linux-kernel - [PATCH 5.19 079/155] mmc: core: Fix inconsistent sd3_bus

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Date:   Tue,  6 Sep 2022 15:30:27 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Seunghui Lee <sh043.lee@...sung.com>,
        Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>
Subject: [PATCH 5.19 079/155] mmc: core: Fix inconsistent sd3_bus_mode at UHS-I SD voltage switch failure

From: Adrian Hunter <adrian.hunter@...el.com>

commit 63f1560930e4e1c4f6279b8ae715c9841fe1a6d3 upstream.

If re-initialization results is a different signal voltage, because the
voltage switch failed previously, but not this time (or vice versa), then
sd3_bus_mode will be inconsistent with the card because the SD_SWITCH
command is done only upon first initialization.

Fix by always reading SD_SWITCH information during re-initialization, which
also means it does not need to be re-read later for the 1.8V fixup
workaround.

Note, brief testing showed SD_SWITCH took about 1.8ms to 2ms which added
about 1% to 1.5% to the re-initialization time, so it's not particularly
significant.

Reported-by: Seunghui Lee <sh043.lee@...sung.com>
Signed-off-by: Adrian Hunter <adrian.hunter@...el.com>
Reviewed-by: Seunghui Lee <sh043.lee@...sung.com>
Tested-by: Seunghui Lee <sh043.lee@...sung.com>
Cc: stable@...r.kernel.org
Link: https://lore.kernel.org/r/20220815073321.63382-3-adrian.hunter@intel.com
Signed-off-by: Ulf Hansson <ulf.hansson@...aro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 drivers/mmc/core/sd.c |   42 ++++++++++++++++--------------------------
 1 file changed, 16 insertions(+), 26 deletions(-)

--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -949,16 +949,17 @@ int mmc_sd_setup_card(struct mmc_host *h
 
 		/* Erase init depends on CSD and SSR */
 		mmc_init_erase(card);
-
-		/*
-		 * Fetch switch information from card.
-		 */
-		err = mmc_read_switch(card);
-		if (err)
-			return err;
 	}
 
 	/*
+	 * Fetch switch information from card. Note, sd3_bus_mode can change if
+	 * voltage switch outcome changes, so do this always.
+	 */
+	err = mmc_read_switch(card);
+	if (err)
+		return err;
+
+	/*
 	 * For SPI, enable CRC as appropriate.
 	 * This CRC enable is located AFTER the reading of the
 	 * card registers because some SDHC cards are not able
@@ -1480,26 +1481,15 @@ retry:
 	if (!v18_fixup_failed && !mmc_host_is_spi(host) && mmc_host_uhs(host) &&
 	    mmc_sd_card_using_v18(card) &&
 	    host->ios.signal_voltage != MMC_SIGNAL_VOLTAGE_180) {
-		/*
-		 * Re-read switch information in case it has changed since
-		 * oldcard was initialized.
-		 */
-		if (oldcard) {
-			err = mmc_read_switch(card);
-			if (err)
-				goto free_card;
-		}
-		if (mmc_sd_card_using_v18(card)) {
-			if (mmc_host_set_uhs_voltage(host) ||
-			    mmc_sd_init_uhs_card(card)) {
-				v18_fixup_failed = true;
-				mmc_power_cycle(host, ocr);
-				if (!oldcard)
-					mmc_remove_card(card);
-				goto retry;
-			}
-			goto cont;
+		if (mmc_host_set_uhs_voltage(host) ||
+		    mmc_sd_init_uhs_card(card)) {
+			v18_fixup_failed = true;
+			mmc_power_cycle(host, ocr);
+			if (!oldcard)
+				mmc_remove_card(card);
+			goto retry;
 		}
+		goto cont;
 	}
 
 	/* Initialization sequence for UHS-I cards */