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Commit 52c87179 authored by Jean-Francois Moine's avatar Jean-Francois Moine Committed by Vinod Koul
Browse files

dmaengine: sun6i: Simplify lli setting 



Checking the DMA config before setting the lli list avoids to do tests
inside the setting loop.

Signed-off-by: default avatarJean-Francois Moine <moinejf@free.fr>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent dc6a58c1

drivers/dma/sun6i-dma.c

+47 −55
Original line number Diff line number Diff line
@@ -276,45 +276,6 @@ static void *sun6i_dma_lli_add(struct sun6i_dma_lli *prev, 
	return next;

}



static inline int sun6i_dma_cfg_lli(struct sun6i_dma_lli *lli,

				    dma_addr_t src,

				    dma_addr_t dst, u32 len,

				    struct dma_slave_config *config)

{

	s8 src_width, dst_width, src_burst, dst_burst;



	if (!config)

		return -EINVAL;



	src_burst = convert_burst(config->src_maxburst);

	if (src_burst < 0)

		return src_burst;



	dst_burst = convert_burst(config->dst_maxburst);

	if (dst_burst < 0)

		return dst_burst;



	src_width = convert_buswidth(config->src_addr_width);

	if (src_width < 0)

		return src_width;



	dst_width = convert_buswidth(config->dst_addr_width);

	if (dst_width < 0)

		return dst_width;



	lli->cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |

		DMA_CHAN_CFG_SRC_WIDTH(src_width) |

		DMA_CHAN_CFG_DST_BURST(dst_burst) |

		DMA_CHAN_CFG_DST_WIDTH(dst_width);



	lli->src = src;

	lli->dst = dst;

	lli->len = len;

	lli->para = NORMAL_WAIT;



	return 0;

}



static inline void sun6i_dma_dump_lli(struct sun6i_vchan *vchan,

				      struct sun6i_dma_lli *lli)

{
@@ -502,6 +463,35 @@ static irqreturn_t sun6i_dma_interrupt(int irq, void *dev_id) 
	return ret;

}



static int set_config(struct sun6i_dma_dev *sdev,

			struct dma_slave_config *sconfig,

			enum dma_transfer_direction direction,

			u32 *p_cfg)

{

	s8 src_width, dst_width, src_burst, dst_burst;



	src_burst = convert_burst(sconfig->src_maxburst);

	src_width = convert_buswidth(sconfig->src_addr_width);

	dst_burst = convert_burst(sconfig->dst_maxburst);

	dst_width = convert_buswidth(sconfig->dst_addr_width);



	if (src_burst < 0)

		return src_burst;

	if (src_width < 0)

		return src_width;

	if (dst_burst < 0)

		return dst_burst;

	if (dst_width < 0)

		return dst_width;



	*p_cfg = DMA_CHAN_CFG_SRC_BURST(src_burst) |

		DMA_CHAN_CFG_SRC_WIDTH(src_width) |

		DMA_CHAN_CFG_DST_BURST(dst_burst) |

		DMA_CHAN_CFG_DST_WIDTH(dst_width);



	return 0;

}



static struct dma_async_tx_descriptor *sun6i_dma_prep_dma_memcpy(

		struct dma_chan *chan, dma_addr_t dest, dma_addr_t src,

		size_t len, unsigned long flags)
@@ -569,6 +559,7 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( 
	struct sun6i_desc *txd;

	struct scatterlist *sg;

	dma_addr_t p_lli;

	u32 lli_cfg;

	int i, ret;



	if (!sgl)
@@ -579,6 +570,12 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( 
		return NULL;

	}



	ret = set_config(sdev, sconfig, dir, &lli_cfg);

	if (ret) {

		dev_err(chan2dev(chan), "Invalid DMA configuration\n");

		return NULL;

	}



	txd = kzalloc(sizeof(*txd), GFP_NOWAIT);

	if (!txd)

		return NULL;
@@ -588,14 +585,14 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( 
		if (!v_lli)

			goto err_lli_free;



		if (dir == DMA_MEM_TO_DEV) {

			ret = sun6i_dma_cfg_lli(v_lli, sg_dma_address(sg),

						sconfig->dst_addr, sg_dma_len(sg),

						sconfig);

			if (ret)

				goto err_cur_lli_free;

		v_lli->len = sg_dma_len(sg);

		v_lli->para = NORMAL_WAIT;



			v_lli->cfg |= DMA_CHAN_CFG_DST_IO_MODE |

		if (dir == DMA_MEM_TO_DEV) {

			v_lli->src = sg_dma_address(sg);

			v_lli->dst = sconfig->dst_addr;

			v_lli->cfg = lli_cfg |

				DMA_CHAN_CFG_DST_IO_MODE |

				DMA_CHAN_CFG_SRC_LINEAR_MODE |

				DMA_CHAN_CFG_SRC_DRQ(DRQ_SDRAM) |

				DMA_CHAN_CFG_DST_DRQ(vchan->port);
@@ -607,13 +604,10 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( 
				sg_dma_len(sg), flags);



		} else {

			ret = sun6i_dma_cfg_lli(v_lli, sconfig->src_addr,

						sg_dma_address(sg), sg_dma_len(sg),

						sconfig);

			if (ret)

				goto err_cur_lli_free;



			v_lli->cfg |= DMA_CHAN_CFG_DST_LINEAR_MODE |

			v_lli->src = sconfig->src_addr;

			v_lli->dst = sg_dma_address(sg);

			v_lli->cfg = lli_cfg |

				DMA_CHAN_CFG_DST_LINEAR_MODE |

				DMA_CHAN_CFG_SRC_IO_MODE |

				DMA_CHAN_CFG_DST_DRQ(DRQ_SDRAM) |

				DMA_CHAN_CFG_SRC_DRQ(vchan->port);
@@ -634,8 +628,6 @@ static struct dma_async_tx_descriptor *sun6i_dma_prep_slave_sg( 


	return vchan_tx_prep(&vchan->vc, &txd->vd, flags);



err_cur_lli_free:

	dma_pool_free(sdev->pool, v_lli, p_lli);

err_lli_free:

	for (prev = txd->v_lli; prev; prev = prev->v_lli_next)

		dma_pool_free(sdev->pool, prev, virt_to_phys(prev));