spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled

commit 02bc933ebb59208f42c2e6305b2c17fd306f695d upstream.

On Intel Baytrail, there is case when interrupt handler get called, no SPI
message is captured. The RX FIFO is indeed empty when RX timeout pending
interrupt (SSSR_TINT) happens.

Use the BIOS version where both HSUART and SPI are on the same IRQ. Both
drivers are using IRQF_SHARED when calling the request_irq function. When
running two separate and independent SPI and HSUART application that
generate data traffic on both components, user will see messages like
below on the console:

  pxa2xx-spi pxa2xx-spi.0: bad message state in interrupt handler

This commit will fix this by first checking Receiver Time-out Interrupt,
if it is disabled, ignore the request and return without servicing.

Signed-off-by: Tan, Jui Nee <jui.nee.tan@intel.com>
Acked-by: Jarkko Nikula <jarkko.nikula@linux.intel.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>

diff --git a/drivers/spi/spi-pxa2xx.c b/drivers/spi/spi-pxa2xx.c
index dc25bee8d33f1d6f93deea0030712a681579b1d0..2ecc2d6464fbdd726a7425a69eb5872c1873687e 100644 (file)
--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -799,6 +799,10 @@ static irqreturn_t ssp_int(int irq, void *dev_id)
        if (!(sccr1_reg & SSCR1_TIE))
                mask &= ~SSSR_TFS;
 
+       /* Ignore RX timeout interrupt if it is disabled */
+       if (!(sccr1_reg & SSCR1_TINTE))
+               mask &= ~SSSR_TINT;
+
        if (!(status & mask))
                return IRQ_NONE;