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 <[email protected]>
Acked-by: Adrian Hunter <[email protected]>
Fixes: dfa13eb ("mmc: host: Add facility to support re-tuning")
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
Signed-off-by: Ulf Hansson <[email protected]>

Author: Haibo Chen

drivers/mmc/core/sdio.c

@@ -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)