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tridentfb: fix clock settings for older Trident 96XX chips

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The Xorg code shows that Trident models 9660, 9680 and 9682 require a
different clock setting method.  Add the second clock setting method for older
models.

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 2008-07-23 21:30:56 -07:00 committed by Linus Torvalds
parent c1724fecab
commit 6bdf103560
1 changed files with 23 additions and 8 deletions
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31
drivers/video/tridentfb.c
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@ -85,6 +85,11 @@ MODULE_PARM_DESC(fp, "Define if flatpanel is connected");
module_param(crt, int, 0);
MODULE_PARM_DESC(crt, "Define if CRT is connected");
static int is_oldclock(int id)
{
return (id == TGUI9660);
}
static int is_blade(int id)
{
return (id == BLADE3D) ||
@ -659,23 +664,33 @@ static void set_screen_start(struct tridentfb_par *par, int base)
static void set_vclk(struct tridentfb_par *par, unsigned long freq)
{
int m, n, k;
unsigned long f, fi, d, di;
unsigned char lo = 0, hi = 0;
unsigned long fi, d, di;
unsigned char best_m = 0, best_n = 0, best_k = 0;
unsigned char hi, lo;
d = 20000;
for (k = 2; k >= 0; k--)
for (m = 0; m < 63; m++)
for (n = 0; n < 128; n++) {
for (k = 1; k >= 0; k--)
for (m = 0; m < 32; m++)
for (n = 0; n < 122; n++) {
fi = ((14318l * (n + 8)) / (m + 2)) >> k;
if ((di = abs(fi - freq)) < d) {
d = di;
f = fi;
lo = n;
hi = (k << 6) | m;
best_n = n;
best_m = m;
best_k = k;
}
if (fi > freq)
break;
}
if (is_oldclock(par->chip_id)) {
lo = best_n | (best_m << 7);
hi = (best_m >> 1) | (best_k << 4);
} else {
lo = best_n;
hi = best_m | (best_k << 6);
}
if (is3Dchip(par->chip_id)) {
vga_mm_wseq(par->io_virt, ClockHigh, hi);
vga_mm_wseq(par->io_virt, ClockLow, lo);