linux-kernel - Re: [RFC PATCH V2 2/2] mmc: allow card to disable tuning

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Message-ID: <20250313163223.1514010-1-erick.shepherd@ni.com>
Date: Thu, 13 Mar 2025 11:32:23 -0500
From: Erick Shepherd <erick.shepherd@...com>
To: <adrian.hunter@...el.com>
CC: <andy-ld.lu@...iatek.com>, <avri.altman@....com>, <cw9316.lee@...sung.com>,
        <dsimic@...jaro.org>, <erick.shepherd@...com>, <keita.aihara@...y.com>,
        <linux-kernel@...r.kernel.org>, <linux-mmc@...r.kernel.org>,
        <quic_jjohnson@...cinc.com>, <ricardo@...liere.net>,
        <ulf.hansson@...aro.org>, <victor.shih@...esyslogic.com.tw>,
        <wsa+renesas@...g-engineering.com>
Subject: Re: [RFC PATCH V2 2/2] mmc: allow card to disable tuning

How does this look? I confirmed the changes stop the card from tuning
and prevent the I/O errors. I can submit a new patch since these
changes are substantially different than my initial ones.

diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index 3205feb1e8ff..756f80024635 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -89,6 +89,7 @@ struct mmc_fixup {
 #define CID_MANFID_MICRON       0x13
 #define CID_MANFID_SAMSUNG      0x15
 #define CID_MANFID_APACER       0x27
+#define CID_MANFID_SWISSBIT     0x5D
 #define CID_MANFID_KINGSTON     0x70
 #define CID_MANFID_HYNIX	0x90
 #define CID_MANFID_KINGSTON_SD	0x9F


diff --git a/drivers/mmc/core/core.c b/drivers/mmc/core/core.c
index 5241528f8b90..8962992f05aa 100644
--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -937,6 +937,10 @@ int mmc_execute_tuning(struct mmc_card *card)
 	if (!host->ops->execute_tuning)
 		return 0;
 
+	if ((card->quirks & MMC_QUIRK_NO_UHS_DDR50_TUNING) &&
+	    host->ios.timing == MMC_TIMING_UHS_DDR50)
+		return 0;
+
 	if (host->cqe_on)
 		host->cqe_ops->cqe_off(host);

 
diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index 89b512905be1..7f893bafaa60 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -34,6 +34,16 @@ static const struct mmc_fixup __maybe_unused mmc_sd_fixups[] = {
 		   MMC_QUIRK_BROKEN_SD_CACHE | MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY,
 		   EXT_CSD_REV_ANY),
 
+	/*
+	 * Swissbit series S46-u cards throw I/O errors during tuning requests
+	 * after the initial tuning request expectedly times out. This has
+	 * only been observed on cards manufactured on 01/2019 that are using
+	 * Bay Trail host controllers.
+	 */
+	_FIXUP_EXT("0016G", CID_MANFID_SWISSBIT, 0x5342, 2019, 1,
+		   0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
+		   MMC_QUIRK_NO_UHS_DDR50_TUNING, EXT_CSD_REV_ANY),
+
 	END_FIXUP
 };

 
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 526fce581657..ddcdf23d731c 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -329,6 +329,7 @@ struct mmc_card {
 #define MMC_QUIRK_BROKEN_SD_CACHE	(1<<15)	/* Disable broken SD cache support */
 #define MMC_QUIRK_BROKEN_CACHE_FLUSH	(1<<16)	/* Don't flush cache until the write has occurred */
 #define MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY	(1<<17) /* Disable broken SD poweroff notify support */
+#define MMC_QUIRK_NO_UHS_DDR50_TUNING	(1<<18) /* Disable DDR50 tuning */
 
 	bool			written_flag;	/* Indicates eMMC has been written since power on */
 	bool			reenable_cmdq;	/* Re-enable Command Queue */
-- 

Regards,
Erick