From 43730828eca754b4b527d79fc5a1d3ff50c50481 Mon Sep 17 00:00:00 2001 From: Jonathan Bell Date: Mon, 8 Apr 2024 16:09:52 +0100 Subject: [PATCH 1019/1085] 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 --- 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 @@ -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 --- a/drivers/mmc/core/quirks.h +++ b/drivers/mmc/core/quirks.h @@ -25,6 +25,14 @@ static const struct mmc_fixup __maybe_un 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 };