diff options
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/fsl_esdhc.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/drivers/mmc/fsl_esdhc.c b/drivers/mmc/fsl_esdhc.c index d649626..5863774 100644 --- a/drivers/mmc/fsl_esdhc.c +++ b/drivers/mmc/fsl_esdhc.c @@ -221,16 +221,16 @@ static int esdhc_setup_data(struct mmc *mmc, struct mmc_data *data) * 2)Timeout period should be minimum 0.250sec as per SD Card spec * So, 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 + * = (mmc->clock * 1/4) SD Clock cycles * As 1) >= 2) - * => (2^(timeout+13)) >= mmc->tran_speed * 1/4 + * => (2^(timeout+13)) >= mmc->clock * 1/4 * Taking log2 both the sides - * => timeout + 13 >= log2(mmc->tran_speed/4) + * => timeout + 13 >= log2(mmc->clock/4) * Rounding up to next power of 2 - * => timeout + 13 = log2(mmc->tran_speed/4) + 1 - * => timeout + 13 = fls(mmc->tran_speed/4) + * => timeout + 13 = log2(mmc->clock/4) + 1 + * => timeout + 13 = fls(mmc->clock/4) */ - timeout = fls(mmc->tran_speed/4); + timeout = fls(mmc->clock/4); timeout -= 13; if (timeout > 14) |