On Feb 24, 2011, at 2:53 AM, Kumar Gala wrote: > From: Priyanka Jain <priyanka.j...@freescale.com> > > - Timeout counter value is set as DTOCV bits in SYSCTL register > For counter value set as x, > Timeout period = (2^(13+x))/SD_CLOCK > > - As per 4.6.2.2 section of SD Card specification v2.00, host should > cofigure timeout period value to minimum 250 msec. > > - SD_CLOCK = mmc->trans_speed > > - Calculating x based on > 250 msec = (2^(13+x))/mmc->trans_speed > > Signed-off-by: Priyanka Jain <priyanka.j...@freescale.com> > Signed-off-by: Andy Fleming <aflem...@freescale.com> > Signed-off-by: Kumar Gala <ga...@kernel.crashing.org> > --- > drivers/mmc/fsl_esdhc.c | 5 ++++- > 1 files changed, 4 insertions(+), 1 deletions(-)
Stefano, Can you test this on iMX to make sure we didnt break anything there. > > diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c > index c6de751..6f8a09d 100644 > --- a/drivers/mmc/fsl_esdhc.c > +++ b/drivers/mmc/fsl_esdhc.c > @@ -210,7 +210,10 @@ static int esdhc_setup_data(struct mmc *mmc, struct > mmc_data *data) > esdhc_write32(®s->blkattr, data->blocks << 16 | data->blocksize); > > /* Calculate the timeout period for data transactions */ > - timeout = fls(mmc->tran_speed/10) - 1; > + /* Timeout period = (2^(13+timeout))/mmc->trans_speed > + * Timeout period should be minimum 250msec as per SD Card spec > + */ > + timeout = fls(mmc->tran_speed/4); > timeout -= 13; > > if (timeout > 14) > -- > 1.7.2.3 > > _______________________________________________ > U-Boot mailing list > U-Boot@lists.denx.de > http://lists.denx.de/mailman/listinfo/u-boot _______________________________________________ U-Boot mailing list U-Boot@lists.denx.de http://lists.denx.de/mailman/listinfo/u-boot
