spi: dw-spi: Single Register read to clear IRQs

Instead of clearing the RxU, RxO, and TxO IRQs individually with
3 register reads, a single read of the ICR register will do the
same thing.

Signed-off-by: Thor Thayer <tthayer@opensource.altera.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>

1 files changed, 1 insertions, 3 deletions

diff --git a/drivers/spi/spi-dw.c b/drivers/spi/spi-dw.c
index 2437bfcbf2f8..0f0106933b52 100644
--- a/drivers/spi/spi-dw.c
+++ b/drivers/spi/spi-dw.c
@@ -232,9 +232,7 @@ static irqreturn_t interrupt_transfer(struct dw_spi *dws)
 
         /* Error handling */
         if (irq_status & (SPI_INT_TXOI | SPI_INT_RXOI | SPI_INT_RXUI)) {
-                dw_readw(dws, DW_SPI_TXOICR);
-                dw_readw(dws, DW_SPI_RXOICR);
-                dw_readw(dws, DW_SPI_RXUICR);
+                dw_readw(dws, DW_SPI_ICR);
                 int_error_stop(dws, "interrupt_transfer: fifo overrun/underrun");
                 return IRQ_HANDLED;
         }