From: Mathias Nyman <mathias.ny...@nokia.com>
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.ny...@nokia.com>
Acked-by: Santosh Shilimkar <santosh.shilim...@ti.com>
Signed-off-by: Tony Lindgren <t...@atomide.com>
---
arch/arm/plat-omap/dma.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/arch/arm/plat-omap/dma.c b/arch/arm/plat-omap/dma.c
index f5c5b8d..2c28265 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) {
--
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