[alsa-cvslog] CVS: alsa-kernel/pci intel8x0.c,1.90,1.91

[Takashi Iwai]

Update of /cvsroot/alsa/alsa-kernel/pci
In directory sc8-pr-cvs1:/tmp/cvs-serv25770

Modified Files:
        intel8x0.c 
Log Message:
- check CIV register to sync the current index position.
  this may fix the noisy output on machines with sloppy interrupts.



Index: intel8x0.c
===================================================================
RCS file: /cvsroot/alsa/alsa-kernel/pci/intel8x0.c,v
retrieving revision 1.90
retrieving revision 1.91
diff -u -r1.90 -r1.91
--- intel8x0.c  2 Sep 2003 18:07:31 -0000       1.90
+++ intel8x0.c  5 Sep 2003 17:46:42 -0000       1.91
@@ -360,6 +360,7 @@
         int frags;
         int lvi;
         int lvi_frag;
+       int civ;
        int ack;
        int ack_reload;
        unsigned int ack_bit;
@@ -710,6 +711,7 @@
                ichdev->frags = ichdev->size / ichdev->fragsize;
        }
        iputbyte(chip, port + ICH_REG_OFF_LVI, ichdev->lvi = ICH_REG_LVI_MASK);
+       ichdev->civ = 0;
        iputbyte(chip, port + ICH_REG_OFF_CIV, 0);
        ichdev->lvi_frag = ICH_REG_LVI_MASK % ichdev->frags;
        ichdev->position = 0;
@@ -728,19 +730,39 @@
 static inline void snd_intel8x0_update(intel8x0_t *chip, ichdev_t *ichdev)
 {
        unsigned long port = ichdev->reg_offset;
+       int civ, i, step;
        int ack = 0;
 
-       ichdev->position += ichdev->fragsize1;
+       civ = igetbyte(chip, port + ICH_REG_OFF_CIV);
+       if (civ == ichdev->civ) {
+               // snd_printd("civ same %d\n", civ);
+               step = 1;
+               ichdev->civ++;
+               ichdev->civ &= ICH_REG_LVI_MASK;
+       } else {
+               step = civ - ichdev->civ;
+               if (step < 0)
+                       step += ICH_REG_LVI_MASK + 1;
+               // if (step != 1)
+               //      snd_printd("step = %d, %d -> %d\n", step, ichdev->civ, civ);
+               ichdev->civ = civ;
+       }
+
+       ichdev->position += step * ichdev->fragsize1;
        ichdev->position %= ichdev->size;
-       ichdev->lvi++;
+       ichdev->lvi += step;
        ichdev->lvi &= ICH_REG_LVI_MASK;
        iputbyte(chip, port + ICH_REG_OFF_LVI, ichdev->lvi);
-       ichdev->lvi_frag++;
-       ichdev->lvi_frag %= ichdev->frags;
-       ichdev->bdbar[ichdev->lvi * 2] = cpu_to_le32(ichdev->physbuf + 
ichdev->lvi_frag * ichdev->fragsize1);
+       for (i = 0; i < step; i++) {
+               ichdev->lvi_frag++;
+               ichdev->lvi_frag %= ichdev->frags;
+               ichdev->bdbar[ichdev->lvi * 2] = cpu_to_le32(ichdev->physbuf + 
ichdev->lvi_frag * ichdev->fragsize1);
        // printk("new: bdbar[%i] = 0x%x [0x%x], prefetch = %i, all = 0x%x, 0x%x\n", 
ichdev->lvi * 2, ichdev->bdbar[ichdev->lvi * 2], ichdev->bdbar[ichdev->lvi * 2 + 1], 
inb(ICH_REG_OFF_PIV + port), inl(port + 4), inb(port + ICH_REG_OFF_CR));
-       if ((ack = (--ichdev->ack == 0)) != 0)
-               ichdev->ack = ichdev->ack_reload;
+               if (--ichdev->ack == 0) {
+                       ichdev->ack = ichdev->ack_reload;
+                       ack = 1;
+               }
+       }
        if (ack && ichdev->substream) {
                spin_unlock(&chip->reg_lock);
                snd_pcm_period_elapsed(ichdev->substream);



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