From mboxrd@z Thu Jan 1 00:00:00 1970 From: Tony Lindgren Subject: Re: [PATCH] omap_hsmmc: Flush posted write to IRQ Date: Mon, 6 Apr 2009 09:49:18 -0700 Message-ID: <20090406164917.GA30724@atomide.com> References: <49D9EF0F.9090808@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Return-path: Received: from mho-02-ewr.mailhop.org ([204.13.248.72]:59885 "EHLO mho-02-ewr.mailhop.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1751461AbZDFQt3 (ORCPT ); Mon, 6 Apr 2009 12:49:29 -0400 Content-Disposition: inline In-Reply-To: <49D9EF0F.9090808@nokia.com> Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Adrian Hunter Cc: Pierre Ossman , LKML , Kevin Hilman , linux-omap Mailing List * Adrian Hunter [090406 05:00]: > From: Kevin Hilman > > Spurious IRQs seen on MMC after 2.6.29. Flush posted write in IRQ > handler. > > The interrupt line is released by clearing the error status bits > in the MMCHS_STAT register, which must occur before the interrupt > handler returns to avoid unwanted irqs. Hence the need to flush > the posted write. > > Signed-off-by: Kevin Hilman > Signed-off-by: Adrian Hunter Acked-by: Tony Lindgen > --- > > > > > This patch is slightly modified from Kevin's original, which is > here: > > http://marc.info/?l=linux-omap&m=123862814815052&w=2 > > > > drivers/mmc/host/omap_hsmmc.c | 4 ++++ > 1 files changed, 4 insertions(+), 0 deletions(-) > > diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c > index 04e5a0c..2ae6049 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -452,6 +452,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id) > if (host->mrq == NULL) { > OMAP_HSMMC_WRITE(host->base, STAT, > OMAP_HSMMC_READ(host->base, STAT)); > + /* Flush posted write */ > + OMAP_HSMMC_READ(host->base, STAT); > return IRQ_HANDLED; > } > > @@ -523,6 +525,8 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id) > } > > OMAP_HSMMC_WRITE(host->base, STAT, status); > + /* Flush posted write */ > + OMAP_HSMMC_READ(host->base, STAT); > > if (end_cmd || (status & CC)) > mmc_omap_cmd_done(host, host->cmd); > -- > 1.5.6.3