From: Krzysztof Helt <redacted>
This patch fixes following problems:
- does not allow the m parameter to reach 0 as
it locks the graphics core (power cycle needed)
- for the newer chips (with new clock registers)
does not allow of n / m ratio below 4 as it gives
unstable image on the Blade3D core
- extend shift parameter (k) range to 2 for the newer
chips to cope with the n /m >= 4 limit at low resolution
(bandwidth) modes
- prefer modes with higher n / m ratio (higher k values)
Signed-off-by: Krzysztof Helt <redacted>
---
Another test, another patch...
diff -urp linux-old/drivers/video/tridentfb.c linux-new/drivers/video/tridentfb.c
--- linux-old/drivers/video/tridentfb.c 2008-05-30 20:43:03.416124771 +0200
+++ linux-new/drivers/video/tridentfb.c 2008-05-30 21:12:37.887397930 +0200
@@ -672,15 +672,16 @@ static void set_vclk(struct tridentfb_pa
unsigned long fi, d, di;
unsigned char best_m = 0, best_n = 0, best_k = 0;
unsigned char hi, lo;
+ unsigned char shift = !is_oldclock(par->chip_id) ? 2 : 1;
d = 20000;
- for (k = 1; k >= 0; k--)
- for (m = 0; m < 32; m++) {
- n = 2 * (m + 2) - 8;
+ for (k = shift; k >= 0; k--)
+ for (m = 1; m < 32; m++) {
+ n = ((m + 2) << shift) - 8;
for (n = (n < 0 ? 0 : n); n < 122; n++) {
fi = ((14318l * (n + 8)) / (m + 2)) >> k;
di = abs(fi - freq);
- if (di <= d) {
+ if (di < d || (di == d && k == best_k)) {
d = di;
best_n = n;
best_m = m;
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