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Intel FB: force even line count in interlaced mode

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Intel FB: the chip adds two halflines automatically in interlaced mode,
force even line count for the right timings.

Signed-off-by: Krzysztof Halasa <khc@pm.waw.pl>
Cc: "Antonino A. Daplas" <adaplas@pol.net>
Cc: <sylvain.meyer@worldonline.fr>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Krzysztof Halasa 2007-10-16 01:29:33 -07:00 committed by Linus Torvalds
parent ee5618f493
commit 28ebe4f66b
1 changed files with 15 additions and 0 deletions
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15
drivers/video/intelfb/intelfbhw.c
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@ -317,6 +317,14 @@ int intelfbhw_validate_mode(struct intelfb_info *dinfo,
var->yres, VACTIVE_MASK + 1);
return 1;
}
if (var->xres < 4) {
WRN_MSG("X resolution too small (%d vs 4).\n", var->xres);
return 1;
}
if (var->yres < 4) {
WRN_MSG("Y resolution too small (%d vs 4).\n", var->yres);
return 1;
}
/* Check for doublescan modes. */
if (var->vmode & FB_VMODE_DOUBLE) {
@ -324,6 +332,11 @@ int intelfbhw_validate_mode(struct intelfb_info *dinfo,
return 1;
}
if ((var->vmode & FB_VMODE_INTERLACED) && (var->yres & 1)) {
WRN_MSG("Odd number of lines in interlaced mode\n");
return 1;
}
/* Check if clock is OK. */
tmp = 1000000000 / var->pixclock;
if (tmp < MIN_CLOCK) {
@ -1127,6 +1140,8 @@ int intelfbhw_mode_to_hw(struct intelfb_info *dinfo,
hblank_end);
vactive = var->yres;
if (var->vmode & FB_VMODE_INTERLACED)
vactive--; /* the chip adds 2 halflines automatically */
vsync_start = vactive + var->lower_margin;
vsync_end = vsync_start + var->vsync_len;
vtotal = vsync_end + var->upper_margin;