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path: root/drivers/video/cirrusfb.c
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Diffstat (limited to 'drivers/video/cirrusfb.c')
-rw-r--r--drivers/video/cirrusfb.c50
1 files changed, 21 insertions, 29 deletions
diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c
index 573bd45..30c47f1 100644
--- a/drivers/video/cirrusfb.c
+++ b/drivers/video/cirrusfb.c
@@ -327,10 +327,6 @@ static const struct {
#endif /* CONFIG_ZORRO */
struct cirrusfb_regs {
- long freq;
- long nom;
- long den;
- long div;
long multiplexing;
long mclk;
long divMCLK;
@@ -429,9 +425,7 @@ static void cirrusfb_RectFill(u8 __iomem *regbase, int bits_per_pixel,
u_short width, u_short height,
u_char color, u_short line_length);
-static void bestclock(long freq, long *best,
- long *nom, long *den,
- long *div, long maxfreq);
+static void bestclock(long freq, int *nom, int *den, int *div);
#ifdef CIRRUSFB_DEBUG
static void cirrusfb_dump(void);
@@ -711,9 +705,6 @@ static int cirrusfb_decode_var(const struct fb_var_screeninfo *var,
break;
}
#endif
-
- bestclock(freq, &regs->freq, &regs->nom, &regs->den, &regs->div,
- maxclock);
regs->mclk = cirrusfb_get_mclk(freq, var->bits_per_pixel,
&regs->divMCLK);
@@ -756,6 +747,8 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
const struct cirrusfb_board_info_rec *bi;
int hdispend, hsyncstart, hsyncend, htotal;
int yres, vdispend, vsyncstart, vsyncend, vtotal;
+ long freq;
+ int nom, den, div;
DPRINTK("ENTER\n");
DPRINTK("Requested mode: %dx%dx%d\n",
@@ -903,14 +896,17 @@ static int cirrusfb_set_par_foo(struct fb_info *info)
DPRINTK("CRT1a: %d\n", tmp);
vga_wcrt(regbase, CL_CRT1A, tmp);
+ freq = PICOS2KHZ(var->pixclock);
+ bestclock(freq, &nom, &den, &div);
+
/* set VCLK0 */
/* hardware RefClock: 14.31818 MHz */
/* formula: VClk = (OSC * N) / (D * (1+P)) */
/* Example: VClk = (14.31818 * 91) / (23 * (1+1)) = 28.325 MHz */
- vga_wseq(regbase, CL_SEQRB, regs.nom);
- tmp = regs.den << 1;
- if (regs.div != 0)
+ vga_wseq(regbase, CL_SEQRB, nom);
+ tmp = den << 1;
+ if (div != 0)
tmp |= 1;
/* 6 bit denom; ONLY 5434!!! (bugged me 10 days) */
@@ -2923,16 +2919,14 @@ static void cirrusfb_RectFill(u8 __iomem *regbase, int bits_per_pixel,
* bestclock() - determine closest possible clock lower(?) than the
* desired pixel clock
**************************************************************************/
-static void bestclock(long freq, long *best, long *nom,
- long *den, long *div, long maxfreq)
+static void bestclock(long freq, int *nom, int *den, int *div)
{
- long n, h, d, f;
+ int n, d;
+ long h, diff;
- assert(best != NULL);
assert(nom != NULL);
assert(den != NULL);
assert(div != NULL);
- assert(maxfreq > 0);
*nom = 0;
*den = 0;
@@ -2943,16 +2937,12 @@ static void bestclock(long freq, long *best, long *nom,
if (freq < 8000)
freq = 8000;
- if (freq > maxfreq)
- freq = maxfreq;
-
- *best = 0;
- f = freq * 10;
+ diff = freq;
for (n = 32; n < 128; n++) {
int s = 0;
- d = (143181 * n) / f;
+ d = (14318 * n) / freq;
if ((d >= 7) && (d <= 63)) {
int temp = d;
@@ -2961,8 +2951,9 @@ static void bestclock(long freq, long *best, long *nom,
temp >>= 1;
}
h = ((14318 * n) / temp) >> s;
- if (abs(h - freq) < abs(*best - freq)) {
- *best = h;
+ h = h > freq ? h - freq : freq - h;
+ if (h < diff) {
+ diff = h;
*nom = n;
*den = temp;
*div = s;
@@ -2975,8 +2966,9 @@ static void bestclock(long freq, long *best, long *nom,
d >>= 1;
}
h = ((14318 * n) / d) >> s;
- if (abs(h - freq) < abs(*best - freq)) {
- *best = h;
+ h = h > freq ? h - freq : freq - h;
+ if (h < diff) {
+ diff = h;
*nom = n;
*den = d;
*div = s;
@@ -2985,7 +2977,7 @@ static void bestclock(long freq, long *best, long *nom,
}
DPRINTK("Best possible values for given frequency:\n");
- DPRINTK(" best: %ld kHz nom: %ld den: %ld div: %ld\n",
+ DPRINTK(" freq: %ld kHz nom: %d den: %d div: %d\n",
freq, *nom, *den, *div);
DPRINTK("EXIT\n");