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