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| author | Cyrille Pitchen <cyrille.pitchen@atmel.com> | 2015-01-27 16:30:29 +0100 |
|---|---|---|
| committer | Vinod Koul <vinod.koul@intel.com> | 2015-02-04 23:12:28 -0800 |
| commit | cbb85e672690ad3d02e97aeba33a1e1f722bbacc (patch) | |
| tree | 0a42e808a51270dc7491847df312384b6131604a | |
| parent | 12385f458a27fe46da31483ed9f9ec5e9da575e7 (diff) | |
| download | linux-cbb85e672690ad3d02e97aeba33a1e1f722bbacc.tar.bz2 | |
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>
| -rw-r--r-- | drivers/dma/at_xdmac.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/dma/at_xdmac.c b/drivers/dma/at_xdmac.c index c39000b9980a..ed8a576cee7b 100644 --- a/drivers/dma/at_xdmac.c +++ b/drivers/dma/at_xdmac.c @@ -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; |