intelfb: make i915 modeset

This takes the modeset and pll code from my X driver.

Signed-off-by: Dave Airlie <airlied@linux.ie>

diff --git a/drivers/video/intelfb/intelfbhw.c b/drivers/video/intelfb/intelfbhw.c
index f8c8c0a..0bfa668 100644 (file)
--- a/drivers/video/intelfb/intelfbhw.c
+++ b/drivers/video/intelfb/intelfbhw.c
@@ -562,6 +562,8 @@ intelfbhw_read_hw_state(struct intelfb_info *dinfo, struct intelfb_hwstate *hw,
 
 static int calc_vclock3(int index, int m, int n, int p)
 {
+       if (p == 0 || n == 0)
+               return 0;
        return PLL_REFCLK * m / n / p;
 }
                       
@@ -570,6 +572,8 @@ static int calc_vclock(int index, int m1, int m2, int n, int p1, int p2)
        switch(index)
        {
        case PLLS_I9xx:
+               if (p1 == 0)
+                       return 0;
                return ((PLL_REFCLK * (5 * (m1 + 2) + (m2 + 2)) / (n + 2) /
                         ((p1)) * (p2 ? 10 : 5)));
        case PLLS_I8xx:
@@ -779,8 +783,20 @@ splitp(int index, unsigned int p, unsigned int *retp1, unsigned int *retp2)
 
        if (index == PLLS_I9xx)
        {
-               p1 = (p / 10) + 1;
-               p2 = 0;
+               switch (p) {
+               case 10:
+                       p1 = 2;
+                       p2 = 0;
+                       break;
+               case 20:
+                       p1 = 1;
+                       p2 = 0;
+                       break;
+               default:
+                       p1 = (p / 10) + 1;
+                       p2 = 0;
+                       break;
+               }
                
                *retp1 = (unsigned int)p1;
                *retp2 = (unsigned int)p2;
@@ -813,8 +829,8 @@ static int
 calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *retp1,
                u32 *retp2, u32 *retclock)
 {
-       u32 m1, m2, n, p1, p2, n1;
-       u32 f_vco, p, p_best = 0, m, f_out;
+       u32 m1, m2, n, p1, p2, n1, testm;
+       u32 f_vco, p, p_best = 0, m, f_out = 0;
        u32 err_max, err_target, err_best = 10000000;
        u32 n_best = 0, m_best = 0, f_best, f_err;
        u32 p_min, p_max, p_inc, div_min, div_max;
@@ -826,7 +842,10 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re
        DBG_MSG("Clock is %d\n", clock);
 
        div_max = plls[index].max_vco_freq / clock;
-       div_min = ROUND_UP_TO(plls[index].min_vco_freq, clock) / clock;
+       if (index == PLLS_I9xx)
+               div_min = 5;
+       else
+               div_min = ROUND_UP_TO(plls[index].min_vco_freq, clock) / clock;
 
        if (clock <= plls[index].p_transition_clock)
                p_inc = plls[index].p_inc_lo;
@@ -839,6 +858,16 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re
        if (p_max > plls[index].max_p)
                p_max = plls[index].max_p;
 
+       if (clock < PLL_REFCLK && index==PLLS_I9xx)
+       {
+         p_min = 10;
+         p_max = 20;
+         /* this makes 640x480 work it really shouldn't 
+            - SOMEONE WITHOUT DOCS WOZ HERE */
+         if (clock < 30000)
+           clock *= 4;
+       }
+
        DBG_MSG("p range is %d-%d (%d)\n", p_min, p_max, p_inc);
 
        p = p_min;
@@ -854,26 +883,28 @@ calc_pll_params(int index, int clock, u32 *retm1, u32 *retm2, u32 *retn, u32 *re
                do {
                        m = ROUND_UP_TO(f_vco * n, PLL_REFCLK) / PLL_REFCLK;
                        if (m < plls[index].min_m)
-                               m = plls[index].min_m;
+                               m = plls[index].min_m + 1;
                        if (m > plls[index].max_m)
-                               m = plls[index].max_m;
-                       f_out = calc_vclock3(index, m, n, p);
-                       if (splitm(index, m, &m1, &m2)) {
-                               WRN_MSG("cannot split m = %d\n", m);
-                               n++;
-                               continue;
-                       }
-                       if (clock > f_out)
-                               f_err = clock - f_out;
-                       else
-                               f_err = f_out - clock;
-
-                       if (f_err < err_best) {
-                               m_best = m;
-                               n_best = n;
-                               p_best = p;
-                               f_best = f_out;
-                               err_best = f_err;
+                               m = plls[index].max_m - 1;
+                       for (testm = m - 1; testm <= m; testm++) {
+                               f_out = calc_vclock3(index, m, n, p);
+                               if (splitm(index, m, &m1, &m2)) {
+                                       WRN_MSG("cannot split m = %d\n", m);
+                                       n++;
+                                       continue;
+                               }
+                               if (clock > f_out)
+                                       f_err = clock - f_out;
+                               else/* slightly bias the error for bigger clocks */
+                                       f_err = f_out - clock + 1;
+                               
+                               if (f_err < err_best) {
+                                       m_best = m;
+                                       n_best = n;
+                                       p_best = p;
+                                       f_best = f_out;
+                                       err_best = f_err;
+                               }
                        }
                        n++;
                } while ((n <= plls[index].max_n) && (f_out >= clock));
@@ -1157,6 +1188,7 @@ intelfbhw_program_mode(struct intelfb_info *dinfo,
        u32 hsync_reg, htotal_reg, hblank_reg;
        u32 vsync_reg, vtotal_reg, vblank_reg;
        u32 src_size_reg;
+       u32 count, tmp_val[3];
 
        /* Assume single pipe, display plane A, analog CRT. */
 
@@ -1225,6 +1257,28 @@ intelfbhw_program_mode(struct intelfb_info *dinfo,
                src_size_reg = SRC_SIZE_A;
        }
 
+       /* turn off pipe */
+       tmp = INREG(pipe_conf_reg);
+       tmp &= ~PIPECONF_ENABLE;
+       OUTREG(pipe_conf_reg, tmp);
+       
+       count = 0;
+       do{
+         tmp_val[count%3] = INREG(0x70000);
+         if ((tmp_val[0] == tmp_val[1]) && (tmp_val[1]==tmp_val[2]))
+           break;
+         count++;
+         udelay(1);
+         if (count % 200 == 0)
+         {
+           tmp = INREG(pipe_conf_reg);
+           tmp &= ~PIPECONF_ENABLE;
+           OUTREG(pipe_conf_reg, tmp);
+         }
+       } while(count < 2000);
+
+       OUTREG(ADPA, INREG(ADPA) & ~ADPA_DAC_ENABLE);
+
        /* Disable planes A and B. */
        tmp = INREG(DSPACNTR);
        tmp &= ~DISPPLANE_PLANE_ENABLE;
@@ -1242,10 +1296,8 @@ intelfbhw_program_mode(struct intelfb_info *dinfo,
        tmp |= ADPA_DPMS_D3;
        OUTREG(ADPA, tmp);
 
-       /* turn off pipe */
-       tmp = INREG(pipe_conf_reg);
-       tmp &= ~PIPECONF_ENABLE;
-       OUTREG(pipe_conf_reg, tmp);
+       /* do some funky magic - xyzzy */
+       OUTREG(0x61204, 0xabcd0000);
 
        /* turn off PLL */
        tmp = INREG(dpll_reg);
@@ -1257,26 +1309,30 @@ intelfbhw_program_mode(struct intelfb_info *dinfo,
        OUTREG(fp0_reg, *fp0);
        OUTREG(fp1_reg, *fp1);
 
-       /* Set pipe parameters */
-       OUTREG(hsync_reg, *hs);
-       OUTREG(hblank_reg, *hb);
-       OUTREG(htotal_reg, *ht);
-       OUTREG(vsync_reg, *vs);
-       OUTREG(vblank_reg, *vb);
-       OUTREG(vtotal_reg, *vt);
-       OUTREG(src_size_reg, *ss);
+       /* Enable PLL */
+       tmp = INREG(dpll_reg);
+       tmp |= DPLL_VCO_ENABLE;
+       OUTREG(dpll_reg, tmp);
 
        /* Set DVOs B/C */
        OUTREG(DVOB, hw->dvob);
        OUTREG(DVOC, hw->dvoc);
 
+       /* undo funky magic */
+       OUTREG(0x61204, 0x00000000);
+
        /* Set ADPA */
+       OUTREG(ADPA, INREG(ADPA) | ADPA_DAC_ENABLE);
        OUTREG(ADPA, (hw->adpa & ~(ADPA_DPMS_CONTROL_MASK)) | ADPA_DPMS_D3);
 
-       /* Enable PLL */
-       tmp = INREG(dpll_reg);
-       tmp |= DPLL_VCO_ENABLE;
-       OUTREG(dpll_reg, tmp);
+       /* Set pipe parameters */
+       OUTREG(hsync_reg, *hs);
+       OUTREG(hblank_reg, *hb);
+       OUTREG(htotal_reg, *ht);
+       OUTREG(vsync_reg, *vs);
+       OUTREG(vblank_reg, *vb);
+       OUTREG(vtotal_reg, *vt);
+       OUTREG(src_size_reg, *ss);
 
        /* Enable pipe */
        OUTREG(pipe_conf_reg, *pipe_conf | PIPECONF_ENABLE);