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Commit 6bdf1035 authored by Krzysztof Helt's avatar Krzysztof Helt Committed by Linus Torvalds
Browse files

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: default avatarKrzysztof Helt <krzysztof.h1@wp.pl>
Signed-off-by: default avatarAndrew Morton <akpm@linux-foundation.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@linux-foundation.org>
parent c1724fec

drivers/video/tridentfb.c

+23 −8
Original line number Diff line number Diff line
@@ -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);