[PATCH] Dreamcast DMA fix

[Adrian M. <ad...@ne...>]

I am pretty sure this is the correct patch to fix the issues with the
pvr2 dma, however, as the pvr2 will not start for seemingly entirely
different reasons (see http://lkml.org/lkml/2007/7/22/177), I am a bit
stuck atm.

The patch correctly assigns vchans and also keeps a record of the first
vchan for each DMAC, allowing subsequent matching of vchans against
DMAC.

Signed-off by: Adrian McMenamin <ad...@mc...>

diff --git a/arch/sh/drivers/dma/dma-api.c
b/arch/sh/drivers/dma/dma-api.c
index cf8e119..76ed816 100644
--- a/arch/sh/drivers/dma/dma-api.c
+++ b/arch/sh/drivers/dma/dma-api.c
@@ -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];
 
diff --git a/include/asm-sh/dma.h b/include/asm-sh/dma.h
index 6034d4a..4c75b70 100644
--- a/include/asm-sh/dma.h
+++ b/include/asm-sh/dma.h
@@ -111,6 +111,7 @@ struct dma_info {
 
        struct list_head list;
        int first_channel_nr;
+       int first_vchannel_nr;
 };
 
 struct dma_chan_caps {