On Wed, Jul 16, 2003 at 08:22:52PM +0200, Adrian Bunk wrote:
> On Tue, Jul 15, 2003 at 10:47:32PM +0000, Adam Belay wrote:
> > Could I see the output for 01:01.00/options and 01:01.00/resources also,
> > perhaps it will provide some insight. I'm guessing the resources may be
> > incorrect in that node.
>
> It's below, this using with 2.6.0-test1 (same dmesg output):
>
> <-- snip -->
>
> # cat /sys/bus/pnp/devices/01\:01.01/resources
> state = active
> io 0x330-0x331
> irq 9
> # cat /sys/bus/pnp/devices/01\:01.01/options
> Dependent: 01 - Priority preferred
> port 0x330-0x330, align 0xf, size 0x2, 16-bit address decoding
> irq 2/9 High-Edge
> Dependent: 02 - Priority acceptable
> port 0x300-0x330, align 0xf, size 0x2, 16-bit address decoding
> irq 2/9 High-Edge
> Dependent: 03 - Priority functional
> port 0x300-0x330, align 0xf, size 0x2, 16-bit address decoding
> irq 2/9,10,11,15 High-Edge
> # cat /sys/bus/pnp/devices/01\:01.00/resources
> state = active
> io 0x220-0x22f
> io 0x388-0x38b
> io 0x500-0x50f
> irq 5
> dma 1
> dma disabled
> # cat /sys/bus/pnp/devices/01\:01.00/options
> Dependent: 01 - Priority preferred
> port 0x220-0x220, align 0x1f, size 0x10, 16-bit address decoding
> port 0x388-0x388, align 0x7, size 0x4, 16-bit address decoding
> port 0x530-0x530, align 0x7, size 0x10, 16-bit address decoding
> irq 5 High-Edge
> dma 1 8-bit byte-count type-A
> dma 3 8-bit byte-count type-A
> Dependent: 02 - Priority acceptable
> port 0x220-0x240, align 0x1f, size 0x10, 16-bit address decoding
> port 0x388-0x388, align 0x7, size 0x4, 16-bit address decoding
> port 0x530-0x530, align 0xf, size 0x10, 16-bit address decoding
> irq 5,7 High-Edge
> dma 0,1,3 8-bit byte-count type-A
> dma 0,1,3 8-bit byte-count type-A
> Dependent: 03 - Priority functional
> port 0x220-0x280, align 0x1f, size 0x10, 16-bit address decoding
> port 0x388-0x3b8, align 0x7, size 0x4, 16-bit address decoding
> port 0x500-0x560, align 0xf, size 0x10, 16-bit address decoding
> irq 5,7,10 High-Edge
> dma 0,1,3 8-bit byte-count type-A
> dma 0,1,3 8-bit byte-count type-A
> Dependent: 04 - Priority functional
> port 0x220-0x280, align 0x1f, size 0x10, 16-bit address decoding
> port 0x388-0x3b8, align 0x7, size 0x4, 16-bit address decoding
> port 0x500-0x620, align 0xf, size 0x10, 16-bit address decoding
> irq 5,7,10,11 High-Edge
> dma 0,1,3 8-bit byte-count type-A
> dma <none> 8-bit byte-count type-A
> Dependent: 05 - Priority functional
> port 0x220-0x280, align 0x1f, size 0x10, 16-bit address decoding
> port 0x388-0x3b8, align 0x7, size 0x4, 16-bit address decoding
> port 0x500-0x620, align 0xf, size 0x10, 16-bit address decoding
> irq 5,7,2/9,10,11,15 High-Edge
> dma 0,1,3 8-bit byte-count type-A
> dma <none> 8-bit byte-count type-A
> #
>
> <-- snip -->
>
> > Thanks,
> > Adam
>
> cu
> Adrian
>
Hi Adrian,
Thanks for the information, I think I have a good idea of whats going here.
Notice the disabled dma in node 01:01.00. The alsa code appears to not be
able to handle a disabled dma for this device. The offending code is
probably here:
sound/isa/ad1816a/ad1816a_lib.c - line 609 - function snd_ad1816a_create
if (request_dma(dma2, "AD1816A - 2")) {
snd_ad1816a_free(chip);
return -EBUSY;
}
chip->dma2 = dma2;
The value of disabled dma2 is -1. Therefore the request_dma fails because
of this code:
int request_dma(unsigned int dmanr, const char * device_id)
{
if (dmanr >= MAX_DMA_CHANNELS)
return -EINVAL;
if (xchg(&dma_chan_busy[dmanr].lock, 1) != 0)
return -EBUSY;
dma_chan_busy[dmanr].device_id = device_id;
/* old flag was 0, now contains 1 to indicate busy */
return 0;
} /* request_dma */
Because it is unsigned long it requests dma 0xffff which is greater than
MAX_DMA_CHANNELS and therefore the function returns -EINVAL.
So I'd imagine we could fix the driver to support this... Jaroslav, any
comments? Perhaps we could use pnp_dma_valid? Also it would be nice to
add a printk that will display if snd_ad1816a_create fails.
There is one question unanswered however, why is pnp picking the resource
option 4 or possibly 5 (assigning a blank dma). Its almost as if dma 3 is
in use?
Could I see the following?
1.) the output of /proc/dma
2.) the output of
# cd /sys/bus/pnp/devices
# find */resources | xargs cat | grep dma
3.) the output of
# cd /sys/bus/pnp/devices
# find */resources | xargs cat | grep io
Also there is a kernel parameter to allow dma 0. It is 'allowdma0' and
I predict the extra dma will get the sound card working.
Thanks,
Adam
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