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linux-next/drivers/video/matrox/g450_pll.c
Paul A. Clarke e798bd95b6 matroxfb: rectify jitter (G450/G550) 
This builds upon my previous attempts to resolve some jitter problems seen
with the Matrox G450 and G550 -based cards, including odd disparities observed
between x86 and Power -based machines in a somewhat less hackish way (removing
the hacked ifdefs).

Apparently, preference should be given to use the DVI PLL when frequencies
permit, the Standard PLL otherwise.  The max pixel clock for the panellink
interface is extracted from the PInS information on the card and used as a
limit to determine which PLL to use.

Signed-off-by: Paul A. Clarke <pc@us.ibm.com>
Acked-by: Petr Vandrovec <petr@vandrovec.name>
Signed-off-by: Antonino Daplas <adaplas@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
2007-08-11 15:47:40 -07:00

510 lines
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/*
*
* Hardware accelerated Matrox PCI cards - G450/G550 PLL control.
*
* (c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>
*
* Portions Copyright (c) 2001 Matrox Graphics Inc.
*
* Version: 1.64 2002/06/10
*
* This file is subject to the terms and conditions of the GNU General Public
* License. See the file COPYING in the main directory of this archive for
* more details.
*
*/
#include "g450_pll.h"
#include "matroxfb_DAC1064.h"
static inline unsigned int g450_vco2f(unsigned char p, unsigned int fvco) {
return (p & 0x40) ? fvco : fvco >> ((p & 3) + 1);
}
static inline unsigned int g450_f2vco(unsigned char p, unsigned int fin) {
return (p & 0x40) ? fin : fin << ((p & 3) + 1);
}
static unsigned int g450_mnp2vco(CPMINFO unsigned int mnp) {
unsigned int m, n;
m = ((mnp >> 16) & 0x0FF) + 1;
n = ((mnp >> 7) & 0x1FE) + 4;
return (ACCESS_FBINFO(features).pll.ref_freq * n + (m >> 1)) / m;
}
unsigned int g450_mnp2f(CPMINFO unsigned int mnp) {
return g450_vco2f(mnp, g450_mnp2vco(PMINFO mnp));
}
static inline unsigned int pll_freq_delta(unsigned int f1, unsigned int f2) {
if (f2 < f1) {
f2 = f1 - f2;
} else {
f2 = f2 - f1;
}
return f2;
}
#define NO_MORE_MNP 0x01FFFFFF
#define G450_MNP_FREQBITS (0xFFFFFF43) /* do not mask high byte so we'll catch NO_MORE_MNP */
static unsigned int g450_nextpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* fvco, unsigned int mnp) {
unsigned int m, n, p;
unsigned int tvco = *fvco;
m = (mnp >> 16) & 0xFF;
p = mnp & 0xFF;
do {
if (m == 0 || m == 0xFF) {
if (m == 0) {
if (p & 0x40) {
return NO_MORE_MNP;
}
if (p & 3) {
p--;
} else {
p = 0x40;
}
tvco >>= 1;
if (tvco < pi->vcomin) {
return NO_MORE_MNP;
}
*fvco = tvco;
}
p &= 0x43;
if (tvco < 550000) {
/* p |= 0x00; */
} else if (tvco < 700000) {
p |= 0x08;
} else if (tvco < 1000000) {
p |= 0x10;
} else if (tvco < 1150000) {
p |= 0x18;
} else {
p |= 0x20;
}
m = 9;
} else {
m--;
}
n = ((tvco * (m+1) + ACCESS_FBINFO(features).pll.ref_freq) / (ACCESS_FBINFO(features).pll.ref_freq * 2)) - 2;
} while (n < 0x03 || n > 0x7A);
return (m << 16) | (n << 8) | p;
}
static unsigned int g450_firstpll(CPMINFO const struct matrox_pll_limits* pi, unsigned int* vco, unsigned int fout) {
unsigned int p;
unsigned int vcomax;
vcomax = pi->vcomax;
if (fout > (vcomax / 2)) {
if (fout > vcomax) {
*vco = vcomax;
} else {
*vco = fout;
}
p = 0x40;
} else {
unsigned int tvco;
p = 3;
tvco = g450_f2vco(p, fout);
while (p && (tvco > vcomax)) {
p--;
tvco >>= 1;
}
if (tvco < pi->vcomin) {
tvco = pi->vcomin;
}
*vco = tvco;
}
return g450_nextpll(PMINFO pi, vco, 0xFF0000 | p);
}
static inline unsigned int g450_setpll(CPMINFO unsigned int mnp, unsigned int pll) {
switch (pll) {
case M_PIXEL_PLL_A:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLAP, mnp);
return M1064_XPIXPLLSTAT;
case M_PIXEL_PLL_B:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLBP, mnp);
return M1064_XPIXPLLSTAT;
case M_PIXEL_PLL_C:
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XPIXPLLCP, mnp);
return M1064_XPIXPLLSTAT;
case M_SYSTEM_PLL:
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLM, mnp >> 16);
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLN, mnp >> 8);
matroxfb_DAC_out(PMINFO DAC1064_XSYSPLLP, mnp);
return DAC1064_XSYSPLLSTAT;
case M_VIDEO_PLL:
matroxfb_DAC_out(PMINFO M1064_XVIDPLLM, mnp >> 16);
matroxfb_DAC_out(PMINFO M1064_XVIDPLLN, mnp >> 8);
matroxfb_DAC_out(PMINFO M1064_XVIDPLLP, mnp);
return M1064_XVIDPLLSTAT;
}
return 0;
}
static inline unsigned int g450_cmppll(CPMINFO unsigned int mnp, unsigned int pll) {
unsigned char m = mnp >> 16;
unsigned char n = mnp >> 8;
unsigned char p = mnp;
switch (pll) {
case M_PIXEL_PLL_A:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLAM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLAN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLAP) != p);
case M_PIXEL_PLL_B:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLBM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLBN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLBP) != p);
case M_PIXEL_PLL_C:
return (matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) != m ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) != n ||
matroxfb_DAC_in(PMINFO M1064_XPIXPLLCP) != p);
case M_SYSTEM_PLL:
return (matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLM) != m ||
matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLN) != n ||
matroxfb_DAC_in(PMINFO DAC1064_XSYSPLLP) != p);
case M_VIDEO_PLL:
return (matroxfb_DAC_in(PMINFO M1064_XVIDPLLM) != m ||
matroxfb_DAC_in(PMINFO M1064_XVIDPLLN) != n ||
matroxfb_DAC_in(PMINFO M1064_XVIDPLLP) != p);
}
return 1;
}
static inline int g450_isplllocked(CPMINFO unsigned int regidx) {
unsigned int j;
for (j = 0; j < 1000; j++) {
if (matroxfb_DAC_in(PMINFO regidx) & 0x40) {
unsigned int r = 0;
int i;
for (i = 0; i < 100; i++) {
r += matroxfb_DAC_in(PMINFO regidx) & 0x40;
}
return r >= (90 * 0x40);
}
/* udelay(1)... but DAC_in is much slower... */
}
return 0;
}
static int g450_testpll(CPMINFO unsigned int mnp, unsigned int pll) {
return g450_isplllocked(PMINFO g450_setpll(PMINFO mnp, pll));
}
static void updatehwstate_clk(struct matrox_hw_state* hw, unsigned int mnp, unsigned int pll) {
switch (pll) {
case M_SYSTEM_PLL:
hw->DACclk[3] = mnp >> 16;
hw->DACclk[4] = mnp >> 8;
hw->DACclk[5] = mnp;
break;
}
}
void matroxfb_g450_setpll_cond(WPMINFO unsigned int mnp, unsigned int pll) {
if (g450_cmppll(PMINFO mnp, pll)) {
g450_setpll(PMINFO mnp, pll);
}
}
static inline unsigned int g450_findworkingpll(WPMINFO unsigned int pll, unsigned int* mnparray, unsigned int mnpcount) {
unsigned int found = 0;
unsigned int idx;
unsigned int mnpfound = mnparray[0];
for (idx = 0; idx < mnpcount; idx++) {
unsigned int sarray[3];
unsigned int *sptr;
{
unsigned int mnp;
sptr = sarray;
mnp = mnparray[idx];
if (mnp & 0x38) {
*sptr++ = mnp - 8;
}
if ((mnp & 0x38) != 0x38) {
*sptr++ = mnp + 8;
}
*sptr = mnp;
}
while (sptr >= sarray) {
unsigned int mnp = *sptr--;
if (g450_testpll(PMINFO mnp - 0x0300, pll) &&
g450_testpll(PMINFO mnp + 0x0300, pll) &&
g450_testpll(PMINFO mnp - 0x0200, pll) &&
g450_testpll(PMINFO mnp + 0x0200, pll) &&
g450_testpll(PMINFO mnp - 0x0100, pll) &&
g450_testpll(PMINFO mnp + 0x0100, pll)) {
if (g450_testpll(PMINFO mnp, pll)) {
return mnp;
}
} else if (!found && g450_testpll(PMINFO mnp, pll)) {
mnpfound = mnp;
found = 1;
}
}
}
g450_setpll(PMINFO mnpfound, pll);
return mnpfound;
}
static void g450_addcache(struct matrox_pll_cache* ci, unsigned int mnp_key, unsigned int mnp_value) {
if (++ci->valid > ARRAY_SIZE(ci->data)) {
ci->valid = ARRAY_SIZE(ci->data);
}
memmove(ci->data + 1, ci->data, (ci->valid - 1) * sizeof(*ci->data));
ci->data[0].mnp_key = mnp_key & G450_MNP_FREQBITS;
ci->data[0].mnp_value = mnp_value;
}
static int g450_checkcache(WPMINFO struct matrox_pll_cache* ci, unsigned int mnp_key) {
unsigned int i;
mnp_key &= G450_MNP_FREQBITS;
for (i = 0; i < ci->valid; i++) {
if (ci->data[i].mnp_key == mnp_key) {
unsigned int mnp;
mnp = ci->data[i].mnp_value;
if (i) {
memmove(ci->data + 1, ci->data, i * sizeof(*ci->data));
ci->data[0].mnp_key = mnp_key;
ci->data[0].mnp_value = mnp;
}
return mnp;
}
}
return NO_MORE_MNP;
}
static int __g450_setclk(WPMINFO unsigned int fout, unsigned int pll,
unsigned int* mnparray, unsigned int* deltaarray) {
unsigned int mnpcount;
unsigned int pixel_vco;
const struct matrox_pll_limits* pi;
struct matrox_pll_cache* ci;
pixel_vco = 0;
switch (pll) {
case M_PIXEL_PLL_A:
case M_PIXEL_PLL_B:
case M_PIXEL_PLL_C:
{
u_int8_t tmp, xpwrctrl;
unsigned long flags;
matroxfb_DAC_lock_irqsave(flags);
xpwrctrl = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, xpwrctrl & ~M1064_XPWRCTRL_PANELPDN);
mga_outb(M_SEQ_INDEX, M_SEQ1);
mga_outb(M_SEQ_DATA, mga_inb(M_SEQ_DATA) | M_SEQ1_SCROFF);
tmp = matroxfb_DAC_in(PMINFO M1064_XPIXCLKCTRL);
tmp |= M1064_XPIXCLKCTRL_DIS;
if (!(tmp & M1064_XPIXCLKCTRL_PLL_UP)) {
tmp |= M1064_XPIXCLKCTRL_PLL_UP;
}
matroxfb_DAC_out(PMINFO M1064_XPIXCLKCTRL, tmp);
/* DVI PLL preferred for frequencies up to
panel link max, standard PLL otherwise */
if (fout >= MINFO->max_pixel_clock_panellink)
tmp = 0;
else tmp =
M1064_XDVICLKCTRL_DVIDATAPATHSEL |
M1064_XDVICLKCTRL_C1DVICLKSEL |
M1064_XDVICLKCTRL_C1DVICLKEN |
M1064_XDVICLKCTRL_DVILOOPCTL |
M1064_XDVICLKCTRL_P1LOOPBWDTCTL;
matroxfb_DAC_out(PMINFO M1064_XDVICLKCTRL,tmp);
matroxfb_DAC_out(PMINFO M1064_XPWRCTRL,
xpwrctrl);
matroxfb_DAC_unlock_irqrestore(flags);
}
{
u_int8_t misc;
misc = mga_inb(M_MISC_REG_READ) & ~0x0C;
switch (pll) {
case M_PIXEL_PLL_A:
break;
case M_PIXEL_PLL_B:
misc |= 0x04;
break;
default:
misc |= 0x0C;
break;
}
mga_outb(M_MISC_REG, misc);
}
pi = &ACCESS_FBINFO(limits.pixel);
ci = &ACCESS_FBINFO(cache.pixel);
break;
case M_SYSTEM_PLL:
{
u_int32_t opt;
pci_read_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, &opt);
if (!(opt & 0x20)) {
pci_write_config_dword(ACCESS_FBINFO(pcidev), PCI_OPTION_REG, opt | 0x20);
}
}
pi = &ACCESS_FBINFO(limits.system);
ci = &ACCESS_FBINFO(cache.system);
break;
case M_VIDEO_PLL:
{
u_int8_t tmp;
unsigned int mnp;
unsigned long flags;
matroxfb_DAC_lock_irqsave(flags);
tmp = matroxfb_DAC_in(PMINFO M1064_XPWRCTRL);
if (!(tmp & 2)) {
matroxfb_DAC_out(PMINFO M1064_XPWRCTRL, tmp | 2);
}
mnp = matroxfb_DAC_in(PMINFO M1064_XPIXPLLCM) << 16;
mnp |= matroxfb_DAC_in(PMINFO M1064_XPIXPLLCN) << 8;
pixel_vco = g450_mnp2vco(PMINFO mnp);
matroxfb_DAC_unlock_irqrestore(flags);
}
pi = &ACCESS_FBINFO(limits.video);
ci = &ACCESS_FBINFO(cache.video);
break;
default:
return -EINVAL;
}
mnpcount = 0;
{
unsigned int mnp;
unsigned int xvco;
for(mnp = g450_firstpll(PMINFO pi, &xvco, fout); mnp != NO_MORE_MNP; mnp = g450_nextpll(PMINFO pi, &xvco, mnp)) {
unsigned int idx;
unsigned int vco;
unsigned int delta;
vco = g450_mnp2vco(PMINFO mnp);
#if 0
if (pll == M_VIDEO_PLL) {
unsigned int big, small;
if (vco < pixel_vco) {
small = vco;
big = pixel_vco;
} else {
small = pixel_vco;
big = vco;
}
while (big > small) {
big >>= 1;
}
if (big == small) {
continue;
}
}
#endif
delta = pll_freq_delta(fout, g450_vco2f(mnp, vco));
for (idx = mnpcount; idx > 0; idx--) {
/* == is important; due to nextpll algorithm we get
sorted equally good frequencies from lower VCO
frequency to higher - with <= lowest wins, while
with < highest one wins */
if (delta <= deltaarray[idx-1]) {
/* all else being equal except VCO,
* choose VCO not near (within 1/16th or so) VCOmin
* (freqs near VCOmin aren't as stable)
*/
if (delta == deltaarray[idx-1]
&& vco != g450_mnp2vco(PMINFO mnparray[idx-1])
&& vco < (pi->vcomin * 17 / 16)) {
break;
}
mnparray[idx] = mnparray[idx-1];
deltaarray[idx] = deltaarray[idx-1];
} else {
break;
}
}
mnparray[idx] = mnp;
deltaarray[idx] = delta;
mnpcount++;
}
}
/* VideoPLL and PixelPLL matched: do nothing... In all other cases we should get at least one frequency */
if (!mnpcount) {
return -EBUSY;
}
{
unsigned long flags;
unsigned int mnp;
matroxfb_DAC_lock_irqsave(flags);
mnp = g450_checkcache(PMINFO ci, mnparray[0]);
if (mnp != NO_MORE_MNP) {
matroxfb_g450_setpll_cond(PMINFO mnp, pll);
} else {
mnp = g450_findworkingpll(PMINFO pll, mnparray, mnpcount);
g450_addcache(ci, mnparray[0], mnp);
}
updatehwstate_clk(&ACCESS_FBINFO(hw), mnp, pll);
matroxfb_DAC_unlock_irqrestore(flags);
return mnp;
}
}
/* It must be greater than number of possible PLL values.
* Currently there is 5(p) * 10(m) = 50 possible values. */
#define MNP_TABLE_SIZE 64
int matroxfb_g450_setclk(WPMINFO unsigned int fout, unsigned int pll) {
unsigned int* arr;
arr = kmalloc(sizeof(*arr) * MNP_TABLE_SIZE * 2, GFP_KERNEL);
if (arr) {
int r;
r = __g450_setclk(PMINFO fout, pll, arr, arr + MNP_TABLE_SIZE);
kfree(arr);
return r;
}
return -ENOMEM;
}
EXPORT_SYMBOL(matroxfb_g450_setclk);
EXPORT_SYMBOL(g450_mnp2f);
EXPORT_SYMBOL(matroxfb_g450_setpll_cond);
MODULE_AUTHOR("(c) 2001-2002 Petr Vandrovec <vandrove@vc.cvut.cz>");
MODULE_DESCRIPTION("Matrox G450/G550 PLL driver");
MODULE_LICENSE("GPL");
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