From e860e6da96f5a320a752da232e03d7bf885710b7 Mon Sep 17 00:00:00 2001 From: Mathias Nyman Date: Mon, 25 Oct 2010 14:35:24 +0000 Subject: [PATCH] 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 Acked-by: Santosh Shilimkar Signed-off-by: Tony Lindgren --- arch/arm/plat-omap/dma.c | 2 ++ 1 file changed, 2 insertions(+) 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) { -- 2.7.4