diff options
Diffstat (limited to 'drivers/mmc/core/mmc.c')
| -rw-r--r-- | drivers/mmc/core/mmc.c | 25 |
1 files changed, 23 insertions, 2 deletions
diff --git a/drivers/mmc/core/mmc.c b/drivers/mmc/core/mmc.c index 13074aa1f605..838726b68ff3 100644 --- a/drivers/mmc/core/mmc.c +++ b/drivers/mmc/core/mmc.c @@ -28,6 +28,7 @@ #define DEFAULT_CMD6_TIMEOUT_MS 500 #define MIN_CACHE_EN_TIMEOUT_MS 1600 +#define CACHE_FLUSH_TIMEOUT_MS 30000 /* 30s */ static const unsigned int tran_exp[] = { 10000, 100000, 1000000, 10000000, @@ -2036,6 +2037,25 @@ static bool _mmc_cache_enabled(struct mmc_host *host) host->card->ext_csd.cache_ctrl & 1; } +/* + * Flush the internal cache of the eMMC to non-volatile storage. + */ +static int _mmc_flush_cache(struct mmc_host *host) +{ + int err = 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); + } + + return err; +} + static int _mmc_suspend(struct mmc_host *host, bool is_suspend) { int err = 0; @@ -2047,7 +2067,7 @@ static int _mmc_suspend(struct mmc_host *host, bool is_suspend) if (mmc_card_suspended(host->card)) goto out; - err = mmc_flush_cache(host->card); + err = _mmc_flush_cache(host); if (err) goto out; @@ -2188,7 +2208,7 @@ static int _mmc_hw_reset(struct mmc_host *host) * In the case of recovery, we can't expect flushing the cache to work * always, but we have a go and ignore errors. */ - mmc_flush_cache(host->card); + _mmc_flush_cache(host); if ((host->caps & MMC_CAP_HW_RESET) && host->ops->hw_reset && mmc_can_reset(card)) { @@ -2216,6 +2236,7 @@ static const struct mmc_bus_ops mmc_ops = { .shutdown = mmc_shutdown, .hw_reset = _mmc_hw_reset, .cache_enabled = _mmc_cache_enabled, + .flush_cache = _mmc_flush_cache, }; /* |