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omap: dma: Add read-back to DMA interrupt handler to avoid spuriousinterrupts

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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>
This commit is contained in:
Mathias Nyman 2010-10-25 14:35:24 +00:00 committed by Tony Lindgren
parent b7283945c5
commit e860e6da96
1 changed files with 2 additions and 0 deletions
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arch/arm/plat-omap/dma.c
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@ -1983,6 +1983,8 @@ static int omap2_dma_handle_ch(int ch)
dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch)); dma_write(OMAP2_DMA_CSR_CLEAR_MASK, CSR(ch));
dma_write(1 << ch, IRQSTATUS_L0); 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 the ch is not chained then chain_id will be -1 */
if (dma_chan[ch].chain_id != -1) { if (dma_chan[ch].chain_id != -1) {