McSPI slave mode interrupt handling

Hi,

I am having trouble getting an interrupt to fire on McSPI RX0_full event.

When I configure McSPI1 in slave mode, it sits quietly primed for input. 

Then when it receives the first 8 bits from the external master, the interrupt fires.

But the interrupt never fires again?

Here's is the debug version of my interrupt handler that I have added to spi-omap2-mcspi.c :

<code>

/* spi data irq handler */
static irqreturn_t mcspi_pio_irq_handler(int irq, void *dev_id)
{
    struct spi_master *master = dev_id;
   u32 l, d;

   // Identify interrupt event
   l = mcspi_read_reg(master, OMAP2_MCSPI_IRQSTATUS);

   //Read the data RX register to clear RX_full condition
   d = mcspi_read_reg(master, OMAP2_MCSPI_RX0);

   //Write to the data TX register to clear TX_empty condition
   mcspi_write_reg(master, OMAP2_MCSPI_TX0, d);

   dev_dbg(&master->dev, "fm: irq: status: %X data: %X\n", l, d);

   // Reset any interrupt event(s)

   l = 0x00000000;
   MOD_REG_BIT(l, OMAP2_MCSPI_IRQSTATUS_RX0_FULL, 1)
   mcspi_write_reg(master, OMAP2_MCSPI_IRQSTATUS, l);

   // Enable IRQ on RX0 full only
   l = 0x00000000;
   MOD_REG_BIT(l, OMAP2_MCSPI_IRQENABLE_RX0_FULL, 1);
   mcspi_write_reg(master, OMAP2_MCSPI_IRQENABLE, l);

   return IRQ_HANDLED;
}

</code>

Am I missing a step to get the interrupt to fire again?

Note: this is SPI1 (i.e. bus number 2 => the second instance of McSPI ).

Any help would be appreciated.

Regards,

Fergal