2  * linux/drivers/video/fbcvt.c - VESA(TM) Coordinated Video Timings
75 	u32 num = 1000000000/cvt->f_refresh;  in fb_cvt_hperiod()
78 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) {  in fb_cvt_hperiod()
79 		num -= FB_CVT_RB_MIN_VBLANK * 1000;  in fb_cvt_hperiod()
80 		den = 2 * (cvt->yres/cvt->interlace + 2 * cvt->v_margin);  in fb_cvt_hperiod()
82 		num -= FB_CVT_MIN_VSYNC_BP * 1000;  in fb_cvt_hperiod()
83 		den = 2 * (cvt->yres/cvt->interlace + cvt->v_margin * 2  in fb_cvt_hperiod()
84 			   + FB_CVT_MIN_VPORCH + cvt->interlace/2);  in fb_cvt_hperiod()
93 	u32 c_prime = (FB_CVT_GTF_C - FB_CVT_GTF_J) *  in fb_cvt_ideal_duty_cycle()
96 	u32 h_period_est = cvt->hperiod;  in fb_cvt_ideal_duty_cycle()
98 	return (1000 * c_prime  - ((m_prime * h_period_est)/1000))/256;  in fb_cvt_ideal_duty_cycle()
105 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)  in fb_cvt_hblank()
109 		u32 active_pixels = cvt->active_pixels;  in fb_cvt_hblank()
113 				(100000 - 20000);  in fb_cvt_hblank()
116 				(100000 - ideal_duty_cycle);  in fb_cvt_hblank()
120 	hblank &= ~((2 * FB_CVT_CELLSIZE) - 1);  in fb_cvt_hblank()
129 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)  in fb_cvt_hsync()
132 		hsync = (FB_CVT_CELLSIZE * cvt->htotal)/100;  in fb_cvt_hsync()
134 	hsync &= ~(FB_CVT_CELLSIZE - 1);  in fb_cvt_hsync()
142 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) {  in fb_cvt_vbi_lines()
143 		vbi_lines = (1000 * FB_CVT_RB_MIN_VBLANK)/cvt->hperiod + 1;  in fb_cvt_vbi_lines()
144 		min_vbi_lines =  FB_CVT_RB_V_FPORCH + cvt->vsync +  in fb_cvt_vbi_lines()
148 		vbi_lines = (FB_CVT_MIN_VSYNC_BP * 1000)/cvt->hperiod + 1 +  in fb_cvt_vbi_lines()
150 		min_vbi_lines = cvt->vsync + FB_CVT_MIN_BPORCH +  in fb_cvt_vbi_lines()
164 	u32 vtotal = cvt->yres/cvt->interlace;  in fb_cvt_vtotal()
166 	vtotal += 2 * cvt->v_margin + cvt->interlace/2 + fb_cvt_vbi_lines(cvt);  in fb_cvt_vtotal()
167 	vtotal |= cvt->interlace/2;  in fb_cvt_vtotal()
176 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)  in fb_cvt_pixclock()
177 		pixclock = (cvt->f_refresh * cvt->vtotal * cvt->htotal)/1000;  in fb_cvt_pixclock()
179 		pixclock = (cvt->htotal * 1000000)/cvt->hperiod;  in fb_cvt_pixclock()
190 	u32 xres = cvt->xres;  in fb_cvt_aspect_ratio()
191 	u32 yres = cvt->yres;  in fb_cvt_aspect_ratio()
192 	u32 aspect = -1;  in fb_cvt_aspect_ratio()
208 		cvt->status = 1;  in fb_cvt_aspect_ratio()
225 	pixcount = (cvt->xres * (cvt->yres/cvt->interlace))/1000000;  in fb_cvt_print_name()
226 	pixcount_mod = (cvt->xres * (cvt->yres/cvt->interlace)) % 1000000;  in fb_cvt_print_name()
229 	off += scnprintf(buf + off, size - off, "fbcvt: %dx%d@%d: CVT Name - ",  in fb_cvt_print_name()
230 			    cvt->xres, cvt->yres, cvt->refresh);  in fb_cvt_print_name()
232 	if (cvt->status) {  in fb_cvt_print_name()
233 		off += scnprintf(buf + off, size - off,  in fb_cvt_print_name()
234 				 "Not a CVT standard - %d.%03d Mega Pixel Image\n",  in fb_cvt_print_name()
238 			off += scnprintf(buf + off, size - off, "%d", pixcount);  in fb_cvt_print_name()
240 		off += scnprintf(buf + off, size - off, ".%03dM", pixcount_mod);  in fb_cvt_print_name()
242 		if (cvt->aspect_ratio == 0)  in fb_cvt_print_name()
243 			off += scnprintf(buf + off, size - off, "3");  in fb_cvt_print_name()
244 		else if (cvt->aspect_ratio == 3)  in fb_cvt_print_name()
245 			off += scnprintf(buf + off, size - off, "4");  in fb_cvt_print_name()
246 		else if (cvt->aspect_ratio == 1 || cvt->aspect_ratio == 4)  in fb_cvt_print_name()
247 			off += scnprintf(buf + off, size - off, "9");  in fb_cvt_print_name()
248 		else if (cvt->aspect_ratio == 2)  in fb_cvt_print_name()
249 			off += scnprintf(buf + off, size - off, "A");  in fb_cvt_print_name()
251 		if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)  in fb_cvt_print_name()
252 			off += scnprintf(buf + off, size - off, "-R");  in fb_cvt_print_name()
262 	mode->refresh = cvt->f_refresh;  in fb_cvt_convert_to_mode()
263 	mode->pixclock = KHZ2PICOS(cvt->pixclock/1000);  in fb_cvt_convert_to_mode()
264 	mode->left_margin = cvt->h_back_porch;  in fb_cvt_convert_to_mode()
265 	mode->right_margin = cvt->h_front_porch;  in fb_cvt_convert_to_mode()
266 	mode->hsync_len = cvt->hsync;  in fb_cvt_convert_to_mode()
267 	mode->upper_margin = cvt->v_back_porch;  in fb_cvt_convert_to_mode()
268 	mode->lower_margin = cvt->v_front_porch;  in fb_cvt_convert_to_mode()
269 	mode->vsync_len = cvt->vsync;  in fb_cvt_convert_to_mode()
271 	mode->sync &= ~(FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT);  in fb_cvt_convert_to_mode()
273 	if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK)  in fb_cvt_convert_to_mode()
274 		mode->sync |= FB_SYNC_HOR_HIGH_ACT;  in fb_cvt_convert_to_mode()
276 		mode->sync |= FB_SYNC_VERT_HIGH_ACT;  in fb_cvt_convert_to_mode()
280  * fb_find_mode_cvt - calculate mode using VESA(TM) CVT
282  *        pre-filled with the desired values
306 	if (mode->vmode & FB_VMODE_INTERLACED)  in fb_find_mode_cvt()
309 	cvt.xres = mode->xres;  in fb_find_mode_cvt()
310 	cvt.yres = mode->yres;  in fb_find_mode_cvt()
311 	cvt.refresh = mode->refresh;  in fb_find_mode_cvt()
327 	cvt.xres &= ~(FB_CVT_CELLSIZE - 1);  in fb_find_mode_cvt()
344 		cvt.h_margin &= ~(FB_CVT_CELLSIZE - 1);  in fb_find_mode_cvt()
359 	cvt.h_front_porch = cvt.hblank - cvt.hsync - cvt.h_back_porch +  in fb_find_mode_cvt()
362 	cvt.v_back_porch = cvt.vtotal - cvt.yres/cvt.interlace -  in fb_find_mode_cvt()
363 	    cvt.v_front_porch - cvt.vsync;  in fb_find_mode_cvt()