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/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.
+ *
  * Except as contained in this notice, the name of the copyright holder(s)
  * 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
 #include
 #include
 #include
+#include
+#include "drm_crtc_internal.h"
 /**
- * drm_mode_debug_printmodeline - debug print a mode
- * @dev: DRM device
+ * drm_mode_debug_printmodeline - print a mode to dmesg
  * @mode: mode to print
- *
- * LOCKING:
- * None.
+ *
  * Describe @mode using DRM_DEBUG.
  */
 void drm_mode_debug_printmodeline(const struct drm_display_mode *mode)
+{
 	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
+ * drm_mode_create - create a new display mode
  * @dev: DRM device
+ *
+ * Create a new, cleared drm_display_mode with kzalloc, allocate an ID for it
+ * and return it.
+ *
+ * Returns:
+ * Pointer to new mode on success, NULL on error.
+ */
+struct drm_display_mode *drm_mode_create(struct drm_device *dev)
+{
+	struct drm_display_mode *nmode;
+	nmode = kzalloc(sizeof(struct drm_display_mode), GFP_KERNEL);
+	if (!nmode)
+		return NULL;
+	if (drm_mode_object_get(dev, &nmode->base, DRM_MODE_OBJECT_MODE)) {
+		kfree(nmode);
+		return NULL;
+	}
+	return nmode;
+}
+EXPORT_SYMBOL(drm_mode_create);
+/**
+ * drm_mode_destroy - remove a mode
+ * @dev: DRM device
+ * @mode: mode to remove
+ *
+ * Release @mode's unique ID, then free it @mode structure itself using kfree.
+ */
+void drm_mode_destroy(struct drm_device *dev, struct drm_display_mode *mode)
+{
+	if (!mode)
+		return;
+	drm_mode_object_put(dev, &mode->base);
+	kfree(mode);
+}
+EXPORT_SYMBOL(drm_mode_destroy);
+/**
+ * drm_mode_probed_add - add a mode to a connector's probed_mode list
+ * @connector: connector the new mode
+ * @mode: mode data
+ *
+ * Add @mode to @connector's probed_mode list for later use. This list should
+ * then in a second step get filtered and all the modes actually supported by
+ * the hardware moved to the @connector's modes list.
+ */
+void drm_mode_probed_add(struct drm_connector *connector,
+			 struct drm_display_mode *mode)
+{
+	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
+	list_add_tail(&mode->head, &connector->probed_modes);
+}
+EXPORT_SYMBOL(drm_mode_probed_add);
+/**
+ * drm_cvt_mode -create a modeline based on the CVT algorithm
+ * @dev: drm device
  * @hdisplay: hdisplay size
  * @vdisplay: vdisplay size
- * @vrefresh  : vrefresh rate
+ * @vrefresh: vrefresh rate
- * @reduced : Whether the GTF calculation is simplified
+ * @reduced: whether to use reduced blanking
- * @interlaced:Whether the interlace is supported
+ * @interlaced: whether to compute an interlaced mode
- *
- * LOCKING:
- * none.
- *
- * return the modeline based on CVT algorithm
+ * @margins: whether to add margins (borders)
+ *
  * 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.elo.utfsm.cl/~elo212/docs/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.
+ *
+ * Returns:
+ * The modeline based on the CVT algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
  */
-#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, bool margins)
+{
+#define HV_FACTOR			1000
 	/* 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;
 	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;
 		/* Fill in VSync values */
 		drm_mode->vsync_start = drm_mode->vdisplay + CVT_RB_VFPORCH;
 		drm_mode->vsync_end = drm_mode->vsync_start + vsync;
+	}
 	/* 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;
 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+	}
 	/* 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);
     return drm_mode;
+}
 EXPORT_SYMBOL(drm_cvt_mode);
 /**
- * drm_gtf_mode_complex - create the modeline based on full GTF algorithm
+ * drm_gtf_mode_complex - create the modeline based on the full GTF algorithm
- *
- * @dev		:drm device
+ * @dev: drm device
- * @hdisplay	:hdisplay size
+ * @hdisplay: hdisplay size
- * @vdisplay	:vdisplay size
+ * @vdisplay: vdisplay size
- * @vrefresh	:vrefresh rate.
+ * @vrefresh: vrefresh rate.
- * @interlaced	:whether the interlace is supported
+ * @interlaced: whether to compute an interlaced mode
- * @margins	:desired margin size
+ * @margins: desired margin (borders) size
- * @GTF_[MCKJ]  :extended GTF formula parameters
+ * @GTF_M: extended GTF formula parameters
- *
- * LOCKING.
+ * @GTF_2C: extended GTF formula parameters
- * none.
+ * @GTF_K: extended GTF formula parameters
- *
- * return the modeline based on full GTF algorithm.
+ * @GTF_2J: extended GTF formula parameters
+ *
  * GTF feature blocks specify C and J in multiples of 0.5, so we pass them
  * in here multiplied by two.  For a C of 40, pass in 80.
+ *
+ * Returns:
+ * The modeline based on the full GTF algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
  */
 struct drm_display_mode *
 drm_gtf_mode_complex(struct drm_device *dev, int hdisplay, int vdisplay,
 		     int vrefresh, bool interlaced, int margins,
 		     int GTF_M, int GTF_2C, int GTF_K, int GTF_2J)
 {	/* 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
 	/* C' and M' are part of the Blanking Duty Cycle computation */
 #define GTF_C_PRIME	((((GTF_2C - GTF_2J) * GTF_K / 256) + GTF_2J) / 2)
 #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;
 	if (interlaced) {
 		drm_mode->vtotal *= 2;
 		drm_mode->flags |= DRM_MODE_FLAG_INTERLACE;
+	}
 	drm_mode_set_name(drm_mode);
 	if (GTF_M == 600 && GTF_2C == 80 && GTF_K == 128 && GTF_2J == 40)
 		drm_mode->flags = DRM_MODE_FLAG_NHSYNC | DRM_MODE_FLAG_PVSYNC;
 	else
 		drm_mode->flags = DRM_MODE_FLAG_PHSYNC | DRM_MODE_FLAG_NVSYNC;
 	return drm_mode;
+}
 EXPORT_SYMBOL(drm_gtf_mode_complex);
 /**
- * drm_gtf_mode - create the modeline based on GTF algorithm
+ * drm_gtf_mode - create the modeline based on the GTF algorithm
- *
- * @dev		:drm device
+ * @dev: drm device
- * @hdisplay	:hdisplay size
+ * @hdisplay: hdisplay size
- * @vdisplay	:vdisplay size
+ * @vdisplay: vdisplay size
- * @vrefresh	:vrefresh rate.
+ * @vrefresh: vrefresh rate.
- * @interlaced	:whether the interlace is supported
+ * @interlaced: whether to compute an interlaced mode
- * @margins	:whether the margin is supported
+ * @margins: desired margin (borders) size
- *
- * 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
+ *
  * Standard GTF parameters:
  * M = 600
  * C = 40
  * K = 128
  * J = 20
+ *
+ * Returns:
+ * The modeline based on the GTF algorithm stored in a drm_display_mode object.
+ * The display mode object is allocated with drm_mode_create(). Returns NULL
+ * when no mode could be allocated.
  */
 struct drm_display_mode *
 drm_gtf_mode(struct drm_device *dev, int hdisplay, int vdisplay, int vrefresh,
-	     bool lace, int margins)
+	     bool interlaced, int margins)
+{
-	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh, lace,
+	return drm_gtf_mode_complex(dev, hdisplay, vdisplay, vrefresh,
+				    interlaced, margins,
-				    margins, 600, 40 * 2, 128, 20 * 2);
+, 40 * 2, 128, 20 * 2);
+}
 EXPORT_SYMBOL(drm_gtf_mode);
 #ifdef CONFIG_VIDEOMODE_HELPERS
+/**
+ * drm_display_mode_from_videomode - fill in @dmode using @vm,
+ * @vm: videomode structure to use as source
+ * @dmode: drm_display_mode structure to use as destination
+ *
+ * Fills out @dmode using the display mode specified in @vm.
+ */
-int drm_display_mode_from_videomode(const struct videomode *vm,
+void drm_display_mode_from_videomode(const struct videomode *vm,
 				    struct drm_display_mode *dmode)
+{
 	dmode->hdisplay = vm->hactive;
 	dmode->hsync_start = dmode->hdisplay + vm->hfront_porch;
 	dmode->hsync_end = dmode->hsync_start + vm->hsync_len;
 	dmode->htotal = dmode->hsync_end + vm->hback_porch;
 	dmode->vdisplay = vm->vactive;
 	dmode->vsync_start = dmode->vdisplay + vm->vfront_porch;
 	dmode->vsync_end = dmode->vsync_start + vm->vsync_len;
 	dmode->vtotal = dmode->vsync_end + vm->vback_porch;
 	dmode->clock = vm->pixelclock / 1000;
 	dmode->flags = 0;
 	if (vm->flags & DISPLAY_FLAGS_HSYNC_HIGH)
 		dmode->flags |= DRM_MODE_FLAG_PHSYNC;
 	else if (vm->flags & DISPLAY_FLAGS_HSYNC_LOW)
 		dmode->flags |= DRM_MODE_FLAG_NHSYNC;
 	if (vm->flags & DISPLAY_FLAGS_VSYNC_HIGH)
 		dmode->flags |= DRM_MODE_FLAG_PVSYNC;
 	else if (vm->flags & DISPLAY_FLAGS_VSYNC_LOW)
 		dmode->flags |= DRM_MODE_FLAG_NVSYNC;
 	if (vm->flags & DISPLAY_FLAGS_INTERLACED)
 		dmode->flags |= DRM_MODE_FLAG_INTERLACE;
 	if (vm->flags & DISPLAY_FLAGS_DOUBLESCAN)
 		dmode->flags |= DRM_MODE_FLAG_DBLSCAN;
 	if (vm->flags & DISPLAY_FLAGS_DOUBLECLK)
 		dmode->flags |= DRM_MODE_FLAG_DBLCLK;
 	drm_mode_set_name(dmode);
-	return 0;
+}
 EXPORT_SYMBOL_GPL(drm_display_mode_from_videomode);
 #ifdef CONFIG_OF
 /**
  * of_get_drm_display_mode - get a drm_display_mode from devicetree
  * @np: device_node with the timing specification
  * @dmode: will be set to the return value
  * @index: index into the list of display timings in devicetree
+ *
  * This function is expensive and should only be used, if only one mode is to be
  * read from DT. To get multiple modes start with of_get_display_timings and
  * work with that instead.
+ *
+ * Returns:
+ * 0 on success, a negative errno code when no of videomode node was found.
  */
 int of_get_drm_display_mode(struct device_node *np,
 			    struct drm_display_mode *dmode, int index)
+{
 	struct videomode vm;
 	int ret;
 	ret = of_get_videomode(np, &vm, index);
 	if (ret)
 		return ret;
 	drm_display_mode_from_videomode(&vm, dmode);
 	pr_debug("%s: got %dx%d display mode from %s\n",
 		of_node_full_name(np), vm.hactive, vm.vactive, np->name);
 	drm_mode_debug_printmodeline(dmode);
 	return 0;
+}
 EXPORT_SYMBOL_GPL(of_get_drm_display_mode);
 #endif /* CONFIG_OF */
 #endif /* CONFIG_VIDEOMODE_HELPERS */
 /**
  * drm_mode_set_name - set the name on a mode
  * @mode: name will be set in this mode
+ *
- * LOCKING:
- * None.
- *
- * Set the name of @mode to a standard format.
+ * Set the name of @mode to a standard format which is x
+ * with an optional 'i' suffix for interlaced modes.
  */
 void drm_mode_set_name(struct drm_display_mode *mode)
+{
 	bool interlaced = !!(mode->flags & DRM_MODE_FLAG_INTERLACE);
 	snprintf(mode->name, DRM_DISPLAY_MODE_LEN, "%dx%d%s",
 		 mode->hdisplay, mode->vdisplay,
 		 interlaced ? "i" : "");
+}
 EXPORT_SYMBOL(drm_mode_set_name);
-/**
- * drm_mode_width - get the width of a mode
- * @mode: mode
- *
- * LOCKING:
- * None.
- *
- * Return @mode's width (hdisplay) value.
- *
- * FIXME: is this needed?
- *
- * RETURNS:
- * @mode->hdisplay
- */
-int drm_mode_width(const struct drm_display_mode *mode)
-{
-	return mode->hdisplay;
-}
-EXPORT_SYMBOL(drm_mode_width);
-/**
- * drm_mode_height - get the height of a mode
- * @mode: mode
- *
- * LOCKING:
- * None.
- *
- * Return @mode's height (vdisplay) value.
- *
- * FIXME: is this needed?
- *
- * RETURNS:
- * @mode->vdisplay
- */
-int drm_mode_height(const struct drm_display_mode *mode)
-{
-	return mode->vdisplay;
-}
-EXPORT_SYMBOL(drm_mode_height);
 /** drm_mode_hsync - get the hsync of a mode
  * @mode: mode
+ *
- * LOCKING:
+ * Returns:
- * None.
- *
- * Return @modes's hsync rate in kHz, rounded to the nearest int.
+ * @modes's hsync rate in kHz, rounded to the nearest integer. Calculates the
+ * value first if it is not yet set.
  */
 int drm_mode_hsync(const struct drm_display_mode *mode)
+{
 	unsigned int calc_val;
 	if (mode->hsync)
 		return mode->hsync;
 	if (mode->htotal < 0)
 		return 0;
 	calc_val = (mode->clock * 1000) / mode->htotal; /* hsync in Hz */
 	calc_val += 500;				/* round to 1000Hz */
 	calc_val /= 1000;				/* truncate to kHz */
 	return calc_val;
+}
 EXPORT_SYMBOL(drm_mode_hsync);
 /**
  * drm_mode_vrefresh - get the vrefresh of a mode
  * @mode: mode
+ *
- * LOCKING:
- * None.
- *
- * Return @mode's vrefresh rate in Hz or calculate it if necessary.
- *
- * FIXME: why is this needed?  shouldn't vrefresh be set already?
- *
- * RETURNS:
+ * Returns:
- * Vertical refresh rate. It will be the result of actual value plus 0.5.
+ * @modes's vrefresh rate in Hz, rounded to the nearest integer. Calculates the
- * If it is 70.288, it will return 70Hz.
- * If it is 59.6, it will return 60Hz.
+ * value first if it is not yet set.
  */
 int drm_mode_vrefresh(const 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;
 		vtotal = mode->vtotal;
 		/* work out vrefresh the value will be x1000 */
 		calc_val = (mode->clock * 1000);
 		calc_val /= mode->htotal;
 		refresh = (calc_val + vtotal / 2) / vtotal;
 		if (mode->flags & DRM_MODE_FLAG_INTERLACE)
 			refresh *= 2;
 		if (mode->flags & DRM_MODE_FLAG_DBLSCAN)
 			refresh /= 2;
 		if (mode->vscan > 1)
 			refresh /= mode->vscan;
+	}
 	return refresh;
+}
 EXPORT_SYMBOL(drm_mode_vrefresh);
 /**
- * drm_mode_set_crtcinfo - set CRTC modesetting parameters
+ * drm_mode_set_crtcinfo - set CRTC modesetting timing parameters
  * @p: mode
  * @adjust_flags: a combination of adjustment flags
+ *
- * LOCKING:
- * None.
- *
- * Setup the CRTC modesetting parameters for @p, adjusting if necessary.
+ * Setup the CRTC modesetting timing parameters for @p, adjusting if necessary.
+ *
  * - The CRTC_INTERLACE_HALVE_V flag can be used to halve vertical timings of
  *   interlaced modes.
  * - The CRTC_STEREO_DOUBLE flag can be used to compute the timings for
  *   buffers containing two eyes (only adjust the timings when needed, eg. for
  *   "frame packing" or "side by side full").
  */
 void drm_mode_set_crtcinfo(struct drm_display_mode *p, int adjust_flags)
+{
 	if ((p == NULL) || ((p->type & DRM_MODE_TYPE_CRTC_C) == DRM_MODE_TYPE_BUILTIN))
 		return;
 	p->crtc_clock = p->clock;
 	p->crtc_hdisplay = p->hdisplay;
 	p->crtc_hsync_start = p->hsync_start;
 	p->crtc_hsync_end = p->hsync_end;
 	p->crtc_htotal = p->htotal;
 	p->crtc_hskew = p->hskew;
 	p->crtc_vdisplay = p->vdisplay;
 	p->crtc_vsync_start = p->vsync_start;
 	p->crtc_vsync_end = p->vsync_end;
 	p->crtc_vtotal = p->vtotal;
 	if (p->flags & DRM_MODE_FLAG_INTERLACE) {
 		if (adjust_flags & CRTC_INTERLACE_HALVE_V) {
 			p->crtc_vdisplay /= 2;
 			p->crtc_vsync_start /= 2;
 			p->crtc_vsync_end /= 2;
 			p->crtc_vtotal /= 2;
+		}
+	}
 	if (p->flags & DRM_MODE_FLAG_DBLSCAN) {
 		p->crtc_vdisplay *= 2;
 		p->crtc_vsync_start *= 2;
 		p->crtc_vsync_end *= 2;
 		p->crtc_vtotal *= 2;
+	}
 	if (p->vscan > 1) {
 		p->crtc_vdisplay *= p->vscan;
 		p->crtc_vsync_start *= p->vscan;
 		p->crtc_vsync_end *= p->vscan;
 		p->crtc_vtotal *= p->vscan;
+	}
 	if (adjust_flags & CRTC_STEREO_DOUBLE) {
 		unsigned int layout = p->flags & DRM_MODE_FLAG_3D_MASK;
 		switch (layout) {
 		case DRM_MODE_FLAG_3D_FRAME_PACKING:
 			p->crtc_clock *= 2;
 			p->crtc_vdisplay += p->crtc_vtotal;
 			p->crtc_vsync_start += p->crtc_vtotal;
 			p->crtc_vsync_end += p->crtc_vtotal;
 			p->crtc_vtotal += p->crtc_vtotal;
 			break;
+		}
+	}
 	p->crtc_vblank_start = min(p->crtc_vsync_start, p->crtc_vdisplay);
 	p->crtc_vblank_end = max(p->crtc_vsync_end, p->crtc_vtotal);
 	p->crtc_hblank_start = min(p->crtc_hsync_start, p->crtc_hdisplay);
 	p->crtc_hblank_end = max(p->crtc_hsync_end, p->crtc_htotal);
+}
 EXPORT_SYMBOL(drm_mode_set_crtcinfo);
 /**
  * drm_mode_copy - copy the mode
  * @dst: mode to overwrite
  * @src: mode to copy
+ *
- * LOCKING:
- * None.
- *
  * Copy an existing mode into another mode, preserving the object id and
  * list head of the destination mode.
  */
 void drm_mode_copy(struct drm_display_mode *dst, const struct drm_display_mode *src)
+{
 	int id = dst->base.id;
 	struct list_head head = dst->head;
 	*dst = *src;
 	dst->base.id = id;
 	dst->head = head;
+}
 EXPORT_SYMBOL(drm_mode_copy);
 /**
  * drm_mode_duplicate - allocate and duplicate an existing mode
+ * @dev: drm_device to allocate the duplicated mode for
- * @m: mode to duplicate
+ * @mode: mode to duplicate
- *
- * LOCKING:
- * None.
+ *
  * Just allocate a new mode, copy the existing mode into it, and return
  * a pointer to it.  Used to create new instances of established modes.
+ *
+ * Returns:
+ * Pointer to duplicated mode on success, NULL on error.
  */
 struct drm_display_mode *drm_mode_duplicate(struct drm_device *dev,
 					    const struct drm_display_mode *mode)
+{
 	struct drm_display_mode *nmode;
 	nmode = drm_mode_create(dev);
 	if (!nmode)
 		return NULL;
 	drm_mode_copy(nmode, mode);
 	return nmode;
+}
 EXPORT_SYMBOL(drm_mode_duplicate);
 /**
  * drm_mode_equal - test modes for equality
  * @mode1: first mode
  * @mode2: second mode
+ *
- * LOCKING:
- * None.
- *
  * Check to see if @mode1 and @mode2 are equivalent.
+ *
- * RETURNS:
+ * Returns:
  * True if the modes are equal, false otherwise.
  */
 bool drm_mode_equal(const struct drm_display_mode *mode1, const struct drm_display_mode *mode2)
+{
 	/* do clock check convert to PICOS so fb modes get matched
 	 * the same */
 	if (mode1->clock && mode2->clock) {
 		if (KHZ2PICOS(mode1->clock) != KHZ2PICOS(mode2->clock))
 			return false;
 	} else if (mode1->clock != mode2->clock)
 		return false;
 	if ((mode1->flags & DRM_MODE_FLAG_3D_MASK) !=
 	    (mode2->flags & DRM_MODE_FLAG_3D_MASK))
 		return false;
 	return drm_mode_equal_no_clocks_no_stereo(mode1, mode2);
+}
 EXPORT_SYMBOL(drm_mode_equal);
 /**
  * drm_mode_equal_no_clocks_no_stereo - test modes for equality
  * @mode1: first mode
  * @mode2: second mode
+ *
- * LOCKING:
- * None.
- *
  * Check to see if @mode1 and @mode2 are equivalent, but
  * don't check the pixel clocks nor the stereo layout.
+ *
- * RETURNS:
+ * Returns:
  * True if the modes are equal, false otherwise.
  */
 bool drm_mode_equal_no_clocks_no_stereo(const struct drm_display_mode *mode1,
 					const struct drm_display_mode *mode2)
+{
 	if (mode1->hdisplay == mode2->hdisplay &&
 	    mode1->hsync_start == mode2->hsync_start &&
 	    mode1->hsync_end == mode2->hsync_end &&
 	    mode1->htotal == mode2->htotal &&
 	    mode1->hskew == mode2->hskew &&
 	    mode1->vdisplay == mode2->vdisplay &&
 	    mode1->vsync_start == mode2->vsync_start &&
 	    mode1->vsync_end == mode2->vsync_end &&
 	    mode1->vtotal == mode2->vtotal &&
 	    mode1->vscan == mode2->vscan &&
 	    (mode1->flags & ~DRM_MODE_FLAG_3D_MASK) ==
 	     (mode2->flags & ~DRM_MODE_FLAG_3D_MASK))
 		return true;
 	return false;
+}
 EXPORT_SYMBOL(drm_mode_equal_no_clocks_no_stereo);
 /**
  * drm_mode_validate_size - make sure modes adhere to size constraints
  * @dev: DRM device
  * @mode_list: list of modes to check
  * @maxX: maximum width
  * @maxY: maximum height
- * @maxPitch: max pitch
+ *
- * LOCKING:
- * Caller must hold a lock protecting @mode_list.
+ * This function is a helper which can be used to validate modes against size
- *
- * The DRM device (@dev) has size and pitch limits.  Here we validate the
+ * limitations of the DRM device/connector. If a mode is too big its status
- * modes we probed for @dev against those limits and set their status as
+ * memeber is updated with the appropriate validation failure code. The list
- * necessary.
+ * itself is not changed.
  */
 void drm_mode_validate_size(struct drm_device *dev,
 			    struct list_head *mode_list,
-			    int maxX, int maxY, int maxPitch)
+			    int maxX, int maxY)
+{
 	struct drm_display_mode *mode;
 	list_for_each_entry(mode, mode_list, head) {
-		if (maxPitch > 0 && mode->hdisplay > maxPitch)
-			mode->status = MODE_BAD_WIDTH;
 		if (maxX > 0 && mode->hdisplay > maxX)
 			mode->status = MODE_VIRTUAL_X;
 		if (maxY > 0 && mode->vdisplay > maxY)
 			mode->status = MODE_VIRTUAL_Y;
+	}
+}
 EXPORT_SYMBOL(drm_mode_validate_size);
 /**
  * drm_mode_prune_invalid - remove invalid modes from mode list
  * @dev: DRM device
  * @mode_list: list of modes to check
  * @verbose: be verbose about it
+ *
- * LOCKING:
- * Caller must hold a lock protecting @mode_list.
+ * This helper function can be used to prune a display mode list after
- *
- * Once mode list generation is complete, a caller can use this routine to
+ * validation has been completed. All modes who's status is not MODE_OK will be
- * remove invalid modes from a mode list.  If any of the modes have a
+ * removed from the list, and if @verbose the status code and mode name is also
- * status other than %MODE_OK, they are removed from @mode_list and freed.
+ * printed to dmesg.
  */
 void drm_mode_prune_invalid(struct drm_device *dev,
 			    struct list_head *mode_list, bool verbose)
+{
 	struct drm_display_mode *mode, *t;
 	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_KMS("Not using %s mode %d\n",
 					mode->name, mode->status);
+			}
 			drm_mode_destroy(dev, mode);
+		}
+	}
+}
 EXPORT_SYMBOL(drm_mode_prune_invalid);
 /**
  * drm_mode_compare - compare modes for favorability
  * @priv: unused
  * @lh_a: list_head for first mode
  * @lh_b: list_head for second mode
+ *
- * LOCKING:
- * None.
- *
  * Compare two modes, given by @lh_a and @lh_b, returning a value indicating
  * which is better.
+ *
- * RETURNS:
+ * Returns:
  * Negative if @lh_a is better than @lh_b, zero if they're equivalent, or
  * positive if @lh_b is better than @lh_a.
  */
 static int drm_mode_compare(void *priv, struct list_head *lh_a, struct list_head *lh_b)
+{
 	struct drm_display_mode *a = list_entry(lh_a, struct drm_display_mode, head);
 	struct drm_display_mode *b = list_entry(lh_b, struct drm_display_mode, head);
 	int diff;
 	diff = ((b->type & DRM_MODE_TYPE_PREFERRED) != 0) -
 		((a->type & DRM_MODE_TYPE_PREFERRED) != 0);
 	if (diff)
 		return diff;
 	diff = b->hdisplay * b->vdisplay - a->hdisplay * a->vdisplay;
 	if (diff)
 		return diff;
 	diff = b->vrefresh - a->vrefresh;
 	if (diff)
 		return diff;
 	diff = b->clock - a->clock;
 	return diff;
+}
 /**
  * drm_mode_sort - sort mode list
- * @mode_list: list to sort
+ * @mode_list: list of drm_display_mode structures to sort
- *
- * LOCKING:
- * Caller must hold a lock protecting @mode_list.
+ *
- * Sort @mode_list by favorability, putting good modes first.
+ * Sort @mode_list by favorability, moving good modes to the head of the list.
  */
 void drm_mode_sort(struct list_head *mode_list)
+{
 	list_sort(NULL, mode_list, drm_mode_compare);
+}
 EXPORT_SYMBOL(drm_mode_sort);
 /**
  * drm_mode_connector_list_update - update the mode list for the connector
  * @connector: the connector to update
- *
- * LOCKING:
- * Caller must hold a lock protecting @mode_list.
+ * @merge_type_bits: whether to merge or overright type bits.
+ *
  * This moves the modes from the @connector probed_modes list
  * to the actual mode list. It compares the probed mode against the current
- * list and only adds different modes. All modes unverified after this point
+ * list and only adds different/new modes.
+ *
+ * This is just a helper functions doesn't validate any modes itself and also
- * will be removed by the prune invalid modes.
+ * doesn't prune any invalid modes. Callers need to do that themselves.
  */
-void drm_mode_connector_list_update(struct drm_connector *connector)
+void drm_mode_connector_list_update(struct drm_connector *connector,
+				    bool merge_type_bits)
+{
 	struct drm_display_mode *mode;
 	struct drm_display_mode *pmode, *pt;
 	int found_it;
+	WARN_ON(!mutex_is_locked(&connector->dev->mode_config.mutex));
 	list_for_each_entry_safe(pmode, pt, &connector->probed_modes,
 				 head) {
 		found_it = 0;
 		/* go through current modes checking for the new probed 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 */
+				if (merge_type_bits)
 				mode->type |= pmode->type;
+				else
+					mode->type = pmode->type;
 				list_del(&pmode->head);
 				drm_mode_destroy(connector->dev, pmode);
 				break;
+			}
+		}
 		if (!found_it) {
 			list_move_tail(&pmode->head, &connector->modes);
+		}
+	}
+}
 EXPORT_SYMBOL(drm_mode_connector_list_update);

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(root)/drivers/video/drm/drm_modes.c – Rev 4560 → 5060