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| author | Andy Shevchenko <andriy.shevchenko@linux.intel.com> | 2015-11-17 18:00:30 +0200 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-12-05 14:00:34 +0530 |
| commit | f0579c8ceaf18adf1eca8b4404f9caac37208655 (patch) | |
| tree | 9b8908cb2e7a97fa7409cc7dbf32a93ecc094a52 /drivers/dma/hsu/hsu.c | |
| parent | f94cf9f4c54a72ccbd2078bb0cedd3691a71c431 (diff) | |
| download | linux-f0579c8ceaf18adf1eca8b4404f9caac37208655.tar.bz2 | |
dmaengine: hsu: speed up residue calculation
There is no need to calculate an overall length of the descriptor each time we
call for DMA transfer status. Instead we do this at descriptor allocation stage
and keep the stored length for further usage.
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma/hsu/hsu.c')
| -rw-r--r-- | drivers/dma/hsu/hsu.c | 17 |
1 files changed, 4 insertions, 13 deletions
diff --git a/drivers/dma/hsu/hsu.c b/drivers/dma/hsu/hsu.c index 823ad728aecf..eef145edb936 100644 --- a/drivers/dma/hsu/hsu.c +++ b/drivers/dma/hsu/hsu.c @@ -228,6 +228,8 @@ static struct dma_async_tx_descriptor *hsu_dma_prep_slave_sg( for_each_sg(sgl, sg, sg_len, i) { desc->sg[i].addr = sg_dma_address(sg); desc->sg[i].len = sg_dma_len(sg); + + desc->length += sg_dma_len(sg); } desc->nents = sg_len; @@ -249,21 +251,10 @@ static void hsu_dma_issue_pending(struct dma_chan *chan) spin_unlock_irqrestore(&hsuc->vchan.lock, flags); } -static size_t hsu_dma_desc_size(struct hsu_dma_desc *desc) -{ - size_t bytes = 0; - unsigned int i; - - for (i = desc->active; i < desc->nents; i++) - bytes += desc->sg[i].len; - - return bytes; -} - static size_t hsu_dma_active_desc_size(struct hsu_dma_chan *hsuc) { struct hsu_dma_desc *desc = hsuc->desc; - size_t bytes = hsu_dma_desc_size(desc); + size_t bytes = desc->length; int i; i = desc->active % HSU_DMA_CHAN_NR_DESC; @@ -294,7 +285,7 @@ static enum dma_status hsu_dma_tx_status(struct dma_chan *chan, dma_set_residue(state, bytes); status = hsuc->desc->status; } else if (vdesc) { - bytes = hsu_dma_desc_size(to_hsu_dma_desc(vdesc)); + bytes = to_hsu_dma_desc(vdesc)->length; dma_set_residue(state, bytes); } spin_unlock_irqrestore(&hsuc->vchan.lock, flags); |