linux-kernel - [PATCH] OMAP: MMC: recover from transfer failures

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Message-Id: <200902031505.58697.jpihet@mvista.com>
Date:	Tue, 3 Feb 2009 15:05:58 +0100
From:	Jean Pihet <jpihet@...sta.com>
To:	Tony Lindgren <tony@...mide.com>,
	Adrian Hunter <ext-adrian.hunter@...ia.com>,
	linux-arm-kernel@...ts.arm.linux.org.uk,
	linux-omap@...r.kernel.org,
	"Jarkko Lavinen (NMP/Helsinki)" <jarkko.lavinen@...ia.com>,
	Pierre Ossman <drzeus-mmc@...eus.cx>,
	linux-kernel@...r.kernel.org
Subject: [PATCH] OMAP: MMC: recover from transfer failures - Resend

Hi,

This is a re-send of the patch that fixes a MMC host controller deadlock. The 
problem happens when removing the MMC/SD device when a transfer is on-going.

It has been tested on OMAP3430 but this fix should apply to OMAP2 chips as 
well, as seen from the TRMs.

Regards,
Jean

From d143f6b2e705aa4e9d2b032097fd1c82f8163262 Mon Sep 17 00:00:00 2001
From: Jean Pihet <jpihet@...sta.com>
Date: Thu, 8 Jan 2009 12:35:21 +0100
Subject: [PATCH] OMAP: MMC: recover from transfer failures

Timeouts during a command that has a data phase can result in the
next command issued after the command that failed not being processed,
i.e. no interrupt ever occurs to indicate the command has completed.
This failure can result in a deadlock.

This patch resets the data state machine to clear the error in
case of a command timeout.

Tested on OMAP3430 chip and intensive MMC/SD device removal while
transferring data.

Signed-off-by: Andy Lowe <alowe@...sta.com>
Signed-off-by: Jean Pihet <jpihet@...sta.com>
Signed-off-by: Adrian Hunter <ext-adrian.hunter@...ia.com>
---
 drivers/mmc/host/omap_hsmmc.c |    9 ++++++++-
 1 files changed, 8 insertions(+), 1 deletions(-)

diff --git a/drivers/mmc/host/omap_hsmmc.c b/drivers/mmc/host/omap_hsmmc.c
index d5c1e9d..97150c0 100644
--- a/drivers/mmc/host/omap_hsmmc.c
+++ b/drivers/mmc/host/omap_hsmmc.c
@@ -464,8 +464,15 @@ static irqreturn_t mmc_omap_irq(int irq, void *dev_id)
                                }
                                end_cmd = 1;
                        }
-                       if (host->data)
+                       if (host->data) {
                                mmc_dma_cleanup(host);
+                               OMAP_HSMMC_WRITE(host->base, SYSCTL,
+                                       OMAP_HSMMC_READ(host->base,
+                                                       SYSCTL) | SRD);
+                               while (OMAP_HSMMC_READ(host->base,
+                                               SYSCTL) & SRD)
+                                       ;
+                       }
                }
                if ((status & DATA_TIMEOUT) ||
                        (status & DATA_CRC)) {
--
1.5.4.4.21.gc4a6c


On Monday 02 February 2009 20:05:06 Tony Lindgren wrote:
> Hi,
>
> * Jean Pihet <jpihet@...sta.com> [090202 00:46]:
> > Tony,
> >
> > Has this patch been applied to the linux-omap tree? Does it need to go
> > the patchwork?
> >
> > Cf. http://marc.info/?l=linux-omap&m=123141577308177&w=2
>
> I'm not applying MMC patches, we need to move that discussion to LKML
> and keep Pierre involved.
>
> Jarkko Lavinen was planning to set up a git branch against the mainline
> tree for the omap mmc patches, so until we have that, let's just let the
> patches float on the list for a while.
>
> But yeah, if you want patchwork to pick up your patch so it does not
> get lost, just please resend it to the linux-omap list and it should
> get automatically picked up by patchwork.
>
> Regards,
>
> Tony



View attachment "OMAP-MMC-recover-from-transfer-failures.patch" of type "text/x-diff" (1500 bytes)