This is a note to let you know that I've just added the patch titled
mmc: mmci: stm32: clear DLYB_CR after sending tuning command
to the 5.15-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-mmci-stm32-clear-dlyb_cr-after-sending-tuning-command.patch
and it can be found in the queue-5.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From ff31ee0a0f471776f67be5e5275c18d17736fc6b Mon Sep 17 00:00:00 2001
From: Yann Gautier <yann.gautier@xxxxxxxxxxx>
Date: Wed, 15 Dec 2021 15:17:26 +0100
Subject: mmc: mmci: stm32: clear DLYB_CR after sending tuning command
From: Yann Gautier <yann.gautier@xxxxxxxxxxx>
commit ff31ee0a0f471776f67be5e5275c18d17736fc6b upstream.
During test campaign, and especially after several unbind/bind sequences,
it has been seen that the SD-card on SDMMC1 thread could freeze.
The freeze always appear on a CMD23 following a CMD19.
Checking SDMMC internal registers shows that the tuning command (CMD19)
has failed.
The freeze is then due to the delay block involved in the tuning sequence.
To correct this, clear the delay block register DLYB_CR register after
the tuning commands.
Signed-off-by: Christophe Kerello <christophe.kerello@xxxxxxxxxxx>
Signed-off-by: Yann Gautier <yann.gautier@xxxxxxxxxxx>
Reviewed-by: Linus Walleij <linus.walleij@xxxxxxxxxx>
Fixes: 1103f807a3b9 ("mmc: mmci_sdmmc: Add execute tuning with delay block")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20211215141727.4901-4-yann.gautier@xxxxxxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/host/mmci_stm32_sdmmc.c | 2 ++
1 file changed, 2 insertions(+)
--- a/drivers/mmc/host/mmci_stm32_sdmmc.c
+++ b/drivers/mmc/host/mmci_stm32_sdmmc.c
@@ -441,6 +441,8 @@ static int sdmmc_dlyb_phase_tuning(struc
return -EINVAL;
}
+ writel_relaxed(0, dlyb->base + DLYB_CR);
+
phase = end_of_len - max_len / 2;
sdmmc_dlyb_set_cfgr(dlyb, dlyb->unit, phase, false);
Patches currently in stable-queue which might be from yann.gautier@xxxxxxxxxxx are
queue-5.15/mmc-mmci-stm32-clear-dlyb_cr-after-sending-tuning-command.patch
