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| author | Lior Amsalem <alior@marvell.com> | 2014-08-27 10:52:53 -0300 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2014-09-23 20:17:01 +0530 |
| commit | ba87d13721b6fe4a2479871dc4f77c5bd8db3c32 (patch) | |
| tree | cfbfdfead1eaac70a3cc9509e5339010e7ca094c /drivers/dma/mv_xor.c | |
| parent | 0e7488ed01235fdd24ce7f0295dbbea0d45311bb (diff) | |
| download | linux-ba87d13721b6fe4a2479871dc4f77c5bd8db3c32.tar.gz linux-ba87d13721b6fe4a2479871dc4f77c5bd8db3c32.tar.bz2 linux-ba87d13721b6fe4a2479871dc4f77c5bd8db3c32.zip | |
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>
Diffstat (limited to 'drivers/dma/mv_xor.c')
| -rw-r--r-- | drivers/dma/mv_xor.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/drivers/dma/mv_xor.c b/drivers/dma/mv_xor.c index 4ee5bb194fd5..cbc90e5df7ff 100644 --- a/drivers/dma/mv_xor.c +++ b/drivers/dma/mv_xor.c @@ -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--) |