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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2015-10-13 20:09:19 +0300
committerVinod Koul <vinod.koul@intel.com>2015-10-31 05:02:43 +0300
commitdf5c7386f62d2db95ca48005087195e9a15e2b1f (patch)
treecd017e1d7050b7fd44ee4db9e728e193afc83b99 /drivers/dma
parent175267b389f781748e2bbb6c737e76b5c9bc4c88 (diff)
downloadlinux-df5c7386f62d2db95ca48005087195e9a15e2b1f.tar.xz
dmaengine: dw: some Intel devices has no memcpy support
Provide a flag to choose if the device does support memory-to-memory transfers. At least this is not true for iDMA32 controller that might be supported in the future. Besides that Intel BayTrail and Braswell users should not try this feature due to HW specific behaviour. Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Vinod Koul <vinod.koul@intel.com>
Diffstat (limited to 'drivers/dma')
-rw-r--r--drivers/dma/dw/core.c6
1 files changed, 5 insertions, 1 deletions
diff --git a/drivers/dma/dw/core.c b/drivers/dma/dw/core.c
index f16d1ed99ba9..41e9554b884d 100644
--- a/drivers/dma/dw/core.c
+++ b/drivers/dma/dw/core.c
@@ -1541,6 +1541,7 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
/* Fill platform data with the default values */
pdata->is_private = true;
+ pdata->is_memcpy = true;
pdata->chan_allocation_order = CHAN_ALLOCATION_ASCENDING;
pdata->chan_priority = CHAN_PRIORITY_ASCENDING;
} else if (pdata->nr_channels > DW_DMA_MAX_NR_CHANNELS) {
@@ -1653,10 +1654,13 @@ int dw_dma_probe(struct dw_dma_chip *chip, struct dw_dma_platform_data *pdata)
dma_writel(dw, CLEAR.DST_TRAN, dw->all_chan_mask);
dma_writel(dw, CLEAR.ERROR, dw->all_chan_mask);
- dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
+ /* Set capabilities */
dma_cap_set(DMA_SLAVE, dw->dma.cap_mask);
if (pdata->is_private)
dma_cap_set(DMA_PRIVATE, dw->dma.cap_mask);
+ if (pdata->is_memcpy)
+ dma_cap_set(DMA_MEMCPY, dw->dma.cap_mask);
+
dw->dma.dev = chip->dev;
dw->dma.device_alloc_chan_resources = dwc_alloc_chan_resources;
dw->dma.device_free_chan_resources = dwc_free_chan_resources;