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Commit 894b678d authored by Haibo Chen's avatar Haibo Chen Committed by Greg Kroah-Hartman
Browse files

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



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: default avatarHaibo Chen <haibo.chen@nxp.com>
Acked-by: default avatarAdrian Hunter <adrian.hunter@intel.com>
Fixes: dfa13ebb ("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: default avatarUlf Hansson <ulf.hansson@linaro.org>
Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
parent 37ae7c49

drivers/mmc/core/sdio.c

+7 −1
Original line number Diff line number Diff line
@@ -1014,8 +1014,14 @@ 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)