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| author |   David S. Miller <davem@sunset.davemloft.net> | 2005-12-14 16:21:48 -0800 |
|---|---|---|
| committer | David S. Miller <davem@sunset.davemloft.net> | 2005-12-14 16:21:48 -0800 |
| commit | 28247644cc07b54a798d997631d01531f2d9acfd (patch) | |
| tree | a4cffdcacd92504b23045cdea60f8c4aa45dd466 /drivers | |
| parent | [GRE]: Fix hardware checksum modification (diff) | |
| parent | Merge master.kernel.org:/home/rmk/linux-2.6-arm (diff) | |
| download | linux-dev-28247644cc07b54a798d997631d01531f2d9acfd.tar.xz linux-dev-28247644cc07b54a798d997631d01531f2d9acfd.zip | |
Merge master.kernel.org:/pub/scm/linux/kernel/git/torvalds/linux-2.6
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/mmc/mmc.c | 10 |
1 files changed, 9 insertions, 1 deletions
diff --git a/drivers/mmc/mmc.c b/drivers/mmc/mmc.c index b586a83a9b4c..eb41391e06e9 100644 --- a/drivers/mmc/mmc.c +++ b/drivers/mmc/mmc.c @@ -679,7 +679,15 @@ static void mmc_idle_cards(struct mmc_host *host) } /* - * Apply power to the MMC stack. + * Apply power to the MMC stack. This is a two-stage process. + * First, we enable power to the card without the clock running. + * We then wait a bit for the power to stabilise. Finally, + * enable the bus drivers and clock to the card. + * + * We must _NOT_ enable the clock prior to power stablising. + * + * If a host does all the power sequencing itself, ignore the + * initial MMC_POWER_UP stage. */ static void mmc_power_up(struct mmc_host *host) { |