From: Krzysztof Helt 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 Signed-off-by: Andrew Morton --- drivers/video/tridentfb.c | 9 +++++---- 1 file changed, 5 insertions(+), 4 deletions(-) diff -puN drivers/video/tridentfb.c~tridentfb-blade3d-clock-fixes drivers/video/tridentfb.c --- a/drivers/video/tridentfb.c~tridentfb-blade3d-clock-fixes +++ a/drivers/video/tridentfb.c @@ -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; _