From mboxrd@z Thu Jan 1 00:00:00 1970 From: Adrian Hunter Subject: [PATCH] omap_hsmmc: Flush posted write to IRQ Date: Mon, 06 Apr 2009 15:01:19 +0300 Message-ID: <49D9EF0F.9090808@nokia.com> Mime-Version: 1.0 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: 7bit Return-path: Received: from smtp.nokia.com ([192.100.105.134]:47091 "EHLO mgw-mx09.nokia.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755481AbZDFMBG (ORCPT ); Mon, 6 Apr 2009 08:01:06 -0400 Sender: linux-omap-owner@vger.kernel.org List-Id: linux-omap@vger.kernel.org To: Pierre Ossman Cc: LKML , Kevin Hilman , Tony Lindgren , linux-omap Mailing List 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 --- 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