diff options
| author | Nicolas Ferre <nicolas.ferre@microchip.com> | 2019-04-03 12:23:59 +0200 |
|---|---|---|
| committer | Vinod Koul <vkoul@kernel.org> | 2019-04-23 10:38:56 +0530 |
| commit | 38a829a389e33d571a3c599fa762d88b3d1f72c4 (patch) | |
| tree | 8eb5385f7490a6322454b6c4ffaa564a6cd2a071 /drivers/dma/at_xdmac.c | |
| parent | 223a4f4cfe93de2fce47a8f1f719cf4d0da4e3e6 (diff) | |
| download | linux-38a829a389e33d571a3c599fa762d88b3d1f72c4.tar.bz2 | |
dmaengine: at_xdmac: only monitor overflow errors for peripheral xfer
The overflow error flag (ROI: Request Overflow Error) is only relevant
for the case when the channel handles a peripheral synchronized transfer.
Not in the case of memory to memory transfer where there is no hardware
request signal.
Remove the use of this interrupt source in such a case. It's based on
the first descriptor which holds the configuration for the whole
linked list transfer.
Signed-off-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Acked-by: Ludovic Desroches <ludovic.desroches@microchip.com>
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Diffstat (limited to 'drivers/dma/at_xdmac.c')
| -rw-r--r-- | drivers/dma/at_xdmac.c | 13 |
1 files changed, 12 insertions, 1 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index 1dd7edaefbdc..06cbe54e4c30 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -308,6 +308,11 @@ static inline int at_xdmac_csize(u32 maxburst) return csize; }; +static inline bool at_xdmac_chan_is_peripheral_xfer(u32 cfg) +{ + return cfg & AT_XDMAC_CC_TYPE_PER_TRAN; +} + static inline u8 at_xdmac_get_dwidth(u32 cfg) { return (cfg & AT_XDMAC_CC_DWIDTH_MASK) >> AT_XDMAC_CC_DWIDTH_OFFSET; @@ -389,7 +394,13 @@ static void at_xdmac_start_xfer(struct at_xdmac_chan *atchan, at_xdmac_chan_read(atchan, AT_XDMAC_CUBC)); at_xdmac_chan_write(atchan, AT_XDMAC_CID, 0xffffffff); - reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE | AT_XDMAC_CIE_ROIE; + reg = AT_XDMAC_CIE_RBEIE | AT_XDMAC_CIE_WBEIE; + /* + * Request Overflow Error is only for peripheral synchronized transfers + */ + if (at_xdmac_chan_is_peripheral_xfer(first->lld.mbr_cfg)) + reg |= AT_XDMAC_CIE_ROIE; + /* * There is no end of list when doing cyclic dma, we need to get * an interrupt after each periods. |