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cirrusfb: fix interlaced modes

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Fix calculations of timings for interlaced modes.

Signed-off-by: Krzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Helt 2009-03-31 15:25:17 -07:00 committed by Linus Torvalds
parent 4242a23c9e
commit 8636a9240c
1 changed files with 21 additions and 14 deletions
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35
drivers/video/cirrusfb.c
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@ -701,45 +701,52 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
hsyncstart = var->xres + var->right_margin;
hsyncend = hsyncstart + var->hsync_len;
htotal = (hsyncend + var->left_margin) / 8 - 5;
hdispend = var->xres / 8 - 1;
hsyncstart = hsyncstart / 8 + 1;
hsyncend = hsyncend / 8 + 1;
htotal = (hsyncend + var->left_margin) / 8;
hdispend = var->xres / 8;
hsyncstart = hsyncstart / 8;
hsyncend = hsyncend / 8;
yres = var->yres;
vsyncstart = yres + var->lower_margin;
vdispend = var->yres;
vsyncstart = vdispend + var->lower_margin;
vsyncend = vsyncstart + var->vsync_len;
vtotal = vsyncend + var->upper_margin;
vdispend = yres - 1;
if (var->vmode & FB_VMODE_DOUBLE) {
yres *= 2;
vdispend *= 2;
vsyncstart *= 2;
vsyncend *= 2;
vtotal *= 2;
} else if (var->vmode & FB_VMODE_INTERLACED) {
yres = (yres + 1) / 2;
vdispend = (vdispend + 1) / 2;
vsyncstart = (vsyncstart + 1) / 2;
vsyncend = (vsyncend + 1) / 2;
vtotal = (vtotal + 1) / 2;
}
vtotal -= 2;
vsyncstart -= 1;
vsyncend -= 1;
yres = vdispend;
if (yres >= 1024) {
vtotal /= 2;
vsyncstart /= 2;
vsyncend /= 2;
vdispend /= 2;
}
vdispend -= 1;
vsyncstart -= 1;
vsyncend -= 1;
vtotal -= 2;
if (cinfo->multiplexing) {
htotal /= 2;
hsyncstart /= 2;
hsyncend /= 2;
hdispend /= 2;
}
htotal -= 5;
hdispend -= 1;
hsyncstart += 1;
hsyncend += 1;
/* unlock register VGA_CRTC_H_TOTAL..CRT7 */
vga_wcrt(regbase, VGA_CRTC_V_SYNC_END, 0x20); /* previously: 0x00) */