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

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 <[email protected]> know about it.

From: "Tan, Jui Nee" <[email protected]>
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" <[email protected]>

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.

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

@@ -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 [email protected] are

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