linux-kernel - [PATCH] mmc: core: disable TRIM on Micron MTFC4GACAJCN-1M

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Message-Id: <20230530213259.1776512-1-robimarko@gmail.com>
Date:   Tue, 30 May 2023 23:32:59 +0200
From:   Robert Marko <robimarko@...il.com>
To:     ulf.hansson@...aro.org, windhl@....com, avri.altman@....com,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Robert Marko <robimarko@...il.com>
Subject: [PATCH] mmc: core: disable TRIM on Micron MTFC4GACAJCN-1M

It seems that Micron MTFC4GACAJCN-1M despite advertising TRIM support does
not work when the core is trying to use REQ_OP_WRITE_ZEROES.

We are seeing the following errors in OpenWrt under 6.1 on Qnap Qhora 301W
that we did not previously have and tracked it down to REQ_OP_WRITE_ZEROES:
[   18.085950] I/O error, dev loop0, sector 596 op 0x9:(WRITE_ZEROES) flags 0x800 phys_seg 0 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@...il.com>
---
 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 29b9497936df..77caa0c903f8 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -100,6 +100,13 @@ 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),
 
+	/*
+	 * Micron MTFC4GACAJCN-1M advertises TRIM but it does not seems to
+	 * support being used to offload WRITE_ZEROES.
+	 */
+	MMC_FIXUP("Q2J54A", CID_MANFID_MICRON, 0x014e, add_quirk_mmc,
+		  MMC_QUIRK_TRIM_BROKEN),
+
 	/*
 	 * Some SD cards reports discard support while they don't
 	 */
-- 
2.40.1