From: Ziyuan Xu <xzy.xu@xxxxxxxxxxxxxx> 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@xxxxxxxxxxxxxxx> Reported-by: Randy Li <randy.li@xxxxxxxxxxxxxx> Reported-by: S. Gilles <sgilles@xxxxxxxxxxxx> Signed-off-by: Ziyuan Xu <xzy.xu@xxxxxxxxxxxxxx> Signed-off-by: Shawn Lin <shawn.lin@xxxxxxxxxxxxxx> --- Changes in v6: - reuse force_clkinit Changes in v5: - rebase in order to skip spamming log Changes in v4: - update commit message - fix SD host rpm resume can't work Changes in v3: - only reset host with active slot. Changes in v2: - update the commit message - use dw_mci_reset instead of dw_mci_ctrl_reset drivers/mmc/host/dw_mmc.c | 7 ++++--- 1 file changed, 4 insertions(+), 3 deletions(-) diff --git a/drivers/mmc/host/dw_mmc.c b/drivers/mmc/host/dw_mmc.c index 972c779..a9ac0b4 100644 --- a/drivers/mmc/host/dw_mmc.c +++ b/drivers/mmc/host/dw_mmc.c @@ -3366,10 +3366,11 @@ 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 */ -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe stable" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html