The patch below was submitted to be applied to the 4.9-stable tree.
I fail to see how this patch meets the stable kernel rules as found at
Documentation/process/stable_kernel_rules.rst.
I could be totally wrong, and if so, please respond to
<stable@xxxxxxxxxxxxxxx> and let me know why this patch should be
applied. Otherwise, it is now dropped from my patch queues, never to be
seen again.
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From e9748e0364fe82dc037d22900ff13a62d04518bf Mon Sep 17 00:00:00 2001
From: Ziyuan Xu <xzy.xu@xxxxxxxxxxxxxx>
Date: Tue, 17 Jan 2017 09:22:56 +0800
Subject: [PATCH] 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@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>
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
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 */
--
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