From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: from mail.linuxfoundation.org ([140.211.169.12]:38421 "EHLO mail.linuxfoundation.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752459AbbJQThr (ORCPT ); Sat, 17 Oct 2015 15:37:47 -0400 Subject: Patch "spi: spi-pxa2xx: Check status register to determine if SSSR_TINT is disabled" has been added to the 4.2-stable tree To: jui.nee.tan@intel.com, broonie@kernel.org, gregkh@linuxfoundation.org, jarkko.nikula@linux.intel.com Cc: , From: Date: Sat, 17 Oct 2015 12:37:46 -0700 Message-ID: <1445110666255130@kroah.com> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org List-ID: 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 know about it. >>From 02bc933ebb59208f42c2e6305b2c17fd306f695d Mon Sep 17 00:00:00 2001 From: "Tan, Jui Nee" 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" 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 Acked-by: Jarkko Nikula Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- 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