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FIFOEMP can lag LAST_SEG_DONE in the Ultra2 and U160

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hardware.  Wait a few extra clocks for FIFOEMP to assert
before calling an overrun.

Approved by: RE
This commit is contained in:
gibbs 2003-05-26 21:24:55 +00:00
parent 0174a01551
commit 25cd8a01cf
1 changed files with 10 additions and 2 deletions
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12
sys/dev/aic7xxx/aic7xxx.seq
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@ -40,7 +40,7 @@
* $FreeBSD$
*/
VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.seq#55 $"
VERSION = "$Id: //depot/aic7xxx/aic7xxx/aic7xxx.seq#56 $"
PATCH_ARG_LIST = "struct ahc_softc *ahc"
PREFIX = "ahc_"
@ -1044,11 +1044,19 @@ ultra2_fifoflush:
* LAST_SEG_DONE to come true on a completed transfer
* and then test to see if the data FIFO is non-empty.
*/
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL jz . + 4;
test SCB_RESIDUAL_SGPTR[0], SG_LIST_NULL
jz ultra2_wait_fifoemp;
test SG_CACHE_SHADOW, LAST_SEG_DONE jz .;
/*
* FIFOEMP can lag LAST_SEG_DONE. Wait a few
* clocks before calling this an overrun.
*/
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
test DFSTATUS, FIFOEMP jnz ultra2_fifoempty;
/* Overrun */
jmp data_phase_loop;
ultra2_wait_fifoemp:
test DFSTATUS, FIFOEMP jz .;
}
ultra2_fifoempty: