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authorTrond Myklebust <Trond.Myklebust@netapp.com>2010-03-05 15:46:18 -0500
committerTrond Myklebust <Trond.Myklebust@netapp.com>2010-03-05 15:46:18 -0500
commit3fa04ecd72780da31ba8b329e148179bc24a9c7d (patch)
treef5d462fd4aee086952d18f159f737c450ab46b3b /drivers/usb/musb/musbhsdma.c
parent180b62a3d837613fcac3ce89576526423926c3c3 (diff)
parent1cda707d52e51a6cafac0aef12d2bd7052d572e6 (diff)
Merge branch 'writeback-for-2.6.34' into nfs-for-2.6.34
Diffstat (limited to 'drivers/usb/musb/musbhsdma.c')
-rw-r--r--drivers/usb/musb/musbhsdma.c25
1 files changed, 22 insertions, 3 deletions
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index a237550f91b..2fa7d5c00f3 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -250,20 +250,39 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
u8 bchannel;
u8 int_hsdma;
- u32 addr;
+ u32 addr, count;
u16 csr;
spin_lock_irqsave(&musb->lock, flags);
int_hsdma = musb_readb(mbase, MUSB_HSDMA_INTR);
- if (!int_hsdma)
- goto done;
#ifdef CONFIG_BLACKFIN
/* Clear DMA interrupt flags */
musb_writeb(mbase, MUSB_HSDMA_INTR, int_hsdma);
#endif
+ if (!int_hsdma) {
+ DBG(2, "spurious DMA irq\n");
+
+ for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) {
+ musb_channel = (struct musb_dma_channel *)
+ &(controller->channel[bchannel]);
+ channel = &musb_channel->channel;
+ if (channel->status == MUSB_DMA_STATUS_BUSY) {
+ count = musb_read_hsdma_count(mbase, bchannel);
+
+ if (count == 0)
+ int_hsdma |= (1 << bchannel);
+ }
+ }
+
+ DBG(2, "int_hsdma = 0x%x\n", int_hsdma);
+
+ if (!int_hsdma)
+ goto done;
+ }
+
for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) {
if (int_hsdma & (1 << bchannel)) {
musb_channel = (struct musb_dma_channel *)