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dma : EG20T PCH: Fix miss-setting DMA descriptor 

Currently, in case of using scatter/gather mode, head of data is not sent to

destination. The cause is second descriptor address is set to NEXT.

The NEXT must have head of descriptor address.

This patch sets head of descriptor address to the NEXT.

Acked-by: Yong Wang <youg.y.wang@intel.com>
Signed-off-by: Tomoya MORINAGA <tomoya-linux@dsn.okisemi.com>
[dan.j.williams@intel.com: fixed up usage of virt_to_phys()]
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Tomoya MORINAGA 2010-12-01 19:49:48 +09:00 committed by Dan Williams
parent cf2f9c5980
commit 943d8d8bca
1 changed files with 8 additions and 7 deletions
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15
drivers/dma/pch_dma.c
View File

@ -259,11 +259,6 @@ static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
return;
}
channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
channel_writel(pd_chan, SIZE, desc->regs.size);
channel_writel(pd_chan, NEXT, desc->regs.next);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> dev_addr: %x\n",
pd_chan->chan.chan_id, desc->regs.dev_addr);
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> mem_addr: %x\n",
@ -273,10 +268,16 @@ static void pdc_dostart(struct pch_dma_chan *pd_chan, struct pch_dma_desc* desc)
dev_dbg(chan2dev(&pd_chan->chan), "chan %d -> next: %x\n",
pd_chan->chan.chan_id, desc->regs.next);
if (list_empty(&desc->tx_list))
if (list_empty(&desc->tx_list)) {
channel_writel(pd_chan, DEV_ADDR, desc->regs.dev_addr);
channel_writel(pd_chan, MEM_ADDR, desc->regs.mem_addr);
channel_writel(pd_chan, SIZE, desc->regs.size);
channel_writel(pd_chan, NEXT, desc->regs.next);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_ONESHOT);
else
} else {
channel_writel(pd_chan, NEXT, desc->txd.phys);
pdc_set_mode(&pd_chan->chan, DMA_CTL0_SG);
}
val = dma_readl(pd, CTL2);
val |= 1 << (DMA_CTL2_START_SHIFT_BITS + pd_chan->chan.chan_id);