[RFC PATCH] mmc: core: Add SD card quirk for broken poweroff notification

[Keita Aihara]

GIGASTONE Gaming Plus microSD cards manufactured on 02/2022 report that
they support poweroff notification and cache, but they are not working
correctly.

Flush Cache bit never gets cleared in sd_flush_cache() and Poweroff
Notification Ready bit also never gets set to 1 within 1 second from the
end of busy of CMD49 in sd_poweroff_notify().

This leads to I/O error and runtime PM error state.

I observed that the same card manufactured on 01/2024 works as expected.

This problem seems similar to the Kingston cards fixed with
commit c467c8f08185 ("mmc: Add MMC_QUIRK_BROKEN_SD_CACHE for Kingston
Canvas Go Plus from 11/2019") and should be handled using quirks.

CID for the problematic card is here.
12345641535443002000000145016200

Manufacturer ID is 0x12 and defined as CID_MANFID_GIGASTONE as of now,
but would like comments on what naming is appropriate because MID list
is not public and not sure it's right.

Signed-off-by: Keita Aihara <keita.aihara@xxxxxxxx>
---
 drivers/mmc/core/card.h   | 7 +++++++
 drivers/mmc/core/quirks.h | 9 +++++++++
 drivers/mmc/core/sd.c     | 2 +-
 include/linux/mmc/card.h  | 1 +
 4 files changed, 18 insertions(+), 1 deletion(-)

diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index b7754a1b8d97..8476754b1b17 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -82,6 +82,7 @@ struct mmc_fixup {
 #define CID_MANFID_SANDISK_SD   0x3
 #define CID_MANFID_ATP          0x9
 #define CID_MANFID_TOSHIBA      0x11
+#define CID_MANFID_GIGASTONE    0x12
 #define CID_MANFID_MICRON       0x13
 #define CID_MANFID_SAMSUNG      0x15
 #define CID_MANFID_APACER       0x27
@@ -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_sd_poweroff_notify(const struct mmc_card *c)
+{
+	return c->quirks & MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY;
+}
+
 #endif
diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index 92905fc46436..89b512905be1 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -25,6 +25,15 @@ static const struct mmc_fixup __maybe_unused mmc_sd_fixups[] = {
 		   0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
 		   MMC_QUIRK_BROKEN_SD_CACHE, EXT_CSD_REV_ANY),
 
+	/*
+	 * GIGASTONE Gaming Plus microSD cards manufactured on 02/2022 never
+	 * clear Flush Cache bit and set Poweroff Notification Ready bit.
+	 */
+	_FIXUP_EXT("ASTC", CID_MANFID_GIGASTONE, 0x3456, 2022, 2,
+		   0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
+		   MMC_QUIRK_BROKEN_SD_CACHE | MMC_QUIRK_BROKEN_SD_POWEROFF_NOTIFY,
+		   EXT_CSD_REV_ANY),
+
 	END_FIXUP
 };
 
diff --git a/drivers/mmc/core/sd.c b/drivers/mmc/core/sd.c
index ee37ad14e79e..0ec550ad5651 100644
--- a/drivers/mmc/core/sd.c
+++ b/drivers/mmc/core/sd.c
@@ -1118,7 +1118,7 @@ static int sd_parse_ext_reg_power(struct mmc_card *card, u8 fno, u8 page,
 	card->ext_power.rev = reg_buf[0] & 0xf;
 
 	/* Power Off Notification support at bit 4. */
-	if (reg_buf[1] & BIT(4))
+	if ((reg_buf[1] & BIT(4)) && !mmc_card_broken_sd_poweroff_notify(card))
 		card->ext_power.feature_support |= SD_EXT_POWER_OFF_NOTIFY;
 
 	/* Power Sustenance support at bit 5. */
diff --git a/include/linux/mmc/card.h b/include/linux/mmc/card.h
index f34407cc2788..543446392776 100644
--- a/include/linux/mmc/card.h
+++ b/include/linux/mmc/card.h
@@ -294,6 +294,7 @@ 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_SD_POWEROFF_NOTIFY	(1<<17) /* Disable broken SD poweroff notify support */
 
 	bool			written_flag;	/* Indicates eMMC has been written since power on */
 	bool			reenable_cmdq;	/* Re-enable Command Queue */
-- 
2.46.0