On Mar 2, 2011, at 9:48 PM, Priyanka Jain wrote: > - Timeout counter value is set as DTOCV bits in SYSCTL register > For counter value set as timeout, > Timeout period = (2^(timeout + 13)) SD Clock cycles > > - As per 4.6.2.2 section of SD Card specification v2.00, host should > cofigure timeout period value to minimum 0.25 sec. > > - Number of SD Clock cycles for 0.25sec should be minimum > (SD Clock/sec * 0.25 sec) SD Clock cycles > = (mmc->tran_speed * 1/4) SD Clock cycles > > - Calculating timeout based on > (2^(timeout + 13)) >= mmc->tran_speed * 1/4 > Taking log2 both the sides and rounding up to next power of 2 > => timeout + 13 = log2(mmc->tran_speed/4) + 1 > > Signed-off-by: Priyanka Jain <[email protected]> > Signed-off-by: Andy Fleming <[email protected]> > Signed-off-by: Kumar Gala <[email protected]> > Acked-by: Mingkai Hu <[email protected]> > --- > Changes for v3: > Including code changes of v1 as suggested by Stefano Babic > > Changes for v2: > Added proper description as suggested by Wolfgang Denk > > drivers/mmc/fsl_esdhc.c | 16 +++++++++++++++- > 1 files changed, 15 insertions(+), 1 deletions(-)
Stefano, Got a chance to test on imx? Would like this fix in v2011.03 - k _______________________________________________ U-Boot mailing list [email protected] http://lists.denx.de/mailman/listinfo/u-boot
