From: Avri Altman <avri.altman@wdc.com>
To: Ulf Hansson <ulf.hansson@linaro.org>,
linux-mmc@vger.kernel.org,
Adrian Hunter <adrian.hunter@intel.com>
Cc: linux-kernel@vger.kernel.org, Avri Altman <avri.altman@wdc.com>
Subject: [PATCH v2 2/2] mmc: block: Update ext_csd.cache_ctrl if it was written
Date: Sun, 18 Apr 2021 08:59:53 +0300 [thread overview]
Message-ID: <20210418055953.26959-3-avri.altman@wdc.com> (raw)
In-Reply-To: <20210418055953.26959-1-avri.altman@wdc.com>
The cache function can be turned ON and OFF by writing to the CACHE_CTRL
byte (EXT_CSD byte [33]). However, card->ext_csd.cache_ctrl is only
set on init if cache size > 0.
Fix that by explicitly setting ext_csd.cache_ctrl on ext-csd write.
Signed-off-by: Avri Altman <avri.altman@wdc.com>
---
drivers/mmc/core/block.c | 12 ++++++++++++
1 file changed, 12 insertions(+)
diff --git a/drivers/mmc/core/block.c b/drivers/mmc/core/block.c
index 6800feb70c92..0372702231ce 100644
--- a/drivers/mmc/core/block.c
+++ b/drivers/mmc/core/block.c
@@ -572,6 +572,18 @@ static int __mmc_blk_ioctl_cmd(struct mmc_card *card, struct mmc_blk_data *md,
main_md->part_curr = value & EXT_CSD_PART_CONFIG_ACC_MASK;
}
+ /*
+ * Make sure to update CACHE_CTRL in case it was changed. The cache
+ * will get turned back on if the card is re-initialized, e.g.
+ * suspend/resume or hw reset in recovery.
+ */
+ if ((MMC_EXTRACT_INDEX_FROM_ARG(cmd.arg) == EXT_CSD_CACHE_CTRL) &&
+ (cmd.opcode == MMC_SWITCH)) {
+ u8 value = MMC_EXTRACT_VALUE_FROM_ARG(cmd.arg) & 1;
+
+ card->ext_csd.cache_ctrl = value;
+ }
+
/*
* According to the SD specs, some commands require a delay after
* issuing the command.
--
2.25.1
prev parent reply other threads:[~2021-04-18 6:00 UTC|newest]
Thread overview: 6+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-04-18 5:59 [PATCH v2 0/2] Do not flush cache when it is disabled Avri Altman
2021-04-18 5:59 ` [PATCH v2 1/2] mmc: block: Issue flush only if allowed Avri Altman
2021-04-19 12:39 ` Ulf Hansson
2021-04-19 12:47 ` Avri Altman
2021-04-19 12:48 ` Avri Altman
2021-04-18 5:59 ` Avri Altman [this message]
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