This is a note to let you know that I've just added the patch titled
mmc: core: Do a power cycle when the CMD11 fails
to the 5.12-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
mmc-core-do-a-power-cycle-when-the-cmd11-fails.patch
and it can be found in the queue-5.12 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 147186f531ae49c18b7a9091a2c40e83b3d95649 Mon Sep 17 00:00:00 2001
From: DooHyun Hwang <dh0421.hwang@xxxxxxxxxxx>
Date: Wed, 10 Feb 2021 13:59:36 +0900
Subject: mmc: core: Do a power cycle when the CMD11 fails
From: DooHyun Hwang <dh0421.hwang@xxxxxxxxxxx>
commit 147186f531ae49c18b7a9091a2c40e83b3d95649 upstream.
A CMD11 is sent to the SD/SDIO card to start the voltage switch procedure
into 1.8V I/O. According to the SD spec a power cycle is needed of the
card, if it turns out that the CMD11 fails. Let's fix this, to allow a
retry of the initialization without the voltage switch, to succeed.
Note that, whether it makes sense to also retry with the voltage switch
after the power cycle is a bit more difficult to know. At this point, we
treat it like the CMD11 isn't supported and therefore we skip it when
retrying.
Signed-off-by: DooHyun Hwang <dh0421.hwang@xxxxxxxxxxx>
Link: https://lore.kernel.org/r/20210210045936.7809-1-dh0421.hwang@xxxxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -1207,7 +1207,7 @@ int mmc_set_uhs_voltage(struct mmc_host
err = mmc_wait_for_cmd(host, &cmd, 0);
if (err)
- return err;
+ goto power_cycle;
if (!mmc_host_is_spi(host) && (cmd.resp[0] & R1_ERROR))
return -EIO;
Patches currently in stable-queue which might be from dh0421.hwang@xxxxxxxxxxx are
queue-5.12/mmc-core-do-a-power-cycle-when-the-cmd11-fails.patch
