UbiquitousOS
/
OpenCloudOS-Kernel
mirror of https://gitee.com/OpenCloudOS/OpenCloudOS-Kernel.git
11
0
Fork 0
Code Issues Projects Releases Wiki Activity

dmaengine: at_xdmac: wait for in-progress transaction to complete after pausing a channel 

Signed-off-by: Cyrille Pitchen <cyrille.pitchen@atmel.com>
Signed-off-by: Ludovic Desroches <ludovic.desroches@atmel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>
This commit is contained in:
Cyrille Pitchen 2015-01-27 16:30:29 +01:00 committed by Vinod Koul
parent 12385f458a
commit cbb85e6726
1 changed files with 6 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

7
drivers/dma/at_xdmac.c
View File

@ -1136,9 +1136,14 @@ static int at_xdmac_device_pause(struct dma_chan *chan)
dev_dbg(chan2dev(chan), "%s\n", __func__);
if (test_and_set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status))
return 0;
spin_lock_bh(&atchan->lock);
at_xdmac_write(atxdmac, AT_XDMAC_GRWS, atchan->mask);
set_bit(AT_XDMAC_CHAN_IS_PAUSED, &atchan->status);
while (at_xdmac_chan_read(atchan, AT_XDMAC_CC)
& (AT_XDMAC_CC_WRIP | AT_XDMAC_CC_RDIP))
cpu_relax();
spin_unlock_bh(&atchan->lock);
return 0;