This is a note to let you know that I've just added the patch titled
mmc: core: sdio: hold retuning if sdio in 1-bit mode
to the 5.4-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-sdio-hold-retuning-if-sdio-in-1-bit-mode.patch
and it can be found in the queue-5.4 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 32a9cdb8869dc111a0c96cf8e1762be9684af15b Mon Sep 17 00:00:00 2001
From: Haibo Chen <haibo.chen@xxxxxxx>
Date: Wed, 30 Aug 2023 17:39:22 +0800
Subject: mmc: core: sdio: hold retuning if sdio in 1-bit mode
From: Haibo Chen <haibo.chen@xxxxxxx>
commit 32a9cdb8869dc111a0c96cf8e1762be9684af15b upstream.
tuning only support in 4-bit mode or 8 bit mode, so in 1-bit mode,
need to hold retuning.
Find this issue when use manual tuning method on imx93. When system
resume back, SDIO WIFI try to switch back to 4 bit mode, first will
trigger retuning, and all tuning command failed.
Signed-off-by: Haibo Chen <haibo.chen@xxxxxxx>
Acked-by: Adrian Hunter <adrian.hunter@xxxxxxxxx>
Fixes: dfa13ebbe334 ("mmc: host: Add facility to support re-tuning")
Cc: stable@xxxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20230830093922.3095850-1-haibo.chen@xxxxxxx
Signed-off-by: Ulf Hansson <ulf.hansson@xxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/mmc/core/sdio.c | 8 +++++++-
1 file changed, 7 insertions(+), 1 deletion(-)
--- a/drivers/mmc/core/sdio.c
+++ b/drivers/mmc/core/sdio.c
@@ -1014,8 +1014,14 @@ static int mmc_sdio_resume(struct mmc_ho
}
err = mmc_sdio_reinit_card(host);
} else if (mmc_card_wake_sdio_irq(host)) {
- /* We may have switched to 1-bit mode during suspend */
+ /*
+ * We may have switched to 1-bit mode during suspend,
+ * need to hold retuning, because tuning only supprt
+ * 4-bit mode or 8 bit mode.
+ */
+ mmc_retune_hold_now(host);
err = sdio_enable_4bit_bus(host->card);
+ mmc_retune_release(host);
}
if (err)
Patches currently in stable-queue which might be from haibo.chen@xxxxxxx are
queue-5.4/mmc-core-sdio-hold-retuning-if-sdio-in-1-bit-mode.patch
