diff options
| author | Ziyuan Xu <xzy.xu@rock-chips.com> | 2017-01-17 09:22:56 +0800 |
|---|---|---|
| committer | Ulf Hansson <ulf.hansson@linaro.org> | 2017-01-23 10:19:30 +0100 |
| commit | e9748e0364fe82dc037d22900ff13a62d04518bf (patch) | |
| tree | 09c9b72e50f007ef59a19beb173bad5eabb398db /drivers/mmc/host/dw_mmc.c | |
| parent | 7a308bb3016f57e5be11a677d15b821536419d36 (diff) | |
| download | linux-e9748e0364fe82dc037d22900ff13a62d04518bf.tar.bz2 | |
mmc: dw_mmc: force setup bus if active slots exist
It's necessary to setup bus if any slots are present.
- update clock after ctrl reset
- if the host has genpd node, we can guarantee the clock is
available before starting request. Otherwies, the clock register
is reset once power off the pd, and host can't output the active
clock during communication.
Fixes: e9ed8835e990 ("mmc: dw_mmc: add runtime PM callback")
Fixes: df9bcc2bc0a1 ("mmc: dw_mmc: add missing codes for runtime resume")
cc: <stable@vger.kernel.org>
Reported-by: Randy Li <randy.li@rock-chips.com>
Reported-by: S. Gilles <sgilles@math.umd.edu>
Signed-off-by: Ziyuan Xu <xzy.xu@rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin@rock-chips.com>
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc/host/dw_mmc.c')
| -rw-r--r-- | drivers/mmc/host/dw_mmc.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index b44306b886cb..73db08558e4d 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3354,10 +3354,11 @@ int dw_mci_runtime_resume(struct device *dev) if (!slot) continue; - if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) { + if (slot->mmc->pm_flags & MMC_PM_KEEP_POWER) dw_mci_set_ios(slot->mmc, &slot->mmc->ios); - dw_mci_setup_bus(slot, true); - } + + /* Force setup bus to guarantee available clock output */ + dw_mci_setup_bus(slot, true); } /* Now that slots are all setup, we can enable card detect */ |