From: Krzysztof Helt krzysztof.h1@wp.pl

This patch adds support for a wavetable chip on the BTC 1817DW board. The QS1000 is connected through the digital input to the Opti931 chip.

Signed-off-by: Krzysztof Helt krzysztof.h1@wp.pl

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This is not a hot-fix and can be postponed after 1.0.15 (before Takashi asks).

A cornerstone of this patch is to set the auto-source selection for the FM DAC. This way it does not affects boards using the FM OPL synthesizers which do not use the digital input. If any other wavetable is connected to the opti chip through the digital input, the format setting (MC_REG(21)) should be revised if it is correct for the new board. However, in the whole opti92x-ad1848 this register was never touched (so probably nobody ever used the digital input ).

Regards, Krzysztof

diff -urp linux-ref/sound/isa/opti9xx/opti92x-ad1848.c linux-2.6.23/sound/isa/opti9xx/opti92x-ad1848.c --- linux-ref/sound/isa/opti9xx/opti92x-ad1848.c 2007-09-12 13:33:51.000000000 +0200 +++ linux-2.6.23/sound/isa/opti9xx/opti92x-ad1848.c 2007-09-19 22:13:02.000000000 +0200 @@ -501,6 +501,16 @@ static int __devinit snd_opti9xx_configu (chip->hardware == OPTi9XX_HW_82C930 ? 0x00 : 0x04), 0x34); snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(5), 0x20, 0xbf); + /* + * The BTC 1817DW has QS1000 wavetable which is connected + * to the serial digital input of the OPTI931. + */ + snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(21), 0x82, 0xff); + /* + * This bit sets OPTI931 to automaticaly select FM + * or digital input signal. + */ + snd_opti9xx_write_mask(chip, OPTi9XX_MC_REG(26), 0x01, 0x01); break; #endif /* OPTi93X */

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