[Arm-netbook] ALSA info - trying to get sound working
elendil at planet.nl
Fri Mar 26 00:28:11 GMT 2010
On Thursday 25 March 2010, Luke Kenneth Casson Leighton wrote:
> code goes something like this:
Looks like you're onto something here.
> R4 = s3c6410_ac97_read(NULL, 4);
#define AC97_HEADPHONE 0x04 /* Headphone Volume (optional) */
And headphone volume is the one of the alsa controls that does something.
> R5 = s3c6410_ac97_read(NULL, 0x18);
#define AC97_PCM 0x18 /* PCM Volume */
> R2 = R4 << 17;
> R2 >>= 17;
What's this? Rounding off?
> s3c6410_ac97_write(NULL, 4, R2);
> R2 = R5 << 17;
> R2 >>= 17;
> s3c6410_ac97_write(NULL, 0x18, R2);
> it looks like the same in s3c24xx_pcm_close, except that it's <<19
> and >>= 19 for the 2nd one, hard to tell with the assembler being 0x75
> 0x20 0xff 0xe6 not properly disassembled.
> in open, those two bug-ugly calls are made _after_ the
Could you translate this to a proper patch? I'd prefer if you do it as you
can see the correct sequence of things.
Attached the patch I have ATM.
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