[PATCH] atyfb: Improve power management

[pandora-kernel.git] / drivers / video / aty / mach64_ct.c

diff --git a/drivers/video/aty/mach64_ct.c b/drivers/video/aty/mach64_ct.c
index 10232cc..f3b487b 100644 (file)
--- a/drivers/video/aty/mach64_ct.c
+++ b/drivers/video/aty/mach64_ct.c
@@ -398,8 +398,8 @@ static int __devinit aty_init_pll_ct(const struct fb_info *info,
                                     union aty_pll *pll)
 {
        struct atyfb_par *par = (struct atyfb_par *) info->par;
-       u8 mpost_div, xpost_div, sclk_post_div_real, sclk_fb_div, spll_cntl2;
-       u32 q, i, memcntl, trp;
+       u8 mpost_div, xpost_div, sclk_post_div_real;
+       u32 q, memcntl, trp;
        u32 dsp_config, dsp_on_off, vga_dsp_config, vga_dsp_on_off;
 #ifdef DEBUG
        int pllmclk, pllsclk;
@@ -575,14 +575,30 @@ static int __devinit aty_init_pll_ct(const struct fb_info *info,
                        mpost_div += (q <  32*8);
                }
                sclk_post_div_real = postdividers[mpost_div];
-               sclk_fb_div = q * sclk_post_div_real / 8;
-               spll_cntl2 = mpost_div << 4;
+               pll->ct.sclk_fb_div = q * sclk_post_div_real / 8;
+               pll->ct.spll_cntl2 = mpost_div << 4;
 #ifdef DEBUG
-               pllsclk = (1000000 * 2 * sclk_fb_div) /
+               pllsclk = (1000000 * 2 * pll->ct.sclk_fb_div) /
                        (par->ref_clk_per * pll->ct.pll_ref_div);
                printk("atyfb(%s): use sclk, pllsclk=%d MHz, sclk=mclk=%d MHz\n",
                        __FUNCTION__, pllsclk, pllsclk / sclk_post_div_real);
 #endif
+       }
+
+       /* Disable the extra precision pixel clock controls since we do not use them. */
+       pll->ct.ext_vpll_cntl = aty_ld_pll_ct(EXT_VPLL_CNTL, par);
+       pll->ct.ext_vpll_cntl &= ~(EXT_VPLL_EN | EXT_VPLL_VGA_EN | EXT_VPLL_INSYNC);
+
+       return 0;
+}
+
+static void aty_resume_pll_ct(const struct fb_info *info,
+                             union aty_pll *pll)
+{
+       struct atyfb_par *par = info->par;
+
+       if (par->mclk_per != par->xclk_per) {
+               int i;
                /*
                * This disables the sclk, crashes the computer as reported:
                * aty_st_pll_ct(SPLL_CNTL2, 3, info);
@@ -590,8 +606,8 @@ static int __devinit aty_init_pll_ct(const struct fb_info *info,
                * So it seems the sclk must be enabled before it is used;
                * so PLL_GEN_CNTL must be programmed *after* the sclk.
                */
-               aty_st_pll_ct(SCLK_FB_DIV, sclk_fb_div, par);
-               aty_st_pll_ct(SPLL_CNTL2, spll_cntl2, par);
+               aty_st_pll_ct(SCLK_FB_DIV, pll->ct.sclk_fb_div, par);
+               aty_st_pll_ct(SPLL_CNTL2, pll->ct.spll_cntl2, par);
                /*
                 * The sclk has been started. However, I believe the first clock
                 * ticks it generates are not very stable. Hope this primitive loop
@@ -605,11 +621,7 @@ static int __devinit aty_init_pll_ct(const struct fb_info *info,
        aty_st_pll_ct(PLL_GEN_CNTL, pll->ct.pll_gen_cntl, par);
        aty_st_pll_ct(MCLK_FB_DIV, pll->ct.mclk_fb_div, par);
        aty_st_pll_ct(PLL_EXT_CNTL, pll->ct.pll_ext_cntl, par);
-       /* Disable the extra precision pixel clock controls since we do not use them. */
-       aty_st_pll_ct(EXT_VPLL_CNTL, aty_ld_pll_ct(EXT_VPLL_CNTL, par) &
-               ~(EXT_VPLL_EN | EXT_VPLL_VGA_EN | EXT_VPLL_INSYNC), par);
-
-       return 0;
+       aty_st_pll_ct(EXT_VPLL_CNTL, pll->ct.ext_vpll_cntl, par);
 }
 
 static int dummy(void)
@@ -626,5 +638,6 @@ const struct aty_pll_ops aty_pll_ct = {
        .pll_to_var     = aty_pll_to_var_ct,
        .set_pll        = aty_set_pll_ct,
        .get_pll        = aty_get_pll_ct,
-       .init_pll       = aty_init_pll_ct
+       .init_pll       = aty_init_pll_ct,
+       .resume_pll     = aty_resume_pll_ct,
 };