diff options
Diffstat (limited to 'drivers/video')
| -rw-r--r-- | drivers/video/cirrusfb.c | 50 |
1 files changed, 21 insertions, 29 deletions
diff --git a/drivers/video/cirrusfb.c b/drivers/video/cirrusfb.c index 573bd456e5a..30c47f16760 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, ®s->freq, ®s->nom, ®s->den, ®s->div, - maxclock); regs->mclk = cirrusfb_get_mclk(freq, var->bits_per_pixel, ®s->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"); |