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drivers: mmc: disable write-caching on Samsung 2023 model year SD cards

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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>
This commit is contained in:
Jonathan Bell
2024-04-08 16:09:52 +01:00
committed by Dom Cobley
parent 9c4360965d
commit d3e4a07724
2 changed files with 9 additions and 0 deletions
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1
drivers/mmc/core/card.h
View File

@@ -84,6 +84,7 @@ struct mmc_fixup {
#define CID_MANFID_TOSHIBA 0x11
#define CID_MANFID_MICRON 0x13
#define CID_MANFID_SAMSUNG 0x15
#define CID_MANFID_SAMSUNG_SD 0x1b
#define CID_MANFID_APACER 0x27
#define CID_MANFID_KINGSTON 0x70
#define CID_MANFID_HYNIX 0x90

8
drivers/mmc/core/quirks.h
View File

@@ -25,6 +25,14 @@ 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),
/*
* 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
};