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/[email protected]/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 <[email protected]>
Thanks, I've pushed this to mmc-next for 3.4. (With a trivial
indentation fix, below.)
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 <[email protected]> <http://printf.net/>
One Laptop Per Child
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