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Merge branch 'topic/sh' into for-linus

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This commit is contained in:
Vinod Koul 2016-07-16 20:10:17 +05:30
commit 9c4d7e6481
1 changed files with 37 additions and 4 deletions
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41
drivers/dma/sh/rcar-dmac.c
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@ -311,7 +311,7 @@ static bool rcar_dmac_chan_is_busy(struct rcar_dmac_chan *chan)
{
u32 chcr = rcar_dmac_chan_read(chan, RCAR_DMACHCR);
return (chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE)) == RCAR_DMACHCR_DE;
return !!(chcr & (RCAR_DMACHCR_DE | RCAR_DMACHCR_TE));
}
static void rcar_dmac_chan_start_xfer(struct rcar_dmac_chan *chan)
@ -510,7 +510,7 @@ static void rcar_dmac_desc_put(struct rcar_dmac_chan *chan,
spin_lock_irqsave(&chan->lock, flags);
list_splice_tail_init(&desc->chunks, &chan->desc.chunks_free);
list_add_tail(&desc->node, &chan->desc.free);
list_add(&desc->node, &chan->desc.free);
spin_unlock_irqrestore(&chan->lock, flags);
}
@ -990,6 +990,8 @@ static void rcar_dmac_free_chan_resources(struct dma_chan *chan)
list_splice_init(&rchan->desc.done, &list);
list_splice_init(&rchan->desc.wait, &list);
rchan->desc.running = NULL;
list_for_each_entry(desc, &list, node)
rcar_dmac_realloc_hwdesc(rchan, desc, 0);
@ -1143,19 +1145,46 @@ static unsigned int rcar_dmac_chan_get_residue(struct rcar_dmac_chan *chan,
struct rcar_dmac_desc *desc = chan->desc.running;
struct rcar_dmac_xfer_chunk *running = NULL;
struct rcar_dmac_xfer_chunk *chunk;
enum dma_status status;
unsigned int residue = 0;
unsigned int dptr = 0;
if (!desc)
return 0;
/*
* If the cookie corresponds to a descriptor that has been completed
* there is no residue. The same check has already been performed by the
* caller but without holding the channel lock, so the descriptor could
* now be complete.
*/
status = dma_cookie_status(&chan->chan, cookie, NULL);
if (status == DMA_COMPLETE)
return 0;
/*
* If the cookie doesn't correspond to the currently running transfer
* then the descriptor hasn't been processed yet, and the residue is
* equal to the full descriptor size.
*/
if (cookie != desc->async_tx.cookie)
return desc->size;
if (cookie != desc->async_tx.cookie) {
list_for_each_entry(desc, &chan->desc.pending, node) {
if (cookie == desc->async_tx.cookie)
return desc->size;
}
list_for_each_entry(desc, &chan->desc.active, node) {
if (cookie == desc->async_tx.cookie)
return desc->size;
}
/*
* No descriptor found for the cookie, there's thus no residue.
* This shouldn't happen if the calling driver passes a correct
* cookie value.
*/
WARN(1, "No descriptor for cookie!");
return 0;
}
/*
* In descriptor mode the descriptor running pointer is not maintained
@ -1202,6 +1231,10 @@ static enum dma_status rcar_dmac_tx_status(struct dma_chan *chan,
residue = rcar_dmac_chan_get_residue(rchan, cookie);
spin_unlock_irqrestore(&rchan->lock, flags);
/* if there's no residue, the cookie is complete */
if (!residue)
return DMA_COMPLETE;
dma_set_residue(txstate, residue);
return status;