL_GRAN) / (2 * GTF_CELL_GRAN);
+	hblank = hblank * 2 * GTF_CELL_GRAN;
+	/* 20.Find total number of pixels: */
+	total_pixels = total_active_pixels + hblank;
+	/* 21.Find pixel clock frequency: */
+	pixel_freq = total_pixels * hfreq_est / 1000;
+	/* Stage 1 computations are now complete; I should really pass
+	 * the results to another function and do the Stage 2 computations,
+	 * but I only need a few more values so I'll just append the
+	 * computations here for now */
+	/* 17. Find the number of pixels in the horizontal sync period: */
+	hsync = H_SYNC_PERCENT * total_pixels / 100;
+	hsync = (hsync + GTF_CELL_GRAN / 2) / GTF_CELL_GRAN;
+	hsync = hsync * GTF_CELL_GRAN;
+	/* 18. Find the number of pixels in horizontal front porch period */
+	hfront_porch = hblank / 2 - hsync;
+	/*  36. Find the number of lines in the odd front porch period: */
+	vodd_front_porch_lines = GTF_MIN_V_PORCH ;
+	/* finally, pack the results in the mode struct */
+	drm_mode->hdisplay = hdisplay_rnd;
+	drm_mode->hsync_start = hdisplay_rnd + hfront_porch;
+	drm_mode->hsync_end = drm_mode->hsync_start + hsync;
+	drm_mode->htotal = total_pixels;
+	drm_mode->vdisplay = vdisplay_rnd;
+	drm_mode->vsync_start = vdisplay_rnd + vodd_front_porch_lines;
+	drm_mode->vsync_end = drm_mode->vsync_start + V_SYNC_RQD;
+	drm_mode->vtotal = vtotal_lines;
+	drm_mode->clock = pixel_freq;
+	drm_mode_set_name(drm_mode);
+	drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
+	if (interlaced) {
+		drm_mode->vtotal *= 2;
+		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+	}
+	return drm_mode;
+}
+EXPORT_SYMBOL(drm_gtf_mode);
 /**
  * drm_mode_set_name - set the name on a mode
  * @mode: name will be set in this mode
+ *
  * LOCKING:
  * Return @mode's vrefresh rate or calculate it if necessary.
+ *
  * FIXME: why is this needed?  shouldn't vrefresh be set already?
+ *
  * RETURNS:
- * Vertical refresh rate of @mode x 1000. For precision reasons.
+ * Vertical refresh rate. It will be the result of actual value plus 0.5.
+ * If it is 70.288, it will return 70Hz.
+ * If it is 59.6, it will return 60Hz.
  */
 int drm_mode_vrefresh(struct drm_display_mode *mode)
+{
 	int refresh = 0;
 	unsigned int calc_val;
 	if (mode->vrefresh > 0)
 		refresh = mode->vrefresh;
+	else if (mode->htotal > 0 && mode->vtotal > 0) {
+		int vtotal;
-	else if (mode->htotal > 0 && mode->vtotal > 0) {
+		vtotal = mode->vtotal;
 		/* work out vrefresh the value will be x1000 */
-		calc_val = (mode->clock * 1000);
 		calc_val = (mode->clock * 1000);
-		calc_val /= mode->htotal;
-		calc_val *= 1000;
+		calc_val /= mode->htotal;
-		calc_val /= mode->vtotal;
 		refresh = (calc_val + vtotal / 2) / vtotal;
 		refresh = calc_val;
 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 			refresh *= 2;
 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 	list_for_each_entry_safe(mode, t, mode_list, head) {
 		if (mode->status != MODE_OK) {
 			list_del(&mode->head);
 			if (verbose) {
 				drm_mode_debug_printmodeline(mode);
-				DRM_DEBUG_MODE(DRM_MODESET_DEBUG,
-					"Not using %s mode %d\n",
+				DRM_DEBUG_KMS("Not using %s mode %d\n",
 					mode->name, mode->status);
+			}
 			drm_mode_destroy(dev, mode);
+		}
+	}
 		list_for_each_entry(mode, &connector->modes, head) {
 			if (drm_mode_equal(pmode, mode)) {
 				found_it = 1;
 				/* if equal delete the probed mode */
 				mode->status = pmode->status;
+				/* Merge type bits together */
+				mode->type |= pmode->type;
 				list_del(&pmode->head);
 				drm_mode_destroy(connector->dev, pmode);
 				break;
+			}
+		}

Subversion Repositories Kolibri OS

(root)/drivers/video/drm/drm_modes.c – Rev 1123 → 1179