[PATCH] mmc: core: disable TRIM on Kingston EMMC04G-M627

[Robert Marko]

It seems that Kingston EMMC04G-M627 despite advertising TRIM support does
not work when the core is trying to use REQ_OP_WRITE_ZEROES.

We are seeing I/O errors in OpenWrt under 6.1 on Zyxel NBG7815 that we did
not previously have and tracked it down to REQ_OP_WRITE_ZEROES.

Trying to use fstrim seems to also throw errors like:
[93010.835112] I/O error, dev loop0, sector 16902 op 0x3:(DISCARD) flags 0x800 phys_seg 1 prio class 2

Disabling TRIM makes the error go away, so lets add a quirk for this eMMC
to disable TRIM.

Signed-off-by: Robert Marko <robimarko@xxxxxxxxx>
---
 drivers/mmc/core/quirks.h | 7 +++++++
 1 file changed, 7 insertions(+)

diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index 77caa0c903f8..8decb788a3db 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -107,6 +107,13 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
 	MMC_FIXUP("Q2J54A", CID_MANFID_MICRON, 0x014e, add_quirk_mmc,
 		  MMC_QUIRK_TRIM_BROKEN),
 
+	/*
+	 * Kingston EMMC04G-M627 advertises TRIM but it does not seems to
+	 * support being used to offload WRITE_ZEROES.
+	 */
+	MMC_FIXUP("M62704", CID_MANFID_KINGSTON, 0x0100, add_quirk_mmc,
+		  MMC_QUIRK_TRIM_BROKEN),
+
 	/*
 	 * Some SD cards reports discard support while they don't
 	 */
-- 
2.41.0