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authorCliff Cai <cliff.cai@analog.com>2009-11-16 16:19:26 +0530
committerGreg Kroah-Hartman <gregkh@suse.de>2009-12-11 11:55:24 -0800
commit6bd03e7b9d0f70928f9cd793326c28e4e08ffc96 (patch)
tree0ce38b2a5eb23bf1d7efd54494a9f617a1add84b /drivers/usb
parent2002e7684dc24a9ac245b7d015380918657ec032 (diff)
USB: musb: clear the Blackfin interrupt pending bits early in the ISR
If we clear the interrupt pending bits at the end, we sometimes return too fast and have the same interrupt assert itself. There is no way in a Blackfin system to force a sync of this state, so the hardware manual instructs people to clear interrupt flags early in their ISR. Signed-off-by: Cliff Cai <cliff.cai@analog.com> Signed-off-by: Mike Frysinger <vapier@gentoo.org> Signed-off-by: Anand Gadiyar <gadiyar@ti.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'drivers/usb')
-rw-r--r--drivers/usb/musb/musbhsdma.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/drivers/usb/musb/musbhsdma.c b/drivers/usb/musb/musbhsdma.c
index 5e83f96d6b7..c767387f507 100644
--- a/drivers/usb/musb/musbhsdma.c
+++ b/drivers/usb/musb/musbhsdma.c
@@ -259,6 +259,11 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
if (!int_hsdma)
goto done;
+#ifdef CONFIG_BLACKFIN
+ /* Clear DMA interrupt flags */
+ musb_writeb(mbase, MUSB_HSDMA_INTR, int_hsdma);
+#endif
+
for (bchannel = 0; bchannel < MUSB_HSDMA_CHANNELS; bchannel++) {
if (int_hsdma & (1 << bchannel)) {
musb_channel = (struct musb_dma_channel *)
@@ -324,11 +329,6 @@ static irqreturn_t dma_controller_irq(int irq, void *private_data)
}
}
-#ifdef CONFIG_BLACKFIN
- /* Clear DMA interrup flags */
- musb_writeb(mbase, MUSB_HSDMA_INTR, int_hsdma);
-#endif
-
retval = IRQ_HANDLED;
done:
spin_unlock_irqrestore(&musb->lock, flags);