Gitweb: http://git.kernel.org/linus/9b08284bf22f438baa2d6b68015ff17ddb431a61
Commit: 9b08284bf22f438baa2d6b68015ff17ddb431a61
Parent: 7507f39c57d4a285aea11c379fbc65c2b3f375ef
Author: Jassi Brar <jassi.brar@samsung.com>
AuthorDate: Thu Nov 5 13:44:33 2009 +0900
Committer: Ben Dooks <ben-linux@fluff.org>
CommitDate: Mon Nov 9 23:51:03 2009 +0000
ARM: S3C64XX: DMA: Callback with correct buffer pointer
buffdone callback should be called per buffer request with pointer
to the latest serviced request.
'next' should point to the one next to currently active.
Signed-off-by: Jassi Brar <jassi.brar@samsung.com>
Signed-off-by: Ben Dooks <ben-linux@fluff.org>
---
arch/arm/plat-s3c64xx/dma.c | 29 ++++++++++++++++++++++++++++-
1 files changed, 28 insertions(+), 1 deletions(-)
diff --git a/arch/arm/plat-s3c64xx/dma.c b/arch/arm/plat-s3c64xx/dma.c
index a94281b..7d12eb8 100644
--- a/arch/arm/plat-s3c64xx/dma.c
+++ b/arch/arm/plat-s3c64xx/dma.c
@@ -576,6 +576,7 @@ static irqreturn_t s3c64xx_dma_irq(int irq, void *pw)
errstat = readl(dmac->regs + PL080_ERR_STATUS);
for (offs = 0, bit = 1; offs < 8; offs++, bit <<= 1) {
+ struct s3c64xx_dma_buff *buff;
if (!(errstat & bit) && !(tcstat & bit))
continue;
@@ -591,7 +592,33 @@ static irqreturn_t s3c64xx_dma_irq(int irq, void *pw)
if (errstat & bit)
writel(bit, dmac->regs + PL080_ERR_CLEAR);
- s3c64xx_dma_bufffdone(chan, chan->curr, res);
+ /* 'next' points to the buffer that is next to the
+ * currently active buffer.
+ * For CIRCULAR queues, 'next' will be same as 'curr'
+ * when 'end' is the active buffer.
+ */
+ buff = chan->curr;
+ while (buff && buff != chan->next
+ && buff->next != chan->next)
+ buff = buff->next;
+
+ if (!buff)
+ BUG();
+
+ if (buff == chan->next)
+ buff = chan->end;
+
+ s3c64xx_dma_bufffdone(chan, buff, res);
+
+ /* Update 'next' */
+ buff = chan->next;
+ if (chan->next == chan->end) {
+ chan->next = chan->curr;
+ if (!(chan->flags & S3C2410_DMAF_CIRCULAR))
+ chan->end = NULL;
+ } else {
+ chan->next = buff->next;
+ }
}
return IRQ_HANDLED;
--
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