[PATCH 4.9 07/25] mmc: core: Specify timeouts for BKOPS and CACHE_FLUSH for eMMC

Greg Kroah-Hartman
2022-05-23T17:05:20Z

From: Ulf Hansson <ulf.hansson@linaro.org>

commit 24ed3bd01d6a844fd5e8a75f48d0a3d10ed71bf9 upstream

The timeout values used while waiting for a CMD6 for BKOPS or a CACHE_FLUSH
to complete, are not defined by the eMMC spec. However, a timeout of 10
minutes as is currently being used, is just silly for both of these cases.
Instead, let's specify more reasonable timeouts, 120s for BKOPS and 30s for
CACHE_FLUSH.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Link: https://lore.kernel.org/r/20200122142747.5690-2-ulf.hansson@linaro.org
Signed-off-by: Kamal Dasu <kdasu.kdev@gmail.com>
[kamal: Drop mmc_run_bkops hunk, non-existent]
Signed-off-by: Florian Fainelli <f.fainelli@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---
drivers/mmc/core/core.c | 5 ++++-
1 file changed, 4 insertions(+), 1 deletion(-)

--- a/drivers/mmc/core/core.c
+++ b/drivers/mmc/core/core.c
@@ -61,6 +61,8 @@
/* The max erase timeout, used when host->max_busy_timeout isn't specified */
#define MMC_ERASE_TIMEOUT_MS (60 * 1000) /* 60 s */

+#define MMC_CACHE_FLUSH_TIMEOUT_MS (30 * 1000) /* 30s */
+
static const unsigned freqs[] = { 400000, 300000, 200000, 100000 };

/*
@@ -2936,7 +2938,8 @@ int mmc_flush_cache(struct mmc_card *car
(card->ext_csd.cache_size > 0) &&
(card->ext_csd.cache_ctrl & 1)) {
err = mmc_switch(card, EXT_CSD_CMD_SET_NORMAL,
- EXT_CSD_FLUSH_CACHE, 1, 0);
+ EXT_CSD_FLUSH_CACHE, 1,
+ MMC_CACHE_FLUSH_TIMEOUT_MS);
if (err)
pr_err("%s: cache flush error %d\n",
mmc_hostname(card->host), err);