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dma: mv_xor: Reduce interrupts by enabling EOD only when needed 

This commit unmasks the end-of-chain interrupt and removes the
end-of-descriptor command setting on all transactions, except those
explicitly flagged with DMA_PREP_INTERRUPT.

This allows to raise an interrupt only on chain completion, instead of
on each descriptor completion, which reduces interrupt count.

Signed-off-by: Lior Amsalem <alior@marvell.com>
Signed-off-by: Ezequiel Garcia <ezequiel.garcia@free-electrons.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Lior Amsalem 2014-08-27 10:52:53 -03:00 committed by Vinod Koul
parent 0e7488ed01
commit ba87d13721
2 changed files with 11 additions and 5 deletions
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14
drivers/dma/mv_xor.c
View File

@ -46,13 +46,16 @@ static void mv_xor_issue_pending(struct dma_chan *chan);
((chan)->dmadev.dev)
static void mv_desc_init(struct mv_xor_desc_slot *desc,
dma_addr_t addr, u32 byte_count)
dma_addr_t addr, u32 byte_count,
enum dma_ctrl_flags flags)
{
struct mv_xor_desc *hw_desc = desc->hw_desc;
hw_desc->status = XOR_DESC_DMA_OWNED;
hw_desc->phy_next_desc = 0;
hw_desc->desc_command = XOR_DESC_EOD_INT_EN;
/* Enable end-of-descriptor interrupts only for DMA_PREP_INTERRUPT */
hw_desc->desc_command = (flags & DMA_PREP_INTERRUPT) ?
XOR_DESC_EOD_INT_EN : 0;
hw_desc->phy_dest_addr = addr;
hw_desc->byte_count = byte_count;
}
@ -107,7 +110,10 @@ static u32 mv_chan_get_intr_cause(struct mv_xor_chan *chan)
static void mv_xor_device_clear_eoc_cause(struct mv_xor_chan *chan)
{
u32 val = ~(XOR_INT_END_OF_DESC << (chan->idx * 16));
u32 val;
val = XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | XOR_INT_STOPPED;
val = ~(val << (chan->idx * 16));
dev_dbg(mv_chan_to_devp(chan), "%s, val 0x%08x\n", __func__, val);
writel_relaxed(val, XOR_INTR_CAUSE(chan));
}
@ -510,7 +516,7 @@ mv_xor_prep_dma_xor(struct dma_chan *chan, dma_addr_t dest, dma_addr_t *src,
if (sw_desc) {
sw_desc->type = DMA_XOR;
sw_desc->async_tx.flags = flags;
mv_desc_init(sw_desc, dest, len);
mv_desc_init(sw_desc, dest, len, flags);
sw_desc->unmap_src_cnt = src_cnt;
sw_desc->unmap_len = len;
while (src_cnt--)

2
drivers/dma/mv_xor.h
View File

@ -67,7 +67,7 @@
XOR_INT_ERR_WRPROT | XOR_INT_ERR_OWN | \
XOR_INT_ERR_PAR | XOR_INT_ERR_MBUS)
#define XOR_INTR_MASK_VALUE (XOR_INT_END_OF_DESC | \
#define XOR_INTR_MASK_VALUE (XOR_INT_END_OF_DESC | XOR_INT_END_OF_CHAIN | \
XOR_INT_STOPPED | XOR_INTR_ERRORS)
#define WINDOW_BASE(w) (0x50 + ((w) << 2))