> -----Original Message----- > From: Chris Ball [mailto:cjb@xxxxxxxxxx] > Sent: Thursday, March 08, 2012 10:39 PM > To: Maupin, Chase > Cc: linux-omap@xxxxxxxxxxxxxxx; linux-mmc@xxxxxxxxxxxxxxx > Subject: Re: [PATCH] mmc: omap_hsmmc: set dto to 14 for all devices > > Hi Chase, > > On Thu, Mar 01 2012, Chase Maupin wrote: > > * With certain SD cards timeouts like the following have been > seen > > due to an improper calculation of the dto value: > > mmcblk0: error -110 transferring data, sector 4126233, nr 8, > > card status 0xc00 > > * By removing the dto calculation and setting the timeout value > > to the maximum specified by the SD card specification part A2 > > section 2.2.15 these timeouts can be avoided. > > * This change has been used by beagleboard users as well as the > > Texas Instruments SDK without a negative impact. > > * There are multiple discussion threads about this but the most > > relevant ones are: > > * http://talk.maemo.org/showthread.php?p=1000707#post1000707 > > * http://www.mail-archive.com/linux- > omap@xxxxxxxxxxxxxxx/msg42213.html > > * Original proposal for this fix was done by Sukumar Ghoral of > > Texas Instruments > > > > * Tested using a Texas Instruments AM335x EVM > > > > Signed-off-by: Chase Maupin <Chase.Maupin@xxxxxx> > > Thanks, I've pushed this to mmc-next for 3.4. (With a trivial > indentation fix, below.) Thank you Chris. > > diff --git a/drivers/mmc/host/omap_hsmmc.c > b/drivers/mmc/host/omap_hsmmc.c > index 82b400793..9d4ce1c 100644 > --- a/drivers/mmc/host/omap_hsmmc.c > +++ b/drivers/mmc/host/omap_hsmmc.c > @@ -1360,7 +1360,7 @@ static void set_data_timeout(struct > omap_hsmmc_host *host) > if (clkd == 0) > clkd = 1; > > - /* Use the maximum timeout value allowed in the standard of 14 > or 0xE */ > + /* Use the maximum timeout value allowed in the standard of > 14 or 0xE */ > dto = 14; > > reg &= ~DTO_MASK; > > > - Chris. > -- > Chris Ball <cjb@xxxxxxxxxx> <http://printf.net/> > One Laptop Per Child -- To unsubscribe from this list: send the line "unsubscribe linux-omap" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
