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authorMathias Nyman <mathias.nyman@nokia.com>2010-10-25 14:35:24 +0000
committerTony Lindgren <tony@atomide.com>2010-11-05 12:13:10 -0700
commite860e6da96f5a320a752da232e03d7bf885710b7 (patch)
tree9b2f363dc5f46f04421d0269efd1e5851760f432
parentb7283945c5ed8e78f0fe2c3313d8d1cdbc19b4b3 (diff)
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omap: dma: Add read-back to DMA interrupt handler to avoid spuriousinterrupts
Flush the writes to IRQSTATUS_L0 register in the DMA interrupt handler by reading the register directly after write. This prevents the spurious DMA interrupts noted when using VDD_OPP 1 Signed-off-by: Mathias Nyman <mathias.nyman@nokia.com> Acked-by: Santosh Shilimkar <Santosh.shilimkar@ti.com> Signed-off-by: Tony Lindgren <tony@atomide.com>
-rw-r--r--arch/arm/plat-omap/dma.c2
1 files changed, 2 insertions, 0 deletions
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index f5c5b8da9a8..2c2826571d4 100644
--- a/arch/arm/plat-omap/dma.c
+++ b/arch/arm/plat-omap/dma.c
@@ -1983,6 +1983,8 @@ static int omap2_dma_handle_ch(int ch)
dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
dma_write(1 << ch, IRQSTATUS_L0);
+ /* read back the register to flush the write */
+ dma_read(IRQSTATUS_L0);
/* If the ch is not chained then chain_id will be -1 */
if (dma_chan[ch].chain_id != -1) {