The XDMAC DMA controller uses a concept of views to be able to handle
descriptors of different sizes.
So far, only the views 1 and 2 were handled by the driver. Unfortunately, we
need some of the configuration fields found in the view 3 in order to support
memset and interleaved transfers.
Add the definition for the view 3 registers, and the needed code to handle view
3 descriptors.
Signed-off-by: Maxime Ripard <maxime.ripard@xxxxxxxxxxxxxxxxxx>
---
drivers/dma/at_xdmac.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c
index 933e4b338459..2d039512ecb3 100644
--- a/drivers/dma/at_xdmac.c
+++ b/drivers/dma/at_xdmac.c
@@ -236,6 +236,10 @@ struct at_xdmac_lld {
dma_addr_t mbr_sa; /* Source Address Member */
dma_addr_t mbr_da; /* Destination Address Member */
u32 mbr_cfg; /* Configuration Register */
+ u32 mbr_bc; /* Block Control Register */
+ u32 mbr_ds; /* Data Stride Register */
+ u32 mbr_sus; /* Source Microblock Stride Register */
+ u32 mbr_dus; /* Destination Microblock Stride Register */
};
@@ -359,6 +363,8 @@ static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan,
if (at_xdmac_chan_is_cyclic(atchan)) {
reg = AT_XDMAC_CNDC_NDVIEW_NDV1;
at_xdmac_chan_write(atchan, AT_XDMAC_CC, first->lld.mbr_cfg);
+ } else if (first->lld.mbr_ubc & AT_XDMAC_MBR_UBC_NDV3) {
+ reg = AT_XDMAC_CNDC_NDVIEW_NDV3;
} else {
/*
* No need to write AT_XDMAC_CC reg, it will be done when the
--
2.3.6
--
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