git.openwrt.org Git - openwrt/staging/ldir.git/blob

   1 From 43730828eca754b4b527d79fc5a1d3ff50c50481 Mon Sep 17 00:00:00 2001
   2 From: Jonathan Bell <jonathan@raspberrypi.com>
   3 Date: Mon, 8 Apr 2024 16:09:52 +0100
   4 Subject: [PATCH 1019/1085] drivers: mmc: disable write-caching on Samsung 2023
   5  model year SD cards
   6
   7 Samsung EVO Plus, Pro Plus and Evo Ultimate cards of this era appear to
   8 have a broken cache-flush implementation when operating in CQ mode.
   9
  10 Unfortunately the cards seem to use a separate CID name string for every
  11 variant and capacity, so nobble the cache feature for this MANFID, OEMID
  12 and year. Turning this off seems to have negligible impact on
  13 random-write throughput in non-CQ mode.
  14
  15 Signed-off-by: Jonathan Bell <jonathan@raspberrypi.com>
  16 ---
  17  drivers/mmc/core/card.h   | 1 +
  18  drivers/mmc/core/quirks.h | 8 ++++++++
  19  2 files changed, 9 insertions(+)
  20
  21 --- a/drivers/mmc/core/card.h
  22 +++ b/drivers/mmc/core/card.h
  23 @@ -84,6 +84,7 @@ struct mmc_fixup {
  24  #define CID_MANFID_TOSHIBA      0x11
  25  #define CID_MANFID_MICRON       0x13
  26  #define CID_MANFID_SAMSUNG      0x15
  27 +#define CID_MANFID_SAMSUNG_SD  0x1b
  28  #define CID_MANFID_APACER       0x27
  29  #define CID_MANFID_KINGSTON     0x70
  30  #define CID_MANFID_HYNIX       0x90
  31 --- a/drivers/mmc/core/quirks.h
  32 +++ b/drivers/mmc/core/quirks.h
  33 @@ -25,6 +25,14 @@ static const struct mmc_fixup __maybe_un
  34                    0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
  35                    MMC_QUIRK_BROKEN_SD_CACHE, EXT_CSD_REV_ANY),
  36
  37 +       /*
  38 +        * Samsung Pro Plus/EVO Plus/Pro Ultimate SD cards (2023) claim to cache
  39 +        * flush OK, but become unresponsive afterwards.
  40 +        */
  41 +       _FIXUP_EXT(CID_NAME_ANY, CID_MANFID_SAMSUNG_SD, 0x534d, 2023, CID_MONTH_ANY,
  42 +                  0, -1ull, SDIO_ANY_ID, SDIO_ANY_ID, add_quirk_sd,
  43 +                  MMC_QUIRK_BROKEN_SD_CACHE, EXT_CSD_REV_ANY),
  44 +
  45         END_FIXUP
  46  };
  47