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 at vger.kernel.org>
Reported-by: Randy Li <randy.li at rock-chips.com>
Reported-by: S. Gilles <sgilles at math.umd.edu>
Signed-off-by: Ziyuan Xu <xzy.xu at rock-chips.com>
Signed-off-by: Shawn Lin <shawn.lin at rock-chips.com>
---
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 dc58ec3..0914d53 100644
--- a/drivers/mmc/host/dw_mmc.c
+++ b/drivers/mmc/host/dw_mmc.c
@@ -3367,10 +3367,11 @@ 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, true);
- }
+
+ /* Force setup bus to guarantee available clock output */
+ dw_mci_setup_bus(slot, true, true);
}
/* Now that slots are all setup, we can enable card detect */
--
1.9.1
