mirrors
/
linux-stable
mirror of https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
1
0
Fork 0
Code Issues Releases Wiki Activity

mmc: core: sdio: hold retuning if sdio in 1-bit mode 

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@nxp.com>
Acked-by: Adrian Hunter <adrian.hunter@intel.com>
Fixes: dfa13ebbe3 ("mmc: host: Add facility to support re-tuning")
Cc: stable@vger.kernel.org
Link: https://lore.kernel.org/r/20230830093922.3095850-1-haibo.chen@nxp.com
Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
This commit is contained in:
Haibo Chen 2023-08-30 17:39:22 +08:00 committed by Ulf Hansson
parent 1bbac8d6af
commit 32a9cdb886
1 changed files with 7 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

8
drivers/mmc/core/sdio.c
View File

@ -1089,8 +1089,14 @@ static int mmc_sdio_resume(struct mmc_host *host)
}
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)