cirrusfb: fix interlaced modes
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>
diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 9bb811d..d42e385 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -701,45 +701,52 @@
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) */