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openwrt/target/linux/bcm27xx/patches-6.12/950-0442-drivers-mmc-disable-write-caching-on-Samsung-2023-mo.patch
2025-07-12 16:47:58 +02:00

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From de8f7d8e588b7e263d8028f2593cf167947eab37 Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
Date: Mon, 8 Apr 2024 16:09:52 +0100
Subject: [PATCH] drivers: mmc: disable write-caching on Samsung 2023 model
year SD cards
Samsung EVO Plus, Pro Plus and Evo Ultimate cards of this era appear to
have a broken cache-flush implementation when operating in CQ mode.
Unfortunately the cards seem to use a separate CID name string for every
variant and capacity, so nobble the cache feature for this MANFID, OEMID
and year. Turning this off seems to have negligible impact on
random-write throughput in non-CQ mode.
Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
---
drivers/mmc/core/card.h | 1 +
drivers/mmc/core/quirks.h | 8 ++++++++
2 files changed, 9 insertions(+)
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -88,6 +88,7 @@ struct mmc_fixup {
#define CID_MANFID_GIGASTONE 0x12
#define CID_MANFID_MICRON 0x13
#define CID_MANFID_SAMSUNG 0x15
+#define CID_MANFID_SAMSUNG_SD 0x1b
#define CID_MANFID_APACER 0x27
#define CID_MANFID_SWISSBIT 0x5D
#define CID_MANFID_KINGSTON 0x70
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -58,6 +58,14 @@ static const struct mmc_fixup __maybe_un
MMC_FIXUP("SD32G", 0x41, 0x3432, add_quirk, MMC_QUIRK_ERASE_BROKEN),
MMC_FIXUP("SD64G", 0x41, 0x3432, add_quirk, MMC_QUIRK_ERASE_BROKEN),
+ /*
+ * Samsung Pro Plus/EVO Plus/Pro Ultimate SD cards (2023) claim to cache
+ * flush OK, but become unresponsive afterwards.
+ */
+ _FIXUP_EXT(CID_NAME_ANY, CID_MANFID_SAMSUNG_SD, 0x534d, 2023, CID_MONTH_ANY,
+ 0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
+ MMC_QUIRK_BROKEN_SD_CACHE, EXT_CSD_REV_ANY),
+
END_FIXUP
};