summaryrefslogtreecommitdiff
path: root/drivers/mmc
diff options
context:
space:
mode:
authorBean Huo <beanhuo@micron.com>2023-10-30 23:48:09 +0100
committerUlf Hansson <ulf.hansson@linaro.org>2023-11-03 12:01:32 +0100
commited9009ad300c0f15a3ecfe9613547b1962bde02c (patch)
tree3b0ec79698eca6b61635daf60762763f86d47992 /drivers/mmc
parent71956d0cb56c1e5f9feeb4819db87a076418e930 (diff)
mmc: Add quirk MMC_QUIRK_BROKEN_CACHE_FLUSH for Micron eMMC Q2J54A
Micron MTFC4GACAJCN eMMC supports cache but requires that flush cache operation be allowed only after a write has occurred. Otherwise, the cache flush command or subsequent commands will time out. Signed-off-by: Bean Huo <beanhuo@micron.com> Signed-off-by: Rafael Beims <rafael.beims@toradex.com> Cc: stable@vger.kernel.org Link: https://lore.kernel.org/r/20231030224809.59245-1-beanhuo@iokpp.de Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Diffstat (limited to 'drivers/mmc')
-rw-r--r--drivers/mmc/core/block.c4
-rw-r--r--drivers/mmc/core/card.h4
-rw-r--r--drivers/mmc/core/mmc.c8
-rw-r--r--drivers/mmc/core/quirks.h7
4 files changed, 17 insertions, 6 deletions
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 3a8f27c3e310..152dfe593c43 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -2381,8 +2381,10 @@ enum mmc_issued mmc_blk_mq_issue_rq(struct mmc_queue *mq, struct request *req)
}
ret = mmc_blk_cqe_issue_flush(mq, req);
break;
- case REQ_OP_READ:
case REQ_OP_WRITE:
+ card->written_flag = true;
+ fallthrough;
+ case REQ_OP_READ:
if (host->cqe_enabled)
ret = mmc_blk_cqe_issue_rw_rq(mq, req);
else
diff --git a/drivers/mmc/core/card.h b/drivers/mmc/core/card.h
index 4edf9057fa79..b7754a1b8d97 100644
--- a/drivers/mmc/core/card.h
+++ b/drivers/mmc/core/card.h
@@ -280,4 +280,8 @@ static inline int mmc_card_broken_sd_cache(const struct mmc_card *c)
return c->quirks & MMC_QUIRK_BROKEN_SD_CACHE;
}
+static inline int mmc_card_broken_cache_flush(const struct mmc_card *c)
+{
+ return c->quirks & MMC_QUIRK_BROKEN_CACHE_FLUSH;
+}
#endif
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c
index 8180983bd402..8ec19f9f1fd2 100644
--- a/drivers/mmc/core/mmc.c
+++ b/drivers/mmc/core/mmc.c
@@ -2086,13 +2086,17 @@ static int _mmc_flush_cache(struct mmc_host *host)
{
int err = 0;
+ if (mmc_card_broken_cache_flush(host->card) && !host->card->written_flag)
+ return 0;
+
if (_mmc_cache_enabled(host)) {
err = mmc_switch(host->card, EXT_CSD_CMD_SET_NORMAL,
EXT_CSD_FLUSH_CACHE, 1,
CACHE_FLUSH_TIMEOUT_MS);
if (err)
- pr_err("%s: cache flush error %d\n",
- mmc_hostname(host), err);
+ pr_err("%s: cache flush error %d\n", mmc_hostname(host), err);
+ else
+ host->card->written_flag = false;
}
return err;
diff --git a/drivers/mmc/core/quirks.h b/drivers/mmc/core/quirks.h
index 32b64b564fb1..cca71867bc4a 100644
--- a/drivers/mmc/core/quirks.h
+++ b/drivers/mmc/core/quirks.h
@@ -110,11 +110,12 @@ static const struct mmc_fixup __maybe_unused mmc_blk_fixups[] = {
MMC_QUIRK_TRIM_BROKEN),
/*
- * Micron MTFC4GACAJCN-1M advertises TRIM but it does not seems to
- * support being used to offload WRITE_ZEROES.
+ * Micron MTFC4GACAJCN-1M supports TRIM but does not appear to support
+ * WRITE_ZEROES offloading. It also supports caching, but the cache can
+ * only be flushed after a write has occurred.
*/
MMC_FIXUP("Q2J54A", CID_MANFID_MICRON, 0x014e, add_quirk_mmc,
- MMC_QUIRK_TRIM_BROKEN),
+ MMC_QUIRK_TRIM_BROKEN | MMC_QUIRK_BROKEN_CACHE_FLUSH),
/*
* Kingston EMMC04G-M627 advertises TRIM but it does not seems to