spi/s3c64xx: modified error interrupt handling and init

commit 375981f2e14868be16cafbffd34a4f16a6ee01c6 upstream.

The status of the interrupt is available in the status register,
so reading the clear pending register and writing back the same
value will not actually clear the pending interrupts. This patch
modifies the interrupt handler to read the status register and
clear the corresponding pending bit in the clear pending register.

Modified the hwInit function to clear all the pending interrupts.

Signed-off-by: Girish K S <ks.giri@samsung.com>
Signed-off-by: Mark Brown <broonie@opensource.wolfsonmicro.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/spi/spi-s3c64xx.c b/drivers/spi/spi-s3c64xx.c
index 972a94c58be3be01315af2f40aad90a067d4643d..486e864840204a8a16881a33ede19dab5708d5a8 100644 (file)
--- a/drivers/spi/spi-s3c64xx.c
+++ b/drivers/spi/spi-s3c64xx.c
@@ -889,25 +889,30 @@ static irqreturn_t s3c64xx_spi_irq(int irq, void *data)
 {
        struct s3c64xx_spi_driver_data *sdd = data;
        struct spi_master *spi = sdd->master;
-       unsigned int val;
+       unsigned int val, clr = 0;
 
-       val = readl(sdd->regs + S3C64XX_SPI_PENDING_CLR);
+       val = readl(sdd->regs + S3C64XX_SPI_STATUS);
 
-       val &= S3C64XX_SPI_PND_RX_OVERRUN_CLR |
-               S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
-               S3C64XX_SPI_PND_TX_OVERRUN_CLR |
-               S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
-
-       writel(val, sdd->regs + S3C64XX_SPI_PENDING_CLR);
-
-       if (val & S3C64XX_SPI_PND_RX_OVERRUN_CLR)
+       if (val & S3C64XX_SPI_ST_RX_OVERRUN_ERR) {
+               clr = S3C64XX_SPI_PND_RX_OVERRUN_CLR;
                dev_err(&spi->dev, "RX overrun\n");
-       if (val & S3C64XX_SPI_PND_RX_UNDERRUN_CLR)
+       }
+       if (val & S3C64XX_SPI_ST_RX_UNDERRUN_ERR) {
+               clr |= S3C64XX_SPI_PND_RX_UNDERRUN_CLR;
                dev_err(&spi->dev, "RX underrun\n");
-       if (val & S3C64XX_SPI_PND_TX_OVERRUN_CLR)
+       }
+       if (val & S3C64XX_SPI_ST_TX_OVERRUN_ERR) {
+               clr |= S3C64XX_SPI_PND_TX_OVERRUN_CLR;
                dev_err(&spi->dev, "TX overrun\n");
-       if (val & S3C64XX_SPI_PND_TX_UNDERRUN_CLR)
+       }
+       if (val & S3C64XX_SPI_ST_TX_UNDERRUN_ERR) {
+               clr |= S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
                dev_err(&spi->dev, "TX underrun\n");
+       }
+
+       /* Clear the pending irq by setting and then clearing it */
+       writel(clr, sdd->regs + S3C64XX_SPI_PENDING_CLR);
+       writel(0, sdd->regs + S3C64XX_SPI_PENDING_CLR);
 
        return IRQ_HANDLED;
 }
@@ -931,9 +936,13 @@ static void s3c64xx_spi_hwinit(struct s3c64xx_spi_driver_data *sdd, int channel)
        writel(0, regs + S3C64XX_SPI_MODE_CFG);
        writel(0, regs + S3C64XX_SPI_PACKET_CNT);
 
-       /* Clear any irq pending bits */
-       writel(readl(regs + S3C64XX_SPI_PENDING_CLR),
-                               regs + S3C64XX_SPI_PENDING_CLR);
+       /* Clear any irq pending bits, should set and clear the bits */
+       val = S3C64XX_SPI_PND_RX_OVERRUN_CLR |
+               S3C64XX_SPI_PND_RX_UNDERRUN_CLR |
+               S3C64XX_SPI_PND_TX_OVERRUN_CLR |
+               S3C64XX_SPI_PND_TX_UNDERRUN_CLR;
+       writel(val, regs + S3C64XX_SPI_PENDING_CLR);
+       writel(0, regs + S3C64XX_SPI_PENDING_CLR);
 
        writel(0, regs + S3C64XX_SPI_SWAP_CFG);