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Fix the size of the playback buffer. Patch from Dave Sainty <dave@dtsp.co.nz>.

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cjs 2000-01-18 04:48:47 +00:00
parent 9efabde18b
commit 762741c71d
1 changed files with 9 additions and 8 deletions
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17
sys/dev/pci/eso.c
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@ -1,4 +1,4 @@
/* $NetBSD: eso.c,v 1.16 1999/12/28 19:26:26 kleink Exp $ */
/* $NetBSD: eso.c,v 1.17 2000/01/18 04:48:47 cjs Exp $ */
/*
* Copyright (c) 1999 Klaus J. Klein
@ -1580,15 +1580,16 @@ eso_round_buffersize(hdl, direction, bufsize)
size_t maxsize;
/*
* The playback DMA buffer size on the Solo-1 is limited to 2^16 -
* 1 bytes. This is because A2DMAC is a two byte value indicating
* the literal byte count, and zero does not appear to be used as
* a special case for 2^16.
* The playback DMA buffer size on the Solo-1 is limited to 0xfff0
* bytes. This is because IO_A2DMAC is a two byte value
* indicating the literal byte count, and the 4 least significant
* bits are read-only. Zero is not used as a special case for
* 0x10000.
*
* For recording, DMAC_DMAC is the byte count - 1, so 2^16 can be
* represented.
* For recording, DMAC_DMAC is the byte count - 1, so 0x10000 can
* be represented.
*/
maxsize = (direction == AUMODE_PLAY) ? 65535 : 65536;
maxsize = (direction == AUMODE_PLAY) ? 0xfff0 : 0x10000;
if (bufsize > maxsize)
bufsize = maxsize;