This is a note to let you know that I've just added the patch titled
mmc: core: Fix partition switch time for eMMC
to the 4.4-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-fix-partition-switch-time-for-emmc.patch
and it can be found in the queue-4.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 66fbacccbab91e6e55d9c8f1fc0910a8eb6c81f7 Mon Sep 17 00:00:00 2001
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Date: Wed, 3 Mar 2021 11:26:14 +0200
Subject: mmc: core: Fix partition switch time for eMMC
From: Adrian Hunter <adrian.hunter@xxxxxxxxx>
commit 66fbacccbab91e6e55d9c8f1fc0910a8eb6c81f7 upstream.
Avoid the following warning by always defining partition switch time:
[ 3.209874] mmc1: unspecified timeout for CMD6 - use generic
[ 3.222780] ------------[ cut here ]------------
[ 3.233363] WARNING: CPU: 1 PID: 111 at drivers/mmc/core/mmc_ops.c:575 __mmc_switch+0x200/0x204
Reported-by: Paul Fertser <fercerpav@xxxxxxxxx>
Fixes: 1c447116d017 ("mmc: mmc: Fix partition switch timeout for some eMMCs")
Signed-off-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Link: https://lore.kernel.org/r/168bbfd6-0c5b-5ace-ab41-402e7937c46e@xxxxxxxxx
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/mmc.c | 15 +++++++++++----
1 file changed, 11 insertions(+), 4 deletions(-)
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -400,10 +400,6 @@ static int mmc_decode_ext_csd(struct mmc
/* EXT_CSD value is in units of 10ms, but we store in ms */
card->ext_csd.part_time = 10 * ext_csd[EXT_CSD_PART_SWITCH_TIME];
- /* Some eMMC set the value too low so set a minimum */
- if (card->ext_csd.part_time &&
- card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
- card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
/* Sleep / awake timeout in 100ns units */
if (sa_shift > 0 && sa_shift <= 0x17)
@@ -585,6 +581,17 @@ static int mmc_decode_ext_csd(struct mmc
card->ext_csd.data_sector_size = 512;
}
+ /*
+ * GENERIC_CMD6_TIME is to be used "unless a specific timeout is defined
+ * when accessing a specific field", so use it here if there is no
+ * PARTITION_SWITCH_TIME.
+ */
+ if (!card->ext_csd.part_time)
+ card->ext_csd.part_time = card->ext_csd.generic_cmd6_time;
+ /* Some eMMC set the value too low so set a minimum */
+ if (card->ext_csd.part_time < MMC_MIN_PART_SWITCH_TIME)
+ card->ext_csd.part_time = MMC_MIN_PART_SWITCH_TIME;
+
/* eMMC v5 or later */
if (card->ext_csd.rev >= 7) {
memcpy(card->ext_csd.fwrev, &ext_csd[EXT_CSD_FIRMWARE_VERSION],
Patches currently in stable-queue which might be from adrian.hunter@xxxxxxxxx are
queue-4.4/mmc-core-fix-partition-switch-time-for-emmc.patch
