[PATCHv2] mmc: rpmb: add quirk MMC_QUIRK_BROKEN_RPMB_RETUNE

[Jorge Ramirez-Ortiz]

On the eMMC SanDisk iNAND 7250 configured with HS200, requesting a
re-tune before switching to the RPMB partition would randomly cause
subsequent RPMB requests to fail with EILSEQ:
* data error -84, tigggered in __mmc_blk_ioctl_cmd()

This commit skips the retune when switching to RPMB.
Tested over several days with per minute RPMB reads.

Signed-off-by: Jorge Ramirez-Ortiz <jorge@xxxxxxxxxxxx>
---
 Fixes v1: kernel test robot identified typo causing build failure
           CIF_MANFID_SANDISK_SD --> CID_MANFID_SANDISK_SD

 drivers/mmc/core/block.c  | 6 +++++-
 drivers/mmc/core/card.h   | 7 +++++++
 drivers/mmc/core/quirks.h | 7 +++++++
 include/linux/mmc/card.h  | 1 +
 4 files changed, 20 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 152dfe593c43..9b7ba6562a3b 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -860,6 +860,11 @@ static int mmc_blk_part_switch_pre(struct mmc_card *card,
 				return ret;
 		}
 		mmc_retune_pause(card->host);
+
+		/* Do not force retune before RPMB switch */
+		if (mmc_can_retune(card->host) &&
+		    mmc_card_broken_rpmb_retune(card))
+			card->host->need_retune = 0;
 	}

 	return ret;
@@ -3143,4 +3148,3 @@ module_exit(mmc_blk_exit);

 MODULE_LICENSE("GPL");
 MODULE_DESCRIPTION("Multimedia Card (MMC) block device driver");
-
diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index b7754a1b8d97..1e1555a15de9 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -85,6 +85,7 @@ struct mmc_fixup {
 #define CID_MANFID_MICRON       0x13
 #define CID_MANFID_SAMSUNG      0x15
 #define CID_MANFID_APACER       0x27
+#define CID_MANFID_SANDISK2     0x45
 #define CID_MANFID_KINGSTON     0x70
 #define CID_MANFID_HYNIX	0x90
 #define CID_MANFID_KINGSTON_SD	0x9F
@@ -284,4 +285,10 @@ static inline int mmc_card_broken_cache_flush(const struct mmc_card *c)
 {
 	return c->quirks & MMC_QUIRK_BROKEN_CACHE_FLUSH;
 }
+
+static inline int mmc_card_broken_rpmb_retune(const struct mmc_card *c)
+{
+	return c->quirks & MMC_QUIRK_BROKEN_RPMB_RETUNE;
+}
+
 #endif
diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index cca71867bc4a..56c79b6b3537 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -130,6 +130,13 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
 	MMC_FIXUP(CID_NAME_ANY, CID_MANFID_SANDISK_SD, 0x5344, add_quirk_sd,
 		  MMC_QUIRK_BROKEN_SD_DISCARD),

+	/*
+	 * SanDisk iNAND 7250 DG4064, this quirk shall disable the retune
+	 * operation enforced by default when switching to RPMB.
+	 */
+	MMC_FIXUP("DG4064", CID_MANFID_SANDISK2, 0x100, add_quirk_mmc,
+		  MMC_QUIRK_BROKEN_RPMB_RETUNE),
+
 	END_FIXUP
 };

diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index 7b12eebc5586..bd6986189e8b 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -296,6 +296,7 @@ struct mmc_card {
 #define MMC_QUIRK_BROKEN_SD_DISCARD	(1<<14)	/* Disable broken SD discard support */
 #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_RPMB_RETUNE	(1<<17) /* Don't force a retune before switching to RPMB */

 	bool			written_flag;	/* Indicates eMMC has been written since power on */
 	bool			reenable_cmdq;	/* Re-enable Command Queue */
--
2.34.1