From 495aea4b571d1b7f77883f87754247b115627f68 Mon Sep 17 00:00:00 2001 From: Andy Shevchenko Date: Thu, 10 Jan 2013 11:11:41 +0200 Subject: [PATCH] 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: Andy Shevchenko Acked-by: Viresh Kumar Signed-off-by: Vinod Koul --- drivers/dma/dw_dmac.c | 13 +++++++------ 1 file changed, 7 insertions(+), 6 deletions(-) diff --git a/drivers/dma/dw_dmac.c b/drivers/dma/dw_dmac.c index a2c5a60bc2e2..e5378b5741be 100644 --- a/drivers/dma/dw_dmac.c +++ b/drivers/dma/dw_dmac.c @@ -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)); -- 2.39.5