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sh: Fix Dreamcast DMA issues.

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The current SH DMA API is somewhat broken, not correctly matching
virtual channel to the correct SH DMAC. This wasn't noticeable when
using g2 DMA for the sound driver - one channel 0 is as good as any
other! - but caused the pvr2 driver to fail.

This patch fixes the pvr2 problem and consequently fixes the sound
driver to ensure it continues to function.

Signed-off by: Adrian McMenamin <adrian@mcmen.demon.co.uk>
Signed-off-by: Paul Mundt <lethal@linux-sh.org>
This commit is contained in:
Adrian McMenamin 2007-07-24 13:30:55 +09:00 committed by Paul Mundt
parent 8cf1a74305
commit eb695dbf00
3 changed files with 6 additions and 4 deletions
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7
arch/sh/drivers/dma/dma-api.c
View File

@ -31,8 +31,8 @@ struct dma_info *get_dma_info(unsigned int chan)
* the channel is.
*/
list_for_each_entry(info, &registered_dmac_list, list) {
if ((chan < info->first_channel_nr) ||
(chan >= info->first_channel_nr + info->nr_channels))
if ((chan < info->first_vchannel_nr) ||
(chan >= info->first_vchannel_nr + info->nr_channels))
continue;
return info;
@ -82,7 +82,7 @@ struct dma_channel *get_dma_channel(unsigned int chan)
for (i = 0; i < info->nr_channels; i++) {
channel = &info->channels[i];
if (channel->chan == chan)
if (channel->vchan == chan)
return channel;
}
@ -369,6 +369,7 @@ int register_dmac(struct dma_info *info)
}
total_channels = get_nr_channels();
info->first_vchannel_nr = total_channels;
for (i = 0; i < info->nr_channels; i++) {
struct dma_channel *chan = &info->channels[i];

1
include/asm-sh/dma.h
View File

@ -111,6 +111,7 @@ struct dma_info {
struct list_head list;
int first_channel_nr;
int first_vchannel_nr;
};
struct dma_chan_caps {

2
sound/sh/aica.h
View File

@ -52,7 +52,7 @@
#define AICA_CHANNEL1_OFFSET 0x21000
#define CHANNEL_OFFSET 0x10000
#define AICA_DMA_CHANNEL 0
#define AICA_DMA_CHANNEL 5
#define AICA_DMA_MODE 5
#define SND_AICA_DRIVER "AICA"