aboutsummaryrefslogtreecommitdiffstats
path: root/drivers/gpu/drm/drm_modes.c
diff options
context:
space:
mode:
Diffstat (limited to 'drivers/gpu/drm/drm_modes.c')
-rw-r--r--drivers/gpu/drm/drm_modes.c435
1 files changed, 425 insertions, 10 deletions
diff --git a/drivers/gpu/drm/drm_modes.c b/drivers/gpu/drm/drm_modes.c
index 7914097..49404ce 100644
--- a/drivers/gpu/drm/drm_modes.c
+++ b/drivers/gpu/drm/drm_modes.c
@@ -8,6 +8,8 @@
* Copyright © 2007 Dave Airlie
* Copyright © 2007-2008 Intel Corporation
* Jesse Barnes <jesse.barnes@intel.com>
+ * 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"),
@@ -38,7 +40,6 @@
#include "drm.h"
#include "drm_crtc.h"
-#define DRM_MODESET_DEBUG "drm_mode"
/**
* drm_mode_debug_printmodeline - debug print a mode
* @dev: DRM device
@@ -51,8 +52,8 @@
*/
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,
@@ -62,6 +63,420 @@ void drm_mode_debug_printmodeline(struct drm_display_mode *mode)
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) /
+ 1000;
+ /* 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) *
+ 2 + 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) /
+ 1000;
+ 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
*
@@ -151,7 +566,9 @@ EXPORT_SYMBOL(drm_mode_height);
* 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)
{
@@ -161,14 +578,13 @@ int drm_mode_vrefresh(struct drm_display_mode *mode)
if (mode->vrefresh > 0)
refresh = mode->vrefresh;
else if (mode->htotal > 0 && mode->vtotal > 0) {
+ int vtotal;
+ vtotal = mode->vtotal;
/* work out vrefresh the value will be x1000 */
calc_val = (mode->clock * 1000);
-
calc_val /= mode->htotal;
- calc_val *= 1000;
- 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)
@@ -403,8 +819,7 @@ void drm_mode_prune_invalid(struct drm_device *dev,
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);