Commit 495aea4b authored by Andy Shevchenko's avatar Andy Shevchenko Committed by Vinod Koul
Browse files

dw_dmac: make usage of dw_dma_slave optional 



The driver requires a custom slave configuration to be present to be able to
make the slave transfers. Nevertheless, in some cases we need only the request
line as an additional information to the generic slave configuration.  The
request line is provided by slave_id parameter of the dma_slave_config
structure. That's why the custom slave configuration could be optional for such
cases.

Signed-off-by: default avatarAndy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: default avatarViresh Kumar <viresh.kumar@linaro.org>
Signed-off-by: default avatarVinod Koul <vinod.koul@intel.com>
parent 0fdb567f

drivers/dma/dw_dmac.c

+7 −6
Original line number Diff line number Diff line
@@ -50,11 +50,12 @@ static inline unsigned int dwc_get_sms(struct dw_dma_slave *slave) 
		struct dw_dma_slave *__slave = (_chan->private);	\

		struct dw_dma_chan *_dwc = to_dw_dma_chan(_chan);	\

		struct dma_slave_config	*_sconfig = &_dwc->dma_sconfig;	\

		bool _is_slave = is_slave_direction(_dwc->direction);	\

		int _dms = dwc_get_dms(__slave);		\

		int _sms = dwc_get_sms(__slave);		\

		u8 _smsize = __slave ? _sconfig->src_maxburst :	\

		u8 _smsize = _is_slave ? _sconfig->src_maxburst :	\

			DW_DMA_MSIZE_16;			\

		u8 _dmsize = __slave ? _sconfig->dst_maxburst :	\

		u8 _dmsize = _is_slave ? _sconfig->dst_maxburst :	\

			DW_DMA_MSIZE_16;			\

								\

		(DWC_CTLL_DST_MSIZE(_dmsize)			\
@@ -328,7 +329,7 @@ dwc_descriptor_complete(struct dw_dma_chan *dwc, struct dw_desc *desc, 
	list_splice_init(&desc->tx_list, &dwc->free_list);

	list_move(&desc->desc_node, &dwc->free_list);



	if (!dwc->chan.private) {

	if (!is_slave_direction(dwc->direction)) {

		struct device *parent = chan2parent(&dwc->chan);

		if (!(txd->flags & DMA_COMPL_SKIP_DEST_UNMAP)) {

			if (txd->flags & DMA_COMPL_DEST_UNMAP_SINGLE)
@@ -804,7 +805,7 @@ dwc_prep_slave_sg(struct dma_chan *chan, struct scatterlist *sgl, 


	dev_vdbg(chan2dev(chan), "%s\n", __func__);



	if (unlikely(!dws || !sg_len))

	if (unlikely(!is_slave_direction(direction) || !sg_len))

		return NULL;



	dwc->direction = direction;
@@ -980,8 +981,8 @@ set_runtime_config(struct dma_chan *chan, struct dma_slave_config *sconfig) 
{

	struct dw_dma_chan *dwc = to_dw_dma_chan(chan);



	/* Check if it is chan is configured for slave transfers */

	if (!chan->private)

	/* Check if chan will be configured for slave transfers */

	if (!is_slave_direction(sconfig->direction))

		return -EINVAL;



	memcpy(&dwc->dma_sconfig, sconfig, sizeof(*sconfig));

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