Messages in this thread | | | Date | Thu, 08 Jan 2009 14:17:59 +0200 | From | Adrian Hunter <> | Subject | Re: [PATCH] OMAP: MMC: recover from transfer failures |
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Jean Pihet wrote: > Thanks for the suggestion, it works great (stress tested) and is a cleaner > fix. > Here is a patch the latest linux-omap-2.6 tree. Is this OK?
OK by me.
> Regards, > Jean > > From d143f6b2e705aa4e9d2b032097fd1c82f8163262 Mon Sep 17 00:00:00 2001 > From: Jean Pihet <jpihet@mvista.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@mvista.com> > Signed-off-by: Jean Pihet <jpihet@mvista.com> > Signed-off-by: Adrian Hunter <ext-adrian.hunter@nokia.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 Thursday 08 January 2009 10:02:24 Adrian Hunter wrote: >> Why not do the reset in mmc_omap_irq() like the other resets? >> e.g. >> >> static irqreturn_t mmc_omap_irq(int irq, void *dev_id) >> ... >> if ((status & CMD_TIMEOUT) || >> (status & CMD_CRC)) { >> if (host->cmd) { >> if (status & CMD_TIMEOUT) { >> OMAP_HSMMC_WRITE(host->base, >> SYSCTL, OMAP_HSMMC_READ(host->base, SYSCTL) | SRC); while >> (OMAP_HSMMC_READ(host->base, SYSCTL) & SRC) ; >> >> host->cmd->error = -ETIMEDOUT; >> } else { >> host->cmd->error = -EILSEQ; >> } >> 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)) { > >
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