[PATCH 3.13 084/163] spi: sirf: enable RX_IO_DMA_INT interrupt

[Kamal Mostafa]

3.13.11.9 -stable review patch.  If anyone has any objections, please let me know.

------------------

From: Qipan Li <Qipan.Li@xxxxxxx>

commit f2a08b404691ef3e7be6ce81c185335cfc68b6db upstream.

in spi interrupt handler, we need check RX_IO_DMA status to ensure
rx fifo have received the specify count data.

if not set, the while statement in spi isr function will keep loop,
at last, make the kernel hang.

[The code is actually there in the interrupt handler but apparently it
needs the interrupt unmasking so the handler sees the status -- broonie]

Signed-off-by: Qipan Li <Qipan.Li@xxxxxxx>
Signed-off-by: Barry Song <Baohua.Song@xxxxxxx>
Signed-off-by: Mark Brown <broonie@xxxxxxxxxx>
[ kamal: backport to 3.13-stable: applied to spi_sirfsoc_transfer's pio path. ]
Signed-off-by: Kamal Mostafa <kamal@xxxxxxxxxxxxx>
---
 drivers/spi/spi-sirf.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-sirf.c b/drivers/spi/spi-sirf.c
index ed5e501..10bd831 100644
--- a/drivers/spi/spi-sirf.c
+++ b/drivers/spi/spi-sirf.c
@@ -366,7 +366,9 @@ static int spi_sirfsoc_transfer(struct spi_device *spi, struct spi_transfer *t)
 		writel(SIRFSOC_SPI_RX_OFLOW_INT_EN | SIRFSOC_SPI_TX_UFLOW_INT_EN |
 			SIRFSOC_SPI_RXFIFO_THD_INT_EN | SIRFSOC_SPI_TXFIFO_THD_INT_EN |
 			SIRFSOC_SPI_FRM_END_INT_EN | SIRFSOC_SPI_RXFIFO_FULL_INT_EN |
-			SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN, sspi->base + SIRFSOC_SPI_INT_EN);
+			SIRFSOC_SPI_TXFIFO_EMPTY_INT_EN |
+			SIRFSOC_SPI_RX_IO_DMA_INT_EN,
+			sspi->base + SIRFSOC_SPI_INT_EN);
 	}
 
 	writel(SIRFSOC_SPI_RX_EN | SIRFSOC_SPI_TX_EN, sspi->base + SIRFSOC_SPI_TX_RX_EN);
-- 
1.9.1

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