mmc: core: Add SD card quirk for broken discard

Some SD-cards from Sandisk that are SDA-6.0 compliant reports they supports
discard, while they actually don't. This might cause mk2fs to fail while
trying to format the card and revert it to a read-only mode.

To fix this problem, let's add a card quirk (MMC_QUIRK_BROKEN_SD_DISCARD)
to indicate that we shall fall-back to use the legacy erase command
instead.

Signed-off-by: Avri Altman <[email protected]>
Cc: [email protected]
Link: https://lore.kernel.org/r/[email protected]
[Ulf: Updated the commit message]
Signed-off-by: Ulf Hansson <[email protected]>

Author: avri-altman-sndk

drivers/mmc/core/block.c

@@ -1140,8 +1140,12 @@ static void mmc_blk_issue_discard_rq(struct mmc_queue *mq, struct request *req)
 {
 	struct mmc_blk_data *md = mq->blkdata;
 	struct mmc_card *card = md->queue.card;
+	unsigned int arg = card->erase_arg;
 
-	mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, card->erase_arg);
+	if (mmc_card_broken_sd_discard(card))
+		arg = SD_ERASE_ARG;
+
+	mmc_blk_issue_erase_rq(mq, req, MMC_BLK_DISCARD, arg);
 }
 
 static void mmc_blk_issue_secdiscard_rq(struct mmc_queue *mq,

drivers/mmc/core/card.h

@@ -73,6 +73,7 @@ struct mmc_fixup {
 #define EXT_CSD_REV_ANY (-1u)
 
 #define CID_MANFID_SANDISK      0x2
+#define CID_MANFID_SANDISK_SD   0x3
 #define CID_MANFID_ATP          0x9
 #define CID_MANFID_TOSHIBA      0x11
 #define CID_MANFID_MICRON       0x13
@@ -258,4 +259,9 @@ static inline int mmc_card_broken_hpi(const struct mmc_card *c)
 	return c->quirks & MMC_QUIRK_BROKEN_HPI;
 }
 
+static inline int mmc_card_broken_sd_discard(const struct mmc_card *c)
+{
+	return c->quirks & MMC_QUIRK_BROKEN_SD_DISCARD;
+}
+
 #endif

drivers/mmc/core/quirks.h

@@ -100,6 +100,12 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
 	MMC_FIXUP("V10016", CID_MANFID_KINGSTON, CID_OEMID_ANY, add_quirk_mmc,
 		  MMC_QUIRK_TRIM_BROKEN),
 
+	/*
+	 * Some SD cards reports discard support while they don't
+	 */
+	MMC_FIXUP(CID_NAME_ANY, CID_MANFID_SANDISK_SD, 0x5344, add_quirk_sd,
+		  MMC_QUIRK_BROKEN_SD_DISCARD),
+
 	END_FIXUP
 };
 

include/linux/mmc/card.h

@@ -293,6 +293,7 @@ struct mmc_card {
 #define MMC_QUIRK_BROKEN_IRQ_POLLING	(1<<11)	/* Polling SDIO_CCCR_INTx could create a fake interrupt */
 #define MMC_QUIRK_TRIM_BROKEN	(1<<12)		/* Skip trim */
 #define MMC_QUIRK_BROKEN_HPI	(1<<13)		/* Disable broken HPI support */
+#define MMC_QUIRK_BROKEN_SD_DISCARD	(1<<14)	/* Disable broken SD discard support */
 
 	bool			reenable_cmdq;	/* Re-enable Command Queue */