diff options
| -rw-r--r-- | Documentation/fb/modedb.txt | 73 | ||||
| -rw-r--r-- | drivers/video/Makefile | 3 | ||||
| -rw-r--r-- | drivers/video/fbcvt.c | 380 | ||||
| -rw-r--r-- | drivers/video/fbmem.c | 12 | ||||
| -rw-r--r-- | drivers/video/modedb.c | 62 | ||||
| -rw-r--r-- | include/linux/fb.h | 1 |
6 files changed, 519 insertions, 12 deletions
diff --git a/Documentation/fb/modedb.txt b/Documentation/fb/modedb.txt index e04458b3..4fcdb4c 100644 --- a/Documentation/fb/modedb.txt +++ b/Documentation/fb/modedb.txt @@ -20,12 +20,83 @@ in a video= option, fbmem considers that to be a global video mode option. Valid mode specifiers (mode_option argument): - <xres>x<yres>[-<bpp>][@<refresh>] + <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] <name>[-<bpp>][@<refresh>] with <xres>, <yres>, <bpp> and <refresh> decimal numbers and <name> a string. Things between square brackets are optional. +If 'M' is specified in the mode_option argument (after <yres> and before +<bpp> and <refresh>, if specified) the timings will be calculated using +VESA(TM) Coordinated Video Timings instead of looking up the mode from a table. +If 'R' is specified, do a 'reduced blanking' calculation for digital displays. +If 'i' is specified, calculate for an interlaced mode. And if 'm' is +specified, add margins to the calculation (1.8% of xres rounded down to 8 +pixels and 1.8% of yres). + + Sample usage: 1024x768M@60m - CVT timing with margins + +***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** + +What is the VESA(TM) Coordinated Video Timings (CVT)? + +From the VESA(TM) Website: + + "The purpose of CVT is to provide a method for generating a consistent + and coordinated set of standard formats, display refresh rates, and + timing specifications for computer display products, both those + employing CRTs, and those using other display technologies. The + intention of CVT is to give both source and display manufacturers a + common set of tools to enable new timings to be developed in a + consistent manner that ensures greater compatibility." + +This is the third standard approved by VESA(TM) concerning video timings. The +first was the Discrete Video Timings (DVT) which is a collection of +pre-defined modes approved by VESA(TM). The second is the Generalized Timing +Formula (GTF) which is an algorithm to calculate the timings, given the +pixelclock, the horizontal sync frequency, or the vertical refresh rate. + +The GTF is limited by the fact that it is designed mainly for CRT displays. +It artificially increases the pixelclock because of its high blanking +requirement. This is inappropriate for digital display interface with its high +data rate which requires that it conserves the pixelclock as much as possible. +Also, GTF does not take into account the aspect ratio of the display. + +The CVT addresses these limitations. If used with CRT's, the formula used +is a derivation of GTF with a few modifications. If used with digital +displays, the "reduced blanking" calculation can be used. + +From the framebuffer subsystem perspective, new formats need not be added +to the global mode database whenever a new mode is released by display +manufacturers. Specifying for CVT will work for most, if not all, relatively +new CRT displays and probably with most flatpanels, if 'reduced blanking' +calculation is specified. (The CVT compatibility of the display can be +determined from its EDID. The version 1.3 of the EDID has extra 128-byte +blocks where additional timing information is placed. As of this time, there +is no support yet in the layer to parse this additional blocks.) + +CVT also introduced a new naming convention (should be seen from dmesg output): + + <pix>M<a>[-R] + + where: pix = total amount of pixels in MB (xres x yres) + M = always present + a = aspect ratio (3 - 4:3; 4 - 5:4; 9 - 15:9, 16:9; A - 16:10) + -R = reduced blanking + + example: .48M3-R - 800x600 with reduced blanking + +Note: VESA(TM) has restrictions on what is a standard CVT timing: + + - aspect ratio can only be one of the above values + - acceptable refresh rates are 50, 60, 70 or 85 Hz only + - if reduced blanking, the refresh rate must be at 60Hz + +If one of the above are not satisfied, the kernel will print a warning but the +timings will still be calculated. + +***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** oOo ***** + To find a suitable video mode, you just call int __init fb_find_mode(struct fb_var_screeninfo *var, diff --git a/drivers/video/Makefile b/drivers/video/Makefile index 8478d21..4e7d8d2 100644 --- a/drivers/video/Makefile +++ b/drivers/video/Makefile @@ -9,7 +9,8 @@ obj-$(CONFIG_LOGO) += logo/ obj-$(CONFIG_SYSFS) += backlight/ obj-$(CONFIG_FB) += fb.o -fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o modedb.o +fb-y := fbmem.o fbmon.o fbcmap.o fbsysfs.o \ + modedb.o fbcvt.o fb-objs := $(fb-y) obj-$(CONFIG_FB_CFB_FILLRECT) += cfbfillrect.o diff --git a/drivers/video/fbcvt.c b/drivers/video/fbcvt.c new file mode 100644 index 0000000..cfa61b5 --- /dev/null +++ b/drivers/video/fbcvt.c @@ -0,0 +1,380 @@ +/* + * linux/drivers/video/fbcvt.c - VESA(TM) Coordinated Video Timings + * + * Copyright (C) 2005 Antonino Daplas <adaplas@pol.net> + * + * 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 + * + * 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/fb.h> + +#define FB_CVT_CELLSIZE 8 +#define FB_CVT_GTF_C 40 +#define FB_CVT_GTF_J 20 +#define FB_CVT_GTF_K 128 +#define FB_CVT_GTF_M 600 +#define FB_CVT_MIN_VSYNC_BP 550 +#define FB_CVT_MIN_VPORCH 3 +#define FB_CVT_MIN_BPORCH 6 + +#define FB_CVT_RB_MIN_VBLANK 460 +#define FB_CVT_RB_HBLANK 160 +#define FB_CVT_RB_V_FPORCH 3 + +#define FB_CVT_FLAG_REDUCED_BLANK 1 +#define FB_CVT_FLAG_MARGINS 2 +#define FB_CVT_FLAG_INTERLACED 4 + +struct fb_cvt_data { + u32 xres; + u32 yres; + u32 refresh; + u32 f_refresh; + u32 pixclock; + u32 hperiod; + u32 hblank; + u32 hfreq; + u32 htotal; + u32 vtotal; + u32 vsync; + u32 hsync; + u32 h_front_porch; + u32 h_back_porch; + u32 v_front_porch; + u32 v_back_porch; + u32 h_margin; + u32 v_margin; + u32 interlace; + u32 aspect_ratio; + u32 active_pixels; + u32 flags; + u32 status; +}; + +static int fb_cvt_vbi_tab[] = { + 4, /* 4:3 */ + 5, /* 16:9 */ + 6, /* 16:10 */ + 7, /* 5:4 */ + 7, /* 15:9 */ + 8, /* reserved */ + 9, /* reserved */ + 10 /* custom */ +}; + +/* returns hperiod * 1000 */ +static u32 fb_cvt_hperiod(struct fb_cvt_data *cvt) +{ + u32 num = 1000000000/cvt->f_refresh; + u32 den; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) { + num -= FB_CVT_RB_MIN_VBLANK * 1000; + den = 2 * (cvt->yres/cvt->interlace + 2 * cvt->v_margin); + } else { + num -= FB_CVT_MIN_VSYNC_BP * 1000; + den = 2 * (cvt->yres/cvt->interlace + cvt->v_margin * 2 + + FB_CVT_MIN_VPORCH + cvt->interlace/2); + } + + return 2 * (num/den); +} + +/* returns ideal duty cycle * 1000 */ +static u32 fb_cvt_ideal_duty_cycle(struct fb_cvt_data *cvt) +{ + u32 c_prime = (FB_CVT_GTF_C - FB_CVT_GTF_J) * + (FB_CVT_GTF_K) + 256 * FB_CVT_GTF_J; + u32 m_prime = (FB_CVT_GTF_K * FB_CVT_GTF_M); + u32 h_period_est = cvt->hperiod; + + return (1000 * c_prime - ((m_prime * h_period_est)/1000))/256; +} + +static u32 fb_cvt_hblank(struct fb_cvt_data *cvt) +{ + u32 hblank = 0; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) + hblank = FB_CVT_RB_HBLANK; + else { + u32 ideal_duty_cycle = fb_cvt_ideal_duty_cycle(cvt); + u32 active_pixels = cvt->active_pixels; + + if (ideal_duty_cycle < 20000) + hblank = (active_pixels * 20000)/ + (100000 - 20000); + else { + hblank = (active_pixels * ideal_duty_cycle)/ + (100000 - ideal_duty_cycle); + } + } + + hblank &= ~((2 * FB_CVT_CELLSIZE) - 1); + + return hblank; +} + +static u32 fb_cvt_hsync(struct fb_cvt_data *cvt) +{ + u32 hsync; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) + hsync = 32; + else + hsync = (FB_CVT_CELLSIZE * cvt->htotal)/100; + + hsync &= ~(FB_CVT_CELLSIZE - 1); + return hsync; +} + +static u32 fb_cvt_vbi_lines(struct fb_cvt_data *cvt) +{ + u32 vbi_lines, min_vbi_lines, act_vbi_lines; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) { + vbi_lines = (1000 * FB_CVT_RB_MIN_VBLANK)/cvt->hperiod + 1; + min_vbi_lines = FB_CVT_RB_V_FPORCH + cvt->vsync + + FB_CVT_MIN_BPORCH; + + } else { + vbi_lines = (FB_CVT_MIN_VSYNC_BP * 1000)/cvt->hperiod + 1 + + FB_CVT_MIN_VPORCH; + min_vbi_lines = cvt->vsync + FB_CVT_MIN_BPORCH + + FB_CVT_MIN_VPORCH; + } + + if (vbi_lines < min_vbi_lines) + act_vbi_lines = min_vbi_lines; + else + act_vbi_lines = vbi_lines; + + return act_vbi_lines; +} + +static u32 fb_cvt_vtotal(struct fb_cvt_data *cvt) +{ + u32 vtotal = cvt->yres/cvt->interlace; + + vtotal += 2 * cvt->v_margin + cvt->interlace/2 + fb_cvt_vbi_lines(cvt); + vtotal |= cvt->interlace/2; + + return vtotal; +} + +static u32 fb_cvt_pixclock(struct fb_cvt_data *cvt) +{ + u32 pixclock; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) + pixclock = (cvt->f_refresh * cvt->vtotal * cvt->htotal)/1000; + else + pixclock = (cvt->htotal * 1000000)/cvt->hperiod; + + pixclock /= 250; + pixclock *= 250; + pixclock *= 1000; + + return pixclock; +} + +static u32 fb_cvt_aspect_ratio(struct fb_cvt_data *cvt) +{ + u32 xres = cvt->xres; + u32 yres = cvt->yres; + u32 aspect = -1; + + if (xres == (yres * 4)/3 && !((yres * 4) % 3)) + aspect = 0; + else if (xres == (yres * 16)/9 && !((yres * 16) % 9)) + aspect = 1; + else if (xres == (yres * 16)/10 && !((yres * 16) % 10)) + aspect = 2; + else if (xres == (yres * 5)/4 && !((yres * 5) % 4)) + aspect = 3; + else if (xres == (yres * 15)/9 && !((yres * 15) % 9)) + aspect = 4; + else { + printk(KERN_INFO "fbcvt: Aspect ratio not CVT " + "standard\n"); + aspect = 7; + cvt->status = 1; + } + + return aspect; +} + +static void fb_cvt_print_name(struct fb_cvt_data *cvt) +{ + u32 pixcount, pixcount_mod; + int cnt = 255, offset = 0, read = 0; + u8 *buf = kmalloc(256, GFP_KERNEL); + + if (!buf) + return; + + memset(buf, 0, 256); + pixcount = (cvt->xres * (cvt->yres/cvt->interlace))/1000000; + pixcount_mod = (cvt->xres * (cvt->yres/cvt->interlace)) % 1000000; + pixcount_mod /= 1000; + + read = snprintf(buf+offset, cnt, "fbcvt: %dx%d@%d: CVT Name - ", + cvt->xres, cvt->yres, cvt->refresh); + offset += read; + cnt -= read; + + if (cvt->status) + snprintf(buf+offset, cnt, "Not a CVT standard - %d.%03d Mega " + "Pixel Image\n", pixcount, pixcount_mod); + else { + if (pixcount) { + read = snprintf(buf+offset, cnt, "%d", pixcount); + cnt -= read; + offset += read; + } + + read = snprintf(buf+offset, cnt, ".%03dM", pixcount_mod); + cnt -= read; + offset += read; + + if (cvt->aspect_ratio == 0) + read = snprintf(buf+offset, cnt, "3"); + else if (cvt->aspect_ratio == 3) + read = snprintf(buf+offset, cnt, "4"); + else if (cvt->aspect_ratio == 1 || cvt->aspect_ratio == 4) + read = snprintf(buf+offset, cnt, "9"); + else if (cvt->aspect_ratio == 2) + read = snprintf(buf+offset, cnt, "A"); + else + read = 0; + cnt -= read; + offset += read; + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) { + read = snprintf(buf+offset, cnt, "-R"); + cnt -= read; + offset += read; + } + } + + printk(KERN_INFO "%s\n", buf); + kfree(buf); +} + +static void fb_cvt_convert_to_mode(struct fb_cvt_data *cvt, + struct fb_videomode *mode) +{ + mode->refresh = cvt->f_refresh; + mode->pixclock = KHZ2PICOS(cvt->pixclock/1000); + mode->left_margin = cvt->h_front_porch; + mode->right_margin = cvt->h_back_porch; + mode->hsync_len = cvt->hsync; + mode->upper_margin = cvt->v_front_porch; + mode->lower_margin = cvt->v_back_porch; + mode->vsync_len = cvt->vsync; + + mode->sync &= ~(FB_SYNC_HOR_HIGH_ACT | FB_SYNC_VERT_HIGH_ACT); + + if (cvt->flags & FB_CVT_FLAG_REDUCED_BLANK) + mode->sync |= FB_SYNC_HOR_HIGH_ACT; + else + mode->sync |= FB_SYNC_VERT_HIGH_ACT; +} + +/* + * fb_find_mode_cvt - calculate mode using VESA(TM) CVT + * @mode: pointer to fb_videomode; xres, yres, refresh and vmode must be + * pre-filled with the desired values + * @margins: add margin to calculation (1.8% of xres and yres) + * @rb: compute with reduced blanking (for flatpanels) + * + * RETURNS: + * 0 for success + * @mode is filled with computed values. If interlaced, the refresh field + * will be filled with the field rate (2x the frame rate) + * + * DESCRIPTION: + * Computes video timings using VESA(TM) Coordinated Video Timings + */ +int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb) +{ + struct fb_cvt_data cvt; + + memset(&cvt, 0, sizeof(cvt)); + + if (margins) + cvt.flags |= FB_CVT_FLAG_MARGINS; + + if (rb) + cvt.flags |= FB_CVT_FLAG_REDUCED_BLANK; + + if (mode->vmode & FB_VMODE_INTERLACED) + cvt.flags |= FB_CVT_FLAG_INTERLACED; + + cvt.xres = mode->xres; + cvt.yres = mode->yres; + cvt.refresh = mode->refresh; + cvt.f_refresh = cvt.refresh; + cvt.interlace = 1; + + if (!cvt.xres || !cvt.yres || !cvt.refresh) { + printk(KERN_INFO "fbcvt: Invalid input parameters\n"); + return 1; + } + + if (!(cvt.refresh == 50 || cvt.refresh == 60 || cvt.refresh == 70 || + cvt.refresh == 85)) { + printk(KERN_INFO "fbcvt: Refresh rate not CVT " + "standard\n"); + cvt.status = 1; + } + + cvt.xres &= ~(FB_CVT_CELLSIZE - 1); + + if (cvt.flags & FB_CVT_FLAG_INTERLACED) { + cvt.interlace = 2; + cvt.f_refresh *= 2; + } + + if (cvt.flags & FB_CVT_FLAG_REDUCED_BLANK) { + if (cvt.refresh != 60) { + printk(KERN_INFO "fbcvt: 60Hz refresh rate " + "advised for reduced blanking\n"); + cvt.status = 1; + } + } + + if (cvt.flags & FB_CVT_FLAG_MARGINS) { + cvt.h_margin = (cvt.xres * 18)/1000; + cvt.h_margin &= ~(FB_CVT_CELLSIZE - 1); + cvt.v_margin = ((cvt.yres/cvt.interlace)* 18)/1000; + } + + cvt.aspect_ratio = fb_cvt_aspect_ratio(&cvt); + cvt.active_pixels = cvt.xres + 2 * cvt.h_margin; + cvt.hperiod = fb_cvt_hperiod(&cvt); + cvt.vsync = fb_cvt_vbi_tab[cvt.aspect_ratio]; + cvt.vtotal = fb_cvt_vtotal(&cvt); + cvt.hblank = fb_cvt_hblank(&cvt); + cvt.htotal = cvt.active_pixels + cvt.hblank; + cvt.hsync = fb_cvt_hsync(&cvt); + cvt.pixclock = fb_cvt_pixclock(&cvt); + cvt.hfreq = cvt.pixclock/cvt.htotal; + cvt.h_back_porch = cvt.hblank/2 + cvt.h_margin; + cvt.h_front_porch = cvt.hblank - cvt.hsync - cvt.h_back_porch + + 2 * cvt.h_margin; + cvt.v_back_porch = 3 + cvt.v_margin; + cvt.v_front_porch = cvt.vtotal - cvt.yres/cvt.interlace - + cvt.v_back_porch - cvt.vsync; + fb_cvt_print_name(&cvt); + fb_cvt_convert_to_mode(&cvt, mode); + + return 0; +} +EXPORT_SYMBOL(fb_find_mode_cvt); diff --git a/drivers/video/fbmem.c b/drivers/video/fbmem.c index a815f5e..71b5507 100644 --- a/drivers/video/fbmem.c +++ b/drivers/video/fbmem.c @@ -1029,6 +1029,7 @@ register_framebuffer(struct fb_info *fb_info) { int i; struct fb_event event; + struct fb_videomode mode; if (num_registered_fb == FB_MAX) return -ENXIO; @@ -1059,16 +1060,11 @@ register_framebuffer(struct fb_info *fb_info) } fb_info->pixmap.offset = 0; - if (!fb_info->modelist.prev || - !fb_info->modelist.next || - list_empty(&fb_info->modelist)) { - struct fb_videomode mode; - + if (!fb_info->modelist.prev || !fb_info->modelist.next) INIT_LIST_HEAD(&fb_info->modelist); - fb_var_to_videomode(&mode, &fb_info->var); - fb_add_videomode(&mode, &fb_info->modelist); - } + fb_var_to_videomode(&mode, &fb_info->var); + fb_add_videomode(&mode, &fb_info->modelist); registered_fb[i] = fb_info; devfs_mk_cdev(MKDEV(FB_MAJOR, i), diff --git a/drivers/video/modedb.c b/drivers/video/modedb.c index 3edc9f4..47516c4 100644 --- a/drivers/video/modedb.c +++ b/drivers/video/modedb.c @@ -456,12 +456,22 @@ static int fb_try_mode(struct fb_var_screeninfo *var, struct fb_info *info, * * Valid mode specifiers for @mode_option: * - * <xres>x<yres>[-<bpp>][@<refresh>] or + * <xres>x<yres>[M][R][-<bpp>][@<refresh>][i][m] or * <name>[-<bpp>][@<refresh>] * * with <xres>, <yres>, <bpp> and <refresh> decimal numbers and * <name> a string. * + * If 'M' is present after yres (and before refresh/bpp if present), + * the function will compute the timings using VESA(tm) Coordinated + * Video Timings (CVT). If 'R' is present after 'M', will compute with + * reduced blanking (for flatpanels). If 'i' is present, compute + * interlaced mode. If 'm' is present, add margins equal to 1.8% + * of xres rounded down to 8 pixels, and 1.8% of yres. The char + * 'i' and 'm' must be after 'M' and 'R'. Example: + * + * 1024x768MR-8@60m - Reduced blank with margins at 60Hz. + * * NOTE: The passed struct @var is _not_ cleared! This allows you * to supply values for e.g. the grayscale and accel_flags fields. * @@ -495,7 +505,7 @@ int fb_find_mode(struct fb_var_screeninfo *var, unsigned int namelen = strlen(name); int res_specified = 0, bpp_specified = 0, refresh_specified = 0; unsigned int xres = 0, yres = 0, bpp = default_bpp, refresh = 0; - int yres_specified = 0; + int yres_specified = 0, cvt = 0, rb = 0, interlace = 0, margins = 0; u32 best, diff; for (i = namelen-1; i >= 0; i--) { @@ -506,6 +516,8 @@ int fb_find_mode(struct fb_var_screeninfo *var, !yres_specified) { refresh = my_atoi(&name[i+1]); refresh_specified = 1; + if (cvt || rb) + cvt = 0; } else goto done; break; @@ -514,6 +526,8 @@ int fb_find_mode(struct fb_var_screeninfo *var, if (!bpp_specified && !yres_specified) { bpp = my_atoi(&name[i+1]); bpp_specified = 1; + if (cvt || rb) + cvt = 0; } else goto done; break; @@ -526,6 +540,22 @@ int fb_find_mode(struct fb_var_screeninfo *var, break; case '0'...'9': break; + case 'M': + if (!yres_specified) + cvt = 1; + break; + case 'R': + if (!cvt) + rb = 1; + break; + case 'm': + if (!cvt) + margins = 1; + break; + case 'i': + if (!cvt) + interlace = 1; + break; default: goto done; } @@ -535,6 +565,34 @@ int fb_find_mode(struct fb_var_screeninfo *var, res_specified = 1; } done: + if (cvt) { + struct fb_videomode cvt_mode; + int ret; + + DPRINTK("CVT mode %dx%d@%dHz%s%s%s\n", xres, yres, + (refresh) ? refresh : 60, (rb) ? " reduced blanking" : + "", (margins) ? " with margins" : "", (interlace) ? + " interlaced" : ""); + + cvt_mode.xres = xres; + cvt_mode.yres = yres; + cvt_mode.refresh = (refresh) ? refresh : 60; + + if (interlace) + cvt_mode.vmode |= FB_VMODE_INTERLACED; + else + cvt_mode.vmode &= ~FB_VMODE_INTERLACED; + + ret = fb_find_mode_cvt(&cvt_mode, margins, rb); + + if (!ret && !fb_try_mode(var, info, &cvt_mode, bpp)) { + DPRINTK("modedb CVT: CVT mode ok\n"); + return 1; + } + + DPRINTK("CVT mode invalid, getting mode from database\n"); + } + DPRINTK("Trying specified video mode%s %ix%i\n", refresh_specified ? "" : " (ignoring refresh rate)", xres, yres); diff --git a/include/linux/fb.h b/include/linux/fb.h index 34814a0..9a4f035 100644 --- a/include/linux/fb.h +++ b/include/linux/fb.h @@ -866,6 +866,7 @@ extern const unsigned char *fb_firmware_edid(struct device *device); extern void fb_edid_to_monspecs(unsigned char *edid, struct fb_monspecs *specs); extern void fb_destroy_modedb(struct fb_videomode *modedb); +extern int fb_find_mode_cvt(struct fb_videomode *mode, int margins, int rb); /* drivers/video/modedb.c */ #define VESA_MODEDB_SIZE 34 |
