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Maciej,
Thanks for the fix, it's working for me (in pre-2.1.101-1)
but it is probably not good for everyone. Your patch reverses
the change done in linux-2.1.102.
The CVS comment for this change is:
revision 1.19
date: 1998/04/29 22:29:42; author: alan; state: Exp; lines: +3 -3
MAD16 fixes I hope. Looks like there might be mutually incompatible
variants of the Opti chips
Looking at the docs, bit 2 of MC4 reversed its meaning between
the C930 and the C931.
Alan,
Can you verify that the change was done for the C930?
In that case, my patch should cover both cases (I tried it only
with the C931).
--
Itai Nahshon nahshon@actcom.co.il
Also nahshon@vnet.ibm.com
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--- mad16.c.ORIG Sun May 31 05:49:24 1998
+++ mad16.c Sun May 31 05:49:40 1998
@@ -405,13 +405,17 @@
/* MC2 is CD configuration. Don't touch it. */
mad_write(MC3_PORT, 0); /* Disable SB mode IRQ and DMA */
+
+ /* bit 2 of MC4 reverses it's meaning between the C930
+ and the C931. */
+ cfg = c931_detected ? 0x04 : 0x00;
#ifdef MAD16_CDSEL
if(MAD16_CDSEL & 0x20)
- mad_write(MC4_PORT, 0x62); /* opl4 */
+ mad_write(MC4_PORT, 0x62|cfg); /* opl4 */
else
- mad_write(MC4_PORT, 0x52); /* opl3 */
+ mad_write(MC4_PORT, 0x52|cfg); /* opl3 */
#else
- mad_write(MC4_PORT, 0x52);
+ mad_write(MC4_PORT, 0x52|cfg);
#endif
mad_write(MC5_PORT, 0x3C); /* Init it into mode2 */
mad_write(MC6_PORT, 0x02); /* Enable WSS, Disable MPU and SB */
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