summaryrefslogtreecommitdiffstats
path: root/drivers/video/aty/mach64_ct.c
diff options
context:
space:
mode:
authorVille Syrjälä <syrjala@sci.fi>2006-01-09 20:53:27 -0800
committerLinus Torvalds <torvalds@g5.osdl.org>2006-01-10 08:01:48 -0800
commit25163c56ed88a3009e7c1d808d3a052357301d63 (patch)
tree8b70b0c0e0cb1d84b1e9b75ebe57088a52c510ac /drivers/video/aty/mach64_ct.c
parente98cef1e9e0ef0c5c02f6f3daa4da7956ad1c9ea (diff)
[PATCH] atyfb: Set ECP divider
Set ECP (scaler/overlay clock) divider. The limits were taken from the XFree86 ati driver. Signed-off-by: Ville Syrjälä <syrjala@sci.fi> Signed-off-by: Antonino Daplas <adaplas@pol.net> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'drivers/video/aty/mach64_ct.c')
-rw-r--r--drivers/video/aty/mach64_ct.c17
1 files changed, 14 insertions, 3 deletions
diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c
index 9bdb2aab01a..e7056934c6a 100644
--- a/drivers/video/aty/mach64_ct.c
+++ b/drivers/video/aty/mach64_ct.c
@@ -206,9 +206,7 @@ static int aty_valid_pll_ct(const struct fb_info *info, u32 vclk_per, struct pll
{
u32 q;
struct atyfb_par *par = (struct atyfb_par *) info->par;
-#ifdef DEBUG
int pllvclk;
-#endif
/* FIXME: use the VTB/GTB /{3,6,12} post dividers if they're better suited */
q = par->ref_clk_per * pll->pll_ref_div * 4 / vclk_per;
@@ -223,13 +221,26 @@ static int aty_valid_pll_ct(const struct fb_info *info, u32 vclk_per, struct pll
pll->vclk_post_div_real = postdividers[pll->vclk_post_div];
// pll->vclk_post_div <<= 6;
pll->vclk_fb_div = q * pll->vclk_post_div_real / 8;
-#ifdef DEBUG
pllvclk = (1000000 * 2 * pll->vclk_fb_div) /
(par->ref_clk_per * pll->pll_ref_div);
+#ifdef DEBUG
printk("atyfb(%s): pllvclk=%d MHz, vclk=%d MHz\n",
__FUNCTION__, pllvclk, pllvclk / pll->vclk_post_div_real);
#endif
pll->pll_vclk_cntl = 0x03; /* VCLK = PLL_VCLK/VCLKx_POST */
+
+ /* Set ECP (scaler/overlay clock) divider */
+ if (par->pll_limits.ecp_max) {
+ int ecp = pllvclk / pll->vclk_post_div_real;
+ int ecp_div = 0;
+
+ while (ecp > par->pll_limits.ecp_max && ecp_div < 2) {
+ ecp >>= 1;
+ ecp_div++;
+ }
+ pll->pll_vclk_cntl |= ecp_div << 4;
+ }
+
return 0;
}