From: Ziyuan Xu Date: Tue, 17 Jan 2017 01:22:56 +0000 (+0800) Subject: mmc: dw_mmc: force setup bus if active slots exist X-Git-Tag: v4.14-rc1~1637^2 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=e9748e0364fe82dc037d22900ff13a62d04518bf;p=platform%2Fkernel%2Flinux-rpi.git 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: Reported-by: Randy Li Reported-by: S. Gilles Signed-off-by: Ziyuan Xu Signed-off-by: Shawn Lin Signed-off-by: Ulf Hansson --- diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index b44306b..73db085 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 */