Patch "spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled" has been added to the 4.2-stable tree

[<gregkh@linuxfoundation.org>]

This is a note to let you know that I've just added the patch titled

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

to the 4.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     spi-spi-pxa2xx-check-status-register-to-determine-if-sssr_tint-is-disabled.patch
and it can be found in the queue-4.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 02bc933ebb59208f42c2e6305b2c17fd306f695d Mon Sep 17 00:00:00 2001
From: "Tan, Jui Nee" <jui.nee.tan@intel.com>
Date: Tue, 1 Sep 2015 10:22:51 +0800
Subject: spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled

From: "Tan, Jui Nee" <jui.nee.tan@intel.com>

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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/spi/spi-pxa2xx.c |    4 ++++
 1 file changed, 4 insertions(+)

--- a/drivers/spi/spi-pxa2xx.c
+++ b/drivers/spi/spi-pxa2xx.c
@@ -643,6 +643,10 @@ static irqreturn_t ssp_int(int irq, void
 	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;
 


Patches currently in stable-queue which might be from jui.nee.tan@intel.com are

queue-4.2/spi-spi-pxa2xx-check-status-register-to-determine-if-sssr_tint-is-disabled.patch