diff options
Diffstat (limited to 'drivers/dma/ep93xx_dma.c')
| -rw-r--r-- | drivers/dma/ep93xx_dma.c | 28 |
1 files changed, 15 insertions, 13 deletions
diff --git a/drivers/dma/ep93xx_dma.c b/drivers/dma/ep93xx_dma.c index 57ff46284f15..21f08cc3352b 100644 --- a/drivers/dma/ep93xx_dma.c +++ b/drivers/dma/ep93xx_dma.c @@ -421,23 +421,25 @@ static int m2p_hw_interrupt(struct ep93xx_dma_chan *edmac) desc->size); } - switch (irq_status & (M2P_INTERRUPT_STALL | M2P_INTERRUPT_NFB)) { - case M2P_INTERRUPT_STALL: - /* Disable interrupts */ - control = readl(edmac->regs + M2P_CONTROL); - control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT); - m2p_set_control(edmac, control); - - return INTERRUPT_DONE; - - case M2P_INTERRUPT_NFB: - if (ep93xx_dma_advance_active(edmac)) - m2p_fill_desc(edmac); + /* + * Even latest E2 silicon revision sometimes assert STALL interrupt + * instead of NFB. Therefore we treat them equally, basing on the + * amount of data we still have to transfer. + */ + if (!(irq_status & (M2P_INTERRUPT_STALL | M2P_INTERRUPT_NFB))) + return INTERRUPT_UNKNOWN; + if (ep93xx_dma_advance_active(edmac)) { + m2p_fill_desc(edmac); return INTERRUPT_NEXT_BUFFER; } - return INTERRUPT_UNKNOWN; + /* Disable interrupts */ + control = readl(edmac->regs + M2P_CONTROL); + control &= ~(M2P_CONTROL_STALLINT | M2P_CONTROL_NFBINT); + m2p_set_control(edmac, control); + + return INTERRUPT_DONE; } /* |