Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755302AbaD1LCq (ORCPT ); Mon, 28 Apr 2014 07:02:46 -0400 Received: from mail-qc0-f177.google.com ([209.85.216.177]:35440 "EHLO mail-qc0-f177.google.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755226AbaD1LCn (ORCPT ); Mon, 28 Apr 2014 07:02:43 -0400 MIME-Version: 1.0 In-Reply-To: <1398540855-27367-3-git-send-email-sebastian.hesselbarth@gmail.com> References: <1398540855-27367-1-git-send-email-sebastian.hesselbarth@gmail.com> <1398540855-27367-3-git-send-email-sebastian.hesselbarth@gmail.com> Date: Mon, 28 Apr 2014 13:02:42 +0200 Message-ID: Subject: Re: [PATCH RESEND 2/3] mmc: mvsdio: workaround for spurious irqs From: Ulf Hansson To: Sebastian Hesselbarth Cc: Nicolas Pitre , Chris Ball , Jason Cooper , Andrew Lunn , Gregory Clement , linux-mmc , "linux-arm-kernel@lists.infradead.org" , "linux-kernel@vger.kernel.org" Content-Type: text/plain; charset=UTF-8 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org On 26 April 2014 21:34, Sebastian Hesselbarth wrote: > SDIO controllers found on Marvell Kirkwood SoCs seem to cause a late, > spurious irq although all interrupts have been disabled. This irq > doesn't do any harm, neither to HW nor driver. To avoid some > "unexpected irq" warning later, we workaround above issue by bailing > out of irq handler early, if we didn't expect any. > > Signed-off-by: Sebastian Hesselbarth > Acked-by: Jason Cooper > --- > Cc: Nicolas Pitre > Cc: Chris Ball > Cc: Ulf Hansson > Cc: Jason Cooper > Cc: Andrew Lunn > Cc: Gregory Clement > Cc: linux-mmc@vger.kernel.org > Cc: linux-arm-kernel@lists.infradead.org > Cc: linux-kernel@vger.kernel.org Acked-by: Ulf Hansson > --- > drivers/mmc/host/mvsdio.c | 14 ++++++++++++++ > 1 file changed, 14 insertions(+) > > diff --git a/drivers/mmc/host/mvsdio.c b/drivers/mmc/host/mvsdio.c > index 41aca7f28c23..9377284f8544 100644 > --- a/drivers/mmc/host/mvsdio.c > +++ b/drivers/mmc/host/mvsdio.c > @@ -354,6 +354,20 @@ static irqreturn_t mvsd_irq(int irq, void *dev) > intr_status, mvsd_read(MVSD_NOR_INTR_EN), > mvsd_read(MVSD_HW_STATE)); > > + /* > + * It looks like, SDIO IP can issue one late, spurious irq > + * although all irqs should be disabled. To work around this, > + * bail out early, if we didn't expect any irqs to occur. > + */ > + if (!mvsd_read(MVSD_NOR_INTR_EN) && !mvsd_read(MVSD_ERR_INTR_EN)) { > + dev_dbg(host->dev, "spurious irq detected intr 0x%04x intr_en 0x%04x erri 0x%04x erri_en 0x%04x\n", > + mvsd_read(MVSD_NOR_INTR_STATUS), > + mvsd_read(MVSD_NOR_INTR_EN), > + mvsd_read(MVSD_ERR_INTR_STATUS), > + mvsd_read(MVSD_ERR_INTR_EN)); > + return IRQ_HANDLED; > + } > + > spin_lock(&host->lock); > > /* PIO handling, if needed. Messy business... */ > -- > 1.9.1 > -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/