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dma : EG20T PCH: Fix miss-setting DMA descriptor

Sfoglia il codice sorgente 
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
committato da Dan Williams
parent cf2f9c5980
commit 943d8d8bca
1 ha cambiato i file con 8 aggiunte e 7 eliminazioni
Scarica il file Patch Scarica il file Diff Expand all files Collapse all files

15
drivers/dma/pch_dma.c
Vedi 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);