diff options
| author | Krzysztof Helt <krzysztof.h1@wp.pl> | 2008-07-23 21:30:56 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@linux-foundation.org> | 2008-07-24 10:47:35 -0700 |
| commit | 6bdf1035602abf0564d24a7447eea1c149c4bcb1 (patch) | |
| tree | b1bd248dd77804f6c9f29040b89f640f477a5ad3 /drivers/video/tridentfb.c | |
| parent | c1724fecabfed504a4cfb87319ad3b9d3a8baa92 (diff) | |
tridentfb: fix clock settings for older Trident 96XX chips
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>
Diffstat (limited to 'drivers/video/tridentfb.c')
| -rw-r--r-- | drivers/video/tridentfb.c | 31 |
1 files changed, 23 insertions, 8 deletions
diff --git a/drivers/video/tridentfb.c b/drivers/video/tridentfb.c index f3153a82f926..8ee4261abf3b 100644 --- a/drivers/video/tridentfb.c +++ b/drivers/video/tridentfb.c @@ -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); |