Donate to e Foundation | Murena handsets with /e/OS | Own a part of Murena! Learn more

Commit f0579c8c authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

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: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent f94cf9f4

drivers/dma/hsu/hsu.c

+4 −13
Original line number Diff line number Diff line
@@ -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);

drivers/dma/hsu/hsu.h

+1 −0
Original line number Diff line number Diff line
@@ -65,6 +65,7 @@ struct hsu_dma_desc { 
	enum dma_transfer_direction direction;

	struct hsu_dma_sg *sg;

	unsigned int nents;

	size_t length;

	unsigned int active;

	enum dma_status status;

};