[PATCH v4 1/2] spi: implemented driver for Cirrus EP93xx SPI controller

[Martin Guy]

Hi, another little fix:

EP93xx User's Manual -> Synchronous Serial Port -> Registers

SSPIIR description:
"Read Only
Note: A write to this register clears the receive overrun interrupt,
regardless of the data
      value written."

It doesn't affect the RIS/TIS ones, which are caused by the state of the device.

so

static irqreturn_t ep93xx_spi_interrupt(int irq, void *dev_id)
{
...
        if (!(irq_status & (SSPIIR_RORIS | SSPIIR_TIS | SSPIIR_RIS)))
                return IRQ_NONE; /* not for us */

-       /* clear the interrupt */
-       ep93xx_spi_write_u8(espi, SSPICR, 0);

        /*
         * If we got ROR (receive overrun) interrupt we know that something is
         * wrong. Just abort the message.
         */
        if (unlikely(irq_status & SSPIIR_RORIS)) {
+               /* clear the overrun interrupt */
+               ep93xx_spi_write_u8(espi, SSPICR, 0);
                dev_warn(&espi->pdev->dev,
                         "receive overrun, aborting the message\n");
                espi->current_msg->status = -EIO;
        } else {