openwrt/target/linux/bcm27xx/patches-6.6/950-1019-drivers-mmc-disable-write-caching-on-Samsung-2023-mo.patch

From 43730828eca754b4b527d79fc5a1d3ff50c50481 Mon Sep 17 00:00:00 2001
From: Jonathan Bell <jonathan@raspberrypi.com>
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 <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
@@ -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
 };