drivers/video/fbdev/i810/i810_gtf.c - linux - Git at Google

 /*-*- linux-c -*-
  *  linux/drivers/video/i810_main.h -- Intel 810 Non-discrete Video Timings
  *                                     (VESA GTF)
  *
  *      Copyright (C) 2001 Antonino Daplas<adaplas@pol.net>
  *      All Rights Reserved
  *
  *
  *  This file is subject to the terms and conditions of the GNU General Public
  *  License. See the file COPYING in the main directory of this archive for
  *  more details.
  */
 #include <linux/kernel.h>

 #include "i810_regs.h"
 #include "i810.h"
 #include "i810_main.h"

 /*
  * FIFO and Watermark tables - based almost wholly on i810_wmark.c in
  * XFree86 v4.03 by Precision Insight.  Slightly modified for integer
  * operation, instead of float
  */

 struct wm_info {
    u32 freq;
    u32  wm;
 };

 static struct wm_info i810_wm_8_100[] = {
 	{ 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
 	{ 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
 	{ 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
 	{ 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
 	{ 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
 	{ 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
 	{ 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
 	{ 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
 	{ 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
 	{ 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
 	{ 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
 };

 static struct wm_info i810_wm_16_100[] = {
 	{ 15, 0x0070c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
 	{ 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
 	{ 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
 	{ 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
 	{ 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
 	{ 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
 	{ 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
 	{ 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
 	{ 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
 	{ 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
 	{ 218, 0x22416000 }, { 229, 0x22416000 },
 };

 static struct wm_info i810_wm_24_100[] = {
 	{ 15, 0x0020c000 },  { 19, 0x0040c000 },  { 25, 0x22009000 },
 	{ 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
 	{ 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
 	{ 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
 	{ 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
 	{ 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
 	{ 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
 	{ 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
 	{ 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
 	{ 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
 };

 static struct wm_info i810_wm_8_133[] = {
 	{ 15, 0x0070c000 },  { 19, 0x0070c000 },  { 25, 0x22003000 },
 	{ 28, 0x22003000 },  { 31, 0x22003000 },  { 36, 0x22007000 },
 	{ 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22008000 },
 	{ 50, 0x22008000 },  { 56, 0x22008000 },  { 65, 0x22008000 },
 	{ 75, 0x22008000 },  { 78, 0x22008000 },  { 80, 0x22008000 },
 	{ 94, 0x22008000 },  { 96, 0x22107000 },  { 99, 0x22107000 },
 	{ 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
 	{ 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
 	{ 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
 	{ 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
 	{ 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
 };

 static struct wm_info i810_wm_16_133[] = {
 	{ 15, 0x0020c000 },  { 19, 0x0020c000 },  { 25, 0x22006000 },
 	{ 28, 0x22006000 },  { 31, 0x22007000 },  { 36, 0x22007000 },
 	{ 40, 0x22007000 },  { 45, 0x22007000 },  { 49, 0x22009000 },
 	{ 50, 0x22009000 },  { 56, 0x22108000 },  { 65, 0x2210e000 },
 	{ 75, 0x2210e000 },  { 78, 0x2210e000 },  { 80, 0x22210000 },
 	{ 94, 0x22210000 },  { 96, 0x22210000 },  { 99, 0x22210000 },
 	{ 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
 	{ 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
 	{ 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
 	{ 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
 	{ 218, 0x22416000 }, { 229, 0x22416000 },
 };

 static struct wm_info i810_wm_24_133[] = {
 	{ 15, 0x0020c000 },  { 19, 0x00408000 },  { 25, 0x22009000 },
 	{ 28, 0x22009000 },  { 31, 0x2200a000 },  { 36, 0x2210c000 },
 	{ 40, 0x2210c000 },  { 45, 0x2210c000 },  { 49, 0x22111000 },
 	{ 50, 0x22111000 },  { 56, 0x22111000 },  { 65, 0x22214000 },
 	{ 75, 0x22214000 },  { 78, 0x22215000 },  { 80, 0x22216000 },
 	{ 94, 0x22218000 },  { 96, 0x22418000 },  { 99, 0x22418000 },
 	{ 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
 	{ 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
 	{ 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
 	{ 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
 };

 void round_off_xres(u32 *xres) { }
 void round_off_yres(u32 *xres, u32 *yres) { }

 /**
  * i810fb_encode_registers - encode @var to hardware register values
  * @var: pointer to var structure
  * @par: pointer to hardware par structure
  *
  * DESCRIPTION:
  * Timing values in @var will be converted to appropriate
  * register values of @par.
  */
 void i810fb_encode_registers(const struct fb_var_screeninfo *var,
 			     struct i810fb_par *par, u32 xres, u32 yres)
 {
 	int n, blank_s, blank_e;
 	u8 __iomem *mmio = par->mmio_start_virtual;
 	u8 msr = 0;

 	/* Horizontal */
 	/* htotal */
 	n = ((xres + var->right_margin + var->hsync_len +
 	      var->left_margin) >> 3) - 5;
 	par->regs.cr00 =  (u8) n;
 	par->regs.cr35 = (u8) ((n >> 8) & 1);

 	/* xres */
 	par->regs.cr01 = (u8) ((xres >> 3) - 1);

 	/* hblank */
 	blank_e = (xres + var->right_margin + var->hsync_len +
 		   var->left_margin) >> 3;
 	blank_e--;
 	blank_s = blank_e - 127;
 	if (blank_s < (xres >> 3))
 		blank_s = xres >> 3;
 	par->regs.cr02 = (u8) blank_s;
 	par->regs.cr03 = (u8) (blank_e & 0x1F);
 	par->regs.cr05 = (u8) ((blank_e & (1 << 5)) << 2);
 	par->regs.cr39 = (u8) ((blank_e >> 6) & 1);

 	/* hsync */
 	par->regs.cr04 = (u8) ((xres + var->right_margin) >> 3);
 	par->regs.cr05 |= (u8) (((xres + var->right_margin +
 				  var->hsync_len) >> 3) & 0x1F);

        	/* Vertical */
 	/* vtotal */
 	n = yres + var->lower_margin + var->vsync_len + var->upper_margin - 2;
 	par->regs.cr06 = (u8) (n & 0xFF);
 	par->regs.cr30 = (u8) ((n >> 8) & 0x0F);

 	/* vsync */
 	n = yres + var->lower_margin;
 	par->regs.cr10 = (u8) (n & 0xFF);
 	par->regs.cr32 = (u8) ((n >> 8) & 0x0F);
 	par->regs.cr11 = i810_readb(CR11, mmio) & ~0x0F;
 	par->regs.cr11 |= (u8) ((yres + var->lower_margin +
 				 var->vsync_len) & 0x0F);

 	/* yres */
 	n = yres - 1;
 	par->regs.cr12 = (u8) (n & 0xFF);
 	par->regs.cr31 = (u8) ((n >> 8) & 0x0F);

 	/* vblank */
 	blank_e = yres + var->lower_margin + var->vsync_len +
 		var->upper_margin;
 	blank_e--;
 	blank_s = blank_e - 127;
 	if (blank_s < yres)
 		blank_s = yres;
 	par->regs.cr15 = (u8) (blank_s & 0xFF);
 	par->regs.cr33 = (u8) ((blank_s >> 8) & 0x0F);
 	par->regs.cr16 = (u8) (blank_e & 0xFF);
 	par->regs.cr09 = 0;

 	/* sync polarity */
 	if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
 		msr |= 1 << 6;
 	if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
 		msr |= 1 << 7;
 	par->regs.msr = msr;

 	/* interlace */
 	if (var->vmode & FB_VMODE_INTERLACED)
 		par->interlace = (1 << 7) | ((u8) (var->yres >> 4));
 	else
 		par->interlace = 0;

 	if (var->vmode & FB_VMODE_DOUBLE)
 		par->regs.cr09 |= 1 << 7;

 	/* overlay */
 	par->ovract = ((var->xres + var->right_margin + var->hsync_len +
 			var->left_margin - 32) | ((var->xres - 32) << 16));
 }

 void i810fb_fill_var_timings(struct fb_var_screeninfo *var) { }

 /**
  * i810_get_watermark - gets watermark
  * @var: pointer to fb_var_screeninfo
  * @par: pointer to i810fb_par structure
  *
  * DESCRIPTION:
  * Gets the required watermark based on
  * pixelclock and RAMBUS frequency.
  *
  * RETURNS:
  * watermark
  */
 u32 i810_get_watermark(const struct fb_var_screeninfo *var,
 		       struct i810fb_par *par)
 {
 	struct wm_info *wmark = NULL;
 	u32 i, size = 0, pixclock, wm_best = 0, min, diff;

 	if (par->mem_freq == 100) {
 		switch (var->bits_per_pixel) {
 		case 8:
 			wmark = i810_wm_8_100;
 			size = ARRAY_SIZE(i810_wm_8_100);
 			break;
 		case 16:
 			wmark = i810_wm_16_100;
 			size = ARRAY_SIZE(i810_wm_16_100);
 			break;
 		case 24:
 		case 32:
 			wmark = i810_wm_24_100;
 			size = ARRAY_SIZE(i810_wm_24_100);
 		}
 	} else {
 		switch(var->bits_per_pixel) {
 		case 8:
 			wmark = i810_wm_8_133;
 			size = ARRAY_SIZE(i810_wm_8_133);
 			break;
 		case 16:
 			wmark = i810_wm_16_133;
 			size = ARRAY_SIZE(i810_wm_16_133);
 			break;
 		case 24:
 		case 32:
 			wmark = i810_wm_24_133;
 			size = ARRAY_SIZE(i810_wm_24_133);
 		}
 	}

 	pixclock = 1000000/var->pixclock;
 	min = ~0;
 	for (i = 0; i < size; i++) {
 		if (pixclock <= wmark[i].freq)
 			diff = wmark[i].freq - pixclock;
 		else
 			diff = pixclock - wmark[i].freq;
 		if (diff < min) {
 			wm_best = wmark[i].wm;
 			min = diff;
 		}
 	}
 	return wm_best;
 }
	/-- linux-c -*-
	* linux/drivers/video/i810_main.h -- Intel 810 Non-discrete Video Timings
	* (VESA GTF)
	*
	* Copyright (C) 2001 Antonino Daplas<adaplas@pol.net>
	* All Rights Reserved
	*
	*
	* This file is subject to the terms and conditions of the GNU General Public
	* License. See the file COPYING in the main directory of this archive for
	* more details.
	*/
	#include <linux/kernel.h>

	#include "i810_regs.h"
	#include "i810.h"
	#include "i810_main.h"

	/*
	* FIFO and Watermark tables - based almost wholly on i810_wmark.c in
	* XFree86 v4.03 by Precision Insight. Slightly modified for integer
	* operation, instead of float
	*/

	struct wm_info {
	u32 freq;
	u32 wm;
	};

	static struct wm_info i810_wm_8_100[] = {
	{ 15, 0x0070c000 }, { 19, 0x0070c000 }, { 25, 0x22003000 },
	{ 28, 0x22003000 }, { 31, 0x22003000 }, { 36, 0x22007000 },
	{ 40, 0x22007000 }, { 45, 0x22007000 }, { 49, 0x22008000 },
	{ 50, 0x22008000 }, { 56, 0x22008000 }, { 65, 0x22008000 },
	{ 75, 0x22008000 }, { 78, 0x22008000 }, { 80, 0x22008000 },
	{ 94, 0x22008000 }, { 96, 0x22107000 }, { 99, 0x22107000 },
	{ 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
	{ 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
	{ 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
	{ 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
	{ 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
	};

	static struct wm_info i810_wm_16_100[] = {
	{ 15, 0x0070c000 }, { 19, 0x0020c000 }, { 25, 0x22006000 },
	{ 28, 0x22006000 }, { 31, 0x22007000 }, { 36, 0x22007000 },
	{ 40, 0x22007000 }, { 45, 0x22007000 }, { 49, 0x22009000 },
	{ 50, 0x22009000 }, { 56, 0x22108000 }, { 65, 0x2210e000 },
	{ 75, 0x2210e000 }, { 78, 0x2210e000 }, { 80, 0x22210000 },
	{ 94, 0x22210000 }, { 96, 0x22210000 }, { 99, 0x22210000 },
	{ 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
	{ 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
	{ 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
	{ 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
	{ 218, 0x22416000 }, { 229, 0x22416000 },
	};

	static struct wm_info i810_wm_24_100[] = {
	{ 15, 0x0020c000 }, { 19, 0x0040c000 }, { 25, 0x22009000 },
	{ 28, 0x22009000 }, { 31, 0x2200a000 }, { 36, 0x2210c000 },
	{ 40, 0x2210c000 }, { 45, 0x2210c000 }, { 49, 0x22111000 },
	{ 50, 0x22111000 }, { 56, 0x22111000 }, { 65, 0x22214000 },
	{ 75, 0x22214000 }, { 78, 0x22215000 }, { 80, 0x22216000 },
	{ 94, 0x22218000 }, { 96, 0x22418000 }, { 99, 0x22418000 },
	{ 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
	{ 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
	{ 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
	{ 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
	};

	static struct wm_info i810_wm_8_133[] = {
	{ 15, 0x0070c000 }, { 19, 0x0070c000 }, { 25, 0x22003000 },
	{ 28, 0x22003000 }, { 31, 0x22003000 }, { 36, 0x22007000 },
	{ 40, 0x22007000 }, { 45, 0x22007000 }, { 49, 0x22008000 },
	{ 50, 0x22008000 }, { 56, 0x22008000 }, { 65, 0x22008000 },
	{ 75, 0x22008000 }, { 78, 0x22008000 }, { 80, 0x22008000 },
	{ 94, 0x22008000 }, { 96, 0x22107000 }, { 99, 0x22107000 },
	{ 108, 0x22107000 }, { 121, 0x22107000 }, { 128, 0x22107000 },
	{ 132, 0x22109000 }, { 135, 0x22109000 }, { 157, 0x2210b000 },
	{ 162, 0x2210b000 }, { 175, 0x2210b000 }, { 189, 0x2220e000 },
	{ 195, 0x2220e000 }, { 202, 0x2220e000 }, { 204, 0x2220e000 },
	{ 218, 0x2220f000 }, { 229, 0x22210000 }, { 234, 0x22210000 },
	};

	static struct wm_info i810_wm_16_133[] = {
	{ 15, 0x0020c000 }, { 19, 0x0020c000 }, { 25, 0x22006000 },
	{ 28, 0x22006000 }, { 31, 0x22007000 }, { 36, 0x22007000 },
	{ 40, 0x22007000 }, { 45, 0x22007000 }, { 49, 0x22009000 },
	{ 50, 0x22009000 }, { 56, 0x22108000 }, { 65, 0x2210e000 },
	{ 75, 0x2210e000 }, { 78, 0x2210e000 }, { 80, 0x22210000 },
	{ 94, 0x22210000 }, { 96, 0x22210000 }, { 99, 0x22210000 },
	{ 108, 0x22210000 }, { 121, 0x22210000 }, { 128, 0x22210000 },
	{ 132, 0x22314000 }, { 135, 0x22314000 }, { 157, 0x22415000 },
	{ 162, 0x22416000 }, { 175, 0x22416000 }, { 189, 0x22416000 },
	{ 195, 0x22416000 }, { 202, 0x22416000 }, { 204, 0x22416000 },
	{ 218, 0x22416000 }, { 229, 0x22416000 },
	};

	static struct wm_info i810_wm_24_133[] = {
	{ 15, 0x0020c000 }, { 19, 0x00408000 }, { 25, 0x22009000 },
	{ 28, 0x22009000 }, { 31, 0x2200a000 }, { 36, 0x2210c000 },
	{ 40, 0x2210c000 }, { 45, 0x2210c000 }, { 49, 0x22111000 },
	{ 50, 0x22111000 }, { 56, 0x22111000 }, { 65, 0x22214000 },
	{ 75, 0x22214000 }, { 78, 0x22215000 }, { 80, 0x22216000 },
	{ 94, 0x22218000 }, { 96, 0x22418000 }, { 99, 0x22418000 },
	{ 108, 0x22418000 }, { 121, 0x22418000 }, { 128, 0x22419000 },
	{ 132, 0x22519000 }, { 135, 0x4441d000 }, { 157, 0x44419000 },
	{ 162, 0x44419000 }, { 175, 0x44419000 }, { 189, 0x44419000 },
	{ 195, 0x44419000 }, { 202, 0x44419000 }, { 204, 0x44419000 },
	};

	void round_off_xres(u32 *xres) { }
	void round_off_yres(u32 xres, u32 yres) { }

	/**
	* i810fb_encode_registers - encode @var to hardware register values
	* @var: pointer to var structure
	* @par: pointer to hardware par structure
	*
	* DESCRIPTION:
	* Timing values in @var will be converted to appropriate
	* register values of @par.
	*/
	void i810fb_encode_registers(const struct fb_var_screeninfo *var,
	struct i810fb_par *par, u32 xres, u32 yres)
	{
	int n, blank_s, blank_e;
	u8 __iomem *mmio = par->mmio_start_virtual;
	u8 msr = 0;

	/* Horizontal */
	/* htotal */
	n = ((xres + var->right_margin + var->hsync_len +
	var->left_margin) >> 3) - 5;
	par->regs.cr00 = (u8) n;
	par->regs.cr35 = (u8) ((n >> 8) & 1);

	/* xres */
	par->regs.cr01 = (u8) ((xres >> 3) - 1);

	/* hblank */
	blank_e = (xres + var->right_margin + var->hsync_len +
	var->left_margin) >> 3;
	blank_e--;
	blank_s = blank_e - 127;
	if (blank_s < (xres >> 3))
	blank_s = xres >> 3;
	par->regs.cr02 = (u8) blank_s;
	par->regs.cr03 = (u8) (blank_e & 0x1F);
	par->regs.cr05 = (u8) ((blank_e & (1 << 5)) << 2);
	par->regs.cr39 = (u8) ((blank_e >> 6) & 1);

	/* hsync */
	par->regs.cr04 = (u8) ((xres + var->right_margin) >> 3);
	par->regs.cr05 \|= (u8) (((xres + var->right_margin +
	var->hsync_len) >> 3) & 0x1F);

	/* Vertical */
	/* vtotal */
	n = yres + var->lower_margin + var->vsync_len + var->upper_margin - 2;
	par->regs.cr06 = (u8) (n & 0xFF);
	par->regs.cr30 = (u8) ((n >> 8) & 0x0F);

	/* vsync */
	n = yres + var->lower_margin;
	par->regs.cr10 = (u8) (n & 0xFF);
	par->regs.cr32 = (u8) ((n >> 8) & 0x0F);
	par->regs.cr11 = i810_readb(CR11, mmio) & ~0x0F;
	par->regs.cr11 \|= (u8) ((yres + var->lower_margin +
	var->vsync_len) & 0x0F);

	/* yres */
	n = yres - 1;
	par->regs.cr12 = (u8) (n & 0xFF);
	par->regs.cr31 = (u8) ((n >> 8) & 0x0F);

	/* vblank */
	blank_e = yres + var->lower_margin + var->vsync_len +
	var->upper_margin;
	blank_e--;
	blank_s = blank_e - 127;
	if (blank_s < yres)
	blank_s = yres;
	par->regs.cr15 = (u8) (blank_s & 0xFF);
	par->regs.cr33 = (u8) ((blank_s >> 8) & 0x0F);
	par->regs.cr16 = (u8) (blank_e & 0xFF);
	par->regs.cr09 = 0;

	/* sync polarity */
	if (!(var->sync & FB_SYNC_HOR_HIGH_ACT))
	msr \|= 1 << 6;
	if (!(var->sync & FB_SYNC_VERT_HIGH_ACT))
	msr \|= 1 << 7;
	par->regs.msr = msr;

	/* interlace */
	if (var->vmode & FB_VMODE_INTERLACED)
	par->interlace = (1 << 7) \| ((u8) (var->yres >> 4));
	else
	par->interlace = 0;

	if (var->vmode & FB_VMODE_DOUBLE)
	par->regs.cr09 \|= 1 << 7;

	/* overlay */
	par->ovract = ((var->xres + var->right_margin + var->hsync_len +
	var->left_margin - 32) \| ((var->xres - 32) << 16));
	}

	void i810fb_fill_var_timings(struct fb_var_screeninfo *var) { }

	/**
	* i810_get_watermark - gets watermark
	* @var: pointer to fb_var_screeninfo
	* @par: pointer to i810fb_par structure
	*
	* DESCRIPTION:
	* Gets the required watermark based on
	* pixelclock and RAMBUS frequency.
	*
	* RETURNS:
	* watermark
	*/
	u32 i810_get_watermark(const struct fb_var_screeninfo *var,
	struct i810fb_par *par)
	{
	struct wm_info *wmark = NULL;
	u32 i, size = 0, pixclock, wm_best = 0, min, diff;

	if (par->mem_freq == 100) {
	switch (var->bits_per_pixel) {
	case 8:
	wmark = i810_wm_8_100;
	size = ARRAY_SIZE(i810_wm_8_100);
	break;
	case 16:
	wmark = i810_wm_16_100;
	size = ARRAY_SIZE(i810_wm_16_100);
	break;
	case 24:
	case 32:
	wmark = i810_wm_24_100;
	size = ARRAY_SIZE(i810_wm_24_100);
	}
	} else {
	switch(var->bits_per_pixel) {
	case 8:
	wmark = i810_wm_8_133;
	size = ARRAY_SIZE(i810_wm_8_133);
	break;
	case 16:
	wmark = i810_wm_16_133;
	size = ARRAY_SIZE(i810_wm_16_133);
	break;
	case 24:
	case 32:
	wmark = i810_wm_24_133;
	size = ARRAY_SIZE(i810_wm_24_133);
	}
	}

	pixclock = 1000000/var->pixclock;
	min = ~0;
	for (i = 0; i < size; i++) {
	if (pixclock <= wmark[i].freq)
	diff = wmark[i].freq - pixclock;
	else
	diff = pixclock - wmark[i].freq;
	if (diff < min) {
	wm_best = wmark[i].wm;
	min = diff;
	}
	}
	return wm_best;
	}